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General| Category | Telephone System |
|---|---|
| Document Number | 636A |
| Issuing Organization | Bell System |
| Title | Bell System Practices |
| Section | General |
Provides connection and maintenance info for CALL DIRECTOR sets with headset jacks.
Details revisions made to the section, including title changes and updates.
Specifies sets are not for use with 3-type speakerphone systems.
Details factory wiring for KTS line circuits and modification for 1A KTS.
Describes headset jacks and internal wiring for line switch or headset connection.
Notes potential wiring changes when replacing keys in the first module.
Explains the need for a P-90D033 board for station busy lamp feature.
Outlines circuit requirements for sets with D120C cords manufactured before III-68.
Details routing for tip and ring leads for supplementary hold feature.
Details arrangements and wiring for supplementary hold feature.
Describes converting key positions from pickup to signal (nonlocking).
Notes the use of 657B or 599B keys for ringer or line cutoff control.
Refers to other sections for maintenance of handsets, dials, ringers, and keys.
Refers to Section 502-600-100 for common installation and maintenance.
Wiring modifications for shop-wired 1A1 or 1A2 systems.
Wiring for 1A1/1A2 on the first key unit, 1A on others.
Wiring for 1A1/1A2 on first two key units, 1A on others.
Wiring for 1A1/1A2 on first three units, 1A on others (30-button).
Wiring for 1A1/1A2 on first four units, 1A on fifth (30-button).
Wiring modifications specific to 1A only systems.
Lists conversion options for pickup-signal keys in 3rd or 5th module.
Provides notes on converting key modules and button types.
Details cutoff station features for 1A, 1A1, and 1A2 systems.
Describes cutoff functions for external and internal ringers/buzzers.
Specifies terminal connections for monitoring.
Details modifications for the station busy lamp circuit.
Provides notes on relay ranges and busy lamp feature with D120C cord.
Shows priority hold connections using the 657L key.
