scope:

Purpose

This supplement addresses two oversights of ANSI T1.302-1989, Digital Processing of Voice-Band Signals - Line format for 32-kbit/s Adaptive Differential Pulse-code Modulation. Clause 3 of ANSI T1.302-1989 describes the line format for transcoders using the bundle format but does not specify a line format for channels that are programmed to bypass the ADPCM algorithm and that are transmitted as digital or PCM data. Clause 5 of ANSI T1.302-1989 describes the line format for transcoders using robbed-bit signaling but does not specify a method for transmitting downstream alarms. The purpose of this supplement is to eliminate these oversights.

Channel control templates: This supplement specifies the delta channel format for applications requiring 64-kbit/s pass-through channels. This supplement also includes annex A, which contains 64 suggested channel-control templates, specifically, thirty-seven general-purpose channel-control templates, twenty-five channel-control templates for integrated Services Digital Network (ISDN) applications, as well as applications that use the old data port plug-ins, and two 768-kbit/s and 1536-kbit/s templates. These channel-control templates provide for the integration of voice, voice-band data, and digital data signals.

Alarm transmission: This supplement specifies the method by which downstream alarms received on streams X or Y are transmitted on stream Z when robbed-bit signaling is used.