Basic Rate Interface
<communications> (BRI, 2B+D, 2B1D) An Integrated Services Digital 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.
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