<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.25paCket networking. BRI is the kind of ISDN interfaCe most likely to be found in residential serviCe. (2002-01-13)