robbed bit signaling


Also found in: Medical, Acronyms.

robbed bit signaling

A signaling method in a T1 circuit that uses bits from each of the 24 DS-0 channels. When channels carry switched voice traffic, each channel bank must be able to alert the other when a call is being placed on that channel. T-carrier systems grab one bit from each sixth voice sample to do this, which works out to 1,333 bps from the 64 Kbps channel. When a channel is seized from one end, the signaling bit is changed from 0 to 1 to alert the far end.

The other signaling option is an ISDN PRI circuit where all signals travel in a separate, shared "D" channel carried in the 24th time slot. See T1, B8Zs and ones density.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
Usability enhancements including alarm tracking, full E1 SA bit manipulation and the Robbed Bit Signaling model specified in EIA 464.