Bell System Schematic Drawings (SDs)

Section Date Issue Size Title
SD-15120-011953-12-04141.63 MBManual Systems - Switchboard No. 12 - Key Sheet
SD-1A110-011980-07-1410D527.60 KBElectronic Switching Systems - Common Junctor Circuit
SD-1A246-011983-11-0410B1.12 MBElectronic Switching Systems - Common MF Receiver Circuit
SD-1A277-011985-04-2411D270.00 KBElectronic Switching Systems - Common Dial Tone Delay Alarm Circuit
SD-1C900-011979-02-148A174.98 MBCommon Systems - 3A Central Control Circuit
SD-1C901-011977-06-034D2.56 MBCommon Systems - 3ACC Control Panel Circuit
SD-1C902-03158.01 MBCommon Systems - Main Store Controller and Memory Circuit
SD-1C903-011977-08-082D7.56 MBCommon Systems - Main Store Memory Circuit
SD-1C904-011977-07-195AC10.51 MBCommon Systems - Tape Data Controller Circuit
SD-1C905-011978-12-287AC8.14 MBCommon Systems - Teletypewriter Controller Unit Circuit
SD-1C906-011977-07-015B2.81 MBCommon Systems - System Status Panel Circuit
SD-1C907-011977-06-015D11.78 MBCommon Systems - System Status Panel Controller Circuit
SD-1D243-011978-05-246B11.01 MBData Systems Station - Data Set 202T Type, 39A1 Data Mounting and 40B1 Data Mounting
SD-1D295-011986-09-026A1.85 MBData Systems Station - 63 and 64 Type Data Mountings
SD-1S005-011995-07-283M1.18 MBElectronic Switching Systems - AINet Service Circuit Node - DC Control Computer Version Circuit
SD-1S006-011995-05-122M315.28 KBElectronic Switching Systems - AINet Service Control Point - DC Control Computer Version Circuit
SD-1S007-011997-01-202M554.28 KBElectronic Switching Systems - Advanced Network Services - Service Circuit Node - Advantage Control Server Circuit
SD-1S008-011997-01-202M962.84 KBElectronic Switching Systems - Advanced Network Services - Service Control Point - Advantage Control Server Circuit
SD-1S009-011997-02-212394.07 KBAdvanced Network Services - Advantage Telecom Server Circuit
SD-1S010-011998-03-011409.02 KBElectronic Switching Systems - Advanced Network Services - Service Node and Service - Control Point Systems Circuit
SD-1S011-011998-10-021104.31 KBAdvanced Network Services - Advantage Compact Service Node
SD-25760-011958-07-11104.99 MBCrossbar Systems - No. 5 - Key Sheet
SD-2P077-011988-03-0115A1.94 MBOperations Support Systems - Common - Directly Connected Test Unit Circuit
SD-30243-011972-10-1122D244.87 KBStep By Step Systems - No. 1, 350A, 355A or 35E97 - Test Connector Circuit for Use in Testing Subscriber Lines and for Use in Verification Service
SD-30903-011967-03-0610AR613.36 KBStep By Step Systems - 35-E-97 - Local Connector Circuit - One Ring - Generator Connected to Ground or to Battery
SD-30976-011976-09-0323B1.07 MBStep 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 Specified Levels - No. 1 or 350A - Arranged for Use as First Selector for 2 Party Message Rate Service - No. 355A or 356A - Arranged for Timed Release on Permanent Signal
SD-30978-011971-03-0510B479.79 KBStep 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-Selecting Ringing Arranged for 2 Digit Operation
SD-31250-011937-06-1717473.60 KBStep By Step System - 360-A Dial Office - Key Sheet
SD-31337-011980-10-1416D700.73 KBStep-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
SD-31359-011959-08-03405.63 MBStep By Step Systems - No. 1 Key Sheet
SD-31359-021965-07-2652.31 MBStep By Step Systems - No. 1 - Current Drain Data
SD-31592-021982-04-1538A972.16 KBStep By Step Systems - No. 1, 350A, 355A, 360A or 25E97 - Coin Trunk Circuit for Use Preceeding a First Selector Serving Prepayment Coin Lines Arranged for Delayed Charging
SD-31606-011972-04-2126D1.94 MBStep By Step Systems - No. 1 or 350A - 30, 60 and 120 I.P.M. Interrupter and Interrupter Alarm Circuits
SD-31739-011972-11-2719D784.72 KBStep-By-Step Systems - No. 1, 350A or 355A - Combination Connector Circuit - One Ring With or Without Reverse Battery Supervision
SD-31771-011979-12-1516B3.79 MBStep 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
SD-31779-011980-07-1528B1.42 MBStep By Step Systems - No. 1, 350A, 355A, 360A or 35-E-97 Outgoing Repeater Circuit - Battery and Ground or Loop Pulsing - Loop Supervision - Arranged for 2 Repeaters per Base and for Temporary Use to Call Indicator Office
SD-31780-01164.21 MBGeneral Description of the 355A Dial Office
SD-31848-011954-09-0116D1.69 MBStep By Step Systems - No. 1, 350A, 355A or 356A - Crossbar Systems No. 5 - Line Adapter Circuit - Multi Party for Use with Grounded Lines or Low Insulation Meltallic Lines - Pulse Correction and Relayed Ringing
SD-32043-011967-07-1028D86.01 MBStep By Step Systems - No. 1 or 350A - Switch Trouble Alarm Circuit - Selector Shelf Circuits - No. 355A Miscellaneous Alarm Circuit - Selector Shelf Circuits
SD-32133-011983-12-1425B1.65 MBStep By Step Systems - No. 1, 350A, 355A, 360A or 35-E-97 - Subscriber Line Circuit
SD-33013-011972-09-2210D1.41 MBStep By Step Systems - No. 1, 350A, 355A, 360A or 35E96 - 200 Point Line or Trunk Finder - 3 Wire
SD-35004-011991-05-016D1.75 MBStep By Step Systems - No. 1, 350A, 355A, 356A, 360A, 35E97 - Trunk Circuit for "911" Emergency Service
SD-3C292-011987-08-0614M2.64 MBCommon Systems - 660 Communication Panel Circuit
SD-3F027-011990-01-237B563.92 KBSignaling and Packet Switching System - Common Network Interface - Digital Facility Access Cabinet Circuit
SD-3H911-011982-01-283BU336.69 KBElectronic Switching Systems - No. 3 Distribute Point Applique Circuit
SD-3T003-011992-11-303A1.20 MBCommon Systems - 3B20D Model 3 Processor - SCSI Growth or Conversion Unit Circuit
SD-3T004-011993-02-0212.75 MBCommon Systems - 3B20D Model 2 & 3 Processor - Small Computer Systems Interface (SCSI) New Ship Unit Circuit
SD-3T011-011999-01-086B2.22 MBCommon Systems - 3B21D Computer - Processor Unit Circuit
SD-3T012-011995-10-033B3.09 MBCommon Systems - 3B21D Computer - Growth Unit Circuit
