Nortel Networks BCM200/400 - Manual (Page 56)

56 Chapter 2 Introducing the BCM hardware
N0060612 N0060612
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.
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 82 .
Figure 27 shows the DTM module interfaces.
ISDN BRI
(see “Basic rate interface media
bay module” on page 58 )
Connects a maximum of four ISDN BRI
S/T interfaces.
GATM4/GATM8
(see “Global analog trunk media
bay module” on page 58 )
Connects either four (GATM4) or eight
(GATM8) analog public switched
telephone lines to the BCM system.
ADID4/ADID8
(see Analog direct inward dialing
media bay module on page 59)
Connects either four (ADID4) or eight
(ADID8) analog DID interfaces.
Note: Refer to “Market profile attributes” on page 361 for supported market profiles.
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.
Table 8 Trunk MBMs (Sheet 2 of 2)
MBM What it does Special notes