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Tele-Communication (Telecom) Terms Glossary and Dictionary
A&B Bit Signaling
A&B Bit Signaling, also called 24th channel signaling, is a procedure used in T1 transmission facilities in which each of the 24 T1 subchannels devotes 1 bit of every sixth frame to the carrying of supervisory signaling information. On T1 lines that use Extended SuperFrame(ESF) framing, the signaling bits are robbed from the 6th, 12th, 18th, and 24th frame, resulting in "ABCD" signaling bits.
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