Nortel Networks 400 4.0, BCM200 manual Digital trunk media bay module

54Chapter 2 Introducing the BCM hardware

Table 8 Trunk MBMs (Sheet 2 of 2)

MBM	What it does	Special notes
ISDN BRI	Connects a maximum of four ISDN BRI
(see “Basic rate interface media	S/T interfaces.
bay module” on page 55)
GATM4/GATM8	Connects either four (GATM4) or eight
(see “Global analog trunk media	(GATM8) analog public switched
	telephone lines to the BCM system.
bay module” on page 56)
Note: Refer to “Market profile attributes” on page 351 for supported market profiles.

Digital trunk media bay module

The digital trunk media bay module (DTM) connects to a standard digital PSTN T1/fT1, E1/fE1, or PRI ISDN line using either a digital or PRI line. The DTM also supports DASS2, DPN22, Q.SIG, and MCDN over ISDN:

•On North American BCM systems, the DTM connects a T1 or PRI circuit to the BCM system; T1 circuits provide 24 digital channels to the PSTN, while PRI circuits provide 23 digital channels to the PSTN.

•On International BCM systems, the DTM connects an ETSI ISDN (E1) or PRI (EI) circuit to the BCM system, providing a maximum of 30 digital channels to the PSTN.

Warning: Install DTMs in the BCM main unit only. DTMs do not function if installed in the BCM expansion unit.

If there are no empty MBM bays in the BCM main unit, move MBMs to the expansion unit to provide space for the DTMs.

The front bezel of the DTM has an RJ-48C connector that connects the DTM to the service provider connection point. The faceplate also has a set of monitor jacks you can use to monitor the span.

There are six additional LEDs on the front of the DTM. For information about these additional LEDs, refer to “DTM LEDs” on page 80.

Figure 27 shows the DTM module interfaces.

Figure 27 DTM faceplate

Monitor jacks	RJ-48C digital
	telephone line
	connector

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