communications (BRI, 2B+D, 2B1D) An Integrated ServicesDigital Network channel consisting of two 64 kbps "bearer"

(B) channels and one 16 kbps "delta" (D) channel, giving a

total data rate of 144 kbps. The B channels are used for

voice or user data, and the D channel is used for control and

signalling and/or X.25 packet networking. BRI is the kind

of ISDN interface most likely to be found in residential

service.