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Designing ISDN Internetworks 11-7

Introduction

ISDN Interfaces

ISDN provides multiple data channels—two B channels for BRI service (2B+D), 23 B channels for

T1 PRI (23B+D), or 30 B channels for E1 PRI (30B+D). This section describes the way Cisco

products identify ISDN interfaces.

Basic Rate Interface

The ISDN BRI provides 2 B channels for sending and receiving data at 64 kbps, and 1 D channel for

signaling or communicating with the ISDN switch at 16 kbps. The two B channels are automatically

placed in a rotary group. On ISDN dialers conﬁgured for X.25 encapsulation (Cisco IOS Software

Release 10.2), however, only one B channel can be used.

Cisco has received certiﬁcation for ISDN BRI compliance for the countries listed in Table 11-4.

Table 11-4 Certiﬁcation for ISDN BRI Compliance

On the AccessPro PC card, the BRI interface is identiﬁed by “interface B0.”

On the Cisco 1003/4, 2503/4, and 2516/17 routers, the ISDN BRI is identiﬁed by “interface bri 0.”

On the Cisco 4000 series router, the ISDN interfaces are numbered 0 through 3 (for the four-port

MBRI) and 0 through 7 (for the eight-port MBRI.) If two four-port MBRIs are installed, the

interfaces are numbered from 1 through 8, and if two eight-port MBRIs are installed, the interfaces

are numbered 1 through 16.

PRIs

The ISDN PRI for the United States, Canada, and Japan provides 23 B channels and one D channel

(all at 64 kbps) for a cumulative speed equivalent to T1 (1.5 Mbps). The B channels are

automatically placed in a rotary group. ISDN for Europe provides 30 B channels and one D channel

(all at 64 kbps) for a cumulative speed equivalent to E1 (2 Mbps). ISDN PRI is supported with Cisco

IOS Software Release 10.2 for 5ESS, 4ESS, and DMS-100 in North America.

In the United States, the T1 MIP card provides PRIs on Cisco 4000 or Cisco 7000 series routers. To

conﬁgure a MIP card, use the controller global conﬁguration command. The controller command

speciﬁes the type of interface (T1 or E1), the slot in which the MIP card is installed, and the port that

is being conﬁgured. Then use the framing and linecode controller conﬁguration commands to

specify the framing type and the line code type, which are required for T1 and E1 connections.

To specify that the MIP card is to be used as an ISDN PRI, use the pri-group controller conﬁguration

command. If only a portion of the channels are to be used for ISDN, use the timeslots keyword and

specify the range of channels that is to be used for ISDN.

Australia Germany Spain

Austria Ireland Sweden

Belgium Japan Switzerland

Canada New Zealand The Netherlands

Denmark Norway United Kingdom

Finland Portugal United States

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