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Bell System Practices - Key Telephone Systems (C-series BSPs)
This is a binder of Bell System Practices covering key telephone systems. All BSPs are the old style numbering where each section number starts with the letter C. Systems covered include 6A, 1A, and 1A1 key telephone systems and 1A and 1B code calling systems. Contains many sections covering lots of different key telephone units (KTUs) as well. Binder contains about 650 pages.
List of sections in this binder:C71.000, Alphabetical Index [C71 Group - Major Station Systems], Issue 2, 1958-07-01C71.001, Checking List - C71 Group - Major Station Systems, Issue 8, 1963-01-01C71.011, 6A Key Telephone System - Identification, Issue 3, 1959-11-01C71.011, 6A Key Telephone System - Identification, Issue 4, 1961-09-01C71.012, 6A Key Telephone System - Selector Only - Connections, Issue 3, 1961-02-01C71.013, 6A Key Telephone System - Single-Talking Link - Connections, Issue 3, 1961-02-01C71.014, 6A Key Telephone System - Two-Talking Link - Connections, Issue 4, 1961-02-01C71.015.00, 6A Key Telephone System - Holding Arrangement for 6A Stations Using 1A or 1A1 Line and Signaling Circuits, Issue 1, 1961-07-01C71.017, 6A Key Telephone System - Selector Only Arrangement - Maintenance, Issue 2, 1961-08-01C71.018, 6A Key Telephone System - Single-Talking Link Arrangement - Maintenance, Issue 2, 1961-09-01C71.019, 6A Key Telephone System - Two-Talking Link Arrangement - Maintenance, Issue 2, 1961-12-01C71.101.00, 100 Key Equipment - Identification, Issue 1, 1960-01-01C71.101.01, 100 Key Equipment - Installation, Issue 1, 1960-01-01C71.101.02, 100 Key Equipment - Maintenance, Issue 1, 1960-01-01C71.101.03, 100 Key Equipment - Connections, Issue 1, 1960-01-01C71.111, 101A and 101B Key Equipments - Identification, Issue 2, 1961-07-01C71.112, 101A and 101B Key Equipments - Installation, Issue 1, 1959-07-01C71.113, 101A and 101B Key Equipments - Maintenance, Issue 3, 1960-10-01C71.114, 101A and 101B Key Equipments - Connections, Issue 1, 1959-08-01C71.183, 102A Key Equipment - Description and Use, Issue 1, 1959-07-01C71.183, 102A Key Equipment - Description and Use, Issue 1, 1959-07-01C71.263, 110A Key Equipment - Description, Installation and Maintenance, Issue 1, 1959-07-01C71.303, 111A Key Equipment - Description and Use, Issue 1, 1959-06-01C71.331, 1A and 1A1 Key Telephone Systems - Identification, Issue 1, 1957-12-01C71.331, 1A and 1A1 Key Telephone Systems - Identification, Issue 3, 1961-11-01C71.332, 1A and 1A1 Key Telephone Systems - Installation, Issue 3, 1961-02-01C71.333, 1A and 1A1 Key Telephone Systems - Maintenance, Issue 2, 1961-11-01C71.335, 1A Key Telephone System - Connection Data - List of Sections, Issue 1, 1960-03-01C71.336.00, 1A Key Telephone System - Connections - Introduction, Issue 1, 1960-03-01C71.336.01, 1A Key Telephone System - Power Supply Connections, Issue 1, 1960-03-01C71.336.02, 1A and 1B Key Telephone Units - Hold Circuits - Connections, Issue 1, 1960-03-01C71.336.03, 2A, 12B, and 31A Key Telephone Units - Battery Feed Circuits - 23A Key Telephone Unit - Noise Suppression Circuit - Connections, Issue 2, 1961-05-01C71.336.04, 3A Key Telephone Unit - Intercommunicating Signaling Circuit - Connections, Issue 1, 1960-03-01C71.336.05, 5A Key Telephone Unit - Auxiliary Hold Circuit - Connections, Issue 1, 1960-03-01C71.336.06, 6B and 6C Key Telephone Units - Supervisory and Busy Lamp Circuits - Connections, Issue 1, 1960-03-01C71.336.07, 7A Key Telephone Unit - Private Line Circuit - Connections, Issue 1, 1960-03-01C71.336.08, 10A Key Telephone Unit - Automatic Exclusion Circuit - Connections, Issue 1, 1960-03-01C71.336.09, 13C Key Telephone Unit - 2-Way Automatic