Short for Delta-channel
, the channel
in an ISDN
connection that carries control and signaling information. Basic Rate ISDN (BRI) service consists of two 64 Kbps
B-channels, and one D-channel for transmitting control information. Primary ISDN service consists of 23 B-channels (in the U.S.) or 30 B-channels (in Europe).
Compare with B-channel.