Nortel BCM200 Installation And Maintenance Manual page 56

56 Chapter 2 Introducing the BCM hardware
Figure 28 CTM4 and CTM8 module faceplate LEDS and connectors
CTM 4
1 Aux
CTM4
Power LED
Status LED
Line 1
Aux
Line 2
Line 3
Line 4
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.
page 56 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.
LEDs and RJ-21 connector. The GATM is available either in four-port (GATM4) or eight-port
(GATM8) configurations.
N0060612 N0060612
2 3 4
Front View
8
CTM 8
1
Line 1
Auxiliary port
Auxiliary port
Line 5
Figure 30
7 6 Aux 5
Aux 2 3
CTM8
Figure 29 on
shows the GATM faceplate
4