What is Basic Rate Interface?
The Basic Rate Interface (BRI) is one of the two levels of service provided by the Integrated Services Digital Network (ISDN). BRI is suitable for use at home and in small businesses. It consists of two carrier channels (B channels) and one data channel (D channel) for the transmission of data. The B-channel carries data, voice and other services, while the D-channel carries control and signaling data.
ISDN has made the reliable transmission of data possible, in which several users can use the service lines at the same time. This network architecture is economical for small industries and households, where dedicated lines, modems and cabling costs must be kept low. A bearer channel has a bit rate of 64 Kbps, while a data channel is 16 Kbps. Two bearer channels can be combined by channel connection to obtain an aggregated data rate of 128 Kbps. B-channels have dedicated bandwidth and transmit data over a formatted and circuit-switched channel, while D-channels transmit data in the form of packets. The format of data communication in the D-channel has become the basic type of frame relay.