Nortel Networks 400 4.0 User Manual

Chapter 2 Introducing the BCM hardware

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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. 

 shows the BRIM faceplate LEDs and connections.

Figure 29   BRIM faceplate

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. 

 shows the GATM faceplate 

LEDs and RJ-21 connector. The GATM is available either in four-port (GATM4) or eight-port 
(GATM8) configurations. 

Figure 30   GATM faceplate

Station (MBM) connect telephones and analog telecommunication devices to the BCM system. 

 lists the available station MBMs.

Table 9   Station MBMs (Sheet 1 of 2)

DSM16(+)/DSM32(+)

(see

)

Connects a maximum of 16 (DSM16+) or 
32 (DSM32+) digital telephones to the 
BCM system.

4x16
Combination of a CTM4 and a DSM16

(see 

Connects a maximum of four analog 
public switched telephone lines to the 
BCM system. 

Also connects a maximum of 16 digital 
telephones to the BCM system.