Bell System Circuit Descriptions (CDs and BTs)

Special thanks to the Seattle Connections Museum and John Novack!

Note: Dates, when known, are the most recent in each document package. CDs generally map to SDs. BTs often map to ES, ST, or T diagrams.

Section Date Issue Size Title Included App/Dwg

CD-1A107-01 5D 1.71 MB Electronic Switching Systems - No. 1 - Arranged with 2-Wire and Data Features - Trunk Switching Circuit Iss 5D Dwg 16D; App 1B Dwg 17B
CD-1A110-01 5B 243.05 KB Electronic Switching Systems - Common Junctor Circuit Iss 5B Dwg 6B; App 1D Dwg 7D; App 2D Dwg 8D; App 3B Dwg 9B; App 4D Dwg 10D
CD-1A140-01 1D 33.61 KB Electronic Switching Systems - No. 1 - Line Insulation Test - Detector Circuit Iss 1D Dwg 3D
CD-1A145-01 1A 176.97 KB Electronic Switching Systems - No. 1 - Loop-Around-Test Circuit Iss 1A Dwg 2A; App 1D Dwg 3D
CD-1A151-01 2A 778.84 KB Electronic Switching Systems - No. 1 - "TOUCH-TONE" Detector - Test Circuit Iss 2A Dwg 5A; App 1B Dwg 6B; App 2D Dwg 7D; App 3AR Dwg 8AR
CD-1A153-01 7B 406.42 KB Electronic Switching Systems - Common - Test Circuit for Ringing and Coin Control Circuits Iss 7B Dwg 19B; App 1B Dwg 20B
CD-1A199-01 2AC 1.66 MB Electronic Switching Systems - No. 1 or 2 Arranged with 2-Wire Features - "TOUCH-TONE" Station Test Circuit Iss 2AC Dwg 12AC; App 1B Dwg 13B; App 2B Dwg 14B; App 3A Dwg 15A
CD-1A210-01 7D 588.30 KB Electronic Switching Systems - Common - Remote Master Scanner Applique Circuit Iss 7D Dwg 11D; App 1B Dwg 12B; App 2D Dwg 13D; App 3D Dwg 14D
CD-1A246-01 3B 590.22 KB Electronic Switching Systems - Common - MF Receiver Circuit Iss 3B Dwg 8B; App 1D Dwg 9D; App 2B Dwg 10B
CD-1A277-01 2AC 1.03 MB Electronic Switching Systems - Common - Dial Tone Delay Alarm Circuit Iss 2AC Dwg 5AC; App 1D Dwg 6D; App 2D Dwg 7D; App 3D Dwg 8D
CD-1A277-01 3B 321.73 KB Electronic Switching Systems - Common - Dial Tone Delay Alarm Circuit Iss 3B Dwg 10B; App 1D Dwg 11D
CD-1A481-01 1 329.32 KB Electronic Switching Systems - Common - 3A Auxiliary Processor/Peripheral Data Storage Processor (PDSP) Circuit - Application Schematic App 1D Dwg 2D; App 2AC Dwg 3AC
CD-1C240-02 4B 1.59 MB Common Systems - Signaling - Application Schematic and Bay Wiring for FU( ) Plus Auxiliary Units for Use in the F Signaling System Iss 4B Dwg 7B; App 1B Dwg 8B; App 2B Dwg 9B; App 3B Dwg 10B
CD-1C297-01 9B 2.22 MB Common Systems - Coin Station Test Line Circuit for Use with SXS, No. 1 Crossbar, No. 5 Crossbar, Panel, ESS No. 1 and ESS No. 2 Systems Iss 9B Dwg 19B; App 1B Dwg 20B
CD-1C375-01 2B 1.33 MB Common Systems - Voice Frequency Transmission - Consolidated Dual F-Signaling and Optional Maintenance Connector Circuit with 4W VF Patch Jacks Iss 2B Dwg 13B
CD-1C454-01 2A 1.62 MB Common Systems - Voice Frequency Transmission - Switched Maintenance Access System No. 3A, 3B, 3C and No. 5( ) - Type 2 and 2B Maintenance Connector Circuit and Type 2BX Cord Access Maintenance Connector Circuit Iss 2A Dwg 2A; App 1B Dwg 3B; App 2B Dwg 4B; App 3B Dwg 5B; App 4AC Dwg 6AC; App 5D Dwg 7D; App 6D Dwg 8D
CD-1C605-01 2B 973.97 KB Common Systems - Voice Frequency Transmission - Switched Maintenance Access System No. 3A, 3B, and 3C - Type 3 Maintenance Connector Iss 2B Dwg 2B; App 1A Dwg 3A; App 2D Dwg 4D; App 3D Dwg 5D
CD-1C605-02 1 1.01 MB Common Systems - Voice Frequency Transmission - Switched Maintenance Access System No. 3A, 3B, and 3C and No. 5( ) - Type 3 Maintenance Connector Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D
CD-1C900-01 1 1.73 MB Common System - 3A Central Control Circuit Iss 1 Dwg 1; App 1A Dwg 2A; App 2A Dwg 3A; App 3A Dwg 4A; App 4A Dwg 5A; App 5D Dwg 6D; App 6D Dwg 7D
CD-1C901-01 2D 1.27 MB Common Systems - 3A CC Control Panel Circuit Iss 2D Dwg 2D; App 1AR Dwg 3AR; App 2D Dwg 4D
CD-1C902-03 1 3.56 MB Common Systems - Main Store Controller and Memory Circuit Iss 1 Dwg 1
CD-1C903-02 1 892.68 KB Common Systems - Main Store Memory Circuit Iss 1 Dwg 1; App 1D Dwg 2D
CD-1C904-01 2AC 1022.04 KB Common Systems - Tape Data Controller Circuit Iss 2AC Dwg 5AC
CD-1C905-01 3A 2.16 MB Common Systems - Teletypewriter Controller Unit Circuit Iss 3A Dwg 4A; App 1AC Dwg 5AC; App 2A Dwg 6A; App 3AC Dwg 7AC
CD-1C906-01 2A 918.08 KB Common Systems - System Status Panel Circuit Iss 2A Dwg 2A; App 1A Dwg 3A; App 2D Dwg 4D; App 3B Dwg 5B
CD-1C907-01 2A 1.94 MB Common Systems - System Status Panel Controller Circuit Iss 2A Dwg 2A; App 1A Dwg 3A; App 2A Dwg 4A; App 3D Dwg 5D
CD-1C908-01 2A 933.93 KB Common Systems - System Status Panel Relay Circuit Iss 2A Dwg 2A
CD-1C909-01 2A 1.20 MB Common Systems - Maintenance Frame Power Circuit Iss 2A Dwg 2A; App 1A Dwg 3A; App 2A Dwg 4A; App 3B Dwg 5B
CD-1C910-02 1 2.16 MB Common Systems - Processor Frame Circuit Arranged for No. 2B or 3 ESS Iss 1 Dwg 1; App 10B Dwg 11B; App 1A Dwg 2A; App 2D Dwg 3D; App 3B Dwg 4B; App 4A Dwg 5A; App 5D Dwg 6D; App 6B Dwg 7B; App 7B Dwg 8B; App 8A Dwg 9A; App 9B Dwg 10B
CD-1C911-02 1 1.39 MB Common Systems - Processor Frame Power Circuit Iss 1 Dwg 1
CD-1C912-01 3B 980.10 KB Common Systems - Maintenance Frame Circuit Arranged for ESS No. 2B and 3 Iss 3B Dwg 11B; App 1B Dwg 12B; App 2BU Dwg 13BU; App 3B Dwg 14B; App 4B Dwg 15B
CD-1C913-01 2A 1.70 MB Common Systems - Electronic Remreed Pulser Circuit Iss 2A Dwg 2A; App 1A Dwg 3A; App 2AR Dwg 4AR; App 3AC Dwg 5AC; App 4A Dwg 6A; App 5A Dwg 7A
CD-1D243-01 3B1 1.40 MB Data Systems - Station - Data Set 202T Type - 39A1 Data Mounting and 40B1 Data Mounting Iss 3B1 Dwg 6B1
CD-1D295-01 2A 392.28 KB Data Systems - Station - 63 and 64 Type Data Mountings Iss 2A Dwg 2A; App 1B Dwg 3B; App 2A Dwg 4A; App 3B Dwg 5B
CD-1E046-01 1 2.55 MB PBX Systems - No. 551A, B, 552B, D, E, 555, 556A, 605A, 608A, B, D - Manual PBX Access Line with E and M Lead Signaling Iss 1 Dwg 1; App 1A Dwg 2A; App 2B Dwg 3B; App 3B Dwg 4B
CD-1E054-01 3B 485.44 KB PBX Systems - Interface Circuit - "TOUCH-TONE" Calling to Dial Pulse Conversion Iss 3B Dwg 6B; App 1B Dwg 7B; App 2B Dwg 8B
CD-1H020-01 3D 333.00 KB Electronic Switching Systems - No. 101 - Tone Generators Circuit for Switch Unit Iss 3D Dwg I6D; App 1D Dwg 7D
CD-1H021-01 2D 440.50 KB Electronic Switching Systems - No. 101 - Data Link Transfer Circuit for Switch Unit Iss 2D Dwg 3D; App 1D Dwg 4D
CD-1H022-01 5D 392.78 KB Electronic Switching Systems - No. 101 - Ringing Generator Circuit for Switch Unit Iss 5D Dwg 5D; App 1D Dwg 6D
CD-1P106-01 4B 3.76 MB Operations Support Systems - Common - Switched Maintenance Access System No. 5A - Local Test Port and Distribution Circuit Iss 4B Dwg 6B; App 1A Dwg 7A; App 2B Dwg 8B; App 3AC Dwg 9AC
CD-1P107-01 4A 2.53 MB Operations Support Systems - Common - SMAS 5A/B & RTS 5A - Control Circuit Iss 4A Dwg 6A; App 10B Dwg 16B; App 1B Dwg 7B; App 2A Dwg 8A; App 3B Dwg 9B; App 4A Dwg 10A; App 5B Dwg 11B; App 6A Dwg 12A; App 7B Dwg 13B; App 8B Dwg 14B; App 9A Dwg 15A
CD-1P108-01 2A 2.35 MB Operations Support Systems - Common - RTS 5A - Remote Test Port Iss 2A Dwg 3A; App 1B Dwg 4B; App 2D Dwg 5D; App 3A Dwg 6A; App 4D Dwg 7D
CD-1P109-01 3B 1.85 MB Operations Support Systems - Common - Remote Test System 5A - RTS 5A Frame Circuit Iss 3B Dwg 4B; App 1B Dwg 5B; App 2B Dwg 6B; App 3B Dwg 7B; App 4B Dwg 8B; App 5AR Dwg 9AR; App 6B Dwg 10B
CD-1P110-01 1 542.48 KB Operations Support Systems - Common - Switched Maintenance Access System No. 5A - Phantom Maintenance Connector Circuit Iss 1 Dwg 1
CD-1P111-01 1 531.20 KB Operations Support Systems - Common - Switched Maintenance Access System No. 5A - Remote Maintenance Loop Circuit Iss 1 Dwg 1
CD-1P138-01 3B 1.09 MB Operations Support Systems - Maintenance Connector - Application Schematic for Switched Maintenance Access System (SMAS) 3 and 5 Iss 3B Dwg 4B
CD-20127-01 1928-03-20 4D 245.51 KB Panel System - Test Set Circuit - Tripping Relay Adjusting Set for Use in Offices Using AC-DC Ringing Iss 4D Dwg 4D
CD-21349-01 1929-05-20 2AR 282.72 KB Panel System - 2 Wire Recording Completing Trunk Outgoing to Toll Switchboard No. 1 or No. 3 Arranged to Recall the Subscriber Iss 2AR Dwg 2AR
CD-25600-01 1 1.40 MB Crossbar Systems - No. 1 - Recorder Circuit for Use in Offices Arranged for Automatic Message Accounting Iss 1 Dwg 1
CD-25721-01 4D 180.85 KB Crossbar Systems - No. 5 - Coin Supervisory Concentrating Circuit Iss 4D Dwg 12D; App 1B Dwg 13B
CD-25771-01 3AR 848.89 KB Crossbar Systems - No. 5 - Incoming Trunk Test Line Circuit Iss 3AR Dwg 4AR; App 1B Dwg 5B; App 2D Dwg 6D; App 3B Dwg 7B; App 4B Dwg 8B; App 5D Dwg 9D; App 6D Dwg 10D; App 7D Dwg 11D
CD-25805-01 15B 13.64 MB Crossbar Systems - No. 5 - Master Test Frame Connector Ckt Iss 15B Dwg 92B
CD-26026-01 8D 131.95 KB Crossbar Systems - No. 5 - Incoming Register Marker - Connector Circuit - Register Part for DP, MF, RP, and FSP Incoming Registers and CAMA Senders App 4B Dwg 24B
CD-26042-01 4D 421.50 KB Crossbar Systems - No. 5 - Incoming Register Circuit - Multifrequency Iss 4D Dwg 14D; App 1D Dwg 15D; App 2D Dwg 16D; App 3A Dwg 17A; App 4A Dwg 18A; App 6D Dwg 20D; App 7D Dwg 21D; App 8D Dwg 22D; App 9D Dwg 23D
CD-26077-01 3D 679.01 KB Crossbar Systems - No. 5 - Incoming Trunk Circuit With or Without Tandem Completing Repeated Dialing Using By-Link Reverse Battery Supervision Iss 3D Dwg 15D; App 1B Dwg 16B; App 2B Dwg 17B
CD-26136-01 2AR 942.80 KB Crossbar Systems - No. 5 - Incoming Trunk Circuit From Local Test Desk No. 14, 15B or 16 or Local Test Cabinet No. 3 or Office Test Frame Test Circuit - Dial or Multifrequency Pulsing Iss 2AR Dwg 5AR; App 1D Dwg 6D; App 2D Dwg 7D
CD-26382-01 1 548.13 KB Crossbar Systems - No. 3 - Line, Line Switch and Connector Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2D Dwg 3D
CD-26383-01 2D 691.04 KB Crossbar Systems - No. 3 - Trunk Switch and Connector Circuit Iss 2D Dwg 2D
CD-26384-01 1 2.96 MB Crossbar Systems - No. 3 - Marker Circuit Iss 1 Dwg 1; App 1A Dwg 2A; App 2D Dwg 3D; App 3AC Dwg 4AC
CD-26385-01 1 1.98 MB Crossbar Systems - No. 3 - Originating Register Circuit - Dial Pulsing and "TOUCH-TONE" Calling Iss 1 Dwg 1; App 1A Dwg 2A; App 2A Dwg 3A; App 3D Dwg 4D
CD-26386-01 1 2.10 MB Crossbar Systems - No. 3 - Incoming Register Circuit - Multifrequency and Dial Pulsing with Bylink Operation Iss 1 Dwg 1; App 1A Dwg 2A; App 2D Dwg 3D
CD-26387-01 1 2.41 MB Crossbar Systems - No. 3 - Outgoing Sender and Connector Circuit - MF and DP Outpulsing Iss 1 Dwg 1
CD-26388-01 1 661.47 KB Crossbar Systems - No. 3 - Line Number Translator and Conector Circuit Iss 1 Dwg 1; App 1D Dwg 2D
CD-26389-01 1 589.55 KB Crossbar Systems - No. 3 - Master Connector Circuit Iss 1 Dwg 1; App 1D Dwg 2D
CD-26390-01 2D 301.83 KB Common Systems - Voice Alarm and Control Circuit Iss 2D Dwg 2D
CD-26391-01 1 261.75 KB Crossbar Systems - No. 3 - Permanent Signal to Operator Plug-Ended Trunk Circuit - E and M Lead Supervision Iss 1 Dwg 1; App 1D Dwg 2D
CD-26392-01 1 582.73 KB Crossbar Systems - No. 3 - Code 911 Emergency Reporting Service - Plug-Ended Trunk Circuit with Ringdown Signaling Iss 1 Dwg 1; App 1D Dwg 2D
CD-26393-01 1 709.80 KB Crossbar Systems - No. 3 - Alarm Circuit Iss 1 Dwg 1; App 1A Dwg 2A; App 2D Dwg 3D
CD-26394-01 1 479.87 KB Crossbar Systems - No. 3 - Incoming Register Link Circuit - Combined MF, DP and Bylink Operation Iss 1 Dwg 1; App 1D Dwg 2D
CD-26395-01 1 399.36 KB Crossbar Systems - No. 3 - Outgoing Sender Link and Trunk Identifier Circuit Iss 1 Dwg 1; App 1AR Dwg 2AR
CD-26396-01 1 280.78 KB Crossbar Systems - No. 3 - Permanent Signal to Operator Plug-Ended Trunk Circuit - High-Low Supervision Iss 1 Dwg 1
CD-26397-01 2AR 394.94 KB Crossbar Systems - No. 3 - Intraoffice Plug-Ended Trunk Circuit Iss 2AR Dwg 2AR
CD-26398-01 1 322.42 KB Crossbar Systems - No. 3 - Outgoing Plug-Ended Trunk Circuit - Reverse Battery Supervision Iss 1 Dwg 1
CD-26399-01 1 422.91 KB Crossbar Systems - No. 3 - Incoming Plug-Ended Trunk Circuit - Reverse Battery Supervision Iss 1 Dwg 1; App 1B Dwg 2B
CD-26400-01 1 870.06 KB Crossbar Systems - No. 3 - 2-Way Plug-Ended Trunk Circuit for Exchange Use, MF Pulsing - E and M Lead Supervision Iss 1 Dwg 1
CD-26401-01 1 649.21 KB Crossbar Systems - No. 3 - Recording Completing or Special Service Plug-Ended Trunk Circuit - Coin With or Without Non-Coin - High-Low Supervision to Distant Toll Switchboard Iss 1 Dwg 1
CD-26402-01 1 512.92 KB Crossbar Systems - No. 3 - Outgoing Plug-Ended Trunk Circuit - MF Pulsing - Automatic Number Identification - Operator Assistance or Special Toll - High-Low Supervision - Non-Coin Iss 1 Dwg 1
CD-26403-01 1 342.83 KB Crossbar Systems - No. 3 - Intercept Trunk Circuit - Plug-Ended Iss 1 Dwg 1
CD-26404-01 1 618.46 KB Crossbar Systems - No. 3 - Outgoing Intercept Trunk Circuit - Plug-Ended Iss 1 Dwg 1; App 1A Dwg 2A; App 2D Dwg 3D
CD-26405-01 1 224.47 KB Crossbar Systems - No. 3 - Trouble Permanent Signal Overflow Counter Circuit Iss 1 Dwg 1
CD-26406-01 1 329.29 KB Crossbar Systems - No. 3 - Miscellaneous Circuit for All Frames Iss 1 Dwg 1; App 1D Dwg 2D
CD-26407-01 1 387.52 KB Crossbar Systems - No. 3 - Interrupter Circuit - 60 or 120 IPM Iss 1 Dwg 1; App 1A Dwg 2A; App 2D Dwg 3D
CD-26408-01 1 453.26 KB Crossbar Systems - No. 3 - Subscriber Message Register Circuit for Individual or 2-Party Lines Iss 1 Dwg 1
CD-26409-01 1 242.69 KB Crossbar Systems - No. 3 - Auxiliary Coin Line Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3B Dwg 4B
CD-26410-01 1 415.46 KB Crossbar Systems - No. 3 - Incoming Plug-Ended Trunk Circuit - DP or MF Pulsing - Reverse Battery Supervision - In Band Coin Control Iss 1 Dwg 1
CD-26411-01 2D 7.33 MB Crossbar Systems - No. 3 - Test Circuit Iss 2D Dwg 7D; App 1AR Dwg 8AR; App 2B Dwg 9B; App 3AR Dwg 10AR; App 4D Dwg 11D; App 5A Dwg 12A
CD-26413-01 1 339.30 KB Crossbar Systems - No. 3 - Incoming Plug-Ended Trunk Circuit From Local Test Desk No. 14, 15B, or 16 or Local Test Cabinet No. 3 Iss 1 Dwg 1
CD-26414-01 1 193.57 KB Crossbar Systems - No. 3 - Power, Ringing, and Tone Distributing Circuit Iss 1 Dwg 1
CD-26415-01 1 483.69 KB Crossbar Systems - No. 3 - Reverting Call Plug-Ended Trunk Circuit - Superimposed Ringing Iss 1 Dwg 1
CD-26416-01 1 210.67 KB Crossbar Systems - No. 3 - Outgoing Plug-Ended Trunk Circuit to Information Desk or Repair Service Desk - E and M Lead Supervision Iss 1 Dwg 1; App 1D Dwg 2D
CD-26417-01 1 444.02 KB Crossbar Systems - No. 3 - Incoming Plug-Ended Trunk Circuit - DP or MF Pulsing - E and M Lead Supervision Iss 1 Dwg 1; App 1D Dwg 2D
CD-26418-01 1 505.58 KB Crossbar Systems - No. 3 - Incoming Plug-Ended Trunk Circuit Using Bylink - Reverse Battery or E and M Lead Supervision Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D
CD-26419-01 1 443.70 KB Crossbar Systems - No. 3 - Incoming Plug-Ended Trunk Circuit - No Test - Simplex Controlled Ringing - Reverse Battery or E and M Lead Supervision Iss 1 Dwg 1; App 1B Dwg 2B
CD-26420-01 1 578.07 KB Crossbar Systems - No. 3 - Incoming Plug-Ended Trunk Circuit - DP or MF Pulsing - E and M Lead Supervision - In-Band Coin Control Iss 1 Dwg 1; App 1A Dwg 2A; App 2D Dwg 3D
CD-26422-01 1 313.59 KB Crossbar Systems - No. 3 - Outgoing Plug-Ended Trunk Circuit - Dial Pulsing - E and M Lead Supervision Iss 1 Dwg 1
CD-26423-01 1 469.05 KB Crossbar Systems - No. 3 - Outgoing Plug-Ended Trunk Circuit - MF Pulsing - Automatic Number Identification - Operator Assistance or Special Toll - E and M Lead Supervision - Non-Coin Iss 1 Dwg 1; App 1D Dwg 2D
CD-26424-01 1 861.70 KB Crossbar Systems - No. 3 - Outgoing Plug-Ended Trunk Circuit - MF Pulsing - Automatic Number Identification - Multiple Wink or Polar Marginal Coin Signals - High Low Supervision - Coin and Non-Coin Iss 1 Dwg 1; App 1B Dwg 2B
CD-26425-01 1 848.10 KB Crossbar Systems - No. 3 - Outgoing Plug-Ended Trunk Circuit - MF Pulsing - Automatic Number Identification - Operator Assistance or Special Toll - E and M Lead Supervision - Coin and Non-Coin - In-Band or Multiple Wink Coin Control Iss 1 Dwg 1; App 1A Dwg 2A; App 2D Dwg 3D
CD-26426-01 1 656.76 KB Crossbar Systems - No. 3 - Recording Completing or Special Service Plug-Ended Trunk Circuit - E and M Lead Supervision - Coin With or Without Non-Coin Iss 1 Dwg 1; App 1D Dwg 2D; App 2A Dwg 3A
CD-26427-01 1 344.46 KB Crossbar Systems - No. 3 - Recording Completing or Special Service Plug-Ended Trunk Circuit - Non-Coin - High-Low Supervision to Distant Toll Switchboard Iss 1 Dwg 1
CD-26428-01 1 363.67 KB Crossbar Systems - No. 3 - Recording Completing or Special Service Plug-Ended Trunk Circuit - Non-Coin - E and M Lead Supervision Iss 1 Dwg 1; App 1D Dwg 2D
CD-26429-01 2D 1.08 MB Crossbar Systems - No. 3 - 2-Way Operator Office Plug-Ended Trunk Circuit - E and M Lead Supervision - DP or MF Pulsing - Coin or Non-Coin or Non-Coin Only - In-Band Coin Control Iss 2D Dwg 4D; App 1B Dwg 5B
CD-26430-01 1 815.58 KB Crossbar Systems - No. 3 - 2-Way Plug-Ended Trunk Circuit - Dial Pulsing Using Bylink - E&M Lead Supervision Iss 1 Dwg 1; App 1A Dwg 2D; App 2A Dwg 3A
CD-26431-01 1 371.74 KB Crossbar Systems - No. 3 - Auxiliary Line Circuit for Call-Waiting Service Iss 1 Dwg 1
CD-26432-01 1 246.95 KB Crossbar Systems - No. 3 - Outgoing Plug-Ended Trunk Circuit - Repair Service Desk No. 2 - High-Low Supervision Iss 1 Dwg 1
CD-26433-01 1 132.18 KB Crossbar Systems - No. 3 - Outgoing Plug-Ended Trunk Circuit to Information Desk - Loop Supervision Iss 1 Dwg 1
CD-26435-01 2A 320.09 KB Common Systems - 12A Announcement System Iss 2A Dwg 4A; App 1D Dwg 5D
CD-26436-01 3D 202.68 KB Crossbar Systems - No. 3 - Circuit Pack Schematics Iss 3D Dwg 3D; App 1A Dwg 4A
CD-26437-01 1 306.47 KB Crossbar Systems - No. 3 - Traffic and Plant Register Circuit Iss 1 Dwg 1; App 1D Dwg 2D
CD-26439-01 1 239.44 KB Crossbar Systems - No. 3 - Tape Recorder Circuit Iss 1 Dwg 1
CD-26441-01 1 250.44 KB Crossbar Systems - No. 3 - Trouble Record Trunk Circuit Iss 1 Dwg 1
CD-26442-01 1 1.70 MB Crossbar Systems - No. 3 - Alarm Sending Circuit Iss 1 Dwg 1
CD-26443-01 1 290.87 KB Crossbar Systems - No. 3 - Reverting Call Plug-Ended Trunk Circuit for All Negative Ringing Iss 1 Dwg 1
CD-26445-01 1 483.82 KB Crossbar Systems - No. 3 - Outgoing Plug-Ended Trunk for Use With Automatic Intercept Service Iss 1 Dwg 1; App 1D Dwg 2D
CD-26446-01 2D 291.16 KB Crossbar Systems - No. 3 - Outgoing Intercept Plug-Ended Trunk to Announcement Machine for Vacant Code or Special Announcements Iss 2D Dwg 2D
CD-26447-01 1 1.29 MB Crossbar Systems - No. 3 - 2 Way Plug Ended Trunk Circuit - Dial or Multifrequency Pulsing - Reverse Battery Supervision Iss 1 Dwg 1
CD-26448-01 1 1.44 MB Crossbar Systems - No. 3 - 2-Way Plug-Ended Trunk Circuit - Dial Pulsing Using Bylink - Reverse Battery Supervision Iss 1 Dwg 1
CD-26449-01 1 369.27 KB Crossbar Systems - No. 3 - Emergency Reporting Auxiliary Line Circuit Plug-Ended Iss 1 Dwg 1
CD-26450-01 1 222.38 KB Crossbar Systems - No. 3 - Loop and Leak Test Circuit Iss 1 Dwg 1
CD-26451-01 1 487.99 KB Crossbar Systems - No. 3 and 5A - Controlled Ferroresonant Rectifier Circuit - Negative 48V DC, 50 Amp - Automatic Regulation Iss 1 Dwg 1; App 1D Dwg 2D
CD-26454-01 2D 159.30 KB Crossbar Systems - No. 3 and 5A - Positive and Negative 130 Volt Power Plant Circuit - 6 or 12 Amp Capacity (3 or 6 Amp Per Polarity) Using DC to DC Converters Iss 2D Dwg 3D
CD-26458-01 1 28.51 KB Crossbar Systems - No. 3 - Circuit Pack Schematics for Ringing and Tone Circuit Iss 1 Dwg 1
CD-26462-01 1 275.78 KB Crossbar Systems - No. 3 - Free Number Auxiliary Line Plug-Ended Circuit Iss 1 Dwg 1
CD-26465-01 2D 232.20 KB Crossbar Systems - No. 3 - Alarm Transfer and Release Circuit - Plug-Ended Iss 2D Dwg 2D
CD-26467-01 1 33.46 KB Crossbar Systems - No. 3 - Connectorized Cabling Diagram - 200-1200 Line Application App 1D Dwg 2D
CD-26470-01 1 181.84 KB Crossbar Systems - No. 3 - Outgoing Test Trunk Circuit to Local Test Desk No. 14 or 16 or to Local Test Cabinet No. 3 Iss 1 Dwg 1
CD-2A022-01 3AR 296.31 KB Electronic Switching Systems - No. 1 Arranged with 4-Wire Features - Code "102" and "106" Test Trunk Circuit Iss 3AR Dwg 4AR; App 1A Dwg 5A
CD-2H003-01 7A 761.68 KB Electronic Switching Systems - No. 2 Arranged with 2-Wire Features - Circuit Pack Schematics Iss 7A Dwg 25A
CD-2H192-01 1 721.18 KB Electronic Switching Systems - No. 2 Arranged with 2-Wire Features Processor - DC Power Distribution Circuit for Use with No. 2B Iss 1 Dwg 1; App 1A Dwg 2A; App 2D Dwg 3D; App 3D Dwg 4D
CD-2P021-01 2B 2.32 MB Operations Support Systems - Common - E2A Telemetry System - SCC Remote - Application Schematic Iss 2B Dwg 2B; App 1A Dwg 3A
