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ISDN PRI & BRI

With ISDN (Integrated Services Digital Network) service, there are two types of circuits:

Basic Rate Interface (BRI), intended for the home and small enterprise. Most video phones require a BRI circuit.

Primary Rate Interface (PRI), for larger users.

Both rates include a number of B (bearer) channels and a D (data) channel. The B channels carry data, voice, and other services. The D channel carries control and signaling information. With ISDN there is no wink signalling.

The Basic Rate Interface consists of two 64 Kbps B channels and one 16 Kbps D channel. Thus, a Basic Rate user can have up to 128 Kbps service. The Primary Rate 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.

BRI = Two 64Kbps B-channels + One 16Kbps D-channel
PRI = Twenty-Three 64Kbps B-channels + One 64Kbps D-channel.

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