A&B

<communications> A bit signaling procedure used in most T1 transmission facilities where one bit from every sixth frame of each of 24 T1 subchannels is used for carrying supervisory signaling.

[What does it stand for?

Is this the same as "bit robbing"?]

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AAP DTD aard AARP AARP probe packets AAUI		abbrev Abbreviated Test Language for Avionics Systems ABC ABC ALGOL ABCL/1