CD-2P077-01 3A 737.21 KB Operations Support Systems - Common - Directly Connected Test Unit Circuit Iss 3A Dwg 3A; App 10AC Dwg 13AC; App 11A Dwg 14A; App 12A Dwg 15A; App 1B Dwg 4B; App 2B Dwg 5B; App 3A Dwg 6A; App 4B Dwg 7B; App 5B Dwg 8B; App 6A Dwg 9A; App 7AC Dwg 10AC; App 8B Dwg 11B; App 9A Dwg 12A
CD-30200-01 5D 390.52 KB Step by Step Systems - No. 1, 350A or 355A - 3 Wire Selector Circuit for Use as a Local or Incoming Selector or as a Repeated Dialing Toll Train Selector Iss 5D Dwg 24D; App 1D Dwg 25D; App 2D Dwg 26D; App 3D Dwg 27D
CD-30200-02 3D 255.22 KB Step by Step Systems - No. 360A - Local or Incoming Selector Circuit Iss 3D Dwg 8D; App 1D Dwg 9D; App 2AR Dwg 10AR; App 3D Dwg 11D
CD-30200-03 3D 272.34 KB Step-by-Step Systems - No. 1 or 350A - Local Selector Circuit Arranged for Sleeve Repeating on Any or All Levels Iss 3D Dwg 4D; App 1D Dwg 5D
CD-30243-01 5D 208.31 KB Step-by-Step Systems - No. 1, 350A, 355A or 35-E-97 - Test Connector Circuit for Use in Testing Subscriber Lines and for Use in Verification Service Iss 5D Dwg 20D; App 1D Dwg 21D; App 2D Dwg 22D
CD-30868-01 8B 1.07 MB Step by Step Systems - No. 1, 350A, 355A or 35E97 - Rotary Out Trunk Switch Circuit - 3 or 4 Wire Arranged for Pre-Selection Iss 8B Dwg 17B; App 1D Dwg 18D
CD-30868-02 2B 770.75 KB Step by Step Systems - No. 1, 350A, 355A or 35-E-97 - Rotary Out Trunk Switch Circuit - 3 or 4 Wire Arranged for Preselection Iss 2B Dwg 6B; App 1B Dwg 7B; App 2B Dwg 8B
CD-30896-01 9D 899.30 KB Step-by-Step Systems - No. 1 or 350A - Traffic Register Circuit Iss 9D Dwg 24D; App 1B Dwg 25B; App 2D Dwg 26D; App 3B Dwg 27B
CD-30903-01 3B 275.55 KB Step by Step Systems - 35-E-97 - Local Connector Circuit - One Ring Generator Connected to Ground or to Battery Iss 3B Dwg 8B
CD-30976-01 4D 809.11 KB Step-by-Step Systems - No. 1, 350A, 355A, 356A or 360A - 3 or 4 Wire Selector Arranged for Peg Count on Cut Thru to Absorb Digits Once Only and/or Repeatedly and to Return Overflow Signal on Specififed Levels - No. 1 or 350A for 2 Party Message Rate Service - No. 355A or 356A Arranged for Timed Release on Permanent Signal Iss 4D Dwg 16D; App 1D Dwg 17D; App 2B Dwg 18B; App 3D Dwg 19D; App 4B Dwg 20B; App 5B Dwg 21B; App 6D Dwg 22D; App 7B Dwg 23B
CD-30978-01 2D 479.18 KB Step by Step Systems - No. 1, 350A, 355A or 356A - Selector-Circuit - Reverting Call 8 Party Semi-Selective Ringing and/or 4 Party Selective or Semi-Selective Ringing Arranged for 2 Digit Operation Iss 2D Dwg 5D; App 1D Dwg 6D; App 2B Dwg 7B; App 3D Dwg 8D; App 4D Dwg 9D; App 5B Dwg 10B
CD-31237-01 4D 842.17 KB Step by Step System - No. 1, 350A or 355A - Test Trunk Ringing Circuit from Local Test Desk No. 14 or Local Test Cabinet No. 3 - Selective Superimposed Ringing Iss 4D Dwg 8D; App 1B Dwg 9B; App 2B Dwg 10B; App 3D Dwg 11D; App 4D Dwg 12D; App 5D Dwg 13D
CD-31337-01 4D 324.59 KB Step by Step Systems - No. 1, 350A or 355A - Intercepting Trunk Circuit from Connector or Toll Train Selector Multiple or From Auxiliary Intercepting Trunk for 8 Pty Tpl Connector Multiple Iss 4D Dwg 14D; App 1D Dwg 15D
CD-31347-01 6D 1.47 MB Traffic Management Systems - Observing Line Circuit for Use in SXS Line Finder Offices for Observing Originating Service on Subscriber Lines and for Observing on Local Selectors at Central Service Observing Desk Iss 6D Dwg 15D; App 1D Dwg 16D; App 2B Dwg 17B; App 3D Dwg 18D; App 4B Dwg 19B; App 5B Dwg 20B; App 6D Dwg 21D
CD-31349-01 4D 700.79 KB Step by Step System - No. 1, 350A or 355A - Test Distributor Control Circuit for Use in Testing Subscriber Lines from Local Test Desk No. 14 Iss 4D Dwg 5D; App 1D Dwg 6D; App 2D Dwg 7D; App 3D Dwg 8D; App 4D Dwg 9D; App 5D Dwg 10D
CD-31401-01 2D 852.87 KB Step-by-Step Systems - No. 1 or 350A - Test Distributor Control Circuit for Use in Testing Subscriber Lines from Local Test Desk No. 14 Arranged for Permanent Signal Tests Iss 2D Dwg 3D; App 1D Dwg 4D; App 2D Dwg 5D; App 3D Dwg 6D; App 4D Dwg 7D; App 5D Dwg 8D; App 6D Dwg 9D; App 7D Dwg 10D
CD-31401-01 3B 513.38 KB Step-by-Step Systems - No. 1, 350A, 355A or 35E97 - Test Distributor Control Circuit for Use in Testing Subscriber Lines from Local Test Desk No. 14 Arranged for Permanent Signal Tests Iss 3B Dwg 12D; App 1D Dwg 13D; App 2D Dwg 14D; App 3D Dwg 15D
CD-31402-01 1 868.34 KB Step-by-Step Systems - No. 1 or 350A - Permanent Signal Test Circuit for Use in Testing Subscriber Lines from Local Test Desk No. 12C or No. 14 Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D; App 4B Dwg 5B; App 5D Dwg 6D; App 6D Dwg 7D
CD-31402-01 2D 621.07 KB Step-by-Step Systems - No. 1, 350A, 355A, or 35E97 - Permanent Signal Test Circuit for Use in Testing Subscriber Linefrom Local Test Desk No. 12C or 14 Iss 2D Dwg 8D
CD-31592-01 9D 994.90 KB Step by Step Systems - No. 1, 350A, 355A, 360A or 35E97 - Coin Trunk Circuit for Use Preceding a First Selector Serving Prepayment Coin Lines Arranged for Delayed Charging and Overtime Charging Iss 9D Dwg 21D; App 1D Dwg 22D; App 2D Dwg 23D; App 3B Dwg 24B
CD-31606-01 10D 911.75 KB Step-by-Step Systems - No. 1 or 350A - 30, 60, 120 IPM Interrupter and Interrupter Alarm Circuit Iss 10D Dwg 24D; App 1D Dwg 25D; App 2D Dwg 26D
CD-31637-01 9AR 1.44 MB Step-by-Step Systems - No. 1 - Test Set Circuit for Testing Local, Toll, and Combination Local and Toll Connectors Iss 9AR Dwg 15AR; App 1D Dwg 16D
CD-31637-02 3D 1.52 MB Step by Step Systems - No. 1 - Test Set Circuit for Testing Local, Toll and Combination Local and Toll Connectors Iss 3D Dwg 6D; App 1D Dwg 7D; App 2D Dwg 8D
CD-31642-01 2B 2.61 MB Step by Step Systems - No. 1, 350A or 355A - Test Line Circuit for Testing Trunks Incoming from Local Office Coin Box Trunks, or Trunk Circuits with Delayed Charge Interval for Operating Subscriber Register Iss 2B Dwg 5B; App 1AR Dwg 6AR; App 2D Dwg 7D
CD-31642-01 3D 671.58 KB Step by Step System - No. 1, 350A, or 355A - Test Line Circuit for Testing Trunks Incoming from Local Office Coin Box Trunks, or Trunk Circuits with Delayed Charge Interval for Operating Subscriber Register Iss 3D Dwg 8D
CD-31674-01 3D 487.49 KB Step by Step Systems - No. 1, 350A, 355A, 360A, 370A or 370B - 2-Way Repeater Circuit - Outgoing-Battery and Ground Pulsing with Loop Supervision - Incoming - Arranged for Pulse Transmission Iss 3D Dwg 9D; App 1B Dwg 10B; App 2D Dwg 11D; App 3D Dwg 12D; App 4D Dwg 13D
CD-31726-01 5B 963.36 KB Step-by-Step Systems - No. 1, 350A, 355A or 35E97 - Incoming Trunk Circuit - E, M and N or E and M Leads Supervision Iss 5B Dwg 12B; App 1D Dwg 13D; App 2D Dwg 14D
CD-31728-01 1 396.12 KB Step by Step System - No. 1, 350A, 355A, or 360A - Busy Line Cut-In Circuit For Completing Emergency Calls Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D
CD-31737-01 5D 589.48 KB Step-by-Step Systems - No. 1, 350A or 355A - Local Connector Circuit - One Ring Iss 5D Dwg 17D; App 1B Dwg 18B; App 2D Dwg 19D; App 3D Dwg 20D
CD-31738-01 7D 640.58 KB Step-by-Step Systems - No. 1, 350A or 355A - Connector Circuit - Local Rotary Hunting - Selective or One Ring Semi-Selective Ringing with or without Arrangement to Cancel Reverse Battery Supervision on Specified Levels Iss 7D Dwg 23D; App 1D Dwg 24D
CD-31739-01 3D 702.25 KB Step-by-Step Systems - No. 1, 350A or 355A - Combination Connector Circuit - One Ring with or without Reverse Battery Supervision Iss 3D Dwg 14D; App 1B Dwg 15B; App 2D Dwg 16D; App 3B Dwg 17B; App 4AR Dwg 18AR; App 5D Dwg 19D
CD-31767-01 3B 383.65 KB Step by Step Systems - No. 1, 350A or 355A - Intercepting Trunk Circuit from Local Selector Multiple Iss 3B Dwg 8B; App 1D Dwg 9D; App 2B Dwg 10B; App 3D Dwg 11D
CD-31771-01 6D 610.11 KB Step-by-Step Systems - No. 1, 350A, 355A, 360A or 35-E-97 - Intercepting Trunk Circuit from Trunk Finder, Connector Bank or Intercepting Trunk, to Trunk to Operator Office - Arranged to Trip Ringing Only During Ringing Interval Iss 6D Dwg 14D
CD-31773-01 2D 447.26 KB Step by Step Systems - No. 1, 350A, 355A or 356A - Test Connector Circuit for Use with Multi Party - One or Two Terminal Per Line Service Iss 2D Dwg 4D; App 1D Dwg 5D; App 2D Dwg 6D; App 3D Dwg 7D; App 4D Dwg 8D; App 5D Dwg 9D; App 6D Dwg 10D; App 7D Dwg 11D
CD-31775-01 11B 578.01 KB Step-by-Step Systems - No. 1, 350A or 355A - 2 Way Trunk Circuit to Manual or Toll Office - Composite Signaling Type B - Incoming to Local Switchtrain Iss 11B Dwg 25B; App 1B Dwg 26B; App 2B Dwg 27B; App 3B Dwg 28B; App 4AC Dwg 29AC; App 5B Dwg 30B
CD-31775-01 8B 961.24 KB Step by Step Systems - No. 1, 350A or 355A - 2 Way Trunk Circuit to Manual or Toll Office - Type B T.B. Supply - Composite Signaling Type B Iss 8B Dwg 17B; App 1D Dwg 18D; App 2B Dwg 19B; App 3B Dwg 20B
CD-31777-01 5D 131.68 KB Step by Step Systems - No. 355A, 356A or 35-E-97 - Subscriber Line Circuit Iss 5D Dwg 28D; App 1B Dwg 29B
CD-31777-01 6D 444.50 KB Step-by-Step Systems - No. 355A, 356A or 35-E-97 - Subscriber Line Circuit Iss 6D Dwg 35D; App 1AC Dwg 36AC; App 2A Dwg 37A
CD-31793-01 7D 549.33 KB Step by Step Systems - No. 1, 350A, 355A, 360A or 35-E-97 - Line or Trunk Finder Circuit - 22 Point Iss 7D Dwg 12D; App 1B Dwg 13B; App 2D Dwg 14D; App 3D Dwg 15D; App 4D Dwg 16D
CD-31795-01 3B 899.01 KB Step-by-Step Systems - No. 1, 350A, 355A, or 360A - Outgoing Trunk Circuit from Selector Multiple - Multiple at Switchboard - Composite Supervision Type B Iss 3B Dwg 7B; App 1D Dwg 8D; App 2D Dwg 9D; App 3D Dwg 10D; App 4D Dwg 11D; App 5D Dwg 12D; App 6B Dwg 13B; App 7B Dwg 14B; App 8D Dwg 15D
CD-31805-01 4D 666.46 KB Step-by-Step Systems - No. 1, 350A or 355A - Local Connector Circuit - 8-Party Terminal Per Station - Semi-Selective Ringing Iss 4D Dwg 13D; App 1B Dwg 14B; App 2D Dwg 15D
CD-31811-01 4B 1.01 MB Step-by-Step Systems - No. 1, 350A or 355A - Combination Connector Circuit - 5 Code for 10 Party Terminal Per Station - Divided Ringing - Arranged for Reverting Calls and for Calling Party Control Iss 4B Dwg 17B; App 1D Dwg 18D; App 2B Dwg 19B; App 3B Dwg 20B; App 4B Dwg 21B
CD-31825-01 2D 450.42 KB Step by Step Systems - No. 1, 350A, 355A or 356A - Tone Interrupter Circuit for Class of Service Tone Iss 2D Dwg 3D; App 1D Dwg 4D; App 2D Dwg 5D; App 3D Dwg 6D; App 4D Dwg 7D
CD-31854-01 1 538.65 KB Step-by-Step System - No. 355A - Auxiliary Line Circuit for Operating Subscriber's Register Iss 1 Dwg 1; App 1D Dwg 1D; App 2D Dwg 3D; App 3D Dwg 4D; App 4D Dwg 5D; App 5D Dwg 6D; App 6D Dwg 7D; App 7D Dwg 8D
CD-31857-01 7D 424.80 KB Step by Step Systems - No. 355A or 35-E-97 - Test Jack and Connector Test Line Circuit Iss 7D Dwg 12D; App 1D Dwg 13D; App 2D Dwg 14D
CD-31859-01 11D 1.52 MB Step by Step Systems - No. 355A, 356A or 35-E-97 - Test Set for Connectors and Selectors Other Than Toll Transmission Selectors and Trunks Except Those with Coin Features Iss 11D Dwg 15D
CD-31861-01 5D 375.17 KB Step-by-Step Systems - No. 1, 350A, 355A, 360A or 35-E-97 - Coin Trunk Timed Release Circuit for Use with Coin Trunks Arranged for Prepay Service Iss 5D Dwg 7D; App 1B Dwg 8B; App 2D Dwg 9D
CD-31867-01 4D 366.57 KB Step-by-Step Systems - No. 1, 350A or 355A - 2-Way Interlocal Trunk Circuit - Composite Signaling Type "B" or Simplex Signaling with Pulse Correction on Incoming Calls Iss 4D Dwg 12D
CD-31868-01 7B 504.38 KB Step-by-Step Systems - No. 355A - Toll Systems - Intertoll Dialing Office - Interrupter Relay Circuit Iss 7B Dwg 18B; App 1D Dwg 19D; App 2B Dwg 20B; App 3B Dwg 21B
CD-31872-01 1 192.93 KB Step by Step System - 355A Dial Office - Trunk Circuit - Vacant Level or Overflow for Local Selectors Iss 1 Dwg 1
CD-31912-01 7D 744.73 KB Step by Step Systems - No. 1, 350A, 355A, 356A or 360A - Cable Protective Device Alarm - Cable Insulation Alarm and Permanent Signal Alarm Circuit Arranged to Operate on a Specified Number of Permanent Signals - PSB and PSL Battery Supply Iss 7D Dwg 20D; App 1D Dwg 21D; App 2B Dwg 22B
CD-31922-01 5D 689.50 KB Step-by-Step Systems - No. 355A or No. 356A - Line Finder Control Ckt. With or Without Mate Operation Iss 5D Dwg 19D
CD-31932-01 1 1.92 MB SXS Systems - No. 350A or 355A - Test Line Circuit for Testing Local or Toll Train for Ringing and Continuity Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3B Dwg 4B; App 4D Dwg 5D; App 5D Dwg 6D
CD-31941-01 2D 228.79 KB Step by Step Systems - No. 1 or 350A with AT - No. 1 with AMA - Miscellaneous Circuit Identifier Frame Iss 2D Dwg 5D
CD-31974-01 5D 523.28 KB Step-by-Step Systems - No. 355A or 35E97 - Miscellaneous Alarm Circuit - Key, Ringing Fuse and Fuse Alarm Circuits for Alarms and Relay Rack Bays Iss 5D Dwg 20D; App 1D Dwg 21D
CD-31975-01 5D 215.64 KB Step by Step Systems - No. 355A, 360A or 35-E-97 - Miscellaneous Alarm Circuit - Prepay Coin Trunk Alarm and Coin Battery Fuse Alarm Iss 5D Dwg 11D; App 1D Dwg 12D
CD-31978-01 4D 286.46 KB Step by Step Systems - No. 355A, 356A, 360A or 35-E-97 - Miscellaneous Alarm Circuit for Message Rate Trunks - Auxiliary Line Circuits - Line and Trunk Finders and Prepayment Coin Box Trunks Iss 4D Dwg 11D; App 1D Dwg 12D; App 2D Dwg 13D; App 3B Dwg 14B; App 4D Dwg 15D
CD-31980-01 11D 1.10 MB Step by Step Systems - No. 355A - Miscellaneous Alarm Circuit - Alarm Control and Sender Circuits Iss 11D Dwg 17D; App 1A Dwg 18A
CD-32000-01 2D 1.21 MB Step-by-Step Systems - No. 355A - 200 Point Line Finder Circuit - 3 Wire Iss 2D Dwg 4D; App 1D Dwg 5D; App 2D Dwg 6D; App 3D Dwg 7D; App 4B Dwg 8B; App 5D Dwg 9D; App 6D Dwg 10D
CD-32007-01 9AC 837.68 KB Step-by-Step Systems - No. 1, 350A or 355A - Test Distributor Circuit for Testing Subscriber Lines or for Verification Service Arranged for One-Digit Operation on Specified Levels or for 2 Digit Operation on All Levels Iss 9AC Dwg 22AC; App 1AC Dwg 23AC; App 2D Dwg 24D; App 3B Dwg 25B; App 4B Dwg 26B; App 5B Dwg 27B; App 6D Dwg 28D; App 7B Dwg 29B
CD-32042-01 6D 641.38 KB Step by Step Systems - No. 350A or 355A - Recording Completing Trunk with or without Coin with Ringback - Composite Signaling Type B or Simplex Signaling Iss 6D Dwg 9D; App 1D Dwg 10D
CD-32043-01 10D 381.03 KB Step-by-Step Systems - No. 1 or 350A - Switch Trouble Alarm Circuit - Selector Shelf Circuits - No. 355A - Miscellaneous Alarm Circuit - Selector Shelf Circuits Iss 10D Dwg 27D; App 1D Dwg 28D; App 2D Dwg 29D
CD-32045-01 8D 645.69 KB Step-by-Step Systems - No. 1 or 350A - Switch Trouble Alarm Circuit - Connector Shelf and PBX Trunk Shelf Circuits - No. 355A - Miscellaneous Alarm Circuit - Connector Shelf Circuits Iss 8D Dwg 22D; App 1D Dwg 23D; App 2AC Dwg 24AC; App 3AC Dwg 25AC; App 4B Dwg 26B; App 5B Dwg 27B; App 6D Dwg 28D; App 7D Dwg 29D; App 8D Dwg 30D
CD-32045-01 9D 255.89 KB Step-by-Step Systems - No. 1 or 350A - Switch Trouble Alarm Circuit - Connector Shelf and PBX Trunk Shelf Circuits - No. 355A - Miscellaneous Alarm Circuit - Connector Shelf Circuits Iss 9D Dwg 31D
CD-32048-01 3D 311.81 KB Step by Step Systems - No. 1 or 350A - Switch Trouble Alarm Circuit for Trunk and Miscellaneous Shelves - No. 355A - Miscellaneous Alarm Circuit for Trunk and Miscellaneous Shelves Iss 3D Dwg 11D; App 1D Dwg 12D
CD-32063-01 2D 218.07 KB Step by Step Systems - No. 350A, 355A or 356A - Trunk or Connector Alternating Relay Circuit Iss 2D Dwg 2D; App 1D Dwg 3D
CD-32069-01 7D 1.96 MB Step-by-Step Systems - No. 1, 350A, 355A, 360A or A.E. Co. 35E97 - Line Load Control Circuit Iss 7D Dwg 16D; App 1D Dwg 17D; App 2D Dwg 18D; App 3D Dwg 19D; App 4D Dwg 20D; App 5D Dwg 21D
CD-32077-01 6D 671.58 KB Step-by-Step Systems - No. 1, 350A, 355A or 360A - 3 or 4 Wire Selector for Use as Local or Incoming Selector Repeated Dialing Toll Preciding Selector or 2 Party Message Rate Selector - Absorbs Digits Once or Repeatedly - Restricts Service Over Specified Levels - Provides Timed Release on Permanent Signal or Busy Flash on Calls from Operator Iss 6D Dwg 7D; App 1D Dwg 8D
CD-32082-01 4D 753.80 KB Step-by-Step Systems - No. 1, 350A or 355A - Trunk Circuit - No. 1, 350A, 355A or 356A - Auxiliary Line Circuit for Operating Subscibers Register with Delayed Charge Interval Using Regular Central Office Battery Iss 4D Dwg 12D; App 1D Dwg 13D; App 2D Dwg 14D; App 3D Dwg 15D
CD-32084-01 2D 328.10 KB Step by Step Systems - No. 1, 350A or 355A - Auxiliary Trunk Circuit - Digit Absorbing - For Use Between Toll Selector Multiple and Intercepting Trunk Circuit or Btween Local Selector Multiple and Operator Office Trunk Circuit for Delaying Cut Thru Iss 2D Dwg 6D; App 1D Dwg 7D
CD-32087-01 1 284.97 KB Step by Step Systems - No. 1, 350A or 355A - Outgoing Repeater Circuit - Battery and Ground Pulsing - Long Range Reverse Battery Supervision - Type "B" TB Supply Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D
CD-32093-01 1 1.07 MB Step-by-Step Systems - No. 1, 350A, 355A, 360A, CX-30, CX-60, CX-100, CX-200, 32A32, 32A44, 35E97, 375A, 375B, 385A, 385B, 386A or 386B - Type "B" Emergency Manual Circuit for Manual Operation and Interception of Subscriber Lines and Trunk Circuits Iss 1 Dwg 1; App 1A Dwg 2A
CD-32123-01 3D 126.00 KB Step-by-Step Systems - No. 1, 350A, 355A, 356A, or 35-E-97 - Selector Bank Multiple Circuit Iss 3D Dwg 19D; App 1D Dwg 20D
CD-32128-01 2D 557.87 KB Step-by-Step Systems - No. 1, 350A, 355A, 356A, or 35E97 - Connector Bank Multiple Circuit Iss 2D Dwg 7D; App 10D Dwg 17D; App 11D Dwg 18D; App 12D Dwg 19D; App 13D Dwg 20D; App 1D Dwg 8D; App 2D Dwg 9D; App 3D Dwg 10D; App 4D Dwg 11D; App 5D Dwg 12D; App 6D Dwg 13D; App 7D Dwg 14D; App 8D Dwg 15D; App 9D Dwg 16D
CD-32129-01 1 297.31 KB Step-by-Step Systems - No. 1, 350A, 355A, or 35E97 - Miscellaneous Bank Multiple Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D; App 4D Dwg 5D; App 5D Dwg 6D
CD-32133-01 6D 468.01 KB Step-by-Step Systems - No. 1, 350A, 355A, 360A or 35-E-97 - Subscriber Line Circuit Iss 6D Dwg 18D; App 1D Dwg 19D; App 2B Dwg 20B; App 3A Dwg 21A; App 4B Dwg 22B; App 5D Dwg 23D; App 6B Dwg 24B; App 7B Dwg 25B
CD-32146-01 2D 558.31 KB Step by Step Systems - No. 355A Dial Office - Coin Trunk or No. 355A & No. 356A - Auxiliary Coin Line Circuit for Dial Post Payment Service Iss 2D Dwg 3D; App 1D Dwg 4D; App 2D Dwg 5D; App 3D Dwg 6D; App 4D Dwg 7D; App 5D Dwg 8D
CD-32153-01 3D 158.11 KB Step-by-Step Systems - No. 1, 350A, 355A or 356A - Miscellaneous Circuit for Angle Relay Rack Bays Iss 3D Dwg 4D
CD-32153-01 4D 400.63 KB Step-by-Step Systems - No. 1, 350A, 355A or 356A - Miscellaneous Circuit for Angle Relay Rack Bays and Universal Switch Frames Iss 4D Dwg 6D; App 1D Dwg 7D; App 2D Dwg 8D; App 3D Dwg 9D; App 4D Dwg 10D; App 5D Dwg 11D; App 6B Dwg 12B
CD-32170-01 4B 191.72 KB Step-by-Step Systems - No. 1, 350A, 355A or 360A - Outgoing Information Trunk Circuit from Local or Toll Preceding Selector Multiple with or without High Low Supervision Iss 4B Dwg 4B
CD-32178-01 2D 556.63 KB Step by Step Systems - No. 1 or 350A - 2-Wire Trunk Circuits from Selector and Connector Multiple to Repair Service Desk No. 2 Iss 2D Dwg 2D; App 1D Dwg 3D
CD-32187-01 2D 318.92 KB Step by Step Systems - No. 355A or 356A - Auxiliary Trunk Circuit Arranged to Restrict Service Iss 2D Dwg 2D; App 1D Dwg 3D
CD-32187-01 3D 362.32 KB Step by Step Systems - No. 1, 350A, 355A, 356A or 360A - Auxiliary Trunk Circuit Arranged to Restrict Service Iss 3D Dwg 4D; App 1B Dwg 5B
CD-32192-01 4D 1.30 MB Step by Step Systems - No. 355A - Miscellaneous Alarm Circuit - Alarm Control and Aisle Pilots - Permanent Signal Timing Circuit Iss 4D Dwg 9D; App 1D Dwg 10D; App 2D Dwg 11D; App 3D Dwg 12D
CD-32192-01 7D 1.27 MB Step-by-Step Systems - No. 355A - Miscellaneous Alarm Circuit - Alarm Control and Aisle Pilots - Permanent Signal Timing Circuit Iss 7D Dwg 24D; App 1D Dwg 25D
CD-32192-01 8B 1.29 MB Step-by-Step Systems - No. 355A - Miscellaneous Alarm Circuit - Permanent Signal Timing Circuit Iss 8B Dwg 26B
CD-32193-01 1 383.03 KB Step by Step Systems - No. 1, 350A or 355A - Miscellaneous Alarm Circuit - Alarm Sender Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3B Dwg 4B; App 4B Dwg 5B
CD-32194-01 3B 523.69 KB Step by Step Systems - No. 1, 350A, 355A, 35-E-97 or No. 1 with AMA - Group and Alarm Relay Ckt for Line and Trunk Finders Iss 3B Dwg 11B
CD-32199-01 2D 419.35 KB Step by Step Systems - No. 1, 350A, 355A or 35-E-97 - Outgoing Trunk Circuit to Crossbar Tandem Office for CAMA Calls Iss 2D Dwg 2D; App 1B Dwg 3B; App 2D Dwg 4D; App 3D Dwg 5D
