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Chapter 2 Telephony hardware 73
Installation and Maintenance Guide
Trunk media bay modules
You install the trunk media bay modules in the BCM1000 or the BCM1000e. Trunk media bay
modules connect telecommunications lines to the Business Communications Manager hardware.
These are determined by:
• which lines are available from your telephone service provider
• what lines you require for the types of telephones you want to use
• budget considerations
Table 7 lists the types of trunk media bay modules that are available for the Business
Communications Manager system:
Table 7 Trunk media bay modules
Module type What it does Special notes
DTM
“Digital Trunk media bay module”
Connects digital public switched
telephone lines to the Business
Communications Manager system.
Can connect to four types of lines: TI,
NA PRI, ETSI (in UK only), and Euro
PRI.
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.
See also “4X16 media bay module” on
page 79.
BRI
“Basic Rate Interface media bay
module”
Connects a maximum of four ISDN
BRI interfaces
Note: The DECT module contains the
equivalent of a BRI module and does
not require a separate module for trunk
line functions.