Selecting The Trunk Media Bay Modules; Table 8 Determining Trunk Module Requirements - Nortel BCM1000 Installation And Maintenance Manual

60 Chapter 4 Selecting the media bay modules for your system

Selecting the trunk media bay modules

The number and type of lines coming into your system determine which trunk media bay modules,
and how many modules, you require to support your needs. Trunk lines come from either the
public network (PSTN), or they support connections in a private network.
If you are setting up an entirely new system, a site survey must be done to determine your current
and future needs. We recommend that you do the survey before you order any modules.
Note: If you plan to add any lines in the near future, include them in your initial estimates.
To select the trunk media bay modules:
Record the number of each type of line you have in
1
If you do not know the number or type of lines you have, contact your service provider.
Use the number of lines and the number of lines per module to determine how many modules
2
you need.

Table 8 Determining trunk module requirements

Type of lines
T1 digital lines
PRI digital lines (NA)
E1 digital lines
PRI digital lines (EMEA)
Analog lines
Analog lines
Analog lines
Analog lines
Analog lines
BRI ISDN lines
N0008587 01
Type of media bay
Number of lines module
DTM
DTM
DTM
DTM
CTM
(North American
systems only)
GATM4
CTM8
(North American
systems only)
GATM8
4X16 combination
module
(North American
system only)
BRI
Table 8.
Number of lines Number of modules
per module required
24 ______ DTM
23 ______ DTM
30 ______ DTM
30 ______ DTM
4 ______ CTM
4 ______ GATM4
8 ______ CTM8
8 ______ GATM8
4 ______ CTM4
(also requires a
full DS30 bus for
the DNs)
4 ISDN loops (8 ______ BRI
lines)