SD-3T015-011995-10-112B1.54 MBCommon Systems - 3B21D Computer - Computer Systems Circuit
SD-4A153-011996-12-182M17.56 KBElectronic Switching System - 4ESS - 1B Processor Complex and Units Condensed Circuit
SD-4C053-011984-05-085A648.99 KBCommon Systems - AT&T 3B20D Models 1, 2 and 3 Computer - AC & DC Power Distribution Circuit
SD-4C065-011987-12-104M685.74 KBCommon Systems - 3B20D Models 1, 2 & 3 Processor - Port Switch Unit Circuit
SD-4C097-011990-07-199B2.58 MBCommon Systems - 3B20D Model 2 & 3 Processor - Main Store and IOP Growth Unit Circuit
SD-4C098-011985-03-2713B3.06 MBCommon Systems - 3B20D Model 2 and 3 Processor - Central Processing Unit Circuit
SD-4C099-011991-11-0514M3.55 MBCommon Systems - 3B20D Model 2 & 3 Processor - Main Store, IO and DFC Unit Circuit
SD-4C101-011992-02-2811M2.57 MBCommon Systems - 3B20D Model 2 & 3 Processor - IO Processor Basic Unit Circuit
SD-4C102-011984-04-182B375.81 KBCommon Systems - 3B20D Model 2 Processor - Power Distribution Unit Circuit
SD-4C115-011986-04-177AC2.85 MBCommon Systems - 3B20S Model 2 Processor - IO Processor and DFC Controller Unit Circuit
SD-4C119-011990-11-309B8.33 MBCommon Systems - 3B20D Model 2 & 3 Processor - Processor Control Cabinet Circuit for 5ESS
SD-4C120-011984-02-292B236.39 KBCommon Systems - 3B20D Model 2 Processor - Tape Unit Cabinet Circuit
SD-4C122-011993-02-2310B1.30 MBCommon Systems - 3B20D Model 2 & 3 Processor - Processor System Cabinet for 5ESS
SD-4C126-011984-09-243B911.35 KBCommon Systems - 3B20D Model 3 Processor - Tape/Disk Cabinet
SD-4C127-011994-04-1115B2.40 MBCommon Systems - 3B20D Model 3 Computer - Computer System Circuit
SD-55031-011974-07-0111D259.78 KBToll Systems - Toll Testboard No. 18B - Primary Test Circuit
SD-55032-011976-09-099D237.48 KBToll Systems - Toll Testboard No. 18B - Telephone Circuit
SD-55200-011941-06-103476.98 KBToll Systems - Toll Switchboard No. 3CF - Key Sheet
SD-55879-011966-09-1616D940.70 KBToll Systems - Switchboard No. 3C or 3CL - Toll Testboard No. 17B or 18B - Testboard No. 17E, 19A, or 21A - Test Unit No. 5A - Outgoing Trunk Circuit - MF Key Pulsing or Straightforward Reverse Battery or Wet Dry Supervision - 20 Cycle Simplex or No Ringing Start Signal With or Without Coin Control
SD-59070-011942-07-272642.86 KBToll Systems - Telephone Repeater - V1 Telephone Repeater - Key Sheet
SD-59070-021950-05-2612.66 MBToll Systems - Telephone Repeater - "V3" Telephone Repeater - Key Sheet
SD-5D001-011997-01-097M1.17 MB5ESS Switching System - Floorplan Data
SD-5D001-022001-01-168M275.36 KB5ESS Switching System - Floorplan Data for the 5ESS-2000 Switch Cabinet
SD-5D002-012000-03-1713M356.42 KB5ESS & 7R/E - Current Drain Data
SD-5D003-011984-06-191350.00 KB5ESS Switching Equipment - Limiting Conductor Specification
SD-5D004-011993-08-188B791.29 KBElectronic Switching Systems - 5ESS - AC Power Distribution Circuit
SD-5D005-011993-08-1816B2.50 MB5ESS Switching Equipment - DC Power Distribution Circuit
SD-5D007-011999-05-1334M520.26 KB5ESS Switching Equipment - Assignment Rules
SD-5D008-011994-04-269B931.44 KB5ESS Switching Equipment - Office Alarm Unit Circuit
SD-5D011-011985-08-144D436.12 KB5ESS Switching Equipment - Data Set Application Schematic Circuit
SD-5D012-011984-08-164D451.95 KB5ESS Switching Equipment - Interface Module Application Schematic
SD-5D012-021996-08-2013B1.41 MB5ESS Switching Equipment - Switching Module Application Schematic
SD-5D014-011986-02-116D579.43 KB5ESS Switching Equipment - Application Schematic for 5ESS System (7 Ft. Frames and Cabinets)
SD-5D014-021998-03-1837M2.42 MB5ESS Switching Equipment - Application Schematic for 5ESS System (6 Ft. Cabinets)
SD-5D015-011992-09-168B3.74 MB5ESS Switching Equipment - Modular Metallic Service Unit Circuit
SD-5D016-0118.30 MB5ESS Switching Equipment - Modular Metallic Service Unit Interconnection
SD-5D017-011995-01-1912B1.19 MB5ESS Switching Equipment - Audible and Visual Alarm Circuit
SD-5D019-011991-10-313B115.54 KB5ESS Switching Equipment - Fan Unit and Alarm Circuit
SD-5D019-021991-10-313B280.66 KB5ESS Switching Equipment - 3 Fan Unit and Alarm Circuit for 6 Foot Cabinet
SD-5D026-011984-04-235A1.81 MB5ESS Switching Equipment - Message Switch Control Unit Circuit
SD-5D035-011985-08-088B2.01 MB5ESS Switching Equipment - Digital Service Unit Circuit
SD-5D037-011987-07-086B1.18 MB5ESS Switching Equipment - Time Multiplexed Switch Control Unit Circuit
SD-5D043-011986-12-136B4.01 MB5ESS Switching Equipment - Time Multiplexed Switch Unit Circuit
SD-5D044-011995-03-179M1.06 MB5ESS Switching Equipment - Resistor Panel Circuit
SD-5D045-011986-10-1412D6.31 MB5ESS Switching Equipment - Time Slot Interchanger Unit Model 2 Circuit
SD-5D048-011996-05-289B958.96 KB5ESS Switching Equipment - Memory Expansion Unit Circuit
SD-5D052-021987-01-294B3.07 MB5ESS Switching Equipment - Line Unit, Model 2 Circuit
SD-5D053-011990-06-209M471.36 KB5ESS Switching Equipment - Fuse / Filter Panel Circuit
SD-5D060-011997-10-0914M3.99 MB5ESS Switching Equipment - Communication Module Control Unit Circuit
SD-5D061-011997-07-119M1.16 MB5ESS Switching Equipment - Time Multiplexed Switch Unit Model 2 Circuit
SD-5D064-011987-09-173B1.30 MBElectronic Switching Systems - 5ESS - Operator Services Position System - Link Adapter Unit
SD-5D066-011986-01-082A2.28 MB5ESS Switching Equipment - Message Switch Peripheral Unit, Model 2
SD-5D070-011984-10-301145.62 KB5ESS Switching Equipment - +48V DC Power Distribution Circuit
SD-5D071-011998-03-3116M1.36 MB5ESS Switching Equipment - Operating Support Systems Interface Circuit
SD-5D074-011995-03-0112B3.58 MB5ESS Switching Equipment - Packet Switch Unit Circuit
SD-5D075-011999-10-1413B1010.20 KB5ESS Switching Equipment - Remote Clock Unit Circuit
SD-5D077-011997-09-265M4.41 MB5ESS Switching Equipment - Message Switch Control Unit Model 2 Circuit
SD-5D078-011997-09-266M3.00 MB5ESS Switching Equipment - Message Switch Peripheral Unit, Model 3 Circuit
