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Chapter 1 Introduction to the Business Communications Manager Platform Hardware 75
Installation and Maintenance Guide
Digital trunk media bay module
The Digital Trunk media bay module (DTM) connects to 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 Business Communications Manager systems, the DTM connects to a T1
or PRI line. With a T1 line, you can add a maximum of 24 digital telephone lines. With a PRI
line, you can add a maximum of 23 digital telephone lines.
• On International Business Communications Manager systems, the DTM connects to an ETSI
or PRI digital line. With an ETSI or PRI line, you can add a maximum of 30 digital telephone
lines.
The front bezel of the DTM has a RJ48C connector that connects the DTM to the service provider
connection point. The faceplate also has a set of loopback connectors you can use to run loopback
tests. For details on loopback tests, refer to the Business Communications Manager 3.0
Programming Operations Guide. Figure 40 shows the DTM module interfaces.
Figure 40 Digital Trunk Interface Module (DTM) faceplate
CTM
“Caller ID trunk media bay
module”
CTM8
“Caller ID trunk media bay
module”
Connects a maximum of four analog
public switched telephone lines to the
Business Communications Manager
system.
Connects a maximum of eight analog
public switched telephone lines to the
Business Communications Manager
system.
Only available for North American
systems.
BRI
“Basic rate interface media bay
module”
Connects a maximum of four ISDN
BRI S/T interfaces
Note: The DECT module contains the
equivalent of a BRI module and does
not require a separate module for trunk
line functions.
Table 9 Trunk media bay modules (Continued)
Power LED
Status LED
In Service LED
Loopback Test LED
Continuity Loopback
Receive LEDs
Transmit LEDs
Loopback
RJ48C digital telephone line connector
Front view
DTM