scope:

This standard applies to Adaptive Differential Pulse-Code Modulation (ADPCM) telecommunications systems where the channel pulse rate is 32 kbit/s.

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This standard provides for line formats used in Bundle, Transition, and Robbed-Bit Signaling modes for transcoded channels comprising channel pulse rates of 32 kbit/s combined in a line format operating at a pulse rate of 1544 kbit/s.

Section 3 of American National Standard for Telecommunications - Digital Processing of Voice-Band Signals - Algorithms for 24-, 32-, and 40-kbit/s Adaptive Differential Pulse-Code Modulation (ADPCM), ANSI T1.303-1989, specifies the 24- and 32-kbit/s ADPCM algorithms. Therefore the low bit-rate voice (LBRV) terminals that use the Bundle and lmnsition signaling line formats shall comply with the 32-kbit/s algorithm and those terminals that use the Robbed-Bit signaling line format shall comply with the 24- and 32-kbit/s algorithms as described in that section.

This standard provides for interface specification defining bit formats and actions associated with transcoder interfaces that use these line formats.