CD-32202-01 7D 1.77 MB Step-by-Step Systems - No. 1, 350A, 355A, 356A, 360A, 35-E-97 and North Electric Co. CX Offices - Intercepting Trunk Circuit for Intercepting Calls From Connector Terminals and From Selector Levels for Use with an Announcement Machine - Announcement System No. 7A Iss 7D Dwg 16D; App 1D Dwg 17D; App 2D Dwg 18D; App 3D Dwg 19D
CD-32216-01 3D 420.10 KB Step-by-Step Systems - No. 355A or 35E97 - Subscriber Line Circuit Arranged for Lockout Iss 3D Dwg 6D; App 1D Dwg 7D; App 2D Dwg 8D
CD-32239-01 3D 363.41 KB Step-by-Step Systems - No. 1, 350A, 355A or 35E97 - Switch Trouble Alarm Circuit for Line Finders, Trunk Finders or Permanent Signal Finders Iss 3D Dwg 9D; App 1D Dwg 10D; App 2B Dwg 11B; App 3B Dwg 12B; App 4BU Dwg 13BU
CD-32241-01 5B 372.32 KB Step by Step Systems - No. 1, 350A, 355A, or 35E97 - Outgoing Trunk Circuit - E and M Lead Signaling to CAMA Office Iss 5B Dwg 12B
CD-32248-01 6D 451.33 KB Step-by-Step Systems - No. 1, 350A, 355A or 35-E-97 - Miscellaneous Circuir for ANI - Type B and Type C Trunk Frames Iss 6D Dwg 12D; App 1D Dwg 13D; App 2B Dwg 14B
CD-32289-01 3D 1.06 MB Step-by-Step Systems - No. 1, 350A, 355A, 360A or 35E97 - Coin Control Trunk Circuit Using 2 Frequencies Over Tip and Ring for Calls froM Switchboard Using Local or Toll Train Iss 3D Dwg 4D; App 1D Dwg 5D
CD-32309-01 2AC 2.72 MB Step-by-Step Systems - No. 1, 350A, 355A, or 35-E-97 - Outgoing Intercepting Trunk Circuit - E and M Lead Supervision Iss 2AC Dwg 3AC; App 1AR Dwg 4AR; App 2B Dwg 5B; App 3A Dwg 6A; App 4B Dwg 7B; App 5A Dwg 8A
CD-32310-01 1 1.46 MB Step-by-Step Systems - No. 1, 350A, 355A or 35-E-97 - Pulse Generator and Counting Circuit for Use with Intercepting Trunk Circuits Using E and M Lead Supervision Iss 1 Dwg 1; App 1A Dwg 2A; App 2D Dwg 3D; App 3D Dwg 4D
CD-32311-01 3B 318.37 KB Step by Step Systems - No. 1, 350A, 355A or 35E97 - Outgoing Trunk Circuit from Selector Multiple for Information, Repair, Official PBX or Intercepting Service - E and M Lead Supervision Iss 3B Dwg 8B
CD-32342-01 4D 5.55 MB Step-by-Step Systems - No. 1, 350A, 355A or 35E97 - Outgoing Trunk Circuit - Loop or E&M Lead Signaling - Special Toll or Operator Assistance - ANI Type B or C for No. 1, 350A, 355A or ANI Type C for 35E97 or Operator Identified to CAMA Office Iss 4D Dwg 7D; App 1B Dwg 8B; App 2B Dwg 9B; App 3D Dwg 10D; App 4B Dwg 11B; App 5D Dwg 12D
CD-32344-01 7D 7.94 MB Step-by-Step Systems - No. 1, 350A, 355A or 35-E-97 - Outgoing Coin Trunk Circuit - Loop or E&M Lead Signaling - Arranged to Handle Special Toll or Operator Assistance and Station to Station Sent Paid Calls - ANI-B or C for No. 1, 350A or 355A or ANI-C for 35E97 or Operator Identified to CAMA Iss 7D Dwg 15D; App 1B Dwg 16B
CD-32531-01 3AC 315.26 KB Step-by-Step Systems - No. 1, 350A, 355A - Auxiliary Trunk Circuit Arranged for Intercept Service Between Connector Numbers in SXS ANI-B Type Offices and an Automatic Intercept System Iss 3AC Dwg 4AC; App 1A Dwg 5A; App 2AR Dwg 6AR; App 3B Dwg 7B; App 4B Dwg 8B
CD-32539-01 1 6.48 MB Step-by-Step Systems - No. 1, 350A, 355A, 360A or 35-E-97 - Coin Trunk Circuit for Use Preceding a First Selector Serving Coin Lines Arranged for Prepay or Coinless Access to Specified Numbers Iss 1 Dwg 1; App 1A Dwg 2A; App 2A Dwg 3A; App 3B Dwg 4B
CD-33003-01 2D 2.01 MB Step-by-Step Systems - No. 1, 350A, 355A or 360A - Local, Incoming or 2 Party Message Rate - 3 or 4 Wire Selector Arranged to Restrict Service Over Any Specified Levels, for Peg Count on Cut Thru, and for Timed Release on Permanent Signal or Busy Flash on Calls from Operator Iss 2D Dwg 3D; App 1D Dwg 4D; App 2D Dwg 5D; App 3D Dwg 6D; App 4D Dwg 7D; App 5D Dwg 8D
CD-33013-01 4D 2.61 MB Step-by-Step Systems - No. 1, 350A, 355A, 360A or 35-E-97 - 200 Point Line or Trunk Finder - 3 Wire Iss 4D Dwg 5D; App 1D Dwg 6D; App 2D Dwg 7D; App 3D Dwg 8D; App 4D Dwg 9D; App 5D Dwg 10D
CD-33015-01 3D 2.01 MB Step-by-Step Systems - No. 1, 350A, 355A, or 35-E-97 - Line Finder Circuit - 200 Point - 4 Wire Iss 3D Dwg 4D; App 1D Dwg 5D; App 2D Dwg 6D; App 3D Dwg 7D; App 4D Dwg 8D; App 5AC Dwg 9AC
CD-33022-01 4D 2.28 MB Step by Step Systems - No. 1, 350A, 355A, 360A or 35-E-97 - Coin Connector Circuit - One Ring Iss 4D Dwg 12D; App 1D Dwg 13D
CD-33027-01 1 1.75 MB Step by Step Systems - No. 1, 350A, 355A or 360A - Code Selector Circuit Arranged to Absorb Digits Repeatedly and to Restrict Service Until a Digit is Absorbed Iss 1 Dwg 1
CD-35033-01 1 619.57 KB Step-by-Step Systems - No. 1, 350A, 355A or 35E97 with "TOUCH-TONE" Type D - Converter Trunk and Link Iss 1 Dwg 1; App 1B Dwg 2B; App 2A Dwg 3A; App 3AR Dwg 4AR
CD-3C252-01 3A 3.32 MB Common Systems - T1C Office Repeater Bay - Application Schematic Iss 3A Dwg 3A; App 1B Dwg 4B; App 2A Dwg 5A; App 3B Dwg 6B; App 4B Dwg 7B; App 5D Dwg 8D
CD-3C254-01 3B 870.44 KB Common Systems - T1C Digital Line - Order Wire Circuit Iss 3B Dwg 4B
CD-3C285-01 1 2.42 MB Common Systems - T1 Digital Line - 221-Type Office Repeater Iss 1 Dwg 1; App 1A Dwg 2A
CD-3C290-01 1 1022.81 KB Common Systems - 4B Channel PCM Bank Type D4 - Maintenance Bank - Application Schematic Iss 1 Dwg 1; App 1A Dwg 2A; App 2AC Dwg 3AC; App 3B Dwg 4B
CD-3C292-01 2A 486.94 KB Common Systems - 660 Communication Panel Circuits Iss 2A Dwg 2A; App 1B Dwg 3B
CD-3C292-01 4D 683.69 KB Common Systems - 660 Communication Panel Circuit Iss 4D Dwg 7D; App 1D Dwg 8D; App 2A Dwg 9A; App 3B Dwg 10B; App 4D Dwg 11D; App 5B Dwg 12B; App 6B Dwg 13B
CD-3C304-02 1 1.94 MB Common Systems - 48 Channel PCM Bank Type D4 - Application Schematic Iss 1 Dwg 1; App 1B Dwg 2B
CD-3C311-01 2B 490.40 KB Common Systems - 48 Channel PCM Bank Type D4 - Trunk Processing Unit (TPU) Iss 2B Dwg 2B
CD-3C348-01 1 1009.40 KB Toll Systems - T1C/T1 Quasi Random Signal Source (QRSS) Iss 1 Dwg 1; App 1A Dwg 2A
CD-3D031-01 3A 2.48 MB Data Systems - Station - Data Auxiliary Sets 820D and 820E Types Iss 3A Dwg 6A; App 1D Dwg 7D; App 2B Dwg 8B
CD-3F027-01 2B 298.59 KB Signaling and Packet Switching Systems - Common Network Interface - Digital Facility Access Cabinet Circuit Iss 2B Dwg 3B; App 1A Dwg 4A; App 2B Dwg 5B; App 3A Dwg 6A; App 4B Dwg 7B
CD-3H110-01 2A 1.64 MB Electronic Switching Systems - No. 3 - Peripheral Control Circuit Iss 2A Dwg 2A
CD-3H120-01 2A 1.13 MB Electronic Switching Systems - No. 3 - 15A Remreed Grid Circuit Iss 2A Dwg 2A; App 1A Dwg 3A; App 2A Dwg 4A; App 3D1 Dwg 5D1
CD-3H121-01 2A 749.24 KB Electronic Switching Systems - No. 3 - 15B Remreed Grid Circuit Iss 2A Dwg 2A; App 1D Dwg 3D
CD-3H122-01 2A 355.84 KB Electronic Switching Systems - No. 3 - First and Second Stage Access Circuit Iss 2A Dwg 2A
CD-3H130-01 1 473.68 KB Electronic Switching Systems - No. 3 - 15C Remreed Grid Circuit Iss 1 Dwg 1; App 1D Dwg 2D
CD-3H131-01 2A 408.47 KB Electronic Switching Systems - No. 3 - Third Stage Access Circuit Iss 2A Dwg 2A
CD-3H140-01 2A 550.49 KB Electronic Switching Systems - No. 3 - Master Scanner Matrix Circuit Iss 2A Dwg 2A
CD-3H150-01 1 347.23 KB Electronic Switching Systems - No. 3 - Distribute Point Circuit Iss 1 Dwg 1; App 1D Dwg 2D
CD-3H200-01 2A 1.75 MB Electronic Switching Systems - No. 3 - Junctor and Junctor Control Circuit Iss 2A Dwg 2A
CD-3H205-01 1 452.99 KB Electronic Switching Systems - No. 3 - Dial-Tone-First Coin Line Circuit Iss 1 Dwg 1
CD-3H208-01 1 511.39 KB Electronic Switching Systems - No. 3 - Noise Immunity Line Circuit Iss 1 Dwg 1; App 1A Dwg 2A
CD-3H220-01 2A 1.43 MB Electronic Switching Systems - No. 3 - Universal Trunk Circuit Iss 2A Dwg 2A; App 1A Dwg 3A; App 2D Dwg 4D
CD-3H401-01 2A 1.02 MB Electronic Switching Systems - No. 3 - "TOUCH-TONE" Calling Detector Circuit Iss 2A Dwg 2A; App 1A Dwg 3A
CD-3H402-01 2A 1.15 MB Electronic Switching Systems - No. 3 - Multifrequency Receiver Circuit Iss 2A Dwg 2A
CD-3H403-01 1 522.65 KB Electronic Switching Systems - No. 3 - Dial Pulse Transmitter Circuit Iss 1 Dwg 1
CD-3H404-01 1 1.19 MB Electronic Switching Systems - No. 3 - Multifrequency Transmitter Circuit Iss 1 Dwg 1
CD-3H406-01 1 1.27 MB Electronic Switching Systems - No. 3 - Superimposed Ringing Circuit Iss 1 Dwg 1; App 1A Dwg 2A
CD-3H410-01 2A 1.74 MB Electronic Switching Systems - No. 3 - Customer Dial Pulse Receiver and Regular Ringing Circuit Iss 2A Dwg 2A; App 1A Dwg 3A
CD-3H411-01 3A 1.07 MB Electronic Switching Systems - No. 3 - Coin, Tone, Announcement and Conference Circuit Iss 3A Dwg 3A; App 1B Dwg 4B
CD-3H520-01 2A 6.76 MB Electronic Switching Systems - No. 3 - Peripheral Test Circuit Iss 2A Dwg 2A; App 1A Dwg 3A; App 2B Dwg 4B
CD-3H901-01 2A 585.22 KB Electronic Switching Systems - No. 3 - Network Frame Circuit Iss 2A Dwg 2A; App 1A Dwg 3A; App 2A Dwg 4A
CD-3H902-01 2A 1.51 MB Electronic Switching Systems - No. 3 - Control Frame Circuit Iss 2A Dwg 2A; App 1AC Dwg 3AC; App 2A Dwg 4A; App 3A Dwg 5A; App 4B Dwg 6B
CD-3H904-01 2A 867.71 KB Electronic Switching Systems - No. 3 - Test Frame Circuit Iss 2A Dwg 2A
CD-3H905-01 2A 873.28 KB Electronic Switching Systems - No. 3 - Miscellaneous Power Circuit Iss 2A Dwg 2A; App 1A Dwg 3A; App 2D Dwg 4D
CD-3H907-01 1 409.47 KB Electronic Switching Systems - No. 3 - DC Power Distribution Circuit Iss 1 Dwg 1; App 1A Dwg 2A; App 2D Dwg 3D
CD-3H908-01 1 268.94 KB Electronic Switching Systems - No. 3 - AC Power Distribution Circuit Iss 1 Dwg 1; App 1D Dwg 2D
CD-3H911-01 2B 202.32 KB Electronic Switching Systems - No. 3 - Distribute Point Applique Circuit Iss 2B Dwg 2B; App 1BU Dwg 3BU
CD-3H912-01 3D 226.74 KB Electronic Switching Systems - No. 3 - Scanner, Peripheral Pulse Distributor and Peripheral Decoder - Assignment Rules and Compatibility Guide Iss 3D Dwg 3D
CD-3H914-01 1 214.37 KB Electronic Switching Systems - No. 3 - Data Interface Circuit Iss 1 Dwg 1
CD-3T003-01 1 152.56 KB Common Systems - 3B20D Model 3 Processor - SCSI Growth or Conversion Unit Circuit Iss 1 Dwg 1; App 1A Dwg 2A; App 2A Dwg 3A
CD-3T004-01 1 254.34 KB Common Systems - 3B20D Model 2 & 3 Processor - Small Computer Systems Interface (SCSI) - New Ship Unit Circuit Iss 1 Dwg 1
CD-3T011-01 3B 681.25 KB Common Systems - 3B21D Computer - Processor Circuit Unit Iss 3B Dwg 3B
CD-3T012-01 2B 338.72 KB Common Systems - 3B21D Computer - Growth Unit Circuit Iss 2B Dwg 2B
CD-3T015-01 1 340.72 KB Common Systems - 3B21D Computer - Computer Systems Circuit Iss 1 Dwg 1; App 1B Dwg 2B
CD-4C003-01 3AC 339.79 KB Common Systems - Lighting Circuit - Fluorescent Type and Appliance Outlets for Electronic Switching Systems Areas Iss 3AC Dwg 3AC
CD-4C005-02 1 313.05 KB Common Systems - Programmable Read Only Memory Circuit Iss 1 Dwg 1
CD-4C035-01 1 317.61 KB Common Systems - Toll Power Distributing Unit Circuit for Use with No. 2 ESS, 2A ESS, 3 ESS Iss 1 Dwg 1
CD-4C053-01 2 343.50 KB Common Systems - AT&T 3B20D Models 1, 2 and 3 Computer - AC & DC Power Distribution Circuit Iss 2 Dwg 5A
CD-4C065-01 1 133.32 KB Common Systems - 3B20D Models 1, 2 and 3 Processor - Port Switch Unit Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2D Dwg 3D; App 3M Dwg 4M
CD-4C097-01 2B 217.24 KB Common Systems - 3B20D Model 2 and 3 Processor - Main Store and IOP Growth Unit Circuit Iss 2B Dwg 9B
CD-4C098-01 2B 221.57 KB Common Systems - 3B20D Model 2 and 3 Processor - Central Processing Unit Circuit Iss 2B Dwg 10B; App 1B Dwg 11B; App 2B Dwg 12B; App 3B Dwg 13B; App 6B Dwg 16B
CD-4C099-01 2B 340.04 KB Common Systems - 3B20D Model 2 & 3 Processor - Main Store, IO and DFC Unit Circuit Iss 2B Dwg 10B; App 1B Dwg 11B; App 3B Dwg 13B; App 4M Dwg 14M
CD-4C101-01 2 145.94 KB Common Systems - 3B20D Model 2 & 3 Processor - I/O Processor Basic Unit Circuit Iss 2 Dwg 11M
CD-4C102-01 1 53.06 KB Common Systems - 3B20D Model 2 & 3 Processor - Power Distribution Unit Circuit Iss 1 Dwg 1; App 1B Dwg 2B
CD-4C115-01 1 156.44 KB Common Systems - 3B20S Model 2 Processor - IO Processor and DFC Controller Unit Circuit Iss 1 Dwg 1; App 1A Dwg 2A; App 2B Dwg 3B; App 3B Dwg 4B; App 4B Dwg 5B; App 5B Dwg 6B; App 6AC Dwg 7AC
CD-4C119-01 1 228.64 KB Common Systems - 3B20D Model 2 & 3 Processor - Processor Control Cabinet Circuit for 5ESS Iss 1 Dwg 1; App 1B Dwg 2B; App 2AC Dwg 3AC; App 3B Dwg 4B; App 4A Dwg 5A; App 5B Dwg 6B; App 6AC Dwg 7AC; App 7M Dwg 8M; App 8B Dwg 9B
CD-4C120-01 1 124.70 KB Common Systems - 3B20D Model 2 Processor - Tape Unit Cabinet Circuit Iss 1 Dwg 1; App 1B Dwg 2B
CD-4C122-01 1 221.28 KB Common Systems - 3B20D Model 2 & 3 Processor - Processor System Cabinet for 5ESS Iss 1 Dwg 1; App 1B Dwg 2B; App 2B Dwg 3B; App 3B Dwg 4B; App 4A Dwg 5.pdf; App 5A Dwg 6A; App 6AC Dwg 7AC; App 7B Dwg 8B
CD-4C122-01 2B 149.05 KB Common Systems - 3B20D Model 2 and 3 Processor - Processor System Cabinet for 5ESS Iss 2B Dwg 9B; App 1B Dwg 10B
CD-4C126-01 1 133.20 KB Common Systems - 3B20D Model 3 Processor - Tape / Disk Cabinet Iss 1 Dwg 1; App 1B Dwg 2B; App 2B Dwg 3B
CD-4C127-01 2B 247.97 KB Common System - 3B20D Model 3 Computer - Computer System Circuit Iss 2B Dwg 10B; App 1B Dwg 11B; App 2B Dwg 12B; App 3B Dwg 13B; App 4B Dwg 14B; App 5B Dwg 15B
BT-51005-01 1929-03-19 3 75.62 MB Subscriber's Sender Circuit - 2 Digit Office Code - Panel Machine Switching System Iss 3 Dwg 24
BT-51009-01 1931-06-24 4 849.85 KB Panel System - Sender Circuit - Subscriber's 2 Digit Non-Coin App 1 Dwg 29
CD-51546-01 11B 4.73 MB Toll Systems - TD Radio - Application Schematic for TD-3D Transmitter-Receiver Bay Iss 11B Dwg 36B; App 1B Dwg 37B; App 2B Dwg 38B
BT-52005-02 1933-03-23 1 40.75 MB Line Circuit - District Selector Circuit - Line Finder Circuit - Arranged for Individual Message Register or Flat Rate Service - 400 Point Lockout Type Line Finder - Panel System Iss 1 Dwg 1; App 1 Dwg 7; App 2 Dwg 18; App 3 Dwg 24; App 4 Dwg 35; App 5 Dwg 41
BT-52005-03 1933-03-30 3 38.66 MB Line Circuit - District Selector Circuit - Line Finder Circuit - Arranged for Two Party Message Rate Lines - 400 Point Lockout Type Line Finder - Panel System Iss 3 Dwg 22; App 1 Dwg 28; App 2 Dwg 31
BT-53007-01 1926-11-16 2 1.34 MB Selector Circuit - Incoming From Special "A" Switchboard - Three Wire Dialing - Panel Machine Switching System Iss 2 Dwg 3
BT-54001-01 1930-02-17 3 31.52 MB For Miscellaneous Alarm Circuit - Appearing On Floor Alarm Board - Panel System Iss 3 Dwg 38; App 1 Dwg 40; App 2 Dwg 43
BT-54002-01 1930-02-11 3 1.94 MB Power Alarm Circuits - Panel System Iss 3 Dwg 17; App 1 Dwg 22
CD-55039-01 8D 231.27 KB Toll Systems - Toll Switchboard No. 1B, 3B, 3C, 3CF, 3CL, or 5 - Toll Testboard No. 17B, 17C, or 18B - Toll Test Unit No. 1A or 3A - Automatic Outgoing Intertoll Trunk Test Frame - Tandem Patching Bay - Circuit Patching Bay - Auxiliary Signal and Night Alarm Circuit Iss 8D Dwg 13D
CD-55392-01 5B 2.13 MB Toll Systems - Signaling - 1000 Cycle Signal Receiving Circuit Iss 5B Dwg 7B; App 1D Dwg 8D; App 2B Dwg 9B; App 3D Dwg 10D; App 4B Dwg 11B; App 5D Dwg 12D; App 6D Dwg 13D; App 7D Dwg 14D; App 8D Dwg 15D; App 9D Dwg 16D
CD-55574-01 6D 3.15 MB Toll Systems - Signaling - Telephone Order Wire Circuit - 1000 Cycle or 1900 Cycle Ringdown Signaling Iss 6D Dwg 8D; App 1D Dwg 9D
CD-56073-01 3D 763.42 KB Toll Systems - "L" or "N" Carrier Telephone - Telephone Circuit for Use in Offices with 24, 48, 130 or 152 Volt Battery Supply Iss 3D Dwg 5D
CD-56112-01 8D 1.25 MB Toll Systems - Signaling - Television Order Wire Circuit Iss 8D Dwg 10D; App 1D Dwg 11D; App 2AC Dwg 12AC
CD-56137-01 6D 924.56 KB Toll Systems - Signaling - Miscellaneous Jack Circuit - 1600 or 2000 Cycle Signaling for Signaling Test Circuit Iss 6D Dwg 9D; App 1D Dwg 10D; App 2D Dwg 11D
CD-56163-01 2D 1.34 MB Toll Systems - Signaling - Signaling Converter Circuit for N or O Carrier or Single Frequency Signaling Circuit to 20 Cycle Ringdown Circuit Iss 2D Dwg 3D; App 1D Dwg 4D; App 2B Dwg 5B; App 3D Dwg 6D
CD-56454-01 2A 1.01 MB Toll Systems - "O" & "ON" Carrier - Remote Alarm Release Circuit Iss 2A Dwg 2A
CD-5D001-01 5M 35.90 KB 5ESS Switching System - Floor Plan Data Iss 5M Dwg 5M
CD-5D001-02 3M 71.87 KB 5ESS Switching System - Floorplan Data for the 5ESS-2000 Switch Cabinet Iss 3M Dwg 3M; App 1M Dwg 4M
CD-5D002-01 3D 224.79 KB 5ESS Switching Equipment - Current Drain Data Iss 3D Dwg 3D; App 1D Dwg 4D; App 2M Dwg 5M; App 3M Dwg 6M; App 4M Dwg 7M; App 5M Dwg 8M
CD-5D003-01 1 43.31 KB 5ESS Switching Equipment - Limiting Conductor Specification Iss 1 Dwg 1
CD-5D004-01 4A 286.14 KB Electronic Switching Systems - 5ESS - AC Power Distribution Circuit Iss 4A Dwg 8B
CD-5D005-01 6B 285.05 KB 5ESS Switching Equipment - DC Power Distribution Circuit Iss 6B Dwg 16B
CD-5D007-01 28M 128.68 KB 5ESS Switching Equipment Assignment Rules Iss 28M Dwg 30M
CD-5D008-01 3A 536.23 KB 5ESS Electronic Switching Equipment - Office Alarm Unit Circuit Iss 3A Dwg 3A; App 1D Dwg 4D; App 2B Dwg 5B; App 3A Dwg 6A; App 4B Dwg 7B; App 5A Dwg 8A; App 6B Dwg 9B
CD-5D011-01 2D 151.55 KB 5ESS Switching Equipment - Data Set Application Schematic Circuit Iss 2D Dwg 3D
CD-5D012-01 2D 148.06 KB 5ESS Switching Equipment - Interface Module Application Schematic Iss 2D Dwg 2D; App 1A Dwg 3A; App 2D Dwg I4D
CD-5D012-02 3B 339.73 KB 5ESS Switching Equipment - Switching Module Application Schematic Iss 3B Dwg 6B; App 1B Dwg 7B; App 2B Dwg 8B; App 3B Dwg 9B; App 4B Dwg 10B; App 5B Dwg 11B
CD-5D014-01 4A 74.24 KB 5ESS Switching Equipment - Application Schematic for 5ESS System (7 Ft. Frames and Cabinets) Iss 4A Dwg I5A; App 1D Dwg 6D
CD-5D014-02 20M 55.44 KB 5ESS Switching Equipment - Application Schematic for 5ESS System (6 Ft. Cabinets) Iss 20M Dwg 30M
CD-5D015-01 1 398.66 KB 5ESS Switching Equipment - Modular Metallic Service Unit Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2A Dwg 3A; App 3D Dwg 4D; App 4A Dwg ID5A; App 5M Dwg 6M; App 6B Dwg 7B; App 7B Dwg 8B; App 8M Dwg 9M
CD-5D016-01 1 279.15 KB 5ESS Switching Equipment - Modular Metallic Service Unit Interconnection Iss 1 Dwg 1
CD-5D017-01 2M 105.11 KB 5ESS Switching Equipment - Audible and Visual Alarm Circuit Iss 2M Dwg 10ME; App 1M Dwg 11M; App 2B Dwg 12B
CD-5D019-02 1 107.40 KB 5ESS Switching Equipment - 3 Fan Unit and Alarm Circuit for 6 Foot Cabinet Iss 1 Dwg 1; App 1B Dwg 2B; App 2B Dwg 3B
CD-5D026-01 5A 217.66 KB 5ESS Switching Equipment - Message Switch Control Unit Circuit Iss 5A Dwg 5A
CD-5D035-01 1 2.04 MB 5ESS Switching Equipment - Digital Service Unit Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2AC Dwg 3AC; App 3A Dwg 4A; App 4B Dwg 5B; App 5B Dwg 6B
CD-5D037-01 2D 194.61 KB 5ESS Switching Equipment - Time Multiplexed Switch Control Unit Circuit Iss 2D Dwg 5D; App 1B Dwg 6B
CD-5D043-01 2D 142.12 KB 5ESS Switching Equipment - Time Multiplexed Switch Unit Circuit Iss 2D Dwg 5D; App 1B Dwg 6B
CD-5D044-01 3AC 177.38 KB 5ESS Switching Equipment - Resistor Panel Circuit Iss 3AC Dwg 3AC; App 1D Dwg 4D; App 2B Dwg 5B; App 3M Dwg 6M; App 4M Dwg 7M; App 5B Dwg 8B; App 6M Dwg 9M
CD-5D045-01 2 1.13 MB 5ESS Switching Equipment - Time Slot Interchanger Unit, Model 2 Circuit Iss 2 Dwg 12D
CD-5D048-01 2A 293.78 KB 5ESS Switching Equipment - Memory Expansion Unit Circuit Iss 2A Dwg 2A; App 1AC Dwg 3AC; App 3B Dwg 5B; App 4A Dwg 6A; App 5B Dwg 7B; App 6B Dwg 8B
CD-5D052-02 1 581.86 KB 5ESS Switching Equipment - Line Unit, Model 2 Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2AC Dwg 3AC; App 3B Dwg 4B; App 4B Dwg 5B; App 5M Dwg 6M; App 6A Dwg 7A
CD-5D053-01 2D 320.10 KB 5ESS Switching Equipment - Fuse / Filter Panel Circuit Iss 2D Dwg 5D; App 1B Dwg 6B; App 2M Dwg 9M
CD-5D060-01 2 448.63 KB 5ESS Switching Equipment - Communication Module Control Unit Circuit Iss 2 Dwg 9M; App 1B Dwg 10B; App 2B Dwg 11B; App 3B Dwg 12B; App 4M Dwg 13M; App 5M Dwg 14M
CD-5D061-01 3B 1.03 MB 5ESS Switching Equipment - Time Multiplexed Switch Unit Model 2 Circuit Iss 3B Dwg 7B
CD-5D064-01 2B 381.58 KB Electronic Switching Systems - 5ESS - Operator Services Position System - Link Adapter Unit Iss 2B Dwg 3B
CD-5D066-01 1 450.88 KB 5ESS Switching Equipment - Message Switch Peripheral Unit, Model 2 Iss 1 Dwg 1; App 1A Dwg 2A
CD-5D070-01 1 189.01 KB 5ESS Switching Equipment - +48V DC Power Distribution Circuit Iss 1 Dwg 1
CD-5D071-01 1 341.05 KB 5ESS Switching Equipment - Operating Support Systems - Interface Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2A Dwg 3A; App 3B Dwg 4B; App 4M Dwg 5M; App 5B Dwg 6B; App 6M Dwg 7M; App 7B Dwg 8B; App 8M Dwg 9M
CD-5D071-01 2 227.23 KB 5ESS Switching Equipment - Operating Support Systems - Interface Circuit Iss 2 Dwg 10B; App 1B Dwg 11B; App 2M Dwg 12M; App 3M Dwg 13M
CD-5D074-01 4B 514.28 KB 5ESS Switching Equipment - Packet Switch Unit Circuit Iss 4B Dwg 12B