SD-5D081-011991-10-314B155.12 KB5ESS Switching Equipment - 6 Fan Unit Circuit
SD-5D081-021991-10-312B156.25 KB5ESS Switching Equipment - 6 Fan Unit Circuit
SD-5D082-011992-12-317B1.98 MB5ESS Switching Equipment - Message Interface / Clock Unit, Model 2 Circuit
SD-5D084-011990-06-204M436.02 KB5ESS Switching Equipment - Fuse / Filter Panel 3 Circuit
SD-5D085-011993-09-2413B6.93 MB5ESS Switching Equipment - ECL-Bus Unit (EBUS) Circuit
SD-5D086-011987-09-034M733.41 KB5ESS Switching Equipment - Transmission Rate Converter Unit Circuit
SD-5D086-021996-09-116M1.08 MB5ESS Switching Equipment - Transmission Rate Converter Unit Model 2 Circuit
SD-5D087-011990-06-203M421.35 KB5ESS Switching Equipment - Fuse / Filter Panel 4 Circuit
SD-5D089-011993-03-125B2.50 MB5ESS Switching Equipment - Integrated Services Line Unit Common Shelf Circuit
SD-5D090-011989-06-084B1.11 MB5ESS Switching Equipment - Integrated Services Line Unit - Drawer Circuit
SD-5D091-011987-05-115B1.90 MB5ESS Switching Equipment - Integrated Services Line Unit Circuit
SD-5D092-011998-12-2314B414.60 KB5ESS Switching Equipment - Digital Service Unit, Model 2 Circuit
SD-5D094-011996-05-2026B2.91 MB5ESS Switching Equipment - Module Controller and Time Slot Interchange Unit Circuit
SD-5D099-011994-12-025M213.99 KB5ESS Switching Equipment - Test Access Unit Circuit
SD-5D101-011985-03-011155.26 KBElectronic Switching Systems - No. 3 [Probably should be No. 5] - Master Control Center and Supplementary Trunk Line Work Station Circuit
SD-5D102-011981-07-1314.99 MBElectronic Switching Systems - No. 5 - Line Trunk Frame Circuit
SD-5D114-011994-01-053M232.29 KB5ESS Switching Equipment - Master Control Center / Trunk Line Work Station (6 Ft. 20 In. Depth) Circuit
SD-5D118-011985-08-2610B5.19 MB5ESS Switching Equipment - Switching Module Control Cabinet Circuit
SD-5D118-031990-09-278M2.14 MB5ESS Switching Equipment - Switching Module Control Cabinet Circuit
SD-5D119-011986-12-105D1.48 MB5ESS Switching Equipment - Line Trunk Peripheral Cabinet (6 Ft.) Circuit
SD-5D119-021991-01-296B855.92 KB5ESS Switching Equipment - Line Trunk Peripheral Cabinet (6 Ft.) Circuit
SD-5D123-011995-06-076M3.35 MB5ESS Switching Equipment - Remote Integrated Services Line Unit Cabinet Circuit
SD-5D129-011996-05-1721B4.57 MB5ESS Switching Equipment - Switching Module Processor Unit, Model 2 Circuit
SD-5D130-011994-12-1633B3.72 MB5ESS Switching Equipment - Miscellaneous Cabinet (6 Ft.) Circuit
SD-5D132-011984-10-231431.95 KB5ESS Switching Equipment - 5A RSM Application Schematic
SD-5D133-011996-09-036M933.84 KB5ESS Switching Equipment - Remote Applications Schematic Circuit
SD-5D135-011999-01-0817B525.98 KBElectronic Switching Systems - 5ESS - Operator Services Positions System Application Schematic
SD-5D136-011993-05-078B2.06 MB5ESS Switching Equipment - Message Switch Peripheral Unit Circuit
SD-5D137-011995-11-206B1.52 MBElectronic Switching Systems - 5ESS - Automatic Call Distributor / Management Information System Application Schematic
SD-5D139-011985-02-272D241.81 KB5ESS Switching Equipment - Intercabinet Communications Circuit
SD-5D140-011993-12-0617M5.92 MB5ESS Switching Equipment - Communications Module, Model 2 Circuit
SD-5D142-011986-12-172B240.30 KB5ESS Switching Equipment - Supplementary Trunk Line Work Station (6 Ft. x 20 In. Depth) Circuit
SD-5D144-012001-07-1815M3.50 MB5ESS Switching Equipment - Communication Module, Model 2 Circuit
SD-5D144-021988-07-015A15.10 MB5ESS Switching Equipment - Communication Module, Model 2 Double Dual Fabric Circuit
SD-5D145-011988-07-222M385.39 KBElectronic Switching System - 5ESS - Operator Services Position System - Power Distribution Cabinet
SD-5D146-011987-09-096M7.87 MB5ESS Switching Equipment - Message Switch Cabinet Circuit
SD-5D147-011987-08-035B1.79 MB5ESS Switching Equipment - Time Multiplexed Switch Cabinet Circuit
SD-5D148-011997-09-256B98.24 KB5ESS Switching Equipment - Alarm & Status Unit Model 2 Circuit
SD-5D149-011994-02-183M110.25 KBElectronic Switching Systems - 5ESS Switch - Message Detail Records - Translator Application Processor Application Schematic
SD-5D151-011996-04-1120B9.84 MB5ESS Switching Equipment - Interchanger Unit, Model 2 - Interchange Unit, Model 2 Circuit
SD-5D160-011999-12-1010B5.52 MB5ESS Switching Equipment - Switching Module Control Cabinet Model 2 Circuit
SD-5D162-011991-09-061151.35 KB5ESS Switching Equipment - 6 Fan Exhaust Unit Circuit
SD-5D168-011992-05-183B381.62 KB5ESS Switching Equipment - 6 Fan Bi-Directional Unit Circuit
SD-5D168-021996-12-106M373.75 KB5ESS Switching Equipment - 6 Fan Bi-Directional Unit Circuit
SD-5D171-011999-02-0510B48.52 KBElectronic Switching Systems - 5ESS - 3A Simplified Message System - Interface Translator Application Processor Application Schematic
SD-5D178-011997-10-035M3.87 MBElectronic Switching Systems - 5ESS - Communication Module Processor Unit Circuit
SD-5D180-011988-04-083M3.21 MB5ESS Switching Equipment - Line Unit, Model 3 Circuit
SD-5D190-011993-04-2611.08 MB5ESS Switching Equipment - Modular Fuse Filter Unit Circuit
SD-5D191-011997-07-154M2.79 MB5ESS Switching Equipment - Time Multiplexed Switch Unit Model 3 Circuit
SD-5D192-011991-03-1815.89 MB5ESS Switching Equipment - Integrated Services Line Unit 2 Circuit
SD-5D194-011993-07-141402.84 KB5ESS Switching Equipment - Fuse / Filter Unit Model 5 Circuit
SD-5D195-011995-03-074B6.96 MB5ESS Switching Systems - Switch Module Processor Model 4 (SMPU4) Circuit
SD-5D196-011999-12-296B29.55 MB[5ESS Switching System] - Time Slot Interchange Unit Model 4 (TSIU) Circuit
SD-5D196-021999-12-144B29.16 MB5ESS Switching System - Time Slot Interchange Unit Model 4 (TSIU4-2) Circuit
SD-5D197-011999-01-073B611.39 KB5ESS Switching Systems - Digital Service Unit Model 3 Circuit
SD-5D201-011991-08-1412B1.54 MBElectronic Switching System - 5ESS Switching Equipment - Digital Line Trunk Unit Circuit
