Nortel Networks BCM200/400 - Manual (Page 58)

58 Chapter 2 Introducing the BCM hardware
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Figure 28 CTM4 and CTM8 module faceplate LEDS and connectors
Basic rate interface media bay module
The basic rate interface media bay module (BRIM) connects a maximum of four BRI ISDN loops
to the BCM 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 BCM system. Therefore, each
BRIM adds a maximum of eight lines to the BCM 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.
Figure 29 on
page 58 shows the BRIM faceplate LEDs and connections.
Figure 29 BRIM faceplate
Global analog trunk media bay module
The global analog trunk media bay module (GATM) provides an interface for four or eight analog
public switched telephone network (PSTN) lines. The GATM 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. Figure 30 shows the GATM faceplate
LEDs and RJ-21 connector. The GATM is available either in four-port (GATM4) or eight-port
(GATM8) configurations.
CTM4
Power LED
Status LED
Line 1
Aux
Line 2
Line 3
Line 4
CTM8
Line 1
Auxiliary port
Auxiliary port
Line 5
CTM 4
1 Aux 2 3 4
CTM 8
1 Aux 2 3 4
8 7 6 Aux 5
Front View