in-band

communications (bit-robbing) The exchange of call control

information on the same channel as the telephone call or data

transmission. Since one bit in a frame is periodically used

for signalling instead of data, this is often referred to as

bit robbing.

This is the reason why a D1 channel in the T-carrier system

can only carry 56 Kbps of usable data instead of the 64 Kbps

carried by the D0 channel in the E-carrier system.

(2000-03-10)