| Section
| Date
| Issue
| Size
| Title
|
| 312-000-000 | 1978-12-01 | 57 | 209.58 KB | Numerical Index - Division 312 - Private Line Data Systems and Services |
| 312-000-000 | 1982-06-01 | 62 | 220.56 KB | Numerical Index - Division 312 - Private Line Data Systems and Services |
| 312-000-000PN A | 1983-05-01 | N | 226.83 KB | Pacific Northwest Bell - Numerical Index - Division 312 - Private Line Data Systems and Services |
| 312-001-011 | 1972-12-01 | 4 | 1.56 MB | Equipment Test List - Toll-Type Equipment - Private Line Telegraph Systems and Services |
| 312-002-100 | 1958-01-01 | 1 | 2.12 MB | Theory and Characteristics of Electronic Telegraph Loops |
| 312-003-100 | 1952-06-01 | 1 | 2.73 MB | Operation of the Teletypewriter, Perforator and Transmitter-Distributor |
| 312-004-100 | 1952-06-01 | 1 | 428.69 KB | Description and Training Material - Operation of the Teletypewriter - 28-Type Teletypewriter |
| 312-005-100 | 1935-04-01 | 1 | 1.51 MB | Theory of Signal Reception in Teletypewriters |
| 312-006-100 | 1951-02-01 | 1 | 625.18 KB | Theory of Characteristic Distortion and Its Reduction by Equalization |
| 312-007-100 | 1956-09-01 | 1 | 1.47 MB | Distortion as Related to Teletypewriter Operation |
| 312-008-100PN A | 1966-06-01 | A | 565.44 KB | Teletypewriter Loops - Wave Shaping - Loop Length Limits - Noise Influence |
| 312-008-500 | 1969-11-01 | 1 | 109.95 KB | Telegraph Loops - Testing DC Loops Equipped with Continuity Indicators |
| 312-009-100 | 1958-08-01 | 2 | 974.96 KB | Teletypewriter Stations - Orientation and Distortion Tests |
| 312-010-100 | 1934-07-01 | 1 | 847.00 KB | Daily Lineup Procedures - Telegraph Circuits |
| 312-011-101 | 1970-07-01 | 1 | 199.65 KB | Telegraphic Type Services - Standard Interface Specifications - Series 1000 Channels |
| 312-011-101 A | 1973-05-01 | 1 | 754.54 KB | Telegraphic Type Services - Standard Interface Specifications - Series 1000 Channels |
| 312-011-101 X1 | 1970-07-01 | 1 | 300.67 KB | 30-Baud Private Line Channels - Interface Specification |
| 312-011-101 X2 | 1970-07-01 | 1 | 441.02 KB | 45-, 55-, and 75-Baud Private Line Channels - Interface Specification |
| 312-011-101 X3 | 1970-07-01 | 1 | 1.06 MB | 150-Baud Private Line Channels - Interface Specifications |
| 312-011-500 | 1970-06-01 | 1 | 3.12 MB | Teletypewriter - General Electric Records Communication Network - Testroom Responsibilities and Procedures |
| 312-011-501 | 1970-07-01 | 1 | 1.54 MB | Office Respnsibilities and Operating Procedures for Circuits Associated with CPE - Teletypewriter Switching Systems |
| 312-011-502 | 1970-07-01 | 1 | 81.94 KB | Series 1000, Type 1001 Channels - Signaling, Supervisory Control and Telemetering Circuits, 0 to 15 Hz |
| 312-011-502 X1 | 1970-07-01 | 1 | 215.76 KB | Series 1000, Type 1001 Channels - Furnished to A. C. Nielsen Co. |
| 312-011-502 X2 | 1970-07-01 | 1 | 1.46 MB | Series 1000, Type 1001 Channels - SC2 Supervisory Control System |
| 312-011-502 X3 | 1970-07-01 | 1 | 1.51 MB | Series 1000, Type 1001 Channels - Traffic Network Management Telemetering Circuits |
| 312-012-100 | 1969-11-01 | 1 | 488.39 KB | Alternate Full Period Teletypewriter - Private Line Services - Description and Operation |
| 312-015-100 | 1971-04-01 | 1 | 350.51 KB | Loss-of-Facility Alarm Circuit J70165E - Description |
| 312-100-000 | 1963-09-01 | 1 | 7.76 MB | Engineering and Operating Considerations Involved in Furnishing Circuits to the Western Union Telegraph Copany Under Special Contract |
| 312-100-000LL A | 1964-02-01 | A | 333.38 KB | Engineering and Operating Considerations Involved in Furnishing Circuits to the Western Union Telegraph Copany Under Special Contract |