CD-5D075-01 2M 246.96 KB 5ESS Switching Equipment - Remote Clock Unit Circuit Iss 2M Dwg 10M; App 1B Dwg 11B; App 2B Dwg 12B
CD-5D077-01 1 566.69 KB 5ESS Switching Equipment - Message Switch Control Unit Model 2 Circuit Iss 1 Dwg 1; App 1A Dwg 2A; App 2M Dwg 3M; App 3B Dwg 4B
CD-5D078-01 1 461.74 KB 5ESS Switching Equipment - Message Switch Peripheral Unit, Model 3 Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2M Dwg 3M; App 3B Dwg 4B; App 4B Dwg 5B
CD-5D081-01 1 217.49 KB 5ESS Switching Equipment - 6 Fan Unit Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2M Dwg 3M; App 3B Dwg 4B
CD-5D081-02 1 151.31 KB 5ESS Switching Equipment - 6 Fan Unit Circuit Iss 1 Dwg 1; App 1B Dwg 2B
CD-5D082-01 2 1.15 MB 5ESS Switching Equipment - Message Interface / Clock Unit Model 2 Circuit Iss 2 Dwg 3D; App 1D Dwg 4D; App 2AC Dwg 5AC; App 3M Dwg 6M; App 4B Dwg 7B
CD-5D084-01 1 345.29 KB 5ESS Switching Equipment - Fuse / Filter Panel 3 Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2B Dwg 3B; App 3M Dwg 4M
CD-5D085-01 3A 339.99 KB 5ESS Switching Equipment - ECL Bus Unit (EBUS) Circuit Iss 3A Dwg 11M; App 1B Dwg 12B; App 2B Dwg 13B
CD-5D086-01 1 370.32 KB 5ESS Switching Equipment - Transmission Rate Converter Unit Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2M Dwg 3M; App 3M Dwg 4M
CD-5D086-02 2 577.24 KB 5ESS Switching Equipment - Transmission Rate Converter Unit Model 2 Circuit Iss 2 Dwg 3B; App 1M Dwg 4M; App 2B Dwg 5B
CD-5D087-01 1 326.67 KB 5ESS Switching Equipment - Fuse / Filter Panel 4 Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2M Dwg 3M
CD-5D089-01 1 312.99 KB 5ESS Switching Equipment - Integrated Services Line Unit - Common Shelf Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2B Dwg 3B; App 3A Dwg 4A; App 4B Dwg 5B
CD-5D090-01 1 300.69 KB 5ESS Switching Equipment - Integrated Services Line Unit - Drawer Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2B Dwg 3B; App 3B Dwg 4B
CD-5D091-01 1 453.55 KB 5ESS Switching Equipment - Integrated Services Line Unit Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2B Dwg 3B; App 3A Dwg 4A; App 4B Dwg 5B
CD-5D092-01 2B 621.29 KB 5ESS Switching Equipment - Digital Service Unit Model 2 Circuit Iss 2B Dwg 9B; App 1B Dwg 10B; App 2B Dwg 11B; App 3B Dwg 12B; App 4B Dwg 13B
CD-5D094-01 3B 1.86 MB 5ESS Switching Equipment - Module Controller and Time Slot Interchange Unit Iss 3B Dwg 21B; App 1B Dwg 22B; App 2B Dwg 23B; App 3B Dwg 24B
CD-5D099-01 2A 187.78 KB 5ESS Switching Equipment - Test Access Unit Circuit Iss 2A Dwg 2A; App 1M Dwg 3M; App 2M Dwg 4M; App 3M Dwg 5M
CD-5D101-01 1 66.40 KB Electronic Switching Systems - No. 5 - Master Control Center and Supplementary Trunk Line Work Station Circuit Iss 1 Dwg 1
CD-5D114-01 1 115.35 KB 5ESS Switching Equipment - Master Control Center / Trunk Line Workstation (6 Ft. 20 In. Depth) Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2M Dwg 3M
CD-5D118-01 2A 1.27 MB 5ESS Switching Equipment - Switching Module Control Cabinet Circuit Iss 2A Dwg 2A; App 1AC Dwg 3AC; App 2D Dwg 4D; App 3B Dwg 5B; App 4A Dwg 6A; App 5D Dwg 7D; App 6D Dwg 8D; App 7A Dwg 9A
CD-5D119-01 2D 243.32 KB 5ESS Switching Equipment - Line Trunk Peripheral Cabinet (6 Ft.) Circuit Iss 2D Dwg 2D; App 1B Dwg 3B; App 2D Dwg 4D; App 3D Dwg 5D
CD-5D119-02 1 360.56 KB 5ESS Switching Equipment - Line Trunk Peripheral Cabinet Iss 1 Dwg 1; App 1M Dwg 2M; App 2M Dwg 3M; App 3M Dwg 4M; App 4M Dwg 5M; App 5B Dwg 6B
CD-5D123-01 2A 375.81 KB 5ESS Switching Equipment - Remote Integrated Services Line Unit Cabinet Circuit Iss 2A Dwg 2A; App 3B Dwg 5B
CD-5D129-01 3 1.16 MB 5ESS Switching Equipment - Switching Module Processor Unit, Model 2 Circuit Iss 3 Dwg 16M; App 1A Dwg 17A; App 2A Dwg 18A; App 3B Dwg 19B; App 4B Dwg 20B
CD-5D130-01 5A 683.80 KB 5ESS Electronic Switching Equipment - Miscellaneous Cabinet (6 Ft.) Circuit Iss 5A Dwg 25A; App 1B Dwg 26B; App 2B Dwg 27B; App 3B Dwg 28B; App 4B Dwg 29A; App 5B Dwg 30B; App 6B Dwg 31B; App 7B Dwg 32B
CD-5D132-01 1 86.20 KB 5ESS Switching Equipment - 5A RSM Application Schematic Iss 1 Dwg 1
CD-5D133-01 1 147.13 KB 5ESS Switching Equipment - Remote Applications Schematic Circuit Iss 1 Dwg 1; App 1AC Dwg 2AC; App 2B Dwg 3B; App 3B Dwg 4B; App 4B Dwg 5B
CD-5D135-01 2M 95.30 KB Electronic Switching Systems - 5ESS - Operator Services Positions System Applications Schematic Iss 2M Dwg 10M; App 1B Dwg 11B; App 2M Dwg 12M; App 3B Dwg 13B
CD-5D136-01 2 310.81 KB 5ESS Switching Equipment - Message Switch Peripheral Unit Circuit Iss 2 Dwg 4AC; App 1B Dwg 5B; App 2B Dwg 6B; App 3AC Dwg 7AC; App 4B Dwg 8B
CD-5D137-01 1 143.19 KB Electronic Switching Systems - 5ESS - Automatic Call Distributor / Management Information System Application Schematic Iss 1 Dwg 1; App 1B Dwg 2B; App 2B Dwg 3B; App 3B Dwg 4B; App 4B Dwg 5B
CD-5D139-01 1 91.37 KB 5ESS Switching Equipment - Intercabinet Communications Circuit Iss 1 Dwg 1; App 1D Dwg 2D
CD-5D140-01 2 464.47 KB 5ESS Switching Equipment - Communication Module, Model 2 Circuit Iss 2 Dwg 12M; App 1M Dwg 13M; App 2A Dwg 14A; App 3M Dwg 15M; App 4B Dwg 16B; App 5M Dwg 17M
CD-5D142-01 1 92.54 KB 5ESS Switching Equipment - Supplementary Trunk Line Work Station (6 Ft. x 20 In. Depth) Circuit Iss 1 Dwg 1; App 1B Dwg 2B
CD-5D144-01 2 479.80 KB 5ESS Switching Equipment - Communication Module, Model 2 Circuit Iss 2 Dwg 8AC; App 1M Dwg 9M; App 2A Dwg 10A; App 4M Dwg 11M; App 5B Dwg 13B; App 6B Dwg 14B
CD-5D144-02 2 420.12 KB 5ESS Switching Equipment - Communications Module Model 2 - Double Dual Fabric Circuit Iss 2 Dwg 3B; App 1M Dwg 4M; App 2A Dwg 5A
CD-5D145-01 1 421.66 KB Electronic Switching Systems - 5ESS - Operator Services Position System - Power Distribution Cabinet Iss 1 Dwg 1; App 1M Dwg 2M
CD-5D146-01 2 283.20 KB 5ESS Switching Equipment - Message Switch Cabinet Circuit Iss 2 Dwg 5B; App 1M Dwg 6M; App 2B Dwg 7B
CD-5D147-01 2 199.48 KB 5ESS Switching Equipment - Time Multiplexed Switch Cabinet Circuit Iss 2 Dwg 3D; App 1B Dwg 4B; App 2B Dwg 5B
CD-5D148-01 1 20.65 KB 5ESS Switching Equipment - Alarm and Status Unit Model 2 Circuit App 2B Dwg 3B
CD-5D149-01 1 120.33 KB Electronic Switching Systems - 5ESS Switch - Message Detail Records - Translator Applications Processor Application Schematic Iss 1 Dwg 1; App 1B Dwg 2B; App 2M Dwg 3M
CD-5D151-01 2M 2.09 MB 5ESS Switching Equipment - Module Controller and Time Slot Interchange Unit, Model 2 Circuit Iss 2M Dwg 9M; App 1B Dwg 10B; App 2B Dwg 11B; App 3B Dwg 12B; App 4M Dwg 13M; App 5B Dwg 14B; App 6B Dwg 15B; App 7B Dwg 16B; App 8B Dwg 17B; App 9B Dwg 18B
CD-5D151-01 3B 16.01 KB 5ESS Switching Equipment - Module Controller and Time Slot Interchange Unit, Model 2 Circuit Iss 3B Dwg 19B
CD-5D160-01 1 650.23 KB 5ESS Switching Equipment - Switching Module Control Cabinet Model 2 Circuit Iss 1 Dwg 1; App 1M Dwg 2M; App 2B Dwg 3B; App 3M Dwg 4M; App 4M Dwg 5M; App 5M Dwg 6M; App 6B Dwg 7B; App 7B Dwg 8B; App 8B Dwg 9B
CD-5D162-01 1 129.98 KB 5ESS Switching Equipment - 6 Fan Exhaust Unit Circuit Iss 1 Dwg 1
CD-5D168-01 1 195.95 KB 5ESS Switching Equipment - 6 Fan Bi-Directional Unit Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2B Dwg 3B
CD-5D168-02 1 203.12 KB 5ESS Switching Equipment - 6 Fan Bi-Directional Unit Circuit App 1B Dwg 2B; App 2M Dwg 3M; App 3M Dwg 4M; App 4M Dwg 5M
CD-5D171-01 1 155.58 KB Electronic Switching Systems - 5ESS - 3A Simplified Message System - Interface Translator - Application Processor - Application Schematic Iss 1 Dwg 1; App 1B Dwg 2B; App 2AC Dwg 3AC; App 3B Dwg 4B; App 4B Dwg 5B; App 5B Dwg 6B; App 6B Dwg 7B
CD-5D178-01 3B 207.93 KB Electronic Switching Systems - 5ESS - Communication Module Processor Unit Circuit Iss 3B Dwg 3B
CD-5D180-01 1 750.06 KB 5ESS Switching Equipment - Line Unit, Model 3 Circuit Iss 1 Dwg 1; App 1M Dwg 2M; App 2M Dwg 3M
CD-5D190-01 1 266.00 KB 5ESS Switching Equipment - Modular Fuse Filter Unit Circuit Iss 1 Dwg 1
CD-5D191-01 1 170.88 KB 5ESS Switching Equipment - Time Multiplexed Switch Unit Model 3 Circuit Iss 1 Dwg 1
CD-5D191-01 2B 215.15 KB 5ESS Switching Equipment - Time Multiplexed Switch Unit Model 3 Circuit Iss 2B Dwg 2B
CD-5D192-01 1 633.15 KB 5ESS Switching Equipment - Integrated Services Line Unit 2 Circuit Iss 1 Dwg 1
CD-5D194-01 1 63.35 KB 5ESS Switching Equipment - Fuse / Filter Unit Model 5 Circuit Iss 1 Dwg 1
CD-5D195-01 1 2.94 MB 5ESS Switching Equipment - Switch Module Processor Model 4 (SMPU4) Circuit Iss 1 Dwg 1; App 1M Dwg 2M; App 2B Dwg 3B
CD-5D196-01 2B 2.03 MB 5ESS Switching System - Time Slot Interchange Unit Model 4 (TSIU4) Circuit Iss 2B Dwg 2B; App 1M Dwg 3M; App 2B Dwg 4B
CD-5D197-01 1 235.25 KB 5ESS Switching Systems - Digital Service Unit Model 3 Circuit Iss 1 Dwg 1; App 1M Dwg 2M
CD-5D201-01 2B 389.64 KB Electronic Switching Systems - 5ESS Switching Equipment - Digital Carrier Line Unit Circuit Iss 2B Dwg 4B; App 1D Dwg 5D; App 2AC Dwg 6AC; App 3A Dwg 7A; App 4B Dwg 8B; App 5B Dwg 9B; App 6M Dwg 10M; App 7M Dwg 11M; App 8B Dwg 12B
CD-5D202-01 2A 1.78 MB Electronic Switching Systems - 5ESS Switching Equipment - Digital Carrier Line Unit Circuit Iss 2A Dwg 2A; App 1M Dwg 3M; App 2B Dwg 4B
CD-5D202-02 1 89.51 KB Electronic Switching Systems - 5ESS Switching Equipment - Digital Carrier Line Unit Circuit Iss 1 Dwg 1; App 1B Dwg 2B
CD-5D203-01 1 98.22 KB Electronic Switching Systems - 5ESS Switching Equipment - Digital Carrier Line Unit-Supplement Circuit Iss 1 Dwg 1; App 1M Dwg 2M; App 2B Dwg 3B
CD-5D203-02 1 83.38 KB Electronic Switching Systems - 5ESS Switching Equipment - Digital Carrier Line Unit-Supplement Circuit Iss 1 Dwg 1; App 1 Dwg 2B
CD-5D204-01 1 180.48 KB 5ESS Switching Equipment - Digital Line Trunk Unit - Remote Integrated Services Line Unit Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2B Dwg 3B; App 3B Dwg 4B; App 4B Dwg 5B
CD-5D205-01 2B 119.01 KB 5ESS Switching Equipment - Digital Line Trunk Unit Model 2 Iss 2B Dwg 4B; App 1B Dwg 5B
CD-5D300-01 2D 256.24 KB Electronic Switching Systems - 5ESS - Trunk Unit Circuit Iss 2D Dwg 5D; App 1A Dwg 6A; App 2D Dwg 7D; App 3AC Dwg 8AC; App 4AC Dwg 9AC
CD-5D301-01 1 850.82 KB 5ESS Switching Equipment - IDCU Integrated Digital Carrier Unit Circuit Iss 1 Dwg 1; App 1M Dwg 2M
CD-5D401-01 1 679.47 KB 5ESS Switching Equipment - Facilities Interface Unit Model 2 Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2AC Dwg 3AC; App 3A Dwg 4A; App 4AC Dwg 5AC; App 5A Dwg 6A; App 6M Dwg 7M; App 7B Dwg 8B
CD-5D401-02 1 518.98 KB 5ESS Switching Equipment - Facilities Interface Unit Model 3 Unit App 2M Dwg 3M; App 3A Dwg 4A; App 4B Dwg 5B
CD-5D500-01 1 156.91 KB Electronic Switching Equipment - 5ESS/International - Power Line Filter Unit Circuit Iss 1 Dwg 1
CD-5D501-01 1 108.79 KB 5ESS Switching Equipment - Digital Line and Trunk Unit Model 3 Iss 1 Dwg 1; App 1B Dwg 2B
CD-5D502-01 1 64.81 KB Electronic Switching Systems - 5ESS - Switch Communications Adapter Translator - Application Processor Application Schematic Iss 1 Dwg 1
CD-5D503-01 1 134.05 KB 5ESS Switching Equipment - Enhanced 911 Service Adjunct (ESA) Circuit Iss 1 Dwg 1; App 1M Dwg 2M; App 3B Dwg 4B
CD-5D503-02 2M 146.61 KB 5ESS Switching Equipment - Enhanced 911 Service Adjunct (ESA) Circuit (Single and Multiple Switch Applications) Iss 2M Dwg 10M; App 1M Dwg 11M
CD-5D505-01 1 109.22 KB Electronic Switching Systems - 5ESS - Advanced Communication Package Version 7 Application Schematic Iss 1 Dwg 1; App 1M Dwg 2M
CD-5D507-01 1 143.86 KB 5ESS Switching Equipment - OSPS-AP Cluster Cabinet Circuit Iss 1 Dwg 1; App 1M Dwg 2M
CD-5D508-01 1 452.97 KB 5ESS Switching Equipment - Message Switch Control Unit Model 3 Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2M Dwg 3M
CD-5D511-01 1 54.60 KB Electronic Switching Systems - 5ESS - Micro Electronic Directory System - Application Processor Application Schematic Iss 1 Dwg 1
CD-5D513-01 1 946.19 KB 5ESS Switching Systems - Communications Module Unit Circuit Iss 1 Dwg 1; App 1A Dwg 2A; App 2M Dwg 3M; App 3M Dwg 4M; App 4B Dwg 5B
CD-5D515-01 1 216.31 KB International 5ESS Switching Equipment - Mesh Earthing Building Circuit Iss 1 Dwg 1
CD-5D517-01 1 188.21 KB 5ESS Switching Equipment - Remote Line Group Unit Circuit Iss 1 Dwg 1
CD-5D518-01 1 171.48 KB 5ESS Switching Systems - Switching Module 2000 Application Schematic Iss 1 Dwg 1; App 1B Dwg 2B
CD-5D519-01 1 189.89 KB 5ESS Switching Equipment - Application Schematic for the 5ESS-2000 Switch (Administrative Workstation and Very Compact Digital Exchange) Iss 1 Dwg 1; App 1M Dwg 2M; App 2M Dwg 3M; App 3M Dwg 4M
CD-5D523-01 1 1.31 MB 5ESS Switching Equipment - Packet Switch Unit Model 2 Iss 1 Dwg 1
CD-5D524-01 1 41.57 KB Electronic Switching Systems - 5ESS - Ovation Voice Processing System Application Schematic Iss 1 Dwg 1
CD-5D525-01 1 152.83 KB 5ESS Switching Equipment - Digital Network Unit-SONET (DNU-S) Circuit Iss 1 Dwg 1
CD-5D527-01 1 41.66 KB Electronic Switching Systems - 5ESS - Intelligent Network Application Schematic Iss 1 Dwg 1
CD-5D530-01 1 356.76 KB 5ESS Switching Equipment - Combined Services Unit Circuit App 1B Dwg 2B
CD-5D534-01 1 186.56 KB 5ESS Switching Systems - Administrative Workstation / Switching Module 2000 Application Schematic Iss 1 Dwg 1
CD-5D536-01 1 2.07 MB 5ESS Switching Equipment - Module Controller and Time Slot Interchanger Unit Model 3 Circuit Iss 1 Dwg 1
CD-5E001-01 1 1.79 MB PBX Systems - Trunk Circuit to Central Office for No. 701A, 701B, 701PK, 702A, 711A, 711B, 711PK or 740E or Two-Way - Manual and Dial Selected for No. 701A, 701B, 701PK or 740E or Two-Way - Manual Selected for No. 800A Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D; App 4AC Dwg 4AC
CD-5E001-01 3B 7.95 MB PBX Systems - Trunk Circuit to Central Office for No. 701A, 701B, 701PK, 702A, 711A, 711B, 711PK, 740E or 756A or Two-Way-Manual and Dial Selected for No. 701A, 701B, 701PK or 740E or Two-Way-Manual Selected for No. 800A Iss 3B Dwg 10B; App 1D Dwg 11D
CD-5E003-01 1 699.52 KB PBX Systems - No. 756A - Inward Restriction Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D
CD-5E021-01 2D 2.01 MB PBX Systems - No. 756A - Station Message Register Pulse and Surcharge Circuit Iss 2D Dwg 4D; App 1B Dwg 5B; App 2A Dwg 6A; App 3D Dwg 7D
CD-5E029-01 2D 2.10 MB PBX Systems - No. 756A - Make Busy & Busy Display Circuit Iss 2D Dwg 5D; App 1D Dwg 6D
CD-5E037-01 1 597.27 KB PBX Systems - Voltage Reduction Detector at Midpoint of Voltage Divider Network Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D
CD-5X201-01 1 2.15 MB 5ESS Switching Equipment - Global Digital Service Unit - Export Circuit Iss 1 Dwg 1; App 2B Dwg 3B; App 3A Dwg 4A; App 4B Dwg 5B; App 5B Dwg 6B
CD-5X202-01 1 152.81 KB 5ESS Export - Periodic Pulse Metering Circuit Iss 1 Dwg 1
CD-5X204-01 1 268.51 KB Electronic Switching Systems - 5ESS Switching Equipment - Digital Line Trunk Unit - Export Circuit Iss 1 Dwg 1; App 2B Dwg 3B
CD-5X205-01 1 535.40 KB 5ESS Switching Equipment - Line Unit Model 2 Export Circuit Iss 1 Dwg 1; App 1AC Dwg 2AC; App 2A Dwg 3A
CD-5X213-01 2M 369.98 KB 5ESS Switching Equipment - Echo Canceler Signaling Unit Circuit Iss 2M Dwg 2M
CD-5X214-01 1 189.80 KB Electronic Switching Systems - 5ESS Operator Services Position System (OSPS) International Application Schematic Iss 1 Dwg 1; App 1B Dwg 2B; App 2B Dwg 3B; App 3M Dwg 4M; App 4B Dwg 5B; App 5M Dwg 6M; App 6B Dwg 7B; App 7B Dwg 8B; App 8AC Dwg 9AC
CD-5X214-01 2B 84.57 KB Electronic Switching Systems - 5ESS Operator Services Position System (OSPS) International Application Schematic Iss 2B Dwg 10B; App 1B Dwg 11B; App 2B Dwg 12B; App 3B Dwg 13B
CD-5X215-02 1 167.32 KB 5ESS Switching Equipment - Export Dataset Cabinet Application Schematic Circuit Iss 1 Dwg 1; App 1M Dwg 2M; App 2B Dwg 3B; App 3A Dwg 4A; App 4B Dwg 5B; App 5B Dwg 6B
CD-5X220-01 1 114.29 KB 5ESS Switching Equipment - International Modem Pooling Cabinet Application Schematic Iss 1 Dwg 1
CD-5X221-01 1 322.17 KB 5ESS Switching Equipment - Digital Conference Switching System Cabinet Circuit Iss 1 Dwg 1; App 1M Dwg 2M; App 2B Dwg 3B; App 3B Dwg 4B
CD-5X224-01 1 33.62 KB 5ESS Switching Equipment - Digital Test Access Circuit App 1M Dwg 2M; App 2M Dwg 3M
CD-62440-01 31 561.94 KB Toll Systems - Switchboard No. 3 and Tandem Switchboard No 3 - Key Sheet Iss 31 Dwg 31
CD-62831-01 8D 780.77 KB Toll Systems - Toll Switchboard No. 3, 3C, 3CL or 3CF - Tone Jack Circuit Iss 8D Dwg 15D; App 1B Dwg 16B
CD-64098-01 3B 741.41 KB Toll Systems - Transmission Measuring - 1U Amplifier Rectifier with Battery Supply Iss 3B Dwg 15B; App 1B Dwg 16B
CD-64741-01 3D 573.70 KB Toll Systems - Toll Switchboard No. 3C, 3CL or 3CF - Toll Testboard No. 17B or 18B - Position Dial Circuit for Repeated Dialing Arranged for Reassociation of Dial Ckt. And for Automatic Start of Ringing Iss 3D Dwg 16D; App 1D Dwg 17D; App 2D Dwg 18D
CD-64800-01 15 407.23 KB Toll Systems - Toll Switchboard No. 3C or 3CL - Keysheet Iss 15 Dwg 15
CD-65657-01 11AC 5.77 MB PBX Systems - No. 701A, 701B, 701PK, 702A, 711A, 711B, 711PK or 740E - One-Way Trunk Circuit to Central Office - Outgoing Dial Selected - or No. 701A, 701B, 701PK, or 740E - Two-Way Trunk Circuit to Central Office - Manual and Dial Selected Iss 11AC Dwg 24AC; App 1D Dwg 25D; App 2D Dwg 26D; App 3D Dwg 27D; App 4AC Dwg 28AC; App 5D Dwg 29D
CD-65677-01 4D 319.32 KB PBX Systems - Test Terminal Circuit for Battery and Ground Iss 4D Dwg 5D; App 1D Dwg 6D
CD-65680-01 13D 849.85 KB PBX Systems - No. 507A or 507B - Station Line, Trunk, Connecting, Telephone, Ringing, Buzzer and 2 Way Ringdown Tie Trunk Circuits Arranged for Use with Manual or Dial Central Offices Iss 13D Dwg 13D
CD-65718-01 10B 17.02 MB PBX Systems - Tie Trunk Circuit - No. 552A, 552D, 556A, 605A, 606A, 606B, 607A, 607B, 608A, 608B, 608D, 701A, 701B, 701PK, 702A, 711A, 711B, 711PK, 740E, 756A, 757A, or 800A - Outgoing Manual and Dial Selected and Dial Repeating Incoming Pulse Correcting with or without E and M Lead Supervision Iss 10B Dwg 28B
CD-65718-01 9AC 14.13 MB PBX Systems - Tie Trunk Circuit - No. 552A, 552D, 556A, 605A, 606A, 606B, 607A, 607B, 608A, 608B, 608D, 701A, 701B, 701PK, 702A, 711A, 711B, 711PK, 740E, 756A, 757A or 800A - Outgoing Manual and Dial Selected and Dial Repeating Incoming Pulse Correcting with or without E and M Lead Supervision Iss 9AC Dwg 21AC; App 1D Dwg 22D; App 2AC Dwg 23AC; App 3D Dwg 24D; App 4B Dwg 25B
CD-65719-01 6D 831.66 KB PBX Systems - No. 550B, 550C, 550SC, 551A, 551B, 551D, 552A, 552B, 552D, 552E, 555, 556A, 605A, 606B, 607A, 607B, or 608A - Manual Conference Circuit with Voice Repeater Arranged for a Maximum of 4 or 5 Simultaneous Connections (Man Conf) Iss 6D Dwg 6D; App 1D Dwg 7D
CD-65719-01 8D 620.76 KB PBX Systems - No. 550B, 550C, 550SC, 551A, 551B, 551D, 552A, 552B, 552D, 552E, 555, 556A, 605A, 606B, 607A, 607B, or 608A - Manual Conference Circuit with Voice Repeater Arranged for a Maximum of 4 or 5 Simultaneous Connections App 1D Dwg 10D
CD-65729-01 11A 177.44 KB PBX Systems - No. 557B - Secretarial Line and Central Office Trunk Circuits Iss 11A Dwg 17A; App 1B Dwg 18B
CD-65731-01 12B 19.17 KB PBX Systems - No. 557B - Cord, Telephone, Dial, Auxiliary Signal, Station Line, Ringing and Battery, Fuse Alarm, Station Conference Position Splitting and Grouping Circuits App 6A Dwg 18A
CD-65731-01 14A 175.88 KB PBX Systems - No. 557B - For Telephone Answering Service Position and Station Circuits Iss 14A Dwg 21A; App 1B Dwg 22B
CD-65733-01 5D 304.59 KB PBX Systems - No. 507A or 507B - 2 Way Automatic Tie Trunk Circuit Iss 5D Dwg 5D
CD-65741-01 5D 5.91 MB PBX Systems - No. 756A - Line, Link and Marker Circuit Iss 5D Dwg 23D; App 1D Dwg 24D; App 2D Dwg 25D; App 3AC Dwg 26AC
CD-65741-01 9D 19.20 MB PBX Systems - No. 756A - Line, Link and Marker Circuit Iss 9D Dwg 46D; App 1D Dwg 47D; App 2B Dwg 48B; App 3A Dwg 49A; App 4B Dwg 50B; App 5B Dwg 51B; App 6D Dwg 52D; App 7D Dwg 53D
CD-65742-01 12B 1.49 MB PBX Systems - No. 756A - Dial Pulse Register Circuit Iss 12B Dwg 18B; App 1B Dwg 19B; App 2B Dwg 20B; App 3B Dwg 21B; App 4D Dwg 22D; App 5AC Dwg 23AC
CD-65742-01 14D 4.03 MB PBX Systems - No. 756A - Dial Pulse Register Circuit Iss 14D Dwg 30D; App 1D Dwg 31D; App 2D Dwg 32D
CD-65744-01 1 932.38 KB PBX Systems - No. 756A - Traffic Register Circuit for Internal Traffic and Trouble Registers Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D
CD-65745-01 5AC 611.75 KB PBX Systems - No. 756A - Dial Conference Circuit Arranged for a Maximum of 5 Simultaneous Connections Iss 5AC Dwg 5AC; App 1D Dwg 6D
