Nortel Networks BCM50 - Manual (Page 42)

42 Chapter 2 Introducing the BCM50 hardware
NN40020-302
Figure 10 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 recognizes only 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. The figure
BRIM faceplate on page 42 shows the BRIM faceplate LEDs and connections.
Figure 11 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 Disconnect Supervision in selected markets throughout the world.
The GATM uses an RJ-21 connector as the trunk interface. The figure GATM faceplate on page
43 shows the GATM faceplate LEDs and RJ-21 connector. The module is available either in
four-port (GATM4) or eight-port (GATM8) configurations.
Monitor jacks RJ-48C digital
telephone line
connector