Chapter 45. Using the ISDN Interface

This chapter describes the Integrated Services Digital Network (ISDN) interfaces on

the IBM 2210. It includes the following sections:

 

v ªISDN Overviewº

 

v ªISDN Cause Codesº on page 614

 

v ªSample ISDN Con®gurationsº on page 616

 

v ªChannelized T1/E1º on page 617

 

v ªRequirements and Restrictions for ISDN Interfacesº on page 618

 

v ªBefore You Beginº on page 619

 

v ªCon®guration Proceduresº on page 619.

 

v ªISDN I.430 and I.431 Switch Variantsº on page 625

 

v ªX.31 Supportº on page 626

 

 

 

ISDN Overview

 

The ISDN interface software allows you to interconnect routers over ISDN. You can

 

set up the interface to act as a dedicated link or to initiate and accept

 

switched-circuit connections, either on demand, automatically from restart, or on

 

command by the operator.

I.430, I.431, and Channelized T1/E1 are not switched. They are permanent

leased-line type connections.

 

ISDN Adapters and Interfaces

The following ISDN adapters are available for the 14T, 24T, 24E, and 24M models:

v1-Port S/T ISDN-BRI

v4-Port S/T ISDN-BRI

v4-Port U ISDN-BRI

v1-Port Channelized E1 120-ohm ISDN-PRI

v1-Port Channelized T1/J1 ISDN-PRI

The PRI/Channelized adapters have an integrated CSU/DSU, so an external

CSU/DSU is not required.

The interfaces are:

vBasic Rate Interface (BRI)

The Basic Rate Interface provides two 64-Kbps (Kilobits per second) bearer (B) channels and one 16-Kbps data (D) channel. The B-channels are used as HDLC frame delimited 64-Kbps pipes. The D-channel is used to set up calls. The D-channel can also be used for X.25 traffic.

vPrimary Rate Interface (PRI)

The Primary Rate Interface provides functions that are similar to those provided by the Basic Rate Interface. However, there are some important differences:

± The PRI adapter does not support multipoint. The BRI adapter does.

© Copyright IBM Corp. 1994, 1998

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