CD-65746-01 2B 1021.88 KB PBX Systems - No. 756A - PBX Cabling Diagram Iss 2B Dwg 3B; App 10D Dwg 13D; App 11B Dwg 14B; App 12D Dwg 15D; App 13B Dwg 16B; App 14D Dwg 17D; App 15B Dwg 18B; App 16B Dwg 19B; App 17B Dwg 20B; App 18D Dwg 21D; App 19AC Dwg 22AC; App 1B Dwg 4B; App 20B Dwg 23B; App 21D Dwg 24D; App 22D Dwg 25D; App 23D Dwg 26D; App 24D Dwg 27D; App 2D Dwg 5D; App 3D Dwg 6D; App 4B Dwg 7B; App 5B Dwg 8B; App 6D Dwg 9D; App 7D Dwg 10D; App 8B Dwg 11B; App 9D Dwg 12D
CD-65746-01 3D 288.27 KB PBX Systems - No. 756A - PBX Cabling Diagram Iss 3D Dwg 41D; App 10B Dwg 51B; App 11B Dwg 52B; App 12D Dwg 53D; App 1B Dwg 42B; App 2B Dwg 43B; App 3A Dwg 44A; App 4A Dwg 45A; App 5B Dwg 46B; App 6D Dwg 47D; App 7B Dwg 48B; App 8D Dwg 49D; App 9D Dwg 50D
CD-65746-01 4D 571.80 KB PBX Systems - No. 756A - PBX Cabling Diagram Iss 4D Dwg 54D; App 1D Dwg 55D; App 2D Dwg 56D
CD-65747-01 7D 899.46 KB PBX Systems - No. 558A System, 756A, 800A, 801A, 812A PBX or Switching System No. 400 - Loudspeaker Paging Trunk Circuit Iss 7D Dwg 10D; App 1D Dwg 11D; App 2D Dwg 12D
CD-65750-01 4B 460.63 KB PBX Systems - No. 756A - Junctor Circuit Iss 4B Dwg 5B; App 1B Dwg 6B; App 2D Dwg 7D; App 3D Dwg 8D
CD-65750-01 5D 1002.47 KB PBX Systems - No. 756A - Junctor Circuit Iss 5D Dwg 10D
CD-65752-01 11D 3.86 MB PBX Systems - No. 756A - Two Way Trunk Circuit to Central Office Iss 11D Dwg 18D
CD-65752-01 13B 10.59 MB PBX Systems - No. 756A - Two-Way Trunk Circuit to Central Office Iss 13B Dwg 35B; App 1A Dwg 36A; App 2B Dwg 37B; App 3B Dwg 38B; App 4B Dwg 39B; App 5B Dwg 40B; App 6D Dwg 41D; App 7D Dwg 42D; App 8D Dwg 43D
CD-65753-01 7B 800.38 KB PBX Systems - No. 756A - Attendant Trunk Circuit Iss 7B Dwg 11B; App 1B Dwg 12B; App 2D Dwg 13D
CD-65753-01 8D 2.42 MB PBX Systems - No. 756A - Attendant Trunk Circuit Iss 8D Dwg 18D; App 1D Dwg 19D; App 2D Dwg 20D; App 3D Dwg 21D
CD-65754-01 3D 696.65 KB PBX Systems - No. 756A - Busy Tone Trunk Circuit Iss 3D Dwg 5D; App 1D Dwg 6D; App 2D Dwg 7D
CD-65756-01 5D 3.82 MB PBX Systems - No. 756A - Tie Trunk Circuit - Outgoing Manual and Dial Selected with 2 Second Ringing Signal - Incoming Ringdown Iss 5D Dwg 8D; App 1D Dwg 9D; App 2D Dwg 10D
CD-65757-01 5B 1.23 MB PBX Systems - No. 756A - Cordless Position Circuit Iss 5B Dwg 6B; App 1D Dwg 7D; App 2D Dwg 8D; App 3D Dwg 9D
CD-65757-01 6D 3.19 MB PBX Systems - No. 756A - Cordless Position Circuit Iss 6D Dwg 14D; App 1D Dwg 15D; App 2D Dwg 16D; App 3D Dwg 17D
CD-65761-01 12B 978.42 KB PBX Systems - No. 701B, 701PK, 711B, or 711PK - Miscellaneous Alarm Circuit Iss 12B Dwg 26B; App 1D Dwg 27D
CD-65761-02 1 6.45 MB PBX Systems - No. 701B or 711B - Miscellaneous Alarm Circuit Iss 1 Dwg 1; App 1B Dwg 2B; App 2D Dwg 3D; App 3D Dwg 4D
CD-65771-01 7D 1.40 MB PBX Systems - No. 552A, 552B, 552D, 552E, 605A, 607A, 607B, 701B, 701PK, 711B or 711PK - Ringing Leads Circuit Iss 7D Dwg 11D; App 1D Dwg 12D; App 2D Dwg 13D; App 3D Dwg 14D
CD-65773-01 5D 104.85 KB PBX Systems - No. 552A, 552D, 556A, 605A, 608A, 701B, 711B, or 740E - Battery Cut-Off Circuit Iss 5D Dwg 6D
CD-65774-01 4D 542.53 KB PBX Systems - No. 701B, 701PK, 711B or 711PK - Traffic Register Circuit - No. 607A, 607B or 608A - Switchboard Peg Count Circuit Iss 4D Dwg 9D
CD-65778-01 4D 312.95 KB PBX Systems - No. 552A, 552B, 552D, 552E, 605A, 607A, 607B, or 608A - Jack Circuit for Attendant Switchboard Positions Iss 4D Dwg 6D; App 1D Dwg 7D
CD-65779-01 5B 817.79 KB PBX Systems - Fuse Alarm Circuit for Relay Rack or Apparatus Cabinet Mounted Equipment - Dial or Manual PBX Iss 5B Dwg 7B
CD-65786-01 2D 1.16 MB P.B.X. Systems - No. 552A, 552B, 552D or 552E - Auxiliary Signal, Battery Cut-Off, Buzzer, Fuse Alarm and Night Alarm Circuit Iss 2D Dwg 2D; App 1D Dwg 3D; App 2D Dwg 4D; App 3D Dwg 5D
CD-65787-01 1 1.36 MB PBX Systems - No. 552A, 552B, 552D, 552E, or 605A - Attendant Telephone and Dial Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D; App 6D Dwg 7D
CD-65792-01 5B 3.75 MB PBX Systems - No. 700C, 701A, 701B, or 702A - Incoming Trunk Circuit for Inward Dialing from Step-by-Step or Crossbar Tandem Office or Distant PBX Arranged to Transfer Calls to PBX Attendant Iss 5B Dwg 10B; App 1B Dwg 11B; App 2D Dwg 12D
CD-65799-01 1 1.17 MB PBX Systems - No. 701A, 701B or 740E - Auxiliary Line Circuit for Use Between Selector Bank Multiple and Station Line Circuit to Provide for Single Digit Access to the Associated Stations Iss 1 Dwg 1; App 1B Dwg 2B
CD-65816-01 6AC 1.33 MB PBX Systems - No. 701B - Register Sender Circuit Arranged to Convert 2 out of 5 Ground Pulses to Dial Pulses Iss 6AC Dwg 12AC; App 1D Dwg 13D
CD-65901-01 4D 4.30 MB PBX Systems - No. 701A, 701B, 701PK, 702A, 711A, 711B or 711PK - Line or Trunk Finder Circuit with Associated Common Group and Subgroup Circuit for Line Finder Applications Arranged for Restricted Service App 8D Dwg 17D; App 9B Dwg 18B
CD-65901-01 5B 3.89 MB PBX Systems - No. 701A, 701B, 701PK, 702A, 711A, 711B or 711PK - Line or Trunk Finder Circuit with Associated Common Group and Subgroup Circuit for Line Finder Applications Arranged for Restricted Service Iss 5B Dwg 19B; App 1D Dwg 20D
CD-65910-02 1D 196.01 KB PBX Systems - No. 756A - Current Drain Data Iss 1D Dwg 2D; App 1D Dwg 3D
CD-65942-01 3B 1.15 MB PBX Systems - No. 756A - Auxiliary Relay Circuit for Direct Station Selection from Stations Iss 3B Dwg 6B; App 1B Dwg 7B; App 2D Dwg 8D
CD-66010-01 4D 972.41 KB PBX Systems - No. 701A, 701B, 711A or 711B - Second Selector Circuit Iss 4D Dwg 23D
CD-66011-01 3D 2.56 MB PBX System - No. 552A, 605A or 701A - Cord Circuit for Use in Multiple or Nonmultiple Switchboards Iss 3D Dwg 3D; App 1D Dwg 4D; App 2D Dwg 5D
CD-66016-01 1931-06-19 1 2.27 MB P.B.X. Systems - No. 605-A, 701-A, or 711-A - Ringing Leads Circuit Iss 1 Dwg 1; App 1A Dwg 2A; App 2D Dwg 3D; App 3D Dwg 4D; App 4D Dwg 5D
CD-66018-01 1933-11-20 2A 2.04 MB P.B.X. Systems - No. 605-A or 701-A - Night Alarm Circuit for Use in Multiple Switchboard Iss 2A Dwg 2A; App 1D Dwg 3D; App 2D Dwg 4D; App 3A Dwg 5A
CD-66019-01 1931-07-08 3D 2.56 MB P.B.X. Systems - No. 605-A - Fuse and Power Alarm Circuit Iss 3D Dwg 3D; App 1A Dwg 4A; App 2D Dwg 5D
CD-66020-01 1 3.72 MB P.B.X. Systems - No. 552-D, 552-E, 605-A or 701-A - Station Line Circuit for Multiple Switchboard with or without Line Relay Iss 1 Dwg 1; App 10D Dwg 11D; App 11D Dwg 12D; App 12D Dwg 13D; App 1A Dwg 2A; App 2D Dwg 3D; App 3D Dwg 4D; App 4D Dwg 5D; App 5A Dwg 6A; App 6D Dwg 7D; App 7D Dwg 8D; App 8B Dwg 9B; App 9D Dwg 10D
CD-66034-01 2D 1.45 MB PBX Systems - No. 701A or 740E - Intercepting Trunk Circuit from Connector Terminals Iss 2D Dwg 8D; App 1D Dwg 9D; App 2D Dwg 10D; App 3D Dwg 11D; App 4D Dwg 12D; App 5D Dwg 13D; App 6D Dwg 14D; App 7D Dwg 15D; App 8D Dwg 16D
CD-66035-01 5D 1.42 MB P.B.X. Systems - No. 701A or 740E - Trunk Circuit to P.B.X. Attendant from Selector Levels for Use on Calls to Attendant from Dial Stations or for Use with One Way Toll Diverting Trunks to Panel Office Iss 5D Dwg 15D; App 1D Dwg 16D; App 2D Dwg 17D; App 3D Dwg 18D; App 4D Dwg 19D; App 5D Dwg 20D
CD-66036-01 9D 626.04 KB P.B.X. Systems - No. 552A, 552D, 556A, 605A, 701A, 740E or 740AX - Battery Cut-Off Circuit Iss 9D Dwg 19D; App 1D Dwg 20D; App 2D Dwg 21D
CD-66037-01 5D 1.03 MB PBX Systems - No. 701A, 701B, 701PK, 711A, 711B, or 711PK - Test Line Circuit for Testing Connector and Selector Connector Circuits Iss 5D Dwg 18D; App 1D Dwg 19D; App 2B Dwg 20B; App 3D Dwg 21D; App 4D Dwg 22D; App 5D Dwg 23D; App 6AC Dwg 24AC; App 7D Dwg 25D
CD-66037-01 6D 810.84 KB PBX Systems - No. 701A, 701B, 701PK, 711A, 711B, or 711PK - Test Line Circuit for Testing Connector and Selector Connector Circuits Iss 6D Dwg 26D; App 1D Dwg 27D
CD-66073-01 17B 503.30 KB PBX systems - No. 701A, 701B, 711A, 711B, 740A, 740B, 740C or 740E - Test Set Circuit for Testing Line Finder, Trunk Finder, Connector, Selector and Selector Connector Circuits Iss 17B Dwg 17B; App 1D Dwg 18D
CD-66129-01 3D 1.79 MB PBX Systems - No. 605A or 701A - Attendant's Telephone and Dial Circuit Iss 3D Dwg 13D
CD-66137-01 4D 7.37 MB P.B.X. Systems - No. 606B, 701A, or 711A - Miscellaneous Alarm Circuit Iss 4D Dwg 10D; App 1D Dwg 11D; App 2D Dwg 12D; App 3D Dwg 13D
CD-66142-01 15D 1.50 MB P.B.X. Systems - P.B.X. No. 740A, 740B or 740C - Selector Connector Circuit - Regular - Arranged for Restricted Service and for Completing Incoming Trunk Calls Iss 15D Dwg 15D
CD-66144-01 6D 583.52 KB PBX Systems - No. 701A, 701B, 711A, 711B or 740E - Connector Circuit - Rotary Hunting - One Ring Iss 6D Dwg 22D
CD-66144-01 7D 2.51 MB PBX Systems - No. 701A, 701B, 701PK, 711A, 711B, 711PK, or 740E - Connector Circuit - Rotary Hunting - One Ring Iss 7D Dwg 23D; App 1D Dwg 24D; App 2D Dwg 25D; App 3D Dwg 26D; App 4AC Dwg 27AC; App 5AC Dwg 28AC; App 6D Dwg 29D; App 7D Dwg 30D; App 8D Dwg 31D; App 9B Dwg 32B
CD-66151-01 1935-01-04 7D 799.14 KB PBX Systems - No. 750A - Trunk Circuit to Central Office Iss 7D Dwg 7D
CD-66151-01 11D 93.20 KB PBX Systems - No. 750A - Trunk Circuit to Central Office Iss 11D Dwg 11D
CD-66159-01 1931-12-29 10D 1.03 MB P.B.X. Systems - No. 750A - Line and Link Circuit Iss 10D Dwg 10D
CD-66159-01 16D 119.47 KB P.B.X. Systems - No. 750A - Line and Link Circuit Iss 16D Dwg 16D
CD-66160-01 1931-10-23 5D 52.40 KB P.B.X. Systems - No. 750-A - Station Circuit Iss 5D Dwg 5D
CD-66161-01 14D 109.32 KB P.B.X. Systems - No. 750A - Tone, Ringing and Alarm Circuits and Common Timing Circuit Iss 14D Dwg 14D
CD-66197-01 14D 315.52 KB P.B.X. Systems - Grounding Circuit Iss 14D Dwg 18D; App 1D Dwg 19D
CD-66198-01 1 2.91 MB PBX Systems - No. 552A, 552B, 552D, 552E, 605A, or 701A - Cord Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D; App 4D Dwg 5D; App 5D Dwg 6D; App 6 Dwg 7; App 7D Dwg 8D; App 8D Dwg 9D
CD-66273-01 1 766.15 KB PBX Systems - No. 552A, 552B, 552D, 552E or 605A - Position Grouping Key Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D; App 4D Dwg 5D; App 5D Dwg 6D
CD-66359-01 4B 1.81 MB PBX Systems - No. 701A, 701B, 701PK, 711A, 711B, 711PK or 740E - First Selector Circuit Arranged for Restricted Service Iss 4B Dwg 21B; App 1D Dwg 22D; App 2D Dwg 23D; App 3D Dwg 24D; App 4D Dwg 25D
CD-66360-01 5D 1.84 MB PBX Systems - No. 701A, 701B, 701PK, 711A, 711B, 711PK or 740E - Incoming First Selector Circuit Arranged for Operation with Dial Repeating Tie Trunks or Incoming Trunks for Inward Dialing Iss 5D Dwg 22D; App 1D Dwg 23D; App 2D Dwg 24D; App 3AC Dwg 25AC; App 4D Dwg 26D; App 5D Dwg 27D; App 6D Dwg 28D; App 7B Dwg 29B
CD-66361-01 1935-02-18 3D 185.96 KB P.B.X. Systems - No. 750A - Emergency Transfer Key Circuit Iss 3D Dwg 3D
CD-66425-01 3D 1.82 MB P.B.X. Systems - No. 552A, 552B, 552D, 552E, 605A or 701A - Attendants Telephone and Dial Circuit Iss 3D Dwg 7D; App 1D Dwg 8D; App 2B Dwg 9B; App 3D Dwg 10D; App 4D Dwg 11D; App 5D Dwg 12D
CD-66437-01 1932-04-18 2D 576.64 KB P.B.X. Systems - No. 750-A - Station Circuit Iss 2D Dwg 2D
CD-66437-01 4D 92.50 KB P.B.X. Systems - No. 750A - Station Circuit Iss 4D Dwg 4D
CD-66438-01 1936-07-09 4D 838.01 KB P.B.X. Systems - No. 750A - Tone, Ringing, Alarm and Common Timing Systems Iss 4D Dwg 4D
CD-66438-01 7D 124.40 KB P.B.X. Systems - P.B.X. No. 750A - Tone, Ringing, Alarm and Common Timing Circuits Iss 7D Dwg 7D
CD-66462-01 3D 828.67 KB PBX Systems - No. 552A, 552B, 552E, 556A, 605A or 608A - Manual Conference Circuit Arranged for a Maximum of 4 or 5 Simultaneous Connections Iss 3D Dwg 9D; App 1D Dwg 10D; App 2D Dwg 11D; App 3D Dwg 12D
CD-66503-01 3D 341.39 KB PBX Systems - No. 755A - Trunk Circuit Iss 3D Dwg 7D; App 1B Dwg 8B; App 2D Dwg 9D; App 3D Dwg 10D; App 4D Dwg 11D
CD-66504-01 7D 466.69 KB PBX System - No. 755A - Line, Line Switch, and Call Allotter Circuit Iss 7D Dwg 21D
CD-66506-01 5D 624.33 KB PBX Systems - No. 755A - Tone, Ringing, Alarm and Common Timing Circuit Iss 5D Dwg 6D; App 1D Dwg 7D; App 2D Dwg 8D; App 3D Dwg 9D; App 4D Dwg 10D; App 5B Dwg 11B; App 6D Dwg 12D; App 7D Dwg 13D
CD-66507-01 7D 194.73 KB P.B.X. Systems - No. 755A - Station Circuit with Emergency Transfer Key and Control Key Circuit Iss 7D Dwg 10D
CD-66507-01 13D 174.46 KB P.B.X. Systems - No. 755A - Station Circuit with Emergency Transfer Key and Control Key Circuit Iss 13D Dwg 13D
CD-66574-01 4D 781.56 KB PBX Systems - No. 552A, 552D, 605A, or 701A - Cord and Dial Circuits - Modification of Existing Circuits to Extend Trunk and Station Range and to Remove Ringing Bridge Iss 4D Dwg 5D; App 1D Dwg 6D
CD-66611-01 2D 390.29 KB PBX Systems - No. 755A - Link and Link Allotter Circuit Iss 2D Dwg 7D
CD-66715-01 6D 1.31 MB PBX Systems - No. 701B, 701PK, 711B or 711PK - Station Line Circuit - Individual or 2 Party Selective Ringing with or without Restricted Service Iss 6D Dwg 15D; App 1D Dwg 16D; App 2D Dwg 17D; App 3D Dwg 18D; App 4D Dwg 19D
CD-66716-01 4D 1.15 MB PBX Systems - No. 701A, 701B, 701PK or 740E - Intercepting Trunk Circuit from Vacant Selector Levels - Attendant Trunk Circuit for Use Where Tie Trunk Circuits are Connected to Station Line Circuits, Incoming Selector, or Selector Connector Circuits Iss 4D Dwg 4D; App 1D Dwg 5D; App 2D Dwg 6D; App 3D Dwg 7D; App 4D Dwg 8D; App 5D Dwg 9D
CD-66717-01 6D 1.28 MB PBX Systems - No. 701A, 701B, 701PK or 740E - Attendant Trunk Circuit from Selector or Selector Connector Levels Iss 6D Dwg 9D; App 1D Dwg 10D; App 2D Dwg 11D; App 3D Dwg 12D; App 4D Dwg 13D; App 5D Dwg 14D
CD-66796-01 2D 617.48 KB PBX Systems - No. 756A - Alarm, Transfer & Test Circuit Iss 2D Dwg 4D
CD-66796-01 4B 1.41 MB PBX Systems - No. 756A - Alarm, Transfer and Test Circuit Iss 4B Dwg 14B; App 1D Dwg 15D; App 2D Dwg 16D
CD-66892-01 2A 1.42 MB PBX Systems - 701A, 701B, 711A, 711B or 740E - "TOUCH-TONE" to Dial Pulse Solid State Converter Circuit - 14 Digits Iss 2A Dwg 2A; App 1B Dwg 3B; App 2A Dwg 4A; App 3B Dwg 5B
CD-66902-01 2D 6.34 MB PBX Systems - No. 756A - Dial Conference Trunk Circuit - Station Controlled Iss 2D Dwg 5D; App 1D Dwg 6D; App 2A Dwg 7A; App 3D Dwg 8D; App 4B Dwg 9B; App 5D Dwg 10D
CD-66908-01 2A 3.42 MB PBX Systems - No. 756A - Dial Conference Trunk Circuit - Attendant Controlled Iss 2A Dwg 4A; App 1B Dwg 5B; App 2B Dwg 6B; App 3B Dwg 7B; App 4D Dwg 8D
CD-66909-01 2D 1.88 MB PBX Systems - No. 756A - Station Dial Transfer Controller Circuit Iss 2D Dwg 6D; App 1B Dwg 7B; App 2D Dwg 8D
CD-66910-01 2D 2.07 MB PBX Systems - No. 756A - Auxiliary Position Circuit for Remote Answering of Trunks and Inward Completion By Any Station Iss 2D Dwg 5D; App 1D Dwg 6D
CD-66911-01 3D 1.28 MB PBX Systems - No. 756A - Busy Verification Auxiliary Trunk Circuit Iss 3D Dwg 7D; App 1D Dwg 8D
CD-66920-01 1 165.15 KB PBX Systems - No. 756A - Feature Cabling Diagram Iss 1 Dwg 1; App 1B Dwg 2B; App 2D Dwg 3D; App 3D Dwg 4D; App 4D Dwg 5D; App 5AC Dwg 6AC
CD-66920-01 2D 93.78 KB PBX Systems - No. 756A - Feature Cabling Diagram Iss 2D Dwg 15D; App 1D Dwg 16D; App 2D Dwg 17D; App 3D Dwg 18D; App 4D Dwg 19D
CD-66920-01 3D 378.01 KB PBX Systems - No. 756A - Feature Cabling Diagram Iss 3D Dwg 20D; App 1D Dwg 21D; App 2D Dwg 22D
CD-66921-01 2D 3.92 MB PBX Systems - No. 756A - Station Dial Transfer Trunk Circuit with Add-On Conference Iss 2D Dwg 9D; App 1B Dwg 10B; App 2D Dwg 11D; App 3D Dwg 12D
CD-67025-01 1 463.58 KB PBX Systems - Transmission Test Line - Termination Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2B Dwg 3B
CD-69000-01 26D 2.89 MB Station Systems - No. 100 Key Equipment - Multiple Line - Line and Auxiliary Signal Circuit for Use with Central Office or PBX with or without Arrangement to Retire Line Signal When Line is Released at Central Office or PBX Arranged for Intercommunicating Service Iss 26D Dwg 26D
CD-69001-01 15D 2.43 MB Station Systems - No. 100 Key Equipment - Multiple Line - Tie Line and Auxiliary Signal Circuit Iss 15D Dwg 15D; App 1D Dwg 16D
CD-69002-01 15D 1.80 MB Station Systems - No. 100 Key Equipment - Telephone, Dial, and Tripping Circuit Iss 15D Dwg 15D; App 1D Dwg 16D
CD-69021-01 1936-03-19 7D 153.10 KB Station Systems - No. 15A Key Equipment Arranged for Remote Switching Iss 7D Dwg 7D
CD-69037-01 1936-03-20 7D 174.37 KB Station Systems - No. 23A Key Equipment Arranged for Remote Switching Iss 7D Dwg 7D
CD-69091-01 16D 1.89 MB Station Systems - Key Telephone System No. 1A - Line and Signaling Circuit Iss 16D Dwg 16D
CD-69091-01 17D 6.33 MB Station Systems - Key Telephone System No. 1A - Line and Signaling Circuit Iss 17D Dwg 17D; App 2D Dwg 19D
CD-69096-01 7D 407.21 KB Station Systems - Key Telephone System No. 1A - Key and Telephone Circuit Arranged for Pickup and Holding on One Central Office or PBX Line and Pickup on 3 Private or Intercommunicating Lines with Common Signaling Key Iss 7D Dwg 7D
CD-69104-01 5D 321.26 KB Station Systems - Key Telephone System No. 1A - Key and Telephone Circuit for Combined Turn and Push Button Key Telephone Sets Iss 5D Dwg 5D
CD-69105-01 3A 3.68 MB Station Systems - Key Telephone System No. 1A - Private Line Circuit for an Off-Premise Extension Station Arranged to Provide for Central Office Service Iss 3A Dwg 6A; App D6A Dwg Hdbk; App 1D Dwg 7D
CD-69105-01 Hdbk 3A 686.34 KB Station Systems - Key Telephone System No. 1A - Private Line Circuit for an Off Premise Extension Station Arranged to Provide for Central Office Service
CD-69110-01 8D 2.50 MB Station Systems - Unattended Station Circuit for Transmitting External Audible Signals Back to a Calling Party Iss 8D Dwg 8D
CD-69128-01 6D 424.79 KB Station Systems - Key Telephone System No. 1A - Key and Telephone Circuit Arranged for Pick Up, Holding, Cut-Off and Signaling Iss 6D Dwg 6D
CD-69129-01 7D 385.83 KB Station Systems - Key Telephone System No. 1A - Key and Telephone Circuit Arranged for Pickup, Cut-Off, and Signaling Iss 7D Dwg 7D
CD-69131-01 3D 1.88 MB Station Systems - Key Equipment No. 103A Iss 3D Dwg 4D
CD-69132-01 4D 330.10 KB Station Systems - Key Telephone System No. 1A - Key and Telephone Circuit with Separately Mounted Keys Arranged for Pickup, Holding, Cut-Off and Signaling Iss 4D Dwg 4D
CD-69133-01 4D 234.50 KB Station Systems - Key Telephone System No. 1A - Key and Telephone Circuit with Separately-Mounted Keys Arranged for Pickup, Cutoff, and Signaling Iss 4D Dwg 4D
CD-69136-01 9B 664.68 KB Station Systems - Key Telephone System No. 1A - Line and Signaling Circuit with Strip Mounted Equipment Iss 9B Dwg 13B
CD-69140-01 3D 162.93 KB Station Systems - Key Telephone System No. 1A - Automatic Exclusion Circuit Iss 3D Dwg 3D
CD-69155-01 1 328.21 KB Station Systems - Key Telephone System No. 1A - Listening-In Circuits Iss 1 Dwg 1
CD-69160-01 18D 720.29 KB Station Systems - Equipment Units Iss 18D Dwg 18D; App 1D Dwg 19D; App 2D Dwg 20D
CD-69165-01 2D 248.08 KB Station Systems - Key Telephone System No. 1A - Station Circuits Using Wiring Plan Keys and Subscriber Sets Iss 2D Dwg 2D
CD-69186-01 1 472.43 KB Station Systems - Key Telephone System No. 1A - Lamp, Key and Telephone Circuit with Lamps in Telephone Set Arranged for Pickup and Holding on One Central Office or PBX Line and Pickup on 3 Private or Intercommunicating Links with Common Signaling Key Iss 1 Dwg 1
CD-69187-01 1 492.51 KB Station Systems - Key Telephone System No. 1A - Lamp, Key and Telephone Circuit with Lamps in Telephone Set Arranged for Pick Up, Holding, Cut-Off and Signaling Iss 1 Dwg 1
CD-69188-01 1 407.64 KB Station Systems - Key Telephone System No. 1A - Lamp, Key and Telephone Circuit with Lamps in Telephone Set Arranged for Pick Up, Cut-Off and Signaling Iss 1 Dwg 1
CD-69196-01 2D 384.93 KB Station Systems - Key Telephone System No. 1A - Attendant's Telephone and Key Circuit Using 101A Key Equipment Key Unit Iss 2D Dwg 2D
CD-69199-01 2D 827.36 KB [Station Systems - Intercommunicating Facilities to a Maximum of Nine Stations on a Single Subscriber's Premises Arranged so that Each Station on the Line Can Selectively Signal the Other Stations on the Line by One-Digit Dialing Codes] Iss 2D Dwg 2D
CD-69204-01 2D 3.58 MB Station Systems - Key Telephone System No. 2B for 2-Station Intercommunicating Service Arranged for a Loudspeaker and Distant Talking Transmitter at One Station Iss 2D Dwg 2D; App 1A Dwg 3A; App 2D Dwg 4D
CD-69206-01 1 510.08 KB Station Systems - Key Telephone Systems No. 1A or 1A1 - Key and Telephone Circuit Arranged for Pick-Up, Holding, Lamps, Exclusion, Cut-Off and Signaling Iss 1 Dwg 1
CD-69207-01 1 339.69 KB Station Systems - Key Telephone Systems No. 1A or 1A1 - Key and Telephone Circuit Arranged for Pickup, Holding, Cutoff and Signaling Iss 1 Dwg 1
