Bit robbing
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Bit robbing, used for transmitting signaling information, is the practice or technique of preempting at regular intervals one time slot that is associated with the given user channel for which signaling is required and is used primarily for transporting encoded speech via that channel. Bit robbing is used in digital carrier systems.
Bit robbing is an option used in T-carrier-compatible networks, e.g. ISDN .
In conventional T-carrier systems, bit robbing uses, in every sixth frame, the least significant bit in the time slot associated with the voice channel, e.g. Channel Associated Signaling (CAS), or speech digit signaling.