SD-5D202-011991-08-194B2.37 MBElectronic Switching Systems - 5ESS Switching Equipment - Digital Carrier Line Unit Circuit
SD-5D202-021991-08-192B2.48 MBElectronic Switching Systems - 5ESS Switching Equipment - Digital Carrier Line Unit Circuit
SD-5D203-011991-08-283B1.11 MBElectronic Switching Systems - 5ESS Switching Equipment - Digital Carrier Line Unit-Supplement Circuit
SD-5D203-021991-08-282B756.98 KBElectronic Switching Systems - 5ESS Switching Equipment - Digital Carrier Line Unit-Supplement Circuit
SD-5D204-011995-07-216A2.73 MB5ESS Switching Equipment - Digital Line Trunk Unit - Remote Integrated Services Line Unit Circuit
SD-5D205-011999-07-086B515.88 KB5ESS Switching Equipment - Digital Line Trunk Unit 2 (DLTU2) Circuit
SD-5D300-011990-04-199AC2.79 MBElectronic Switching Systems - 5ESS - Trunk Unit Circuit
SD-5D301-011996-11-204AC2.09 MB5ESS Switching Equipment - IDCU Integrated Digital Carrier Unit Circuit
SD-5D401-011993-06-118B1.03 MB5ESS Switching Equipment - Facilities Interface Unit Model 2 Circuit
SD-5D401-021993-06-115B876.59 KB5ESS Switching Equipment - Facilities Interface Unit Model 3 Circuit
SD-5D500-011991-08-23145.12 KBElectronic Switching Equipment - 5ESS / International - Power Line Filter Unit Circuit
SD-5D501-011998-02-173M3.25 MB5ESS Switching Equipment - Digital Line Trunk Unit 3 (DLTU3) Circuit
SD-5D502-011992-01-132B85.38 KBElectronic Switching Systems - 5ESS - Switching Communications Adapter Translator Application Processor Application Schematic
SD-5D503-011992-03-303M593.87 KB5ESS Switching Equipment - Enhanced 911 Service Adjunct (ESA) Circuit
SD-5D503-021995-04-1911M827.76 KB5ESS Switching Equipment - Enhanced 911 Service Adjunct (ESA) Circuit (Single and Multiple Switch Applications)
SD-5D505-011993-08-312M358.64 KBElectronic Switching Systems - 5ESS - Advanced Communication Package Version 7 Application Schematic
SD-5D507-011992-02-212M415.18 KB5ESS Switching Equipment - OSPS-AP Cluster Cabinet Circuit
SD-5D508-011997-09-264M3.70 MB5ESS Switching Equipment - Message Switch Control Unit, Model 3 Circuit
SD-5D511-011999-05-073B38.37 KBElectronic Switching Systems - 5ESS - Micro Electronic Directory System Application Processor Application Schematic
SD-5D513-011997-04-186M2.44 MB5ESS Switching Systems - Communications Module Unit Circuit
SD-5D515-011992-07-15169.83 KBInternational 5ESS Switching Equipment - Mesh Earthing Building Circuit
SD-5D517-011993-07-1511.05 MB5ESS Switching Equipment - Remote Line Group Unit Circuit
SD-5D518-011997-11-125B802.92 KB5ESS Switching Systems - Switching Module 2000 - Application Schematic
SD-5D519-011996-08-226M626.57 KB5ESS Switching Equipment - Application Schematic for the 5ESS-2000 Switch (Administrative Workstation and Very Compact Digital Exchange)
SD-5D523-011995-05-2613.50 MB5ESS Switching Equipment - Packet Switch Unit Model 2 Circuit
SD-5D524-011993-07-28149.66 KBElectronic Switching Systems - 5ESS - Ovation Voice Processing System Application Schematic
SD-5D525-011999-03-226M3.01 MB5ESS Switching Equipment - Digital Network Unit - SONET (DNU-S) Circuit
SD-5D527-011993-04-30149.38 KBElectronic Switching Systems - 5ESS - Intelligent Network Application Schematic
SD-5D528-011999-12-083M11.01 MB5ESS Switching Systems - Extended Control / Data Unit (XCDU) Circuit
SD-5D530-011997-03-273M824.76 KB5ESS Switching Equipment - Combined Services Unit Circuit
SD-5D534-011997-11-125B723.30 KB5ESS Switching Systems - Administrative Workstation / Switching Module 2000 Application Schematic
SD-5D536-011999-04-226M8.74 MB5ESS Switching Equipment - Module Controller and Time Slot Interchange Unit Model 3 Circuit
SD-5D539-011998-04-093B43.11 KBElectronic Switching Systems - 5ESS Switch - Message Detail Recording Translator JR (MDR JR) Application Schematic
SD-5D543-011995-09-27183.03 KBElectronic Switching Systems - 5ESS Switch - Public Safety ALI Translator (PSAT) Application Schematic
SD-5D544-011996-06-191210.77 KB5ESS Switching Systems - Remote Units Outdoor (RUO) Cabinet Application Schematic
SD-5D545-011997-12-102A3.86 MB5ESS Switching System - Switch Module Processor Model 5 (SMPU5) Circuit
SD-5D546-011996-01-121270.01 KB5ESS Switching Equipment - Platform Fan Unit Circuit
SD-5D552-011996-04-17123.44 KB5ESS Switching Equipment - Single Point Power Line Filter Unit
SD-5D555-012000-08-093A1.12 MB5ESS Switching Systems - Transmission Rate Converter Unit Model 3 (TRCU3) Circuit
SD-5D556-011997-08-121177.59 KBSynchronous Transport Module Cabinet Circuit
SD-5D564-022000-10-241219.92 KB5ESS Switching Systems - 7R/E Packet Local Solutions Application Schematic
SD-5E001-011976-12-1711D4.58 MBPBX Systems - Trunk Circuit to Central Office - One-Way Outgoing-Dial Selected 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
SD-5E003-011974-02-263D1.61 MBPBX Systems - No. 756A - Inward Restriction Circuit
SD-5E021-011974-02-267D3.94 MBPBX Systems - No. 756A - Station Message Register Pulse and Surcharge Circuit
SD-5E029-011974-02-266D2.55 MBPBX Systems - No. 756A - Make Busy & Busy Display Circuit
SD-5E037-011974-02-263D880.79 KBPBX Systems - Voltage Reduction Detector at Midpoint of Voltage Divider Network
SD-5X201-011992-09-119B1.89 MB5ESS Switching Equipment - Global Digital Service Unit - Export Circuit
SD-5X202-011983-12-231815.49 KB5ESS Export - Periodic Pulse Metering Circuit
SD-5X203-011988-01-206B2.51 MB5ESS Switching Equipment - Analog Trunk Unit - Export Circuit
SD-5X204-011990-12-124B5.04 MBElectronic Switching Systems - 5ESS Switching Equipment - Digital Line Trunk Unit - Export Circuit
SD-5X205-011992-12-083A3.07 MB5ESS Switching Equipment - Line Unit, Model 2 International Circuit
SD-5X213-011990-08-032M1.95 MB5ESS Switching Equipment - Echo canceler Signaling Unit Circuit
