Basic Rate Interface Media Bay Module; Global Analog Trunk Module; Figure 14 Dtm Faceplate; Figure 15 Brim Faceplate - Nortel BCM50 Installation And Maintenance Manual

62 Telephony components

Figure 14 DTM faceplate

Basic rate interface media bay module

The basic rate interface media bay module (BRIM) connects a maximum of four BRI ISDN loops
to the BCM50 system. The BRIM only recognizes the T interface used in European networks. To
use the BRIM with the U interface, typical in North American networks, you require an external
NT1 box to convert the U interface to a T interface.
Each BRI ISDN loop you connect adds two telephone lines to the BCM50 system. Therefore, each
BRIM adds a maximum of eight lines to the BCM50 system through the four RJ-48C jacks on the
faceplate. The LEDs beside each RJ-48C jack are on when the ISDN line is active.
shows the BRIM faceplate LEDs and connections.

Figure 15 BRIM faceplate

Global Analog Trunk Module

The Global Analog Trunk Module (GATM) provides an interface for four or eight analog public
switched telephone network lines. This module supports both pulse and tone dialing, as well as
Caller ID and Supervision Disconnect in selected markets throughout the world. Contact your
sales representative for specific market compatibility.
The GATM uses an RJ-21 connector as the trunk interface.
GATM faceplate LEDs and RJ-21 connector. The module is available either in four-port
(GATM4) or eight-port (GATM8) configurations.
Introduction to the BCM50 hardware
Continuity Loopback
loopback
RJ-48C digital
telephone line
connector
Figure 16 on page 63 shows the
Figure 15