Nortel Networks BCM1000 - Manual (Page 111)

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Installation and Maintenance Guide
Chapter 4
Selecting the media bay modules for your system
The media bay modules are the devices in the Business Communications Manager system that
permit you to connect your extensions and the public switched telephone network (PSTN) lines to
the call processing capabilities of the Business Communications Manager system.
A special media bay module called a Fiber expansion module (FEM) allows you to update from a
Norstar system to a BCM1000 by reusing the Norstar expansion modules and the fiber cables to
the modules.
When you order your Business Communications Manager system, there are no media bay modules
installed in the BCM1000 or the BCM1000e. This configuration allows you to select the number
and type of media bay modules that best meet your requirements.
If you have a large Business Communications Manager system, there are some configuration
restrictions that can apply to your system. For information about these restrictions, refer to
“Rules
for assigning DS30 channels” on page 135 .
Figure 36 Process for determining modules
The first step in selecting the media bay modules is to determine the number of extensions
(internal lines) and PSTN lines (trunk lines) you have or need. This determines how many media
bay modules you require, and what type of modules you require. These following sections describe
how to determine which modules, and how many, you require for your system.
After you determine which modules you want to use, you must ensure they fit into the available
system resources. These sections describe how the modules work within the available DS30
channels of the Business Communications Manager.
Determine DS30
channel requirements
for each module
Determine if any
offsets can be used
Set DIP switches on modules
Install modules into the
BCM1000 or BCM1000e
Determine trunk
and extension
requirements
Determine which
DS30 channels
are available