CD-69211-01 4D 2.39 MB Station Systems - Civil Air Defense Warning Systems - Station Signal Indicator and Control Station Dial Circuit Iss 4D Dwg 4D; App 2D Dwg 6D
CD-69225-01 1 777.62 KB Station Systems - Station Circuits for Public Emergency Reporting Iss 1 Dwg 1; App 1D Dwg 2D
CD-69226-01 1 928.21 KB Station Systems - F-50682 Telephone Set - Private Line Station Circuit - 2-Wire or 4-Wire Arranged for Loop or Simplex Ringing Iss 1 Dwg 1; App 1D Dwg 2D
CD-69255-01 2D 5.67 MB Station Systems - Speakerphone System No. 1A - Telephone and Speakerphone Circuit Iss 2D Dwg 2D
CD-69286-01 6D 2.13 MB Station Systems - Key Telephone System No. 6A - Intercommunicating Line Circuit - Two-Wire Selective Signaling Iss 6D Dwg 6; App 1D Dwg 7D
CD-69360-01 2D 193.70 KB Station Systems - Order Turret No. 4 - Attendant Key and Telephone Circuit Iss 2D Dwg 2D
CD-69364-01 1 1.26 MB Station Systems - Control Station Circuit for Use with Central Office Group Alerting System Iss 1 Dwg 1; App 2A Dwg 3A
CD-69410-01 1 33.12 KB Station Systems - 4-Wire Private Line Circuit Arranged for SS1 or 600/1500-Cycle Selective Signaling, 20-Cycle Signaling, Voice or DC Outgoing Signaling, or Loudspeaker Incoming Signaling App 1D Dwg 2D
CD-69513-01 5B 104.04 KB Station Systems - Key Telephone System No. 1A2 - CO or PBX Line Circuit App 2B Dwg 11B; App 3B Dwg 12B; App 4B Dwg 13B
CD-69513-01 6B 1.04 MB Station Systems - Key Telephone System No. 1A2 - CO or PBX Line Circuit Iss 6B Dwg 15B
CD-69566-01 1 709.42 KB Station System - 4-Wire Private Line - Terminating and Station Circuit Iss 1 Dwg 1
CD-69604-01 1 152.82 KB Station Systems - Key Telephone System No. 1A2 - Off Premises Line Circuit Iss 1 Dwg 1
CD-69608-01 2A1C 118.77 KB Station Systems - Key Telephone System No. 1A2 - Dial Intercommunicating and Miscellaneous Panels Iss 2A1C Dwg 4A1C
CD-69611-01 2D 260.11 KB Station Systems - 516A Key Service Unit (433A KTU) Interconnecting Circuit and 105A Interconnecting Unit for Use Between Bell System CO and Customer-Provided Manual Switchboard or Automatic PBX Iss 2D Dwg 2D
CD-69617-01 1 345.16 KB Station Systems - Key Telephone System No. 1A2 - CO or PBX Line Circuit (Integrated Circuit Type) Iss 1 Dwg 1
CD-69624-01 2D 232.51 KB Station Systems - Key and Telephone Circuit for Rotary and "TOUCH-TONE" Dial 10-Button Telephone Sets - 830- and 2830-Type Telephone Sets Iss 2D Dwg 2D
CD-69625-01 1 223.22 KB Station Systems - Key and Telephone Circuit for Rotary and "TOUCH-TONE" Dial 20-Button Telephone Set - 831 A1M and 2831 A1M Telephone Sets Iss 1 Dwg 1
CD-69626-01 1 101.94 KB Station Systems - Interphone Radio Transfer Arrangement for Use with FAA Small Key Systems or 112 Key Equipment Iss 1 Dwg 1
CD-69635-01 1 98.56 KB Station Systems - Key Telephone System No. 1A2 - 584D Panel Connections Iss 1 Dwg 1
CD-69637-01 1 846.99 KB Station Systems - Key Telephone Systems No. 1A, 1A1, 1A2 and 6A - 630DA, 631DA, 2630DA, 2631DA Telephone Set Circuit - 18- and 30- Button Capacity for Use with 2-Wire Lines Arranged for Dial Pulse or "TOUCH-TONE" Calling and Handset or Speakerphone Operation Iss 1 Dwg 1
CD-69639-01 1 779.68 KB Station Systems - Key Telephone Systems No. 1A, 1A1, 1A2 and 6A - 636CA, 637DA, 2636CA, 2637DA Telephone Set Circuit - 18- and 30- Button Capacity for Use with 2-Wire Lines Arranged for Handset or Headset Operation and Dial Pulse or "TOUCH-TONE" Calling Iss 1 Dwg 1
CD-69641-01 1 803.65 KB Station Systems - Key Telephone System No. 1A2, 1A1, or 6A - 682AA, 2682AA, 683AA, and 2683AA Telephone Set Circuits - 18- and 30-Button Capacity Iss 1 Dwg 1
CD-69651-01 1 319.50 KB Station Systems - Key Telephone System No. 1A2 - CO or PBX Line Circuit - 400G KTU Iss 1 Dwg 1
CD-69900-01 1 469.94 KB Station Systems - 50A Conference Set (73A Control Unit) Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D
CD-69900-02 2A 520.85 KB Station Systems - 50A1 Conference Set (73B Control Unit) Circuit App 1D Dwg 3D
CD-69906-01 1 647.46 KB Station Systems - Key Telephone System No. 1A2 - "TOUCH-TONE" Adapter Circuit - Type D4 Iss 1 Dwg 1; App 1D Dwg 2D; App 2B Dwg 3B; App 3D Dwg 4D
CD-6C332-02 1 356.55 KB Common Systems - 3B Battery Charger Circuit Iss 1 Dwg 1; App 1A Dwg 2A
CD-70515-01 1 2.18 MB Telegraph Systems - Telegraph Test Board No. 9 - Telegraph Service Boards Nos. 2 and 9B - Toll Test Boards Nos. 5, 16 and 18B - Morse Board No. 4 - Interconnection Circuit for Carrier Telegraph Between VF Telegraph Line Bd. And Voice Frequency Facility Iss 1 Dwg 1; App 1AR Dwg 2AR; App 2AR Dwg 3AR; App 3AR Dwg 4AR; App 4D Dwg 5D
CD-73094-01 2D 2.31 MB Data Systems - Station - Data Test Set No. 911NA Iss 2D Dwg 2D; App 1A Dwg 3A; App 2B Dwg 4B
CD-73112-01 1 278.25 KB Data Systems - Station - EIA Test Adapter No. 911P for Use with RS-232A, B, or C Interface Connectors Iss 1 Dwg 1
CD-7C007-01 3B 970.57 KB Common Systems - Metallic Facility Terminal - Power Distribution Circuit for Use with Metallic Facility Terminal Bays Iss 3B Dwg 6B; App 1A Dwg 7A
CD-7C011-01 2A 1.48 MB Common Systems - Signaling - Tone Supply and Transfer - Fuse and Alarm - Power Converter - Carrier Group Alarm Circuit for Use with FU( ) & Auxiliary Signaling Units Iss 2A Dwg 4A
CD-7C012-01 2A 890.82 KB Common Systems - Signaling - FU( ) Plus Auxiliary Signaling Circuit for Use with Type F Signaling Iss 2A Dwg 4A; App 1B Dwg 5B
CD-7C018-01 4B 1.73 MB Common Systems - Metallic Facility Terminal - Bay Wiring Iss 4B Dwg 9B; App 1D Dwg 10D
CD-80223-01 1931-11-13 1 220.50 KB Power Systems - Charge and Discharge Circuit - 750-A P.B.X. Power Plants Arranged for Charging Over Cable Pairs or by Copper Oxide Rectifier Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D; App 4D Dwg 5D; App 5D Dwg 6D; App 6D Dwg 7D; App 7D Dwg 8D; App 8D Dwg 9D
CD-80477-01 1932-06-21 4D 467.24 KB Power Systems - 750-A PBX Power Plant - Charge and Discharge Circuit with Relay for Charge Control Iss 4D Dwg 4D
CD-80477-01 11D 113.84 KB Power Systems - 750A PBX Power Plant - Charge and Discharge Circuit with Relay for Charge Control Iss 11D Dwg 11D
CD-80588-01 10D 192.32 KB Power Systems - 755A P.B.X. Plant - Charge and Discharge Circuit with Relay for Charge Control Iss 10D Dwg 10D; App 1D Dwg 11D; App 2D Dwg 12AR
CD-80606-02 1 4.48 MB Power Systems - Regulated Tube Rectifier Ckt. - Magnitude Control - 115/230 Volts, 60 Cycles A-C - 50 Volts 8 Amps. Cont., 10 Amps. Intr. D-C - Panel Mounted - J86207J Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D; App 4B Dwg 5B; App 5D Dwg 6D; App 6D Dwg 7D; App 7D Dwg 8D; App 8D Dwg 9D; App 9D Dwg 10D
CD-80620-01 2AR 2.43 MB Power Systems - Rectifier Circuit - Regulated - Phase Shift Control - 190-250V, 50-60 Cycles AC - Electron Tube Type 132-152V, 8 Amp DC - Semiconductor Type 132-152V, 9 Amp DC - J86207C Iss 2AR Dwg 16AR; App 1B Dwg 17B
CD-80720-02 5D 2.00 MB Power Systems - 100 Type Plants - Discharge Circuit - 10-240 Ampere 44-50 Volt - 110A Plants Iss 5D Dwg 22D; App 1AR Dwg 23AR; App 2D Dwg 24D; App 3D Dwg 25D; App 4D Dwg 26D; App 5D Dwg 27D
CD-80722-02 4D 3.57 MB Power Systems - 100 & 700 Type Plants - Charge Circuit Using Regulated Rectifiers - 10-400 Ampere 44-50 Volt - 110A & 704C Plants Iss 4D Dwg 16D; App 1D Dwg 17D; App 2D Dwg 18D; App 3D Dwg 19D
CD-80728-01 1 2.22 MB Power Systems - 300 Type Plants - Battery Distributing Circuit - Grouping of Frames and Racks - Decentralized Power Filters - Step by Step System Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D; App 4D Dwg 5D; App 5D Dwg 6D; App 6D Dwg 7D; App 7D Dwg 8D; App 8D Dwg 9D; App 9D Dwg 10D
CD-80929-01 8B 1.11 MB Power Systems - 500 Type Plants - Power Supply Circuit - 50VA, 0.25, 0.5, 0.75, and 1.5 kVA - 20 or 22 Volt A-C Supply - 506A Plant Iss 8B Dwg 11B; App 1AC Dwg I12AC; App 2AC Dwg 13AC
CD-80942-01 3D 2.26 MB Power Systems - 400 Type Plants - Discharge Circuit - 1-25 Ampere Pos. and Neg. 130V. - Automatic Power Plant - 410A Plant Iss 3D Dwg 11D; App 1B Dwg 12B; App 2D Dwg 13D; App 3D Dwg 14D; App 4D Dwg 15D; App 5D Dwg 16D; App 6D Dwg 17D
CD-80943-01 3D 2.45 MB Power Systems - Charge Circuit - 130 Volts 1-25 Ampere - 410A Plants Iss 3D Dwg 13D; App 1D Dwg 14D; App 2B Dwg 15B; App 3B Dwg 16B; App 4 Dwg 17; App 5D Dwg 18D; App 6D Dwg 19D
CD-81126-01 2D 1.56 MB Power Systems - Control Circuit - Frame and Aisle Lighting - Incandescent Type and Appliance Outlets Iss 2D Dwg 2D; App 1D Dwg 3D; App 2D Dwg 4D; App 3D Dwg 5D; App 4B Dwg 6B
CD-81132-01 3D 566.83 KB Power Systems - 800 Type Plants - Ringing Circuit - Superimposing and Tripping Batteries - 806E & 806F Ringing Power Plants Iss 3D Dwg 4D
CD-81134-01 4B 2.23 MB Power Systems - 100 Type Plants - Charge and Discharge Circuit - 10, 20, & 30 Amperes - 48 Volts - 105D Plants Iss 4B Dwg 7B; App 1D Dwg 8D; App 2D Dwg 9D; App 3D Dwg 10D
CD-81138-01 2A 1.69 MB Power Systems - Rectifier Circuit - Electron Tube Type - Automatic Regulation - 48 Volts, 8 Amperes DC - J86251A Iss 2A Dwg 3A; App 1A Dwg 4A; App 2B Dwg 5B; App 3B Dwg 6B; App 4D Dwg 7D
CD-81171-01 1 124.41 KB Power Systems - 800 Type Plants - Signaling Circuit - Howler Interrupter - KS-15547 Machine - J86726E Iss 1 Dwg 1; App 1D Dwg 2D; App 2B Dwg 3B
CD-81180-01 2A 2.75 MB Power Systems - Rectifier Circuit - Metallic Type - Automatic Regulation - 48 Volts - 30 Amperes - J86263A Iss 2A Dwg 2A; App 10A Dwg 12A; App 11D Dwg 13D; App 1B Dwg 3B; App 2B Dwg 4B; App 3B Dwg 5B; App 4D Dwg 6D; App 5D Dwg 7D; App 6B Dwg 8B; App 7B Dwg 9B; App 8D Dwg 10D; App 9B Dwg 11B
CD-81225-01 2B 4.57 MB Power Systems - 800 Type Plants - Ringing Circuit - AC-DC or Superimposed Ringings - SXS System No. 355A - 806F Ringing Power Plant Iss 2B Dwg 9B; App 1D Dwg 10D
CD-81288-01 1 68.83 KB Power Systems - Ringing Circuit - Interrupter Equipment - 756A PBX - J86464C Iss 1 Dwg 1; App 1D Dwg 2D
CD-81318-01 7D 116.95 KB Power Systems - Rectifier Circuit - Semiconductor Type - Automatic Regulation - 48 Volts 7.5 Amperes - J86281A Iss 7D Dwg 13D
CD-81325-01 2B 120.30 KB Power Systems - Ringing Circuit - Ringing & Tone Supply - 756A PBX - J86464D Iss 2B Dwg 3B; App 1D Dwg 4D; App 2D Dwg 5D
CD-81326-01 6D 79.60 KB Power Systems - Power Supply Circuit for 756A PBX - J86464 Iss 6D Dwg 11D
CD-81326-02 2D 885.34 KB Power Systems - Power Supply Circuit for 756A PBX with Battery Reserve - J86464 Iss 2D Dwg 5D; App 1B Dwg 6B; App 2D Dwg 7D; App 3D Dwg 8D
CD-81328-01 5D 436.59 KB Power Systems - Signaling Circuit - Transistor Low Tone Supply - 756A PBX - J86464G Iss 5D Dwg 5D; App 1D Dwg 6D
CD-81329-01 6B 225.28 KB Power Systems - Ringing Circuit - Transistor 20∼ Supply - 756A PBX - J86464H Iss 6B Dwg 6B
CD-81329-01 7D 590.89 KB Power Systems - Ringing Circuit - Transistor 20∼ Supply - 756A PBX & 800A PBX - J86464H Iss 7D Dwg 7D; App 1D Dwg 8D
CD-81330-01 3D 154.75 KB Power Systems - Supply Circuit - Transistor 60∼ Supply - 756A PBX - J86464J Iss 3D Dwg 3D
CD-81331-01 5B 289.65 KB Power Systems - Ringing Circuit - Transistor Transfer and Alarm for 20 and 60 Cycle Supplies - 756A PBX - J86464F Iss 5B Dwg 5B
CD-81337-01 2D 1.24 MB Power Systems - Ringing Circuit - AC-DC Ringing - 701B, 711B & 740E PBX - 806G Ringing Power Plant - J86472 Iss 2D Dwg 8D; App 1D Dwg 9D; App 2D Dwg 10D
CD-81396-01 3A 1.07 MB Power Systems - Rectifier Circuit - Semi Conductor Type - Automatic Regulation - 48 & 24 Volt, 30 Amperes - J86231A Iss 3A Dwg 4A; App 1B Dwg 5B; App 2B Dwg 6B
CD-81504-01 4B 899.10 KB Power Systems - Power Supply Circuit - DC to DC Transistor Converter - ±120 Volt or ±130 Volt Output - -48 Volt Input - 610B Plant Iss 4B Dwg 15B; App 1B Dwg 16B; App 2B Dwg 17B; App 3AC Dwg 18AC
CD-81540-01 6B 1.18 MB Power Systems - Regulated Rectifier - Semiconductor Type - 48 Volts 11 Amperes DC - 115/230 Volts 60 Cycles AC - J87211A Iss 6B Dwg 13B; App 1AR Dwg 14AR; App 2AC Dwg 15AC; App 3D Dwg 16D; App 4D Dwg 17D; App 5B Dwg 18B
CD-81541-01 3AC 976.00 KB Power Systems - Regulator Control Circuit - Semiconductor Type - J87214A Iss 3AC Dwg 5AC; App 1D Dwg 6D; App 2B Dwg 7B
CD-81577-01 3D 141.68 KB Power Systems - Power Supply Circuit - AC, DC & Ringing Supply for Switching System 400 - J86812A & B Iss 3D Dwg 3D; App 1D Dwg 4D; App 2B Dwg 5B
CD-81577-01 5B 1.07 MB Power Systems - Power Supply Circuit - AC, DC & Ringing Supply - J86812A & B Iss 5B Dwg 7B; App 1D Dwg 8D; App 2B Dwg 9B; App 3D Dwg 10D; App 4D Dwg 11D; App 5D Dwg 12D; App 6D Dwg 13D
CD-81581-01 3D 417.08 KB Power Systems - Slide No. 1 Power Supply for 757A PBX - J86808B Iss 3D Dwg 9D; App 1B Dwg 10B
CD-81581-01 5B 1.37 MB Power Systems - Slide No. 1 Power Supply for 757A PBX - J86808B Iss 5B Dwg 17B; App 1D Dwg 18D; App 2D Dwg 19D; App 3B Dwg 20B; App 4D Dwg 21D; App 5D Dwg 22D
CD-81591-01 3AR 1.61 MB Power Systems - 100 Type Plants - Charge and Discharge Circuit - Positive or Negative 48 Volts, 30 Ampere - 105E Power Plant Iss 3AR Dwg 8AR; App 1AR Dwg 9AR; App 2B Dwg 10B
CD-81600-01 4D 77.95 KB Power Systems - Power Supply Circuit - AC, DC & Ringing Supply for 756A Batteryless PBX - J86464L Iss 4D Dwg 5D
CD-81600-01 5B 608.87 KB Power Systems - Power Supply Circuit - AC, DC & Ringing Supply for 756A Batteryless PBX - J86464L Iss 5B Dwg 6B; App 1B Dwg 7B; App 2D Dwg 8D; App 3D Dwg 9D
CD-81719-01 2AR 683.93 KB Power Systems - Signaling Circuit - Dial Tone Generator for PBX - "TOUCH-TONE" Calling Iss 2AR Dwg 3AR
CD-81719-01 4A 717.95 KB Power Systems - Signaling Circuit - 404 (A, B, C, & D) & 405 (A, B, C & D) Dial Tone Generators for PBX - "TOUCH-TONE" Calling Iss 4A Dwg 7A; App 1B Dwg 8B; App 2D Dwg 9D; App 3D Dwg 10D; App 4D Dwg 11D
CD-81837-01 3D 1.91 MB Power Systems - Remote Test Voltage Supply Circuit - J87300 Iss 3D Dwg 6D; App 1B Dwg 7B; App 2D Dwg 8D; App 3D Dwg 9D; App 4B Dwg 10B
CD-81920-01 1 535.55 KB Power Systems - Power Supply Circuit - -96 Volt DC Applique for 756A PBX - J86464P Iss 1 Dwg 1; App 1B Dwg 2B; App 2D Dwg 3D
CD-82447-01 1 170.42 KB Power Systems - Charge and Discharge Circuit - 48 Volts, 600 Amps - 100 Type Plants - 151C Power Plant Iss 1 Dwg 1; App 1B Dwg 2B
CD-82588-01 1 508.60 KB Power Systems - "LINEAGE" 2000 Controller for 24 Volt or 48 Volt Power Plant - J85501A Iss 1 Dwg 1; App 2A Dwg 3A; App 3AC Dwg 4AC; App 4A Dwg 5A; App 5B Dwg 6B; App 6M Dwg 7M; App 7B Dwg 8B; App 8M Dwg 9M; App 9A Dwg 10A
CD-82588-02 1 25.01 KB Power Systems - "LINEAGE" 2000 MCS/CCS Controller for 24 Volt or 48 Volt Power Plant - J85501A-2 / J85501A-3 App 1B Dwg 2B
CD-82603-01 2B 535.23 KB Power Systems - "LINEAGE" 2000 Charge and Discharge Circuit - 24 or 48 Volts 6400 Amperes Maximum - J85500 Iss 2B Dwg 4B; App 1A Dwg 5A; App 2B Dwg 6B; App 3M Dwg 7M
CD-82604-01 1 660.20 KB Power Systems - "LINEAGE" 2000 Rectifier Circuit - Input: 208 or 240 Volts 60 Hz - Output: 24 Volts or 48 Volts 25 or 50 Amperes - J85502A&B Iss 1 Dwg 1; App 1B Dwg 2B; App 2A Dwg 3A; App 3M Dwg 4M; App 4M Dwg 5M; App 6M Dwg 7M; App 7M Dwg 8M
CD-82605-01 1 797.59 KB Power Systems - "LINEAGE" 2000 Rectifier Circuit - 208/240/480 Volt, 60 Hz, 3 Phase Input - 24 or 48 Volt, 100 or 200 Ampere Output - J85503A&B Iss 1 Dwg 1; App 1A Dwg 2A; App 2B Dwg 3B; App 3A Dwg 4A; App 4M Dwg 5M; App 5M Dwg 6M; App 6M Dwg 7M; App 7A Dwg 8A
CD-82619-01 2B 440.67 KB Power Systems - DC Power - Distributing Frame - J86334D Iss 2B Dwg 2B
CD-82646-01 1 280.17 KB "LINEAGE" XCS Controller - J85501B Iss 1 Dwg 1; App 1B Dwg 2B
CD-82649-01 1 311.38 KB Power Systems - "LINEAGE" 2000 Charge and Discharge Ckt - 24 or 48 Volts 600 Amperes Maximum - J85500C Iss 1 Dwg 1; App 1B Dwg 2B; App 2B Dwg 3B; App 3B Dwg 4B
CD-82659-01 2A 375.15 KB Power Systems - "LINEAGE" 2000 Rectifier Circuit - Input: 208 or 240 Volts, 60 Hz - Output: 24 Volts or 48 Volts 125 Amperes - J85502C Iss 2A Dwg 2A
CD-83102-01 2AC 598.09 KB Power Systems - Rectifier Circuit - 208/240 or 480 Volt, 60 Hz Input - 48 Volt, 400 Ampere Output - J85503C Iss 2AC Dwg 2AC; App 1B Dwg 3B; App 2A Dwg 4A; App 3B Dwg 5B; App 4M Dwg 6M; App 5A Dwg 7A
CD-83104-01 1 556.00 KB Power Systems - "LINEAGE" 2000 Charge and Discharge Circuit - 24 or 48 Volts, 400 Amperes Maximum Iss 1 Dwg 1; App 1B Dwg 2B; App 2B Dwg 3B; App 3A Dwg 4A; App 4B Dwg 5B; App 5B Dwg 6B
CD-8G000-01 1 27.86 KB 5ESS Switching Equipment - Access Interface Unit (AIU) Iss 1 Dwg 1
CD-90122-01 8D 1.21 MB Common Systems - Test Terminal Circuit for Battery and Ground for Toll, Manual, Panel, Step-by-Step, Crossbar or Telegraph Systems Iss 8D Dwg 9D; App 1D Dwg 10D; App 2D Dwg 11D; App 3D Dwg 12D; App 4D Dwg 13D; App 5D Dwg 14D; App 6D Dwg 15D
CD-90469-02 13D 12.64 MB Common Systems - Trunk Test Set Circuit for Use in Step-by-Step Offices in Testing Subscriber Recording Completing Trunks, Outgoing Trunks from Selector Equipment, Coin Trunk Circuits, Line and Trunk Finders, Selectors, Connectors, and Outgoing Repeaters and Rotary Out Trunk Switches and in Toll Offices for Testing 3-Wire Subscriber Recording Completing Trunks from Step-by-Step Offices Iss 13D Dwg 15D; App 1D Dwg 16D; App 2D Dwg 17D; App 3D Dwg 18D; App 4B Dwg 19B; App 5D Dwg 20D
CD-90515-01 1 2.41 MB Common Systems - Telephone Repeater Application Schematic - 22 Type Telephone Repeater for Use in P.B.X. or Long Subscriber Lines or Trunk Circuits Iss 1 Dwg 1; App 1D Dwg 2D; App 2AR Dwg 3AR; App 3D Dwg 4D; App 4D Dwg 5D; App 5D Dwg 6D; App 6D Dwg 7D
CD-90517-01 4D 968.38 KB Common Systems - Line and Balancing - Compromise and Balancing Networks for Use with Exchange Area Circuits or Attendants Telephone Sets Iss 4D Dwg 15D; App 1D Dwg 16D
CD-95000-01 6D 1.86 MB Common Systems - Transmission Measuring - Milliwatt Distributing Ckt with 2A Sending Panel Iss 6D Dwg 22D; App 1D Dwg 23D; App 2D Dwg 24D; App 3B Dwg 25B; App 4D Dwg 26D
CD-95000-02 1 1.26 MB Common Systems - Transmission Measuring - Milliwatt Distributing Ckt Using 2A Sending Panel Iss 1 Dwg 1; App 1D Dwg 2D
CD-95015-01 3D 1.15 MB Common Systems - Line and Balancing - Repeating Coil and Compromise Network Ckt. For Use with Trunk and Long Line Circuits Iss 3D Dwg 8D; App 1D Dwg 9D; App 2D Dwg 10D
CD-95032-01 6D 1.23 MB Common Systems - Composite Signaling Circuit Type B with Type D CX Set and Reating Coils Arranged for Phantom Group or Single Physical 2 Way Signaling 2 Way Dialing Over Short Haul Cable and Open Wire Non-Repeatered Circuits Iss 6D Dwg 13D
CD-95072-01 14D 2.57 MB Common Systems - Distribution Fuse, Common Aisle and Miscellaneous Individual Alarm Circuit with 24V Battery Supply Iss 14D Dwg 20D
CD-95102-02 2B 1007.67 KB Common Systems - Transmission Measuring - 1W Noise Amplifier Rectifier Ckt. For Measuring Noise on Transmission Circuits on a Message Weighting Basis Iss 2B Dwg 5B; App 1B Dwg 6B; App 2B Dwg 7B; App 3B Dwg 8B; App 4B Dwg 9B; App 5B Dwg 10B
CD-95113-01 3B 1.54 MB Common Systems - "V3" Telephone Repeater - Battery Supply and Connecting Ckts for One or More VF Amplifiers Iss 3B Dwg 8B
CD-95118-01 15B 5.24 MB Common Systems - "N", "O" & "ON" Carrier Telephone - N1, O1, ON1 & ON2 Channel Ckt Iss 15B Dwg 27B; App 1B Dwg 28B; App 2B Dwg 29B
CD-95121-01 8D 3.62 MB Common Systems - "N1" Carrier Telephone - Application Schematic for Terminal Iss 8D Dwg 19D; App 1B Dwg 20B; App 2B Dwg 21B; App 3B Dwg 22B; App 4B Dwg 23B
CD-95124-01 8B 445.41 KB Common Systems - "N1" & "ON" Carrier Telephone - Application Schematic for "N1", "ON1" & "ON2" Repeater Iss 8B Dwg 23B; App 1B Dwg 24B
CD-95129-01 4D 2.54 MB Common Systems - "N1" Carrier Telephone - Low Group Transmitting Ckt. Iss 4D Dwg 7D; App 1B Dwg 8B; App 2D Dwg 9D; App 3B Dwg 10B
CD-95130-01 1 2.44 MB Common Systems - "N1" Carrier Telephone - High Group Receiving Ckt. Iss 1 Dwg 1; App 1A Dwg 2A; App 2A Dwg 3A; App 3A Dwg 4A; App 4B Dwg 5B; App 5AR Dwg 6AR; App 6D Dwg 7D; App 7D Dwg 8D
CD-95142-01 8D 1.68 MB Common Systems - Type N Carrier Telephone - Signaling - Order Wire and Alarms - Line Bridging, Cutoff Relay and Power Supply Arrangements Iss 8D Dwg 19D
CD-95143-01 5D 2.56 MB Common Systems - Type N Carrier Telephone - VF Alarm and Order Wire Signaling Ckt Iss 5D Dwg 9D; App 1D Dwg 10D; App 2D Dwg 11D; App 3D Dwg 12D
CD-95144-01 3B 4.27 MB Common Systems - "V3" Telephone Repeater - Line and Balancing - Application Schematic for Use with Voice Frequency and Carrier Ckts. Iss 3B Dwg 8B
CD-95150-01 12D 3.21 MB Common Systems - "O" & "ON" Carrier Telephone - Application Schematic - "O1", "ON1" & "ON2" Carrier Terminal - Also for Use with ON/K Carrier Terminal Iss 12D Dwg 19D; App 1D Dwg 20D; App 2D Dwg 21D