| 312-105-905LL | 1965-07-01 | A | 1.71 MB | General Electric Company Data Communications Processor - Description |
| 312-110-900LL | 1965-04-06 | A2 | 3.71 MB | General Electric Records Communication Network (RECOMM) |
| 312-200-101 | 1950-06-01 | 3 | 5.48 MB | Metallic Telegraph System - Four-Wire Operation |
| 312-200-102 | 1950-09-01 | 1 | 406.18 KB | Metallic Telegraph System - Equalization - Description |
| 312-200-500 | 1950-06-01 | 1 | 847.20 KB | Metallic Telegraph System - Equalization Test and Adjustments |
| 312-200-501 | 1955-04-01 | 1 | 672.98 KB | Grounded Telegraph System - Equalization |
| 312-210-100 | 1951-11-01 | 1 | 1.21 MB | 144A1 Coupling Unit |
| 312-210-101 | 1951-11-01 | 1 | 368.89 KB | 144B1 Coupling Unit |
| 312-210-102 | 1978-10-01 | 2 | 1.16 MB | 144C1 Coupling Unit - Description and Operation |
| 312-210-500 | 1978-10-01 | 3 | 1.19 MB | 144A1, 144B1, 144B2, and 144C1 Coupling Units - Tests and Adjustments |
| 312-211-100 | 1952-01-01 | 1 | 124.22 KB | 344-Type Plugs for Telegraph Relay Connecting Blocks |
| 312-215-100 | 1973-09-01 | 3 | 617.61 KB | Negative 330-Volt Supply Circuit - Description and Operation |
| 312-215-500 | 1973-09-01 | 3 | 648.36 KB | Negative 330-Volt Supply Circuit - Test Procedures |
| 312-301-100 | 1947-10-01 | 2 | 1.25 MB | 10E1 Telegraph Single Line Repeater |
| 312-301-500 | 1939-12-01 | 1 | 89.13 KB | 10E1 Telegraph Single Line Repeater - Tests and Adjustments |
| 312-302-100 | 1959-07-01 | 2 | 685.42 KB | 13C1 One-Way Split Loop Telegraph Repeater |
| 312-302-101 | 1959-07-01 | 2 | 204.61 KB | 13F1 One-Way Polar Telegraph Repeater |
| 312-302-102 | 1965-09-01 | 1 | 683.20 KB | 13G1 One-Way Repeater (J70107) |
| 312-302-103 | 1956-07-01 | 1 | 466.38 KB | 13H1 Loop Repeater for Direct Leg Operation in Nos. 2 and 9B Service Board Offices |
| 312-303-100 | 1939-02-01 | 1 | 3.72 MB | 16B1 Telegraph Repeater |
| 312-303-500 | 1939-02-01 | 1 | 804.07 KB | 16B1 Telegraph Repeater - Tests and Adjustments |
| 312-304-100 | 1951-09-01 | 1 | 3.42 MB | 16C1 Telegraph Repeater and Balanced Loop Applique |
| 312-304-100 A | 1956-10-01 | 1 | 408.59 KB | 16C1 Telegraph Repeater and Balanced Loop Applique |
| 312-304-500 | 1951-09-01 | 1 | 1.47 MB | 16C1 Telegraph Repeater and Balanced Loop Applique - Tests and Adjustment |
| 312-304-500 A | 1956-05-01 | 1 | 69.11 KB | 16C1 Telegraph Repeater and Balanced Loop Applique - Tests and Adjustment |
| 312-306-100 | 1951-11-01 | 1 | 572.17 KB | 90C1 Loop Repeater |
| 312-405-100 | 1978-12-01 | 3 | 1.23 MB | 96A1 Electronic Loop Repeater |
| 312-405-300 | 1978-06-01 | 3 | 116.15 KB | 96A1 Electronic Loop Repeater - Summary of Tests |
| 312-405-500 | 1978-09-01 | 3 | 1.04 MB | 96A1 Electronic Loop Repeater - Tests and Adjustments |
| 312-507-500 | 1968-04-01 | 5 | 1.12 MB | 143A1 and 143A2 Regenerative Telegraph Repeaters - Tests and Adjustments |
| 312-509-100 | 1966-09-01 | 1 | 1.35 MB | 145A1 Regenerative Repeater (Central Office Data Systems) - Description |
| 312-700-100 | 1974-09-01 | 5 | 11.68 MB | 43A1 Voice-Frequency Carrier Telegraph (VFCT) System (J70112-) - Description and Operation |
| 312-700-100 A | 1975-03-01 | 1 | 518.11 KB | 43A1 Voice-Frequency Carrier Telegraph (VFCT) System (J70112-) - Description and Operation |
| 312-700-100 A | 1980-12-01 | 2 | 45.55 KB | 43A1 Voice-Frequency Carrier Telegraph (VFCT) System (J70112-) - Description and Operation |
| 312-700-200 | 1974-09-01 | 1 | 1.50 MB | 43A1 Voice-Frequency Carrier Telegraph (VFCT) System (J70112-) - Installation and Connection |