SD-5X214-011994-11-1113B858.92 KBElectronic Switching Systems - 5ESS Operator Services Position System (OSPS) International Application Schematic
SD-5X215-021993-05-076B177.59 KB5ESS Switching Equipment - Export Dataset Cabinet Application Schematic Circuit
SD-5X220-011990-11-011385.61 KB5ESS Switching Equipment - International Modem Pooling Cabinet Application Schematic
SD-5X221-011993-03-234B3.50 MB5ESS Switching Equipment - Digital Conference Switching System Cabinet Circuit
SD-5X224-011991-07-113M451.30 KB5ESS Switching Equipment - Digital Test Access Circuit
SD-62404-011941-08-25131.02 MBToll Systems - Telephone Repeater - 2 Wire - Line and Balancing - Key Sheet
SD-62405-011948-10-21201.90 MBCommon Systems - Signaling - Line, Composite, Simplex, and Single Frequency - Key Sheet
SD-62440-011951-04-25294.82 MBToll Systems - Switchboard No. 3 and Tandem Switchboard No. 3 - Key Sheet
SD-63394-031949-07-071941.18 KBToll Systems - "K2" Carrier Telephone - Key Sheet
SD-63394-051949-08-031853.49 KBToll Systems - Broadband Carrier Telephone - Carrier Supply - Key Sheet
SD-63394-061949-09-291878.84 KBToll Systems - Broadband Carrier Telephone - Channel Carrier Terminal Ckts. - Key Sheet
SD-64724-011976-12-2042D1.34 MBToll Systems - Toll Testboard No. 16, 17B or 18B - Toll Test Units No. 1A or 3A - Patching, Monitoring and Testing Jacks - Signal Testing Circuit - Cord Extension Circuit - Carrier 6W VF Channel Patch Bay
SD-64741-011961-12-1818D703.84 KBToll Systems - Toll Switchboard No. 3C, 3CL or 3CF - Toll Testboard No. 17B or 18B - Position Dial Circuit for Repeated Dialing Arranged for Reassociation of a Dial Circuit and for Automatic Start of Ringing
SD-64800-011961-05-16155.16 MBToll Systems - Switchboard No. 3C or 3CL - Key Sheet
SD-65680-0113D881.95 KBPBX No. 507A or 507B - Station Line, Trunk, Connecting, Telephone Ringing, Buzzer and 2-Way Ringdown Tie Trunk Circuits
SD-65718-011967-12-0524D14.01 MBPBX Systems - Tie Trunk Circuit [Rest of description is illegible]
SD-65719-011969-06-1210D2.00 MBPBX 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
SD-65721-011968-02-1320D2.46 MBPBX Systems - No. 701A, 701B, 711A, 711B, or 740E - Selector Connector Circuit - With or Without Terminal Hunting - Arranged to Hunt After Dialing of One or Two Digits - Arranged for Restricted Service
SD-65729-011973-08-2318B882.74 KBPBX Systems - No. 557B - Secretarial Line and Central Office Trunk Circuits
SD-65731-011973-09-1722B1.13 MBPBX Systems - No. 557B for Telephone Answering Service - Position and Station Circuits
SD-65741-011975-03-2053D81.17 MBPBX Systems - No. 756A - Line, Link, and Marker Circuit
SD-65742-011974-02-2632D21.27 MBPBX Systems - No. 756A - Dial Pulse Register Circuit
SD-65744-011974-02-263D738.61 KBPBX Systems - No. 756A - Traffic Register Circuit for Internal Traffic and Trouble Registers
SD-65745-011967-12-286D979.73 KBPBX Systems - No. 756A - Dial Conference Circuit Arranged for a Maximum of 5 Simultaneous Connections
SD-65746-011975-05-2256D95.80 MBPBX Systems - No. 756A - PBX Cabling Diagram
SD-65747-011975-11-2512D1.34 MBPBX Systems - No. 558A System, 756A, 800A, 801A, 812A PBX or Switching System No. 400 - Loudspeaker Paging Trunk Circuit
SD-65750-011975-01-2710D956.34 KBPBX Systems - No. 756A - Junctor Circuit
SD-65752-011975-11-0343D7.23 MBPBX Systems - No. 756A - Two-Way Trunk Circuit to Central Office
SD-65753-011974-02-2621D1.42 MBPBX Systems - No. 756A - Attendant Trunk Circuit
SD-65754-011974-02-267D798.58 KBPBX Systems - No. 756A - Busy Tone Trunk Circuit
SD-65756-011975-05-2210D3.78 MBPBX Systems - No. 756A - Tie Trunk Circuit - Outgoing Manual and Dial Selected With 2 Second Ringing Signal Incoming Ringdown
SD-65757-011975-03-0517D23.99 MBPBX Systems - No. 756A - Cordless Position Circuit
SD-65761-021976-12-135D2.03 MBPBX Systems - No. 701B or 711B - Miscellaneous Alarm Circuit
SD-65773-011966-06-1710D1.08 MBPBX Systems - No. 552A, 552D, 556A, 605A, 701B, 701PK, 711B, 711PK, or 740E - Battery Cut-Off Circuit
SD-65812-011974-12-1715AC5.34 MBPBX Systems - No. 701B - Incoming Trunk Circuit - Arranged to Transfer Station Calls and Route Directory [Illegible]
SD-65827-011972-01-067B1.17 MBPBX Systems - No. 701B - Test Circuit for Testing Register Sender and Link Circuits
SD-65910-021974-02-263D367.41 KBPBX Systems - No. 756A - Current Drain Data
SD-65942-011974-02-268D2.69 MBPBX Systems - No. 756A - Auxiliary Relay Circuit for Direct Station Selection From Stations
SD-66037-011963-07-2923D347.42 KBPBX Systems - No. 701A, 701B, 701PK, 711A, 711B, or 711PK - Test Line Circuit for Testing Connector and Selector Connector Circuits
SD-66073-0118D187.51 KBPBX No. 701A, 701B, 711A, 711B, 740A, 740B, 740C or 740E - Test Set Circuit
SD-66144-0132B298.81 KB[Illegible]
SD-66715-011965-02-2217D1.97 MBPBX Systems - No. 701B, 701PK, 711B or 711PK - Station Line Circuit - Individual or 2 Party Selective Ringing With or Without Restricted Service
SD-66717-011963-07-3112D299.67 KBPBX Systems - No. 701A, 701PK, or 740E - Attendant Trunk Circuit From Selector or Selector Connector Levels
SD-66796-011974-02-2616D3.46 MBPBX Systems - No. 756A - Alarm, Transfer & Test Circuit
SD-66902-011974-02-2610D20.54 MBPBX Systems - No. 756A - Dial Conference Trunk Circuit - Station Controlled
SD-66908-011974-02-268D3.97 MBPBX Systems - No. 756A - Dial Conference Trunk Circuit - Attendant Controlled
SD-66909-011974-03-018D5.20 MBPBX Systems - No. 756A - Station Dial Transfer Controller Circuit
SD-66910-011974-02-266D3.33 MBPBX Systems - No. 756A - Auxiliary Position Circuit for Remote Answering of Trunks and Inward Completion by Any Station
SD-66911-011974-02-268D1.49 MBPBX Systems - No. 756A - Busy Verification Auxiliary Trunk Circuit
SD-66920-011975-05-2322D28.81 MBPBX Systems - No. 756A - Feature Cabling Diagram
SD-66921-011974-05-2012D4.47 MBPBX Systems - No. 756A - Station Dial Transfer Trunk Circuit With Add-On Conference
