Primary Rate Interface

Each ISDN B channel can be used separately to allow two different connected users at the same time. The ISDN B channels can also be combined to provide a total bandwidth of 128 Kbps.

Primary Rate Interface

The ISDN Primary Rate Interface, like BRI, has one D channel, but it has more than two B channels. The number of B channels for PRI differs from the United States to Europe.

In the United States and Japan, PRI consists of 24 digital channels: one D channel and 23 B channels.

In Europe, PRI consists of 31 digital channels: one D channel and 30 B channels.

These channels can all be used simultaneously, and are often referred to as 23B+D (for the United States and Japan) or 30B+D (for Europe).

Each ISDN B channel can be used separately to allow multiple connected users at the same time. The ISDN B channels can also be combined to provide a total bandwidth of 1920 Kbps for Europe, or 1472 Kbps for the United States and Japan.

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Interphase Corporation