from
The Free On-line Dictionary of Computing (8 July 2008)
Basic Rate Interface
2B1D
2B+D
BRI
<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.
(2002-01-13)