Definition

Basic Rate Interface (BRI)

In the Integrated Services Digital Network (ISDN), there are two levels of service: the Basic Rate Interface (BRI), intended for the home and small enterprise, and the Primary Rate Interface (PRI), for larger users. Both rates include a number of B-channels and a D-channel. Each B-channel carries data, voice, and other services. The D-channel carries control and signaling information.

The Basic Rate Interface consists of two 64 Kbps B-channels and one 16 Kbps D-channel. Thus, a Basic Rate Interface user can have up to 128 Kbps service. The Primary Rate Interface consists of 23 B-channels and one 64 Kpbs D-channel in the United States or 30 B-channels and 1 D-channel in Europe.

For more information, see ISDN. For comparison with other Internet connection services, see The speed of....

Related glossary terms: RS-232C, encoder, online, BOC (Bell operating company), Peltier effect, LEC (local exchange carrier), IT Survival Kit: Networking refreshers, downstream, Usenet, network configuration management (NCM)

This was last updated in September 2005

Posted by: Margaret Rouse

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