IBM SC30-3681-08 Chapter 45. Using the ISDN Interface

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“ISDN Overview”
v“ISDN Cause Codes” on page614
v“Sample ISDN Configurations” on page616
v“Channelized T1/E1” on page 617
v“Requirements and Restrictions for ISDN Interfaces” on page618
v“Before You Begin” on page 619
v“Configuration Procedures” on page 619.
v“ISDN I.430 and I.431 Switch Variants”on page 625
v“X.31 Support” on page 626
ISDN Overview
The ISDN interface software allows you to interconnect routers over ISDN. Youcan
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 611
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