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The terminal equipment (TE) connected to the BCM system can use some feature codes supported
by the ISDN service provider.
ISDN hardware
To support connections to an ISDN network and ISDN terminal equipment, your BCM must be
equipped with a BRI S/T Media Bay Module (BRIM) or a Digital Trunk Media Bay Module
(DTM) card configured for PRI.
The following describes the hardware:
•
"PRI hardware"
•
"BRI hardware"
PRI hardware
The Digital Trunk Media Bay Module (DTM) is configured for PRI. In most PRI network
configurations, you need one DTM configured as PRI to act as the primary clock reference. The
only time when you may not have a DTM designated as the PRI primary clock reference is in a
network where your BCM system is connected back-to-back with another switch using a PRI link.
If the other switch is loop-timed to your BCM system, your DTM (PRI) can be designated as a
timing master.
If your BCM has more than one DTM configured as PRI, you must assign the first DTM as the
primary reference, the second DTM as the secondary reference.
If the system has a BRI module, it should be set as the timing master when a DTM in the same
network is defined as the primary reference.
BRI hardware
The loops on the BRI module can be programmed to support either network or terminal
connections. This allows you to customize your arrangement of lines, voice terminals, data
terminals and other ISDN equipment. This section describes some basic hardware configurations
for network and terminal connections for each loop type.
A BRI module provides four loops. Each loop can be individually programmed as:
•
an S reference point connection (S loop) to ISDN terminal equipment (TE), or
•
a T or S reference point connection (T loop or S loop) to an ISDN network using an external
NT1.
S Reference Point
The S reference point connection provides either a point-to-point or point-to-multipoint digital
connection between BCM and ISDN terminal equipment (TE) that uses an S interface. Refer to
Figure
9.
S loops support up to seven ISDN DNs, which identify TE to the BCM system.
BCM 4.0 Telephony Device Installation Guide
Chapter 7 ISDN
49
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