Signaling Intercommunicating Circuit - Connections, Issue 1, 1960-03-01C71.336.10, 14A and 15D Key Telephone Units - Ringup Relay Circuit - Connections, Issue 1, 1960-03-01C71.336.11, 16A and 20A Key Telephone Units - Common Audible Control Circuits - Connections, Issue 1, 1960-03-01C71.336.12, 17B Key Telephone Unit - Switching Relay Circuit - Connections, Issue 1, 1960-03-01C71.336.13, 18D and 18E Key Telephone Units - Busy and Supervisory Relay Circuits - Connections, Issue 1, 1960-03-01C71.336.14, 19B Key Telephone Unit - Lamp Flashing Circuit - Connections, Issue 1, 1960-03-01C71.336.15, 22-Type Key Telephone Units - DC Lamp Resistance Circuit - Connections, Issue 1, 1960-03-01C71.336.16, 25B Key Telephone Unit - Automatic Cutoff Control Circuit - 26B Key Telephone Unit - Automatic Cutoff Control Circuit - 29A Key Telephone Unit - Cut Through Relay Circuit - Connections, Issue 1, 1960-03-01C71.336.17, 30A Key Telephone Unit - Time-Out Circuit - Connections, Issue 1, 1960-03-01C71.336.18, 33A Key Telephone Unit - Lamp Wink Circuit - Connections, Issue 1, 1960-03-01C71.336.19, Lamp Relay Circuits for Connecting Systems Having Separate Power Supplies - Connections, Issue 1, 1960-03-01C71.336.20, 50-Type Key Telephone Units (Strip Mounted) - Connections, Issue 1, 1960-03-01C71.336.21, 56A Key Telephone Unit - Private Line Circuit - Connections, Issue 1, 1960-03-01C71.336.22, 34A Key Telephone Unit - Make-Busy Lamp and Key Circuit for Central Office or PBX Lines - Connections, Issue 1, 1961-01-01C71.337, 1A1 Key Telephone System - Apparatus and Station Connection Data - List of Sections, Issue 3, 1960-11-01C71.338, 1A1 Key Telephone System (Connection Data) - Introduction, Issue 1, 1957-05-01C71.339, 1A1 Key Telephone System - Power Supply Connections to Key Telephone Units - Connection Data, Issue 3, 1962-02-01C71.340, 1A1 Key Telephone System - Line Pickup, Holding, Line and Busy Lamps, and Common Audible Signal Using 202A and/or 202B and 209A Key Telephone Units - Connection Data, Issue 3, 1959-04-01C71.341.1, 1A1 Key Telephone System - Line Pickup, Holding, Line and Busy Lamps, and Common Audible Signal - 202A, B, C, D; and 212A Key Telephone Units - Connections, Issue 3, 1961-01-01C71.341.2, 1A1 Key Telephone System - Audible Signal Control - Interrupted Common Audible Signal Using 16A or 211A Key Telephone Units - Connections, Issue 3, 1962-02-01C71.341.3, 1A1 Key Telephone System - Central Office or PBX Line Circuits and Common Equipment - 202C/D, 230A/B, 238A, 239A, 232A/B, 209A, 212A Key Telephone Units - Connections, Issue 3, 1961-09-01C71.341.4, 1A1 Key Telephone System - 233A Key Telephone Unit - CO or PBX Line Circuit (Ten Circuits) - Connections, Issue 1, 1960-02-01C71.342.1, 1A1 Key Telephone System - Dial Selective Intercommunicating Circuit with Flashing Line Lamps Using 207A, 207B, or 207C; 208A; and 209A or 212A Key Telephone Units - Connection Data, Issue 3, 1959-06-01C71.342.2, 1A1 Key Telephone System - Dial Selective Intercommunicating Lines, Busy Lamps, and Audible Signal Using 207A, 207B, or 207C Key Telephone Unit - Connection Data, Issue 3, 1959-06-01C71.342.3, 1A1 Key Telephone System - Intercommunicating Lines Using 31A or 211A Key Telephone Units (Connection Data), Issue 1, 1957-06-01C71.343, 1A1 Key Telephone System - Lamp Wink Circuit Using 202A, B, C, D; 230A, B; with 209A and 210A Key Telephone Units - Connections, Issue 3, 1961-03-01C71.344, 1A1 Key Telephone System - Lamp Wink Circuit Using 202A, B, C, D; with 210A and 212A Key Telephone Units - Connections, Issue 3, 1961-03-01C71.345, 1A1 Key Telephone System - Cut Throught and Control Circuit For Automatic Cutoff Using 26B and 29A Key Telephone Units - Connection Data, Issue 3, 