1. Basic Rate Interface 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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