CD-95151-01 10B 513.05 KB Common Systems - "O" & "ON" Carrier Telephone - O1, ON1, and ON2 Twin-Channel Carrier Ckt. Iss 10B Dwg 16B
CD-95152-01 9B 3.12 MB Common Systems - "O" & "ON" Carrier Telephone - OB1, OC1, OD1, Group Receiving or Repeater Amplifier Ckt. And ON1 & ON2 Group Receiving Ckt. Iss 9B Dwg 12B
CD-95153-01 9D 1.99 MB Common Systems - "O" & "ON" Carrier Telephone - OB1, OC1, OD1, ON1 & ON2 Group Transmitting Ckt. Iss 9D Dwg 10D; App 1D Dwg 11D; App 2B Dwg 12B
CD-95154-01 8A 1.38 MB Common Systems - "O" and "ON" Carrier Telephone - "O1" Terminal Group Oscillator & "ON1" and "ON2" Group Oscillator Ckts Iss 8A Dwg 13A; App 1D Dwg 14D
CD-95158-01 7A 1.01 MB Common Systems - "O" and "ON" Carrier Telephone - O1 Repeater Oscillator & Misc. Oscillator & ON1 Misc. Oscillator Ckts. Iss 7A Dwg 11A; App 1D Dwg 12D
CD-95163-01 3A 856.57 KB Common Systems - "N1" & "O1" Carrier Telephone - Channel Test Stand Ckt. And Connecting Cord - Testing and Maintenance Iss 3A Dwg 3A; App 1B Dwg 4B
CD-95178-01 2D 3.76 MB Common Systems - "N1" Carrier Telephone - High-Low Repeater Ckt. Iss 2D Dwg 2D; App 1D Dwg 3D; App 2B Dwg 4B
CD-95178-01 3B 3.67 MB Common Systems - "N1" Carrier Telephone - High-Low Repeater Ckt Iss 3B Dwg 5B
CD-95179-01 2D 3.66 MB Common Systems - "N1" Carrier Telephone - Low-High Repeater Ckt. Iss 2D Dwg 2D
CD-95198-01 4B 571.47 KB Common Systems - "ON" Carrier Telephone - ON1 or ON2 Combining Network & Oscillator Ckt Iss 4B Dwg 4B
CD-95224-01 3B 1.11 MB Common Systems - ON1, ON2 & ON/K Carrier Telephone - Slope Network, Span Pads and Artificial Line Ckts. Iss 3B Dwg 3B
CD-95259-01 1 195.61 KB Common Systems - KS-16617 Amplifier Circuit - Special Purpose Amplifier for Use in MDF Loudspeaker Telephone System Iss 1 Dwg 1; App 1D Dwg 2D
CD-95277-01 6B 1.86 MB Common Systems - Transmission Measuring - Milliwatt Distributing Circuit Using 71 Type Milliwatt Reference Generator Iss 6B Dwg 11B; App 1B Dwg 12B; App 2B Dwg 13B
CD-95277-02 3B 2.02 MB Common Systems - Transmission Measuring - Milliwatt Distributing Circuit Using 71F Milliwatt Reference Generator Iss 3B Dwg 6B
CD-95281-01 1 1.55 MB Common Systems - KS-16754 Amplifier Circuit Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D; App 4B Dwg 5B; App 5B Dwg 6B; App 6D Dwg 7D
CD-95294-01 2A 5.79 MB Common Systems - "N2" Carrier Telephone Compandor Ckt Iss 2A Dwg 2A; App 10B Dwg 12B; App 11AR Dwg 13AR; App 12D Dwg 14D; App 13D Dwg 15D; App 14B Dwg 16B; App 15B Dwg 17B; App 1A Dwg 3A; App 2B Dwg 4B; App 3AC Dwg 5AC; App 4B Dwg 6B; App 5B Dwg 7B; App 6B Dwg 8B; App 7AR Dwg 9AR; App 8B Dwg 10B; App 9B Dwg 11B
CD-95460-01 1 261.32 KB Common Systems - Repeater Circuit Arranged for Operating on 48 Volt Filament Supply for Use at Terminating Office with Announcement Desk No. 1 or 1B Iss 1 Dwg 1; App 1D Dwg 2D; App 2D Dwg 3D; App 3D Dwg 4D; App 4D Dwg 5D; App 5D Dwg 6D
CD-95703-01 2D 255.67 KB Common Systems - MF Keyset Circuit - Local Test Cabinet No. 3 Iss 2D Dwg 3D; App 1D Dwg 4D; App 2B Dwg 5B; App 3D Dwg 6D; App 4D Dwg 7D
CD-95739-01 10D 1.74 MB Common Systems - Line Concentrator Identifier Circuit Applied to Telephone Secretarial Service Originating End Iss 10D Dwg 20D
CD-95748-01 9D 1.13 MB Common Systems - Line Concentrator-Identifier Circuit Applied to Telephone Secretarial Service Terminating End Iss 9D Dwg 17D; App 1B Dwg 18B
CD-95867-01 4D 2.17 MB Common Systems - Multifrequency Signal Generator Circuit Iss 4D Dwg 5D; App 1D Dwg 6D; App 2AR Dwg 7AR
CD-95867-01 5D 272.18 KB Common Systems - Multifrequency Signal Generator Circuit Iss 5D Dwg 11D; App 1D Dwg 12D; App 2B Dwg 13B
CD-95890-01 4D 953.72 KB Common Systems - Outpulser Connector Circuit - Automatic Number Identification Type B and Type C - Crossbar No. 1, Panel or Step-by-Step No. 1, 350A, 355A or 35E97 Office Iss 4D Dwg 9D; App 1D Dwg 10D; App 2B Dwg 11B; App 3D Dwg 12D; App 4B Dwg 13B
CD-95956-01 2B 191.93 KB Common Systems - Dual Channel Recevier Circuit - 700 and 1100 Cycles per Second Iss 2B Dwg 5B; App 1D Dwg 6D; App 2D Dwg 7D; App 3D Dwg 8D
CD-95973-01 2D 165.51 KB Common Systems - Subscriber Loop - Bridge Lifting Circuit Iss 2D Dwg 2D
CD-96002-01 2D 844.30 KB Common Systems - Local Test Cabinet No. 2 - Test Set Circuit - Test Battery Supply Jack Circuit for Testing Subscriber Lines and Trunks Iss 2D Dwg 2D
CD-96147-01 2D 313.39 KB Common Systems - Transmission Measuring - Sending Pad Circuit for VF Channel Tests at "N" or "O" Carrier Telephone Terminal Iss 2D Dwg 2D
CD-96181-01 10D 1.50 MB Common Systems - Local Test Cabinet No. 3 - Telephone and Test Circuit for Testing Subscriber Lines Iss 10D Dwg 24D; App 1AC Dwg 25AC; App 2B Dwg 26B; App 3B Dwg 27B; App 4D Dwg 28D
CD-96190-01 2D 486.91 KB Common Systems - "N1" Carrier Telephone - "E" Lead Grounding Ckt. For Providing "E" Lead Ground During Carrier Failure Iss 2D Dwg 2D; App 1AR Dwg 3AR
CD-96221-01 8D 380.71 KB Common Systems - Two-Way Trunk Circuit to Subscriber Line Circuit - Incoming Ringdown Outgoing Automatic or 2-Way Ringdown to Other Desks - Local Test Cabinet No. 3 - Key Cabinet No. 20 or 21 - Local Test Desk No. 14 or Local Test Desk No. 16 or Line Status Verifier CTG Test Board - Master Test Frame - ACD Test Frame - Chief Switchman's Desk - Sender Make Busy Frame - Test Supervisor's Private Desk - Repair Service Desk No. 2 - Cable Test Desk No. 3 - ESS No. 1 Master Control Center - Local Test Desk No. 15B Iss 8D Dwg 22D
CD-96403-01 11A 3.03 MB Traffic Management Systems - Dial Tone Speed Register Circuit for Use in Dial Offices Iss 11A Dwg 30A
CD-96474-01 6AC 815.76 KB Common Systems - Test Trunk Ringing Circuit Iss 6AC Dwg 18AC; App 1B Dwg 19B; App 2B Dwg 20B
CD-96555-01 4D 535.43 KB Common Systems - Dial Long Line Circuit - 10 or 20 PPS Repeating for Subscriber Lines, PBX Station Lines or PBX Manual Selected Trunks - Dial Central Office or PBX Iss 4D Dwg 13D; App 1D Dwg 14D; App 2A Dwg 15A; App 3D Dwg 16D; App 4D Dwg 17D
CD-97047-01 6D 1.43 MB Common Systems - V4 Telephone Repeater - Battery Supply and Connecting Circuits for Two or More VF Amplifiers Iss 6D Dwg 17D
CD-97102-01 3D 185.81 KB Common Systems - 15 Amp Decentralized Filter Circuit for Talking or Filament Battery Supply Arranged for Mounting from the Superstructure Iss 3D Dwg 14D; App 1D Dwg 15D; App 2D Dwg 16D
CD-97753-01 4D 1.64 MB Common Systems - 13A Announcement System Circuit for Recording and Reproducing Dial Facilities Management Announcements Iss 4D Dwg 8D
CD-97798-01 3B 787.38 KB Common Systems - 14A Announcement System Circuit Iss 3B Dwg 8B
CD-98100-01 7B 3.71 MB Common Systems - Transmission Test Line or Test Trunk Circuit - Crossbar, Manual, Panel, Step-by-Step, PBX, or Toll Offices Iss 7B Dwg 19B; App 1A Dwg 20A; App 2D Dwg 21D; App 3A Dwg 22A
CD-98148-01 4B 593.97 KB Common Systems - "TOUCH-TONE" Calling Receiving Circuit Type A3 Iss 4B Dwg 15B; App 1D Dwg 16D; App 2B Dwg 17B; App 3D Dwg 18D
CD-99303-01 5A 711.39 KB Common Systems - 400A Tone Generator Circuit Iss 5A Dwg 12A; App 1B Dwg 13B; App 2A Dwg 14A; App 3B Dwg 15B; App 4D Dwg 16D; App 5D Dwg 17D; App 6D Dwg 18D; App 7D Dwg 19D
CD-99328-01 4D 308.99 KB Common Systems - Signal Generator for Supplying Frequencies to Keysets Arranged to Pulse 2/6 and 4x4 Frequencies Iss 4D Dwg 8D; App 1D Dwg 9D
CD-99331-01 1 1.30 MB Common Systems - 60A Control Unit Circuit Iss 1 Dwg 1; App 1A Dwg 2A; App 2B Dwg 3B; App 3D Dwg 4D; App 4D Dwg 5D; App 5D Dwg 6D; App 6AC Dwg 7AC; App 7D Dwg 8D; App 8D Dwg 9D
CD-99331-01 4B 409.43 KB Common Systems - J99329A Control Unit (60A) Circuit Iss 4B Dwg 16B
BT-207017 1925-08-04 1 588.89 KB Panel Machine Switching System - Coin Circuit for Incoming Trunks - To be Used in Offices Where Multiple Banks Require Break Down Protection Iss 1 Dwg 18
BT-207197 1942-04-30 2 838.26 KB Panel System - Starting Circuit for Use with Panel Line Finder - Battery Grounded at End Iss 2 Dwg 26
CD-207389 31D 1.29 MB Panel Systems - Final Circuit with Marginal Relay Test Circuit Iss 31D Dwg 31D
CD-207550 1937-10-08 13D 1.83 MB Panel System - Incoming From Manual Key Indicator System With 4 Party Semi-Selective Ringing Iss 13D Dwg 13D; App 14D Dwg 14D; App 15AR Dwg 15AR
BT-207867 1930-04-02 3 432.68 KB Miscellaneous Tone and Interrupter Circuits - Panel System Iss 3 Dwg 23
BT-207959 1939-05-01 1 1.20 MB Panel System - Final Circuit with Marginal Relay Test Circuit - Arranged for Routine Testing of Subscriber Lines Iss 1 Dwg 14; App 1 Dwg 15
BT-226253 1938-01-11 2 109.73 KB Panel System - Emergency Alarm Circuit - Trouble Desk - Main Alarm Board or Floor Alarm Board Iss 2 Dwg 13
BT-226309 1938-04-15 1 419.65 KB Panel System - Selector Time Alarm Iss 1 Dwg 17
BT-226349 1938-03-11 3 481.12 KB Panel System - Motor Stop and Frame Busy Circuits - For Use with Main and Floor Alarm Boards Iss 3 Dwg 21D; App 1 Dwg 22
BT-226378 1937-11-19 1 21.02 MB Panel System - District Selector - For Coin Lines, with Message Register - If Specified, Battery Ground at End - For Panel Linefinder Iss 1 Dwg 25; App 1 Dwg 31
BT-226379 1938-01-11 1 4.29 MB Panel System - Line Finder Time Alarm Circuit - Panel Line Finder - Battery Grounded at One End Iss 1 Dwg 17; App 1 Dwg 18
CD-226467 36AC 1.57 MB Panel Systems - Trunk Test Cord - Trouble Desk Iss 36AC Dwg 36AC
BT-226617 1941-10-07 2 876.15 KB Panel Systems - 2-Party Message Line and Trip Circuit - Panel Line Finder - Battery Grounded at End Iss 2 Dwg 19
BT-226886 1938-01-11 2 2.39 MB Panel System - Inter-Office Incoming - From Key Indicator System - From Mechanical with 900 Ohm - 1300 Ohm Fundaments or Full Mechanical Tandem Iss 2 Dwg 23; App 1 Dwg 24
BT-226909 1938-04-07 1 637.62 KB Panel System - Line and Trip Circuit, Panel Line Finder - Ind. Message, Coin, and Flat Rate Lines Iss 1 Dwg 18
BT-239375 1925-06-23 1 395.99 KB Panel Machine Switching System - Permanent Signal Trunk Group - Overflow Meter Circuit Iss 1 Dwg 4
CD-239382 35D 25.66 MB Panel System - Automatic Test of Final Selectors Iss 35D Dwg 35D
BT-239413 1937-12-31 2 520.23 KB Panel Machine Switching System - Dialing Set for Subscribers District Selectors Iss 2 Dwg 13
BT-239444 1931-08-24 2 2.74 MB Panel System - Trunk Line - Two-Way to Final Multiple, Line Switch - Line Finder or Manual Switchboard - To Desks Iss 2 Dwg 12
CD-239444 14D 525.79 KB Panel Systems - Trunk Line - 2-Way to Final Multiple, Line Switch - Line Finder or Manual Switchboard to Desks Iss 14D Dwg 14D
BT-239515 1929-03-21 3 1.95 MB Subscribers' District Selectors - Line Finder Type - Panel System Iss 3 Dwg 19
BT-239515 1942-09-02 5 77.57 MB Panel System - Automatic Test of Subscribers District Selector - Line Finder Type Iss 5 Dwg 35; App 1 Dwg 37; App 2 Dwg 39; App 3 Dwg 40; App 4 Dwg 41; App 5 Dwg 46
CD-239515 55D 7.48 MB Panel System - Automatic Test of Subscribers District Selector - Line Finder Type Iss 55D Dwg 55D; App 1AR Dwg 56AR; App 2AC Dwg 57AC
BT-239589 1925-01-31 1 1.24 MB Three Wire Dialing Incoming Selector Circuit - Incoming from "A" Swbd. Iss 1 Dwg 12
CD-239655 1937-10-08 12D 1.99 MB Panel System - Two-Wire Incoming Selector from Toll Key Indicator System - Direct, Two and Four Party Semi-Selective Iss 12D Dwg 12D; App 13D Dwg 13D; App 14D Dwg 14D; App 15AR Dwg 15AR
CD-239664 43D 1.21 MB Panel System - Final Circuit With Time Measure Release on Permanent Signals Iss 43D Dwg 43D
BT-239665 1946-09-24 4 1.74 MB Panel System - Final Circuit - With Time Measure Release On Permanent Signal and for Routine Testing of Subscriber's Lines Iss 4 Dwg 31
CD-239665 38D 1.50 MB Panel Systems - Final Circuit With Time Measure Release On Permanent Signal and for Routine Testing of Subscriber's Lines Iss 38D Dwg 38D
CD-239810 33D 5.13 MB Panel Systems - Automatic Test of Incoming Selectors Iss 33D Dwg 33D
CD-239844 1937-03-31 23D 6.46 MB Panel System - Selector Test Circuit for Testing Office Incoming and Final Selectors Iss 23D Dwg 23D; App 24D Dwg 24D
BT-240071 1941-06-06 3 26.67 MB Panel System - Selector Circuit - District and Panel Line Finder for Non-Coin Lines Iss 3 Dwg 38; App 1 Dwg 39
BT-240075 1942-04-13 1 26.43 MB Panel System - Selector Circuit District for Coin Lines with Message Register if Specified for Panel Line Finder Iss 1 Dwg 27; App 1 Dwg 29; App 2 Dwg 30
BT-240206 1938-03-29 3 407.81 KB Panel System - Link and Selector Time Alarm Circuit - Using Interrupter and Relays Iss 3 Dwg 10
BT-240293 1932-06-15 1 969.31 KB Panel System - Starting Circuit - For Use with Panel Line Finder - With Trip Circuit Lockout Feature Iss 1 Dwg 12
CD-357170 9D 457.17 KB Toll Systems - Toll Test Board No. 5 - Two-Way Ringdown Trunk or Dial Trunk Circuit to Offices for Use Where Trunks are Multipled Iss 9D Dwg 9D
BT-358038 1940-06-26 2 1.05 MB Panel System - Local Test Desk No. 12-B - Telephone Circuit Arranged for Loud Speaker Trunk Circuit Iss 2 Dwg 10
BT-359373 1938-04-20 3 776.14 KB Panel System - Local Test Desk No. 12-B - Test Circuit - Supplementary Test Features Iss 3 Dwg 7; App 1 Dwg 10; App 2 Dwg 11
BT-431140 1921-03-03 4 736.65 KB Individual Line Circuit - Schematic for Full Mechanical Switching System Iss 4 Dwg 4
BT-431141 1920-03-02 7 294.03 KB Make Busy Circuit - Relay Call Indicator Trunk - Full Mechanical Switching System Iss 7 Dwg 7
BT-431151 1921-07-09 8 462.26 KB Coin Collect Circuit - For Long Distance Incoming Cordless Trunks - Arranged for Offices Requiring Breakdown Protection - For Final or Line Switch Multiple Banks - Full Mechanical Switching System Iss 8 Dwg 8
BT-431153 1921-10-20 12 1.08 MB Telephone Circuit - Trunk Supervisor - For Use with Long Distance Cordless Trunk Positions - Arranged for Audible and Visual Signal - Full Mechanical Power Driven System Iss 12 Dwg 12
BT-431156 1922-02-18 5 1.77 MB Final Circuit - With Marginal Relay Test - Full Mechanical Switching System Iss 5 Dwg 6; App 1 Dwg 6
BT-431180 1920-04-09 1 180.47 KB Signal Circuit - Message Register - Full Mechanical Switching System Iss 1 Dwg 1
BT-431181 1921-02-08 5 155.14 KB Signal Circuit - Coin Collect - Full Mechanical Switching System Iss 5 Dwg 5
BT-431182 1920-04-15 4 260.26 KB Signal Circuit - Flashing Re-Call - Full Mechanical Switching System Iss 4 Dwg 4
BT-431183 1921-02-08 3 275.34 KB Signal Circuit - Dialing and Dial Tone to Operator - Full Mechanical Switching System Iss 3 Dwg 3
BT-431184 1921-04-28 8 1010.64 KB Cord Circuit - Zero and Intercepting - Arranged for Flashing Recall and for Dialing - On Line - For Use on M.R. and C.C. Lines - Full Mechanical Switching System Iss 8 Dwg 8
BT-431193 1922-04-29 2 1.62 MB Trunk Circuit - Schematic for Through Wire Local Incoming from Full Mechanical Switching System Iss 2 Dwg 2; App 1 Dwg 3
BT-431199 1926-04-26 4 694.73 KB Selector Circuit - Incoming From Manual Key Indicator - Panel Machine Switching System Iss 4 Dwg 16
BT-431204 1920-03-01 3 501.58 KB Line Circuit - Blank Incoming - For Use as Intercepted Line - Full Mechanical Switching System Iss 3 Dwg 3
BT-431217 1920-03-01 1 239.88 KB Line Circuit - Intercepting - Arranged For Use As Blank Final Line - Or Lines for Deined Service - Full Mechanical Switching System Iss 1 Dwg 1
BT-431220 1921-04-08 2 431.11 KB Two Way - Arranged for Cross-Connection - To Miscellaneous Answering Jack and Lamp At Special "A" Board - Full Mechanical Switching System Iss 2 Dwg 2
BT-431225 1922-02-18 4 2.08 MB Final Selector Circuit - With Marginal Test - Arranged for Routine Subscriber's Line Testing - Full Mechanical Switching System Iss 4 Dwg 4; App 1 Dwg 5
BT-431242 1921-04-27 2 340.75 KB Telephone Circuit - Without Incoming Call Circuit and Checking Multiple - Arranged to Trip Machine Ringing - Full Mechanical Switching System Iss 2 Dwg 2
BT-431249 1921-10-20 2 1.17 MB Trunk Circuit - Incoming From Central Test Desk - Full Mechanical Switching System Iss 2 Dwg 2
BT-431251 1923-05-29 6 1.45 MB Final Selector Circuit - Panel Machine Switching System Iss 6 Dwg 17
BT-431262 1920-04-02 7 185.86 KB Signal Circuit - Interrupted Flash - Selector Frames - Full Mechanical Power Driven System Iss 7 Dwg 7
BT-431278 1923-07-27 4 477.63 KB Signal Circuit Register - Overflow and Peg Count, Panel Machine Switching System Iss 4 Dwg 25
BT-431300 1920-03-01 1 275.15 KB Line Circuit - Test to Last Position Toll or Local Switchboard or Head of Toll Switchboard - Arranged for Cross Connection in Rear of Section - Relays on Relay Rack - Local Test Desk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431301 1920-04-07 4 483.75 KB Telephone Circuit - With Repeatering Coil Monitoring Feature - Arranged for Transfer Key - Local Test Desk - Full Mechanical Power Driven System Iss 4 Dwg 4
BT-431303 1920-03-03 3 269.62 KB Signal Circuit - Auxiliary - Audible Signal - Local Test Desk - Full Mechanical Power Driven System Iss 3 Dwg 3
BT-431304 1920-04-21 2 358.67 KB Ringing Circuit - For Secondary Testing Cord Circuit - Local Test Desk - Full Mechanical Power Driven System Iss 2 Dwg 2
BT-431307 1920-05-27 10 2.14 MB Cord Circuit - Testing - Primary and Secondary - Local Test Desk - Full Mechanical Power Driven System Iss 10 Dwg 10
BT-431308 1920-04-09 3 857.85 KB Trunk Circuits - Incoming Key End - Arranged for Cross Connecting in Rear of Desk - Local Test Desk - Full Mechanical Power Driven System Iss 3 Dwg 3
BT-431310 1921-03-08 3 375.05 KB Line Circuit - Tests to Special "A" Switchboard Zero Position and Sender Monitor - Arranged for Cross Connection in Rear of Section - Relays on Relay Rack - Local Test Desk - Full Mechanical Power Driven System Iss 3 Dwg 3
BT-431311 1921-03-01 2 263.46 KB Signal Circuit - Buzzer and Sounder Equipment - Local Test Desk - Full Mechanical Power Driven System Iss 2 Dwg 2
BT-431312 1920-07-08 2 678.78 KB Wheatstone Bridge Circuit - Local Test Desk - Full Mechanical Power Driven System Iss 2 Dwg 2
BT-431323 1921-07-05 3 538.14 KB Line Circuit - Blank Incoming - For Use as Intercepted Line - Full Mechanical Power Driven System Iss 3 Dwg 3
BT-431328 1919-11-18 1 115.01 KB Line Circuit - Various Answering Jack Arrangements - Special "A" Switchboard - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431330 1922-06-27 5 430.41 KB Line Circuit - Intercepting - Incoming from Final Multiple-Arranged For Use as Blank Final Line - Special "A" Switchboard - Full Mechanical Power Driven System Iss 5 Dwg 5; App 1 Dwg 6
BT-431341 1921-05-31 2 221.69 KB Signal Circuit - Message Register - Special "A" Switchboard - Full Mechanical Power Driven System Iss 2 Dwg 2
BT-431434 1923-06-29 2 6.63 MB Line Finder and Distrcit Selector Circuit Including Line Circuit, Trip Circuit, Starting Circuit, Time Alarm Circuit - Panel Machine Switching System Iss 2 Dwg 2
BT-431447 1920-06-03 1 295.70 KB Motor Stop Alarm and Frame Busy on Selectors - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431449 1923-06-13 3 303.29 KB Signal Circuit - Tell Tale for Use with Line Finders - Panel Machine Switching System Iss 3 Dwg 3
BT-431459 1921-08-02 2 1.31 MB Cord Circuit - Sender Monitoring Position - With Coin Collect Feature - Arranged to Provide Talking Battery to Subscribers When Required - Trouble Desk - Full Mechanical Power Driven System Iss 2 Dwg 2
BT-431461 1920-09-29 6 465.30 KB Telephone Circuit - Sender Monitor's Position - Arranged to Trip Machine Ringing - And to Give Supervision to Zero Operator - With Incoming Call Feature - Trouble Desk - Full Mechanical Power Driven System Iss 6 Dwg 6
BT-431463 1920-07-21 1 402.22 KB Line Circuit - From Local Station - Trouble Desk and Chief Switchman's Desk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431464 1920-06-26 1 211.44 KB Trunk Circuit - Tie Line Between Trouble Desk and Zero Operator - Trouble Desk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431465 1921-07-30 2 249.79 KB Trunk Circuit - Tie Line Between Desks - Trouble Desk and Chief Switchman's Desk - Full Mechanical Power Driven System Iss 2 Dwg 2
BT-431468 1922-06-30 2 443.40 KB Frame Line Circuit - For Talking Between Trouble Desk and District Sender and Translator Frames - Trouble Desk - Full Mechanical Power Driven System Iss 2 Dwg 2; App 1 Dwg 3
BT-431470 1921-03-28 1 432.52 KB Signal Circuit - Auxiliary and Night Alarm - Trouble Desk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431471 1920-06-28 1 275.23 KB Line Circuit - To Supervisor - From Trouble Desk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431472 1928-09-13 3 458.00 KB Trunk Circuit - Two Way - To Final Multiple and Line Switch - Trouble Desk and Chief Switchman's Desk - Full Mechanical Power Driven System Iss 3 Dwg 13