SD-68400-011955-06-2832.43 MBToll Systems - Toll Switching System No. 4A and Associated Toll Switchboard No. 5 and Toll Test Board No. 17C - Key Sheet
SD-69000-011959-04-2227D6.31 MBStation Systems - No. 100 Key Equipment - Multiple Line - Line Auxiliary Signal Circuit - For Use With Central Office or PBX With or Without Arangement to Retire Line Signal When Line is Released at Central Office PBX Arranged for Intercommunicating Service
SD-69001-011959-05-0616D5.19 MBStation Systems - No. 100 Key Equipment - Multiple Line - Tie Line and Auxiliary Signal Circuit
SD-69002-011959-04-1716D3.43 MBStation Systems - No. 100 Key Equipment - Telephone, Dial, and Tripping Circuit
SD-69021-011936-03-197D290.60 KBStation Systems - No. 15A Key Equipment Arranged for Remote Switching
SD-69037-011936-03-207D428.26 KBStation Systems - No. 23A Key Equipment Arranged for Remote Switching
SD-69091-0116D2.59 MBKey Telephone System No. 1A - Line and Signaling Circuit
SD-69091-011969-10-2419D17.24 MBStation Systems - Key Telephone System No. 1A - Line and Signaling Circuit
SD-69096-017D210.89 KBKey Telephone System No. 1A - Key and Telephone Circuit Arranged for Pick Up and Holding on One Central Office or P.B.X. Line and Pick Up on 3 Private or Intercommunicating Lines With Common Signaling Key
SD-69104-015D512.47 KBKey Telephone System No. 1A - Key and Telephone Circuit For Combined Turn and Push Button Key Telephone Sets
SD-69105-016A515.09 KBKey Telephone System No. 1A - Private Line Circuit
SD-69105-011959-02-207D1.78 MBStation Systems - Key Telephone System No. 1A - Private Line Circuit For an Off-Premise Extension Station Arranged to Provide for Central Office Service
SD-69110-018DI2.46 MBStation Systems [Key Telephone System No. 1A] - Unattended Station Circuit
SD-69128-016D976.37 KBKey Telephone System No. 1A - Key and Telephone Circuit Arranged for Pick Up, Holding, Cut-Off and Signaling
SD-69129-017D1.33 MBKey Telephone System No. 1A - Key and Telephone Circuit Arranged for Pick Up, Cut-Off and Signaling
SD-69131-011964-08-035D1.19 MBStation Systems - Key Equipment No. 103A
SD-69132-014D591.14 KBKey Telephone System No. 1A - Key and Telephone Circuit With Separately Mounted Keys Arranged for Pick Up, Holding, Cut-Off and Signaling
SD-69133-014D460.96 KBKey Telephone System No. 1A - Key and Telephone Circuit With Separately Mounted Keys Arranged for Pick Up, Cut-Off and Signaling
SD-69136-0113B2.84 MBKey Telephone System No. 1A - Line and Signaling Circuit
SD-69140-013D132.03 KBKey Telephone System No. 1A - Automatic Exclusion Circuit
SD-69155-011185.82 KBStation Systems - Key Telephone System No. 1A - Listening-In Circuits
SD-69160-011964-08-2820D5.07 MBStation Systems - Equipment Units
SD-69165-012D603.57 KBKey Telephone System No. 1A - Station Circuits
SD-69186-011225.21 KBKey Telephone System No. 1A - Lamp, Key and Telephone Circuit With Lamps in Telephone Set Arranged for Pick Up and Holding on One Central Office or PBX Line and Pick Up on 3 Private or Intercommunicating Lines With Common Signaling Keys
SD-69187-011877.23 KBKey Telephone System No. 1A - Lamp, Key and Telephone Circuit With Lamps in Telephone Set Arranged for Pick-Up, Holding, Cut-Off and Signaling
SD-69188-011814.91 KBKey Telephone System No. 1A - Lamp, Key and Telephone Circuit With Lamps in Telephone Set Arranged for Pick-Up, Cut-Off and Signaling
SD-69196-012D818.25 KBKey Telephone System No. 1A - Attendant's Telephone and Key Circuit Using 101A Key Equipment Key Unit
SD-69204-011959-04-074D4.05 MBStation Systems - Key Telephone System No. 2B - For 2-Station Intercommunicating Service Arranged for a Loudspeaker and Distant Talking Transmitter at One Station
SD-69206-0111020.25 KBKey Telephone System No. 1A or 1A1 - Key and Telephone Circuit Arranged for Pick-Up, Holding, Lamps, Exclusion, Cut-off and Signaling
SD-69207-011338.09 KBKey Telephone System No. 1A or 1A1 - Key and Telephone Circuit With Separately Mounted Keys Arranged for Pick-up, Holding Cut-off and Signaling
SD-69211-011971-02-236D1.38 MBStation Systems - Civil Air Defense Warning Systems - Station Signal Indicator and Control Station Dial Circuit
SD-69225-011959-03-092D352.65 KBStation Systems - Station Circuits for Public Emergency Reporting
SD-69226-011959-03-101569.08 KBStation Systems - F-50682 Telephone Set - Private Line Station Circuit - 2-Wire or 4-Wire - Arranged for Loop or Simplex Ringing
SD-69255-011959-07-172D7.40 MBStation Systems - Speakerphone System No. 1A - Telephone and Speakerphone Circuit
SD-69286-011967-06-017D2.01 MBStation Systems - Key Telephone System No. 6A - Intercommunicating Line Circuit - Two-Wire, Selective Signaling
SD-69299-012D1.43 MBKey Telephone System No. 1A or 1A1 - Intercommunicating Line Circuit
SD-69360-011960-04-202D334.75 KBStation Systems - Order Turret No. 4 - Attendant Key and Telephone Circuit
SD-69364-011965-03-043A5.24 MBStation Systems - Control Station Circuit for Use With Central Office Group Alerting System
SD-69410-011962-10-252D1.75 MBStation 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
SD-69411-011961-05-154D573.09 KBStation Systems - Key Telephone System No. 6A - Touch-Tone Adapter
SD-69513-011973-01-1115B793.78 KBStation Systems - Key Telephone System No. 1A2 - CO or PBX Line Circuit
SD-69566-011967-03-2012.39 MBStation System - 4 Wire Private Line Terminating and Station Circuit
SD-69604-011975-11-261193.96 KBStation Systems - Key Telephone System No. 1A2 - Off Premises Line Circuit
SD-69608-011974-05-214A1C1.61 MBStation Systems - Key Telephone System No. 1A2 - Dial Intercommunicating and Miscellaneous Panels
SD-69610-011978-05-1511D8.71 MBStation Systems - Switching System No. 301A Arranged for Multiple Access
SD-69617-011970-01-051331.94 KBStation Systems - 1A2 Key Telephone System - CO or PBX Line Circuit - Integrated Circuit Type
