Interphase Tech iSPAN 5535 PRI Uživatelský manuál stáhnout pdf (Strana 146)

Primary Rate Interface

126 Interphase Corporation

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 Tech iSPAN 5535 PRI Uživatelský manuál Strana 146