1959-02-01C71.345.01, 1A1 Key Telephone System - Manual Cutoff Circuit Using 29A Key Telephone Unit - Connection Data, Issue 1, 1960-04-01C71.346, Key Telephone Sets - 440 and 460 Series - Common Battery - Connections, Issue 3, 1960-06-01C71.347.00, Telephone Sets - 540 and 560 Series - Common Battery - Connections, Issue 1, 1961-05-01C71.347.01, Telephone Sets - 564HDR - Common Battery - Connections, Issue 2, 1961-04-01C71.347.02, Key Telephone Sets - 565HDR - Common Battery - Connections, Issue 3, 1962-03-01C71.347.03, Key Telephone Sets - 565LDR - Common Battery - Connections, Issue 3, 1962-03-01C71.348.00, Separately Mounted Keys - 6021, 6027, 6028, 6040, and 6041 Types - Connections, Issue 1, 1960-01-01C71.348.01, Separately Mounted Keys - 6050 and 6051 Types - Connections, Issue 3, 1962-02-01C71.349.1, 1A1 Key Telephone System - Signal Key and Buzzer Circuits (Connection Data), Issue 1, 1957-06-01C71.349.1, 1A1 Key Telephone System - Signal Key and Buzzer Circuits - Connection Data, Issue 2, 1958-06-01C71.349.2, 1A1 Key Telephone System - Tie and Station Lines - 203A Automatic Tie Line Unit - 204A Ringdown Tie Line Unit - 205A Station Line Unit (Connection Data), Issue 1, 1957-06-01C71.349.2, 1A1 Key Telephone System - Tie and Station Lines - 203A Automatic Tie Line Unit, 204A Ringdown Tie Line Unit, 205A Station Line Unit - Connections and Maintenance, Issue 2, 1962-05-01C71.349.3, 1A1 Key Telephone System - Lamp Resistor Units Located at Station (Connection Data), Issue 1, 1957-06-01C71.501, Audible and Visual Signaling Using 227A Key Telephone Unit, Issue 1, 1958-08-01C71.501A, Selective Signaling - Audible Signal Circuits - Key Telephone Systems 1A - 1A1 - 6A, Issue , 1961-05-01C71.501C, Selective Signaling - Audible Signal Circuit - Arizona Only, Issue A2, 1962-06-01C71.502, 232A or B Key Telephone Unit - Electromechanical Interrupter and Battery Feed Unit, Issue 2, 1961-08-01C71.503, Universal Line Circuit - Key Telephone Systems 1A, 1A1 - Key Equipments 100, 101A, 101B, 102A Using 213B Key Telephone Unit, Issue 1, 1959-11-01C71.504.00, Station Line Concentrators - 235A and 236A Key Telephone Units - Identification and Connections, Issue 2, 1962-06-01C71.505, 1A and 1A1 Key Telephone Systems - Bridging Circuit for Conferencing on Two PBX Lines - 237A and B Key Telephone Units, Issue 3, 1962-03-01C71.507, 259A Key Telephone Unit, Issue 1, 1963-10-01C71.511.00, Packaged Key Telephone Units - 1A1 and 6A - General Description, Issue 1, 1961-11-01C71.511.01, 200F-Type Key Telephone Units, Issue 2, 1961-08-01C71.511.02, 200G-Type Key Telephone Units, Issue 2, 1961-08-01C71.511.03, 200H-Type Key Telephone Units, Issue 3, 1961-09-01C71.511.05, 200K-Type Key Telephone Units, Issue 2, 1961-07-01C71.512.00, Key Service Units - 300, 301, 302, 310, and 311 Types - Identification and Description, Issue 1, 1962-06-01C71.512.01, Key Service Units - 300, 301, and 302 Types - Connections and Maintenance, Issue 1, 1961-12-01C71.512.02, Key Service Units - 310- and 311-Type - Connections and Maintenance, Issue 2, 1963-02-01C71.520.00, Key Service Units - 501 and 502 Types - Identification and Installation, Issue 2, 1963-03-01C71.520.01, Key Service Units - 501 and 502 Types - Connections, Issue 1, 1963-01-01C71.520.50, Key Service Units - 550- and 551- Types - Identification and Installation, Issue 1, 1963-10-01C71.520.75, Panels - 583 and 584 Types - Identification and Installation, Issue 1, 1963-09-01C71.553.00, Code Calling Systems - 1A and 1B - Description and Use, Issue 1, 1960-02-01C71.553.01, Code Calling Systems - 1A and 1B - Maintenance, Issue 1, 1960-02-01C71.553.02, Code Calling Systems - 1A and 1B - Connections, Issue 1, 1960-02-01
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