SD-69624-011978-09-142D831.85 KBStation Systems - Key and Telephone Circuit for Rotary and Touch-Tone Dial - 10-Button Telephone Sets - 830- and 2830- Type Telephone Sets
SD-69625-011970-06-251870.31 KBStation Systems - Key and Telephone Circuit for Rotary and Touch-Tone Dial - 20-Button Telephone Sets - 831 A1M and 2831 A1M Type Telephone Sets
SD-69626-011970-01-051133.81 KBStation Systems - Interphone Radio Transfer Arrangement for Use with FAA Small Key Systems or 112 Key Equipment
SD-69635-011971-08-311778.15 KBStation Systems - Key Telephone System No. 1A2 - 584D Panel Connections
SD-69637-011974-08-1911.91 MBStation 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
SD-69639-011974-08-1911.57 MBStation 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
SD-69641-011972-11-1711.96 MBStation Systems - Key Telephone Systems No. 1A, 1A1, 1A2, or 6A - 682AA, 683AA, 2682AA, 2683AA Telephone Set Circuit - 18- and 30-Button Capacity for Use With 2- and 4-Wire Lines Arranged for Dial Pulse or Touch-Tone Calling and "A" Lead Control
SD-69651-011977-01-173B191.77 KBStation Systems - Key Telephone System No. 1A2 - CO or PBX Line Circuit - 400G KTU
SD-69651-011978-06-095D190.91 KBStation Systems - Key Telephone System No. 1A2 - CO or PBX Line Circuit - 400G KTU
SD-69900-011973-02-263D789.78 KBStation Systems - 50A Conference Set (73A Control Unit) Circuit
SD-69900-021974-09-042A793.54 KBStation Systems - 50A1 Conference Set (73B Control Unit) Circuit
SD-69900-021979-06-044B1881.41 KBStation Systems - 50A1 Conference Set (73B Control Unit) Circuit
SD-69906-011977-07-134D553.03 KBStation Systems - Key Telephone System No. 1A2 - Touch-Tone Adapter Circuit - Type D4
SD-73060-011976-09-2210B11.12 MBData Systems - Central Office and Station Data Set 108D Type
SD-73094-011977-01-174B4.51 MBData Systems Station - Data Test Set No. 911NA
SD-80700-011961-08-171310.56 MBPower Systems - Key Sheet - Standard Ratings
SD-80885-0132B5.60 MBDistributing & Control Equipment - SXS Systems Nos. 1, 350A, 355A & 35E97, and 701A & 711A PBX and 701B and 711B PBX - 806D Ringing Power Plants
SD-80886-011973-07-2524B3.04 MBPower Systems - 800 Type Plants - Signaling Circuit - Tone Supply - Static Frequency Generators & Drum Interrupters - 806D Ringing Power Plants - J86596
SD-81326-021975-12-178D1.27 MBPower Systems - Power Supply Circuit for 756A PBX With Battery Reserve - J86464
SD-81328-011975-12-176D659.28 KBPower Systems - Signaling Circuit - Transistor Low Tone Supply - 756A PBX - J86464G
SD-81329-011975-12-168D753.48 KBPower Systems - Ringing Circuit - Transistor 20~ Supply - 756A PBX & 800A PBX - J-86464H
SD-81540-011968-09-2318B632.92 KBPower Systems - Regulated Rectifier - Semi-Conductor Type - 48 Volts, 11 Amperes DC - 115/230 Volts, 60 Cycle AC - J87211A
SD-81577-011974-01-3113D621.24 KBPower Systems - Power Supply Circuit for AC, DC & Ringing Supply - J86812A & B
SD-81581-011976-01-0822D1.95 MBPower Systems - Slide No. 1 Power Supply for 757A PBX - J86808B
SD-81600-011969-11-138D598.85 KBPower Systems - Power Supply Circuit - AC, DC & Ringing Supply for 756A Batteryless PBX - J86464L
SD-81837-011973-07-2510B3.10 MBPower Systems - Remote Test Voltage Supply Circuit - J87300
SD-81920-011976-01-083D1012.01 KBPower Systems - Power Supply Circuit - -96 Volt DC Applique for 756A PBX - J86464P
SD-81999-011978-07-038D1.15 MBPower Systems - Rectifier Circuit - Ferroresonant Type - 48 VDC 100 Amp - Automatic Regulation - KS-20493
SD-82156-011978-03-229B5.78 MBPower Systems - Ringing, Tone and Signaling Circuits - General Use Circuit Packs
SD-82161-021978-03-222B1.84 MBPower Systems - DC to DC Converter - -48 Volt and +24 Volt Inputs - +3.030 Volt, 5 Ampere Output - J87389F2
SD-82178-011976-05-192A697.78 KBPower Systems - Inverter Circuit - 500 VA, 120 V, 60 Hz Single Phase - 42.75 - 52.5 VDC Input - KS-20816, L2 [Lorain SD-5174-310]
SD-82249-011978-06-222B1.62 MBPower Systems - DC to DC Converter - -48 Volt and +24 Volt Inputs - +3.030 Volt, 8 Ampere Output - J87389P
SD-82250-011978-06-232B3.82 MBPower Systems - DC to DC Converter - -48 Volt and +24 Volt Inputs - -1 to -13 Volt, 2 Ampere Output - J87389R-1
SD-82255-011980-09-175B15.90 MBPower Systems - Ringing, Tone & Signaling Circuits - 881A Ringing, Tone & Cadence System for No. 3 ESS Offices - Inputs: -48V DC, +48V DC - Outputs: (A): 105 V (Taps at 86V & 97V) @ 20 Hz; (B): 105V (Taps at 86V & 97V) @ 20 Hz; (C): 105V (Taps at 86V) @ 20 Hz - 43.0 VA Max. Plant Ringing Capacity - 0.1 VA Precise Tone Capacity (Each Tone) - J87824
SD-82258-011976-04-272AR921.24 KBPower Systems - Inverter Circuit - 20 Hz DC to AC Inverter - 86V, 0.5 Ampere - J87415
SD-82303-011980-07-182B4.94 MBPower Systems - Control Circuit for the Charge Discharge Circuit - 151A Power Plant
SD-82304-011980-08-063B4.26 MBPower Systems - Charge and Discharge Circuit - 24 Cells - 151A Power Plant
SD-82327-011978-06-122B1.44 MBPower Systems - DC to DC Converter - -48 Volt and +24 Volt Inputs - +5.000 Volt, 6 Ampere Outpit - J87421A-1
SD-82340-011975-07-2112.23 MBPower Systems - DC to DC Converter - 188A/189A Power Unit - -48V Input - +24V, 8 Amp Output
SD-82341-011975-07-2111.86 MBPower Systems - DC to DC Converter - 184A Power Unit - -48V Input - +48V, 1.8 Amp Output
SD-82342-011975-07-2111.88 MBPower Systems - DC to DC Converter - 184B Power Unit - -48V Input - +130V, 0.25 Amp and -130V, 0.25 Amp Output
SD-82383-011978-10-043B2.19 MBPower Systems - DC to DC Converter - -48 Volts, +24 Volts, +5 Volts Inputs - +12.00 Volts, 2.0 Amperes Output, -5.00 Volts, 0.05 Ampere Output - J87422B
SD-82401-012B2.84 MBPower Systems - Rectifier Circuit - Ferroresonant Type - 48 VDC 100 Amp - Automatic Regulation - KS-20493 [ITT-North Electric SD-439 2527]
SD-82447-011982-02-252B313.68 KBPower Systems - Charge and Discharge Circuit - 48 Volts, 600 Amps - 100 Type Plants - 151C Power Plant