BT-431484 1921-03-12 1 429.51 KB Trunk Circuit - Verifying - Incoming From Final Multiple - Use Where Zero Operator's Trunks Have 34 Ohm Sleeve - Special "A" Switchboard - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431501 1921-03-01 2 470.12 KB Line Circuit - Test and Plugging Up - In Connection with Jack Box at M.D.F. - Full Mechanical Power Driven System Iss 2 Dwg 2
BT-431523 1921-04-27 1 282.16 KB Signal Circuit - Fuse Alarm and Auxiliary Busy Back Ground Alarm - Without Aisle Pilot Lamp with Secondary - Signals at Floor Alarm and Main Alarm Boards - Selector Frames - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431524 1921-04-26 1 327.74 KB Signal Circuit - Selector Time Alarm - Without Aisle Pilots - With Secondary Signals at Floor Alarm and Main Alarm Boards - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431528 1921-07-06 2 260.68 KB Signal Circuit - Selector Time Alarm - Arranged for One-Half to Four Minute Periods - Full Mechanical Power Driven System Iss 2 Dwg 2
BT-431551 1920-07-19 1 482.86 KB Telephone Circuit - For Outgoing Trunk Test Position - Arranged for Use with Loud Speaking Circuit - Not Arranged for Transfer Key - Trouble Desk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431591 1921-03-23 1 324.16 KB Signal Circuit - Line or Cord Auxiliary Relay - For Use with Line Circuits Requiring Grounded Auxiliary Relays - Alarm Type Fuses in Section - Special "A" Board - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431607 1921-03-14 1 332.30 KB Telephone Circuit - Supervisor - "A" Position Switchboard - Arranged to Connect to Trouble Desk - For Use Where Zero Operator's Trunks Have 34 Ohm Sleeve - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431613 1921-02-17 1 336.21 KB Trunk Circuit - Tie Line From Desks - For Use Where Zero Operator's Trunk Has a 34 Ohm Sleeve - "A" Position Switchboard - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431628 1925-05-16 3 6.71 MB Line Circuit - Trip Circuit - Start Circuit - Line Finder Circuit District Selector Circuit & Time Alarm Circuit - Arranged for Two Party Message Register Lines - Panel Machine Switching System Iss 3 Dwg 37; App 1 Dwg 42
BT-431629 1935-09-20 3 6.77 MB Line Circuit - Trip Circuit - Start Circuit - Time Alarm Circuit - District Selector Circuit and Line Finder Circuit - Arranged for Coin Box or Non-Coin Lines - Panel System Iss 3 Dwg 38; App 1 Dwg 46; App 2 Dwg 53
BT-431718 1921-07-29 1 504.19 KB Telephone Circuit - Arranged to Give Busy and Check Tone - Test Where Zero Operator's Cord Requires 37 Ohm Outgoing Trunk Sleeves - Without Incoming Call Circuit - Special A Switchboard - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431720 1921-04-05 1 264.67 KB Tripping Circuit - Arranged to Trip Machine Ringing - Before Operator Listens In - "A" Positions Switchboard - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431721 1921-03-12 1 261.43 KB Signal Circuit - Flashing Recall - "A" Positions Switchboard - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431740 1926-04-17 5 2.52 MB Trunk Test Circuit - Trouble Desk - Panel Machine Switching Circuit Iss 5 Dwg 27; App 1 Dwg 28
BT-431741 1923-11-25 2 358.02 KB Line Circuit Arranged to Provide Night Service for P.B.X. Lines on Separate Final Multiple - Panel Machine Switching System Iss 2 Dwg 5
BT-431746 1921-01-05 1 583.11 KB Test Line - From District or Office Frames - Relays at Miscellaneous Relay Racks - Local Test Desk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431751 1921-07-28 5 655.72 KB Holding Line Circuit - To Permanent Signal - Sender Monitor Operator - Trouble Desk - Full Mechanical Power Driven System Iss 5 Dwg 5
BT-431752 1922-02-02 4 763.21 KB Howler Cord Circuit - Sender Monitor Operator - Trouble Desk - Full Mechanical Power Driven System Iss 4 Dwg 4; App 1 Dwg 5
BT-431753 1920-10-05 1 230.62 KB Overflow Register Circuit - Permanent Signal Trunk Group - Sender Monitor Operator - Trouble Desk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-431770 1922-01-27 1 10.22 MB Sender Circuit - Subscribers' Schematic Two Digit Office Code - Power Driven Machine Switching System Iss 1 Dwg 1
BT-438059 1921-02-26 5 421.12 KB Howler Circuit - With Graduated Howler Key - For Use with Test Circuit - Local Test Desk #12 Iss 5 Dwg 5
BT-438069 1921-01-21 8A 239.76 KB Signal Circuit - Night Alarm - For Subscribers and Trunk Switchboard - Relay Switchboard #1 - Toll Switchboard #1 Iss 8A Dwg 8A
BT-438465 1920-02-20 1 649.84 KB Telephone Circuit - With Single Ended Cord - For Listening and Monitoring - With Repeating Coil Monitoring Feature - Arranged for Machine Ringing and for Dialing Full Mechanical Office - Special Chief Operator's Desk - The Southwestern Telephone and Telegraph Company Iss 1 Dwg 1
BT-438462 1921-05-21 3 264.66 KB Trunk Circuit - Incoming Ringdown - From Final Multiple - Special Chief Operator's Desk - Full Mechanical Power Driven System Iss 3 Dwg 3
BT-438463 1920-04-20 3 244.82 KB Trunk Circuit - Tie Line Automatic - Special Chief Operator's Desk - Machine Switching System Iss 3 Dwg 3
BT-438472 1921-05-25 3 301.36 KB Trunk Circuit - Incoming Automatic From O.G.T. Multiple - Outgoing to Answering Jack - Special Chief Operator's Desk - Machine Switching System Iss 3 Dwg 3
BT-438481 1921-02-08 3 178.55 KB Signal Circuit - Coin Collection - Relay Equipment Only - Relay Switchboard #1 Iss 3 Dwg 3
BT-438517 1920-03-25 1 2.03 MB Schematic - Test and Sender Circuits - Outgoing Trunk Test Board - Machine Switching System Iss 1 Dwg 1
BT-438520 1920-03-27 3 221.40 KB Trunk Circuit - Two Way Automatic - Special Outgoing Trunk Test Board - Machine Switching System - Southwestern Bell Telephone Company Iss 3 Dwg 3
BT-438521 1920-04-20 1A 188.17 KB Line Circuit - To Supervisors - Special Outgoing Trunk Test Board - Machine Switching System - Southwestern Bell Telephone Company Iss 1A Dwg 1A
BT-438522 1920-03-29 4 309.63 KB Line Circuit - To Local Station - Special Outgoing Trunk Test Board - Machine Switching System - Southwestern Bell Telephone Company Iss 4 Dwg 4
BT-438523 1920-04-12 1A 253.98 KB Trunk Circuit - To Final Multiple - Key Ended - Special Outgoing Trunk Test Board - Chief Switchman's Desk - Machine Switching System - Southwestern Bell Telephone Company Iss 1A Dwg 1A
BT-438524 1920-04-20 1A 275.48 KB Telephone Circuit - Special Outgoing Trunk Test Board - Machine Switching System - Southwestern Bell Telephone Company Iss 1A Dwg 1A
BT-438526 1921-03-03 3 976.09 KB Cord Circuit - Voltmeter Test - Trouble Desk - Power Driven Machine Switching System Iss 3 Dwg 3
BT-438528 1921-06-25 2 459.31 KB Telephone Circuit - Sender Monitor - Special Outgoing Trunk Test Board - Machine Switching System - Southwestern Bell Telephone Company Iss 2 Dwg 2
BT-438537 1920-04-20 1A 240.21 KB Test & Plugging Up - In Connection with Jack Boxes at M.D.F. - Special Outgoing Trunk Test Board - Machine Switching System - Southwestern Bell Telephone Company Iss 1A Dwg 1A
BT-438538 1921-05-31 5 558.08 KB Fuse Alarm - With Drop or Lamp Signal - Machine Switching System - Southwestern Bell Telephone Company Iss 5 Dwg 5
BT-438541 1920-03-04 6 288.18 KB Signal Circuit - Auxiliary - Special Outgoing Trunk Test Board - Machine Switching System Iss 6 Dwg 6
BT-438581 1920-05-26 1 444.42 KB Telephone Circuit - Arranged for Dialing - Machine Switching System - Repair Clerk's Desk #1 Iss 1 Dwg 1
BT-438582 1921-02-03 2 282.50 KB Signal Circuit - Buzzer - Machine Switching System - Repair Clerk's Desk #1 Iss 2 Dwg 2
BT-438583 1920-04-06 1 928.87 KB Trunk Circuit - Keys for Listening and Holding - Relays on Relay Rack - Machine Switching System - Repair Clerk's Desk #1 Iss 1 Dwg 1
BT-438586 1921-07-21 5 658.64 KB Telephone Circuit - Single Ended Cord - For Listening Monitoring and Dialing - With Repeating Coil Monitoring Feature - Arranged for Machine Ringing and 24 Induction Coil and Desk Stand - Operating Room Desk #15 Iss 5 Dwg 5
BT-438612 1921-05-26 2 232.06 KB Sender Monitor - Without Ringing and Incoming Call Circuit Feature - Outgoing Trunk Test Board - Machine Switching System Iss 2 Dwg 2
BT-438617 1920-09-10 4 164.07 KB Signal Circuit - Unit Drive Motor - Stop Alarm and Frame Busy on Selectors - Machine Switching System - Outgoing Trunk and Sender Monitoring Test Board Iss 4 Dwg 4
BT-438798 1920-05-14 1 191.83 KB Test Set Circuit - Relay Adjusting Test Set - For Testing Various Relays in Full Mechanical - Relay Call Indicator and P.B.X. Circuits - Relay Switchboard #1 and Machine Switching Systems Iss 1 Dwg 1
BT-441127 1923-07-12 2 371.69 KB Line Circuit - Subscribers, Semi-Mechanical with Answering Jacks and Final Multiple - Special "A" Switchboard - Panel Machine Switching System Iss 2 Dwg 2
BT-441132 1923-03-04 2 1.43 MB Selector Circuit - Inter-Office Incoming From Full Mechanical - 4 Party Semi-Selective Ringing - Power Driven Machine Switching System Iss 2 Dwg 2
BT-441139 1923-06-25 2 1.77 MB District Selector Circuit - From Special "A" Operator, For Use Where Zero Operators Trunk Have a 34 Ohm Sleeve - Panel Machine Switching System Iss 2 Dwg 19
BT-441153 1921-07-25 1 439.70 KB Make Busy Circuit - Relay Call Indicator Trunk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-441174 1921-03-11 1 248.32 KB Call Circuit - Incoming with Audible and Flash Signal - Special "A" Switchboard - Power Driven Machine Switching System Iss 1 Dwg 1
BT-441193 1923-11-02 2 952.64 KB Miscellaneous Alarm Signal Circuit O.G.T. Test Board - Panel Machine Switching System Iss 2 Dwg 25
BT-441196 1921-04-11 1 542.35 KB Telephone Circuit - Arranged to Give Busy and Check Tone - Test Where Zero Operator's Cord Requires 37 Ohms O.G.T. Sleeves - Arranged for Incoming Call Circuit - Special "A" Switchboard - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-501002 1922-12-01 1 3.73 MB Schematic For Sender Recording Key and Testing Cord Circuit - Local Test Desk - Full Mechanical Power Driven System Iss 1 Dwg 1; App 1 Dwg 2; App 2 Dwg 3; App 3 Dwg 4; App 4 Dwg 21
BT-501003 1923-07-18 1 47.56 MB Line Finder and Distrcit Selector Circuit Including Line Circuit, Trip Circuit, Starting Circuit, Time Alarm Circuit - For Flat or Individual Message Rate Lines - Full Mechanical Power Driven System Iss 1 Dwg 1; App 1 Dwg 2; App 2 Dwg 3; App 3 Dwg 4; App 4 Dwg 5; App 5 Dwg 6
BT-501019 1923-11-01 4 2.31 MB Schematic - Service Observing Circuit - For Panel and Step by Step Machine Switching Offices Iss 4 Dwg 19
BT-501025 1924-04-01 1 764.99 KB Coin Control Circuit - For Long Distance Cordless Trunks - Arranged for Offices Requiring Ringdown Protection - For Final Multiple Banks - Panel Machine Switching Iss 1 Dwg 1; App 1 Dwg 20
BT-501048 1923-07-27 2 1.74 MB Incoming Trunk Sender - For Calls from Automatic Office and Manual Operator Panel Machine Switching System Iss 2 Dwg 10
BT-501077 1921-06-17 1 384.78 KB Telephone Circuit - Repair Clerk's Desk #1 - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-501089 1921-04-13 1 345.19 KB Telephone Circuit - With Loud Speaking Circuit - Arranged for Transfer Key - Local Test Desk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-501091 1922-06-20 3 1.18 MB Testing Circuit - Wiring of a 50-A Dial Tester - Local Test Desk - Full Mechanical Power Driven System Iss 3 Dwg 3; App 1 Dwg 4
BT-501129 1921-05-16 1 240.73 KB Trunk Circuit - Incoming from Outgoing Trunk Multiple and Outgoing to Answering Jack - Chief Operator's or Assistant Chief Operator's Desk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-501145 1937-12-31 4 12.56 MB Routine Selector Test Circuit - Wagon Type - For Testing Office Incoming and Final Selectors - Panel System Iss 4 Dwg 30; App 1 Dwg 35
BT-501158 1922-09-18 1 54.63 MB Schematic - For Automatic Routine Test of Final Selectors - Automatic Routine Selector Test Frame - Power Driven Machine Switching System Iss 1 Dwg 1; App 1 Dwg 2; App 2 Dwg 3
BT-501197 1921-05-11 1 299.53 KB Auxiliary Signal Circuit - Repair Clerk's Desk - Full Mechanical Power Driven System Iss 1 Dwg 1; App 1 Dwg 2
BT-501198 1921-05-21 1 1.29 MB Trunk Circuits - Miscellaneous - Repair Clerk's Desk - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-501198 1928-09-10 3 1.45 MB Trunk Circuit - Miscellaneous - Repair Clerk's Desk - Panel System Iss 3 Dwg 30
BT-501319 1923-05-14 3 718.31 KB Sender Selector - For Stuck Senders - To Be Used with Subscriber's Districts, and Operator's Dialing Districts - Panel Machine Switching System Iss 3 Dwg 11
BT-501319 1931-12-07 5 763.53 KB District Finder Circuit - To be Used with Subscriber's Districts and Operator's Dialing Districts - Panel System Iss 5 Dwg 16
BT-501345 1921-07-06 1 293.10 KB Test Set Circuit - For Routine Testing of District Selectors - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-501445 1935-04-22 3 1.67 MB Panel System - Testing Circuit - Schematic - For Line Finder Starting Test Set Iss 3 Dwg 19
BT-501455 1923-06-21 2 1.99 MB Test Circuit - Final Multiple Test Lives [sic - Lines], For Testing Incoming Selector Circuits Having Four Party Semi Selector A.C. Ringing - 95-110 Volts - Automatic Routine Selector Test Frame - Power Division Mechanical Switching Iss 2 Dwg 2
BT-501456 1921-10-19 1 205.83 KB Testing Circuit - Final Test Line Switching for Routine Test of Final Selectors - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-501457 1923-11-10 4 4.84 MB Routine Test of Subscribers District Selectors, Line Finder Type - Automatic Routine Selector Test Frame - Panel Machine Switching System Iss 4 Dwg 27
BT-502025 1921-04-06 1 269.26 KB Signal Circuit - Motor Stop Alarm and Frame Busy on Selectors - For Use with Line Finders - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-502027 1923-06-26 2 407.10 KB Signal Circuit - Selector Time Alarm - Without Aisle Pilots - With Secondary Signals at Floor Alarm and Main Alarm Boards - Arranged for Power Cable Terminal Strip - Panel Machine Switching System Iss 2 Dwg 22
BT-502029 1923-06-25 2 361.85 KB Signal Circuit - Fuse Alarm and Auxiliary Busy Back Ground Alarm Without Aisle Pilot Lamp with Secondary Signals at Floor Alarm and Main Alarm Boards - Selector Frames - Panel Machine Switching System Iss 2 Dwg 30
BT-502147 1921-08-20 1 547.21 KB Trunk Circuit - Miscellaneous - Local Test Desk - Small Capacity - Power Driven Machine Switching System Iss 1 Dwg 1
BT-502148 1921-08-18 1 327.65 KB Line Circuit - Test to Trouble Desk - With Supervision - Local Test Desk - (Small Capacity) - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-502149 1921-09-23 1 434.10 KB Test Line - From District or Office Frames - Local Test Desk - Small Capacity - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-502150 1921-11-07 1 459.19 KB Line Circuit - Test to Incoming Test Selector - Local Test Desk - Small Capacity - Power Driven Machine Switching System Iss 1 Dwg 1
BT-502151 1921-10-20 1 769.86 KB Testing to M.D.F. and I.D.F. - For Detection of Intermittent Trouble - Local Test Desk - (Small Capacity) Power Driven Machine Switching System Iss 1 Dwg 1
BT-502167 1923-05-03 2 1.45 MB Final Selector Circuit - With Time Measure Release on Permanent Signals, and Arranged With or Without Routine Testing on Subscriber's Line - Power Driven Machine Switching System [Incomplete] Iss 2 Dwg 2
BT-502170 1922-01-28 1 3.19 MB Selector Circuit - Incoming From Toll Key Indicator - Direct Two and Four Party Semi-Selective Ringing - Power Driven Machine Switching System Iss 1 Dwg 1
BT-502172 1925-02-23 2 15.80 MB Selector Circuit - Incoming From Key Indicator - Incoming From Full Mechanical Four Party Semi-Selective Ringing - Panel Machine Switching System Iss 2 Dwg 12; App 1 Dwg 21
BT-502173 1923-10-05 3 12.02 MB Selector Circuit - Incoming From Spl. "A" Switchboard with No Test Keys at "A" Position - Panel Machine Switching System Iss 3 Dwg 14
BT-502210 1923-01-17 1 4.57 MB Signal Circuit - Register - Overflow and Peg Count - Power Driven Machine Switching System Iss 1 Dwg 1
BT-502221 1922-02-11 1 3.21 MB Trunk Circuit - Three Wire Incoming to Zero Operator - Arranged to Relight Lamp if Coin is Not Released - Special "A" Switchboard - Power Driven Machine Switching System Iss 1 Dwg 1
BT-502222 1921-09-21 1 10.11 MB Trunk Circuit - Outgoing to Recording Operator - Arranged to be Called by Mechanical Subscribers or Special "A" Operator - Arranged to Compensate for Ground Potential and Differences in Office Battery Voltage - Special "A" Switchboard - Power Driven Machine Switching System Iss 1 Dwg 1
BT-502262 1921-10-29 1 1.43 MB Test Circuit - Final Multiple Test Line, for Testing Incoming Selective Circuits Having Four Party Semi Selector A.C. Ringing - 95 to 110 Volts - Automatic Routine Selector Test Frame - Power Division Machine Switching System Iss 1 Dwg 1
BT-502263 1922-03-16 1 1.53 MB Test Circuit - Final Multiple Test Lines for Testing Incoming Selector Circuits (Mechanical) Having Four Party Semi-Selective AC Ringing - 95 - 110 Volts - Automatic Routine Selector Test Frame - Power Division Machine Switching System Iss 1 Dwg 1
BT-502272 1921-11-04 1 603.95 KB Trunk Circuit - Ring-Down Intercepting - Arranged for Routine Instructions on Defective Final Multiple Bank Terminals - Special "A" Switchboard - Power Driven Machine Switching System Iss 1 Dwg 1
BT-502296 1923-06-23 2 3.53 MB Signal Circuit - Motor Stop Alarm and Frame Busy on Selectors - For Use with Line Finders - Panel Machine Switching System Iss 2 Dwg 33
BT-502305 1923-10-29 2 40.37 MB Schematic - Sender Circuit - Subscribers - 2 Digit Office Code - Panel Machine Switching System Iss 2 Dwg 26; App 1 Dwg 26; App 2 Dwg 28; App 3 Dwg 35
BT-502354 1922-03-06 1 787.85 KB Make Busy Circuit - Relay Call Indicator Trunks - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-502376 1925-05-21 2 28.88 MB Automatic Routine Sender Test Frame - For 2 Digit Subscriber's Senders - Panel Machine Switching Iss 2 Dwg 37; App 1 Dwg 39
BT-502376 1929-03-28 3 26.67 MB Automatic Routine Sender Test Frame - For 2-Digit Subscriber's Senders - Panel Machine Switching System Iss 3 Dwg 45
BT-502492 1923-07-18 1 18.97 MB Panel Line Finder - Line Circuit - Trip Circuit - Start Circuit - Time Alarm Circuit - District Selector Circuit and Line Finder Circuit - Arranged for Coin Box Lines - With or Without Message Register - Panel Machine Switching System Iss 1 Dwg 1; App 1 Dwg 2; App 2 Dwg 3; App 3 Dwg 4; App 4 Dwg 18; App 5 Dwg 20
BT-502494 1923-07-27 2 25.65 MB Line Circuit, Trip Circuit, Start Circuit, Line Finder Circuit, District Selector Circuit, and Time Alarm Circuit Arranged for Two Party Message Register - Panel Machine Switching System Iss 2 Dwg 21
BT-502733 1923-10-22 1 13.72 MB Schematic for District Selector Circuit - Line Finder Circuit - Line Circuit - Trip Circuit - Starting Circuit and Time Alarm Circuit - Arranged for Flat Rate or Indicating Message Rate Lines - Panel Machine Switching System Iss 1 Dwg 9; App 1 Dwg 10
BT-502793 1922-06-22 1 398.51 KB Signal Circuit - Group Busy for Subscribers Senders - With Audible Signal - Trouble Desk - Power Driven Machine Switching System Iss 1 Dwg 1
BT-502795 1923-08-30 2 316.81 KB Signal Circuit - Interrupted Flash - Selector Frames - Panel Machine Switching System Iss 2 Dwg 9
BT-502841 1922-09-22 1 712.57 KB Signal Circuit - Line or Cord Auxiliary Relay - For Use with Line Circuits Requiring Grounded Auxiliary Relays - Alarm Type Fuses in Section - Special "A" Board - Full Mechanical Power Driven System Iss 1 Dwg 1
BT-512030 1924-10-18 1 1.46 MB Line Circuit-Subscribers - Incoming Mechanical - Outgoing Manual - Panel Machine Switching System Iss 1 Dwg 1; App 1 Dwg 5
BT-512577 1923-11-08 1 460.74 KB Fuse Alarm Circuit - Subscribers Sender Frames - Panel Machine Switching System Iss 1 Dwg 1
BT-512581 1923-11-19 1 558.33 KB Motor Stop and Frame - Busy Circuit - Unit Type Subscriber Sender Frames - Panel Type Machine Switching System Iss 1 Dwg 1
BT-512618 1928-02-16 3 1.02 MB Line Circuit - Holding - Arranged for Permanent Signal with Make Busy - Jack - Sender Monitor Operator - Trouble Desk - Panel System Iss 3 Dwg 8
BT-512773 1924-02-25 1 622.15 KB Signal Circuit - Motor Stop and Frame Busy - Relays Mounted on Interrupter Unit - Subscribers Sender Frame - Panel Machine Switching System Iss 1 Dwg 2
BT-514023 1929-04-16 1 7.87 MB Automatic Routine Test of Final Selectors - Automatic Routine Selector Test Frame - Panel System Iss 1 Dwg 1; App 1 Dwg 2