| 312-700-200 A | 1975-03-01 | 1 | 463.25 KB | 43A1 Voice-Frequency Carrier Telegraph (VFCT) System (J70112-) - Installation and Connection |
| 312-700-200 A | 1980-12-01 | 2 | 35.19 KB | 43A1 Voice-Frequency Carrier Telegraph (VFCT) System (J70112-) - Installation and Connection |
| 312-700-300 | 1975-07-01 | 2 | 3.36 MB | 43A1 Voice-Frequency Carrier Telegraph (VFCT) System (J70112-) - Maintenance Procedures |
| 312-700-500 | 1975-07-01 | 1 | 4.33 MB | 43A1 Voice-Frequency Carrier Telegraph (VFCT) System (J70112-) - Test Procedures |
| 312-700-500SW A | 1975-11-01 | A | 73.47 KB | 43A1 Carrier Telegraph Terminal |
| 312-709-500 | 1968-12-01 | 3 | 249.59 KB | Voice-Frequency Carrier Telegraph - A1 Level-Variation Detector - Tests and Adjustments |
| 312-710-200 A | 1971-10-01 | 1 | 2.73 MB | 43B1 Voice Frequency Carrier Data System - Out-of-Service and Installation Tests |
| 312-710-500 | 1972-08-01 | 1 | 564.14 KB | 43B1 Voice Frequency Carrier Data System - Trouble Locating Tests |
| 312-720-100 | 1982-06-01 | 1 | 1.21 MB | MUX/VERTER - Description, Installation, Testing, Maintenance |
| 312-800-100 | 1975-04-01 | 2 | 2.08 MB | Data Set 108B - Description |
| 312-800-300 | 1975-04-01 | 2 | 3.95 MB | Data Set 108B - Maintenance |
| 312-800-500 | 1975-04-01 | 2 | 38.45 KB | Data Set 108B - Test Procedures |
| 312-801-100 | 1967-06-01 | 1 | 1.62 MB | Data Auxiliary Set 811C - Description |
| 312-802-100 | 1967-12-01 | 1 | 1.73 MB | Data Set 109B Type - Description |
| 312-802-300 | 1971-02-01 | 2 | 2.66 MB | Data Set 109B-Type - Maintenance Procedures |
| 312-802-500 | 1970-05-01 | 1 | 30.08 KB | Data Set 109B-Type - Test procedures |
| 312-804-100 | 1968-04-01 | 1 | 2.33 MB | Data Set 110C - Description |
| 312-804-300 | 1968-04-01 | 1 | 1.63 MB | Data Set 110C - Maintenance |
| 312-804-500 | 1968-04-01 | 1 | 26.90 KB | Data Set 110C - Test Procedures |
| 312-805-100 | 1972-12-01 | 2 | 2.67 MB | Data Sets 108D- and 108E-Type Used With Type-3 Low-Voltage Hub Arrangements - Description |
| 312-807-100 | 1971-08-01 | 1 | 2.86 MB | Type-3 Low-Voltage Hub - Description and Operation |
| 312-807-200 | 1974-07-01 | 2 | 14.45 MB | Type-3 Low-Voltage Hub - Installation and Connections |
| 312-807-500 | 1974-08-01 | 2 | 3.65 MB | Type-3 Low-Voltage Hub - Test Procedures |
| 312-808-100 | 1971-08-01 | 1 | 2.03 MB | Data Set 109G-L1 - Description |
| 312-809-150 | 1972-10-01 | 1 | 768.87 KB | 405-Type Data System - Supplementary Information |
| 312-809-180 | 1971-07-01 | 1 | 189.61 KB | Data Set 405 Type - Summarizing Specification - Data Systems |
| 312-809-200 | 1972-09-01 | 1 | 229.66 KB | 405-Type Data System - Installation and Connections |
| 312-809-501 | 1973-06-01 | 1 | 367.96 KB | 405-Type Data System and Interface Circuit for Message Register Reporting - Test Procedure |
| 312-810-100 | 1972-06-01 | 1 | 1.60 MB | Data Auxiliary Set 811K-L1 - Identification |
| 312-811-100 A | 1980-12-01 | 1 | 51.44 KB | Data Set 201D-Type - Description |
| 312-812-100 | 1975-07-01 | 1 | 754.86 KB | Low Speed Signaling System Using Data Set 115A - Description |
| 312-812-180 | 1975-06-01 | 2 | 219.56 KB | Low-Speed Signaling System Using Data Set 115A - Summarizing Specification - Data Systems |
| 312-812-200 | 1975-07-01 | 1 | 476.03 KB | Low Speed Signaling System Using Data Set 115A - Installation and Connections |
| 312-812-300 | 1975-07-01 | 1 | 188.67 KB | Low Speed Signaling System Using Data Set 115A - Maintenance |
| 312-812-500 | 1975-07-01 | 1 | 172.43 KB | Low Speed Signaling System Using Data Set 115A - Test Procedures |