SD-82588-011990-04-1613M1.06 MBPower Systems - "LINEAGE" 2000 Controller for 24 Volt or 48 Volt Power Plant - J85501A
SD-82603-011997-12-1617M1.21 MBPower Systems - "LINEAGE" 2000 Charge and Discharge Ckt - 24 or 48 Volts 6400 Amperes Maximum - J85500A-1, A-2
SD-82604-011996-03-1110AC650.33 KBPower Systems - "LINEAGE" 2000 Rectifier Circuit - Input: 208 or 240 Volts, 60 Hz - Output: 24 Volts or 48 Volts, 25 or 50 Amperes - J85502A & B
SD-82605-011995-11-1013M500.25 KBPower 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
SD-82619-011993-08-048B670.77 KBPower Systems - DC Power Distributing Frame - J86334D
SD-82646-011987-05-192B489.64 KB"LINEAGE" XCS Controller - J85501B
SD-82649-011994-03-267B882.60 KBPower Systems - LINEAGE 2000 Charge and Discharge Ckt - 24 or 48 Volts, 600 Amperes Maximum - J-85500C, H589-411
SD-82659-011994-08-259AC419.51 KBPower Systems - "LINEAGE" 2000 Rectifier Circuit - Input: 208 or 240 Volts, 60 Hz - Output: 24 Volts or 48 Volts, 125 Amperes - J85502C
SD-83102-011991-04-049AC416.77 KBPower Systems - Rectifier Circuit - 208/240 or 480 Volt, 60 Hz Input - 48 Volt, 400 Ampere Output - J85503C
SD-83104-011991-02-127B853.20 KBPower Systems - "LINEAGE" 2000 Charge and Discharge Circuit - 24 or 48 Volts, 400 Amperes Maximum
SD-83191-011994-12-024B444.99 KBPower Systems - DC Power Distributing Frame - J86334E-1
SD-8G000-012001-03-292M7.87 MB5ESS Switching Equipment - Access Interface Unit (AIU)
SD-8G001-012001-03-19113.55 MB5ESS Switching Equipment - Access Interface Platform Circuit (AIP)
SD-90250-011958-06-2328863.61 KBCommon Systems - Master Key Sheet
SD-90250-011960-10-0330I4.05 MBCommon Systems - Master Key Sheet
SD-90625-011952-03-178467.16 KBCommon Systems - Service Observing Desks and Service Observing Sets - Key Sheet
SD-95102-021980-09-1710B2.63 MBCommon Systems - Transmission Measuring IW Noise Amplifier Rectifier Ckt. For Measuring Noise on Transmission Circuits or a Message Weighting Basis
SD-95162-021973-08-079B691.26 KBCommon Systems - Transmission Measuring - 1000 Hz Outlets, Receiving Jacks and Controls
SD-95259-011979-01-022D347.95 KBCommon Systems - KS-16617 Amplifier Circuit - Special Purpose Amplifier for Use in MDF Loudspeaker Telephone System
SD-95277-011972-08-0714B2.48 MBCommon Systems - Transmission Measuring - Milliwatt Distributing Ckt Using 71 Type Milliwatt Reference Generator (71A, 71B & 71C MW Ref Gen) (71D & 71E Network Panels)
SD-95283-021981-10-231587.42 KBCommon Systems - Announcement Circuit Employing KS-16765 List 12 Announcement Set
SD-95956-019BI943.64 KBCommon Systems - Dual Channel Receiver Circuit
SD-95973-011973-04-045D556.86 KBCommon Systems - Subscriber Loop Bridge Lifting Circuit
SD-96002-011940-12-033D193.69 KBCommon Systems - Local Test Cabinet No. 2 - Test Set Circuit - Test Battery Supply Jack Circuit for Testing Subscriber Lines and Trunks
SD-96172-011958-11-136325.56 KBCommon Systems - Operating Room Desk No. 19 - Key Sheet
SD-96181-011972-06-0728D1.82 MBCommon Systems - Local Test Cabinet No. 3 - Telephone and Test Circuit for Testing Subscriber Lines
SD-96555-011977-12-1217D953.16 KBCommon 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
SD-96608-011977-03-2114A24.05 MBCommon Systems - Transmission Measuring - ATMS - 54 Type - Manually Controlled Interrogator System Schematic
SD-96619-011977-02-222AR35.47 MBCommon Systems - Voice Frequency Transmission - Switched Maintenance Access System No. 3A, 3B, 3C - Type 2BX Nonmetallic Manual Access Circuit
SD-97102-011978-03-0816D242.89 KBCommon Systems - 15 Amp Decentralized Filter Circuit for Talking or Filament Battery Supply Arranged for Mounting from the Superstructure
SD-97272-011977-05-1111B4.80 MBCommon Systems - N1 and ON Carrier Telephone - Application Schematic for Powering N1, N1A, N1-H, N2, ON1 and ON2 Repeaters
SD-97558-011980-05-283A5.97 MBCommon Systems - Far-End Test Trunk for Incoming Remote Testing From LTD
SD-97565-011980-02-113B5.67 MBCommon Systems - Talk Trunk and Line Circuit Applique - No. 16 LTD, LSV and Key Telephone Systems
SD-97722-021978-08-023A3.49 MBCommon Systems - Range Extender With Gain (Reg) - Bay Wiring and Application Schematic
SD-97736-011979-02-138B19.78 MBCommon Systems - KS-21447 Mini-Recorder Circuit for Recording and Reproducing Digital Data
SD-97753-011978-02-16110.82 MBCommon Systems - 13A Announcement System - Circuit for Recording and Reproducing Dial Facilities Management Announcements
SD-97753-011985-03-218D2.61 MBCommon Systems - 13A Announcement System - Circuit for Recording and Reproducing Dial Facilities Management Announcements
SD-97798-011994-06-309B414.13 KBCommon Systems - 14A Announcement System Circuit
SD-97816-011993-11-19166.97 KBCommon Systems - 16A Announcement System Circuit
SD-98091-011976-03-2412D688.88 KBCommon Systems - Signaling - Load Transfer Circuit for Use With a Pair of 2000, 2400 or 2600-Cycle Supply Circuits
SD-98148-011972-04-1512D5.92 MBCommon Systems - "TOUCH-TONE" Calling - Receiving Circuit - Type A3
SD-99303-011978-05-0318D2.45 MBCommon Systems - 400A Tone Generator Circuit
SD-99303-011980-05-1519D1.29 MBCommon Systems - 400A Tone Generator Circuit
SD-99304-011978-08-0812D2.24 MBCommon Systems - 5A Timer Circuit
SD-99308-011976-08-2015AR6.15 MBCommon Systems - Far End Test Trunk or Line Circuit for Remote Testing From Local Test Desk
SD-99311-011977-02-1820B20.24 MBCommon Systems - Remote Testing Circuit - Far End - For Step-By-Step, Crossbar No. 1, Crossbar No. 5, Panel or ESS Offices
SD-99356-011980-02-0414D12.93 MBStation Systems - Recorder Coupler Circuit - KS-19522 Recorder Couplers
SD-99392-011980-05-194A43.72 MBCommon Systems - Transmission Measuring Mini-ROTL Circuit for Use With Stored Program Control Offices
SD-99560-011976-11-2713A16.35 MBCommon Systems - Switched Maintenance Access System No. 4A - Controller and Connector Circuit