Filter
Top Products
313
Installation and Maintenance Guide
Appendix B
Telephony Hardware Selection and Settings
Media Bay Module System Selection
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 Business Communications Manager 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 Business Communications Manager base platform chassis or Business
Communications Manager expansion unit. You are able to select the number and type of media
bay modules that best suit your business 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 resources” on page 322.
Figure 192 Process for determining modules
The first step in selecting the media bay modules is to establish the number of extensions (internal
lines) and PSTN lines (trunk lines) you have or need. This determines the number and type of
media bay modules you require. The following sections describe how to determine which
modules, and how many, you require for your system.
After you determine the modules types required, calculate how they use the available system
resources. These sections describe how the modules work within the available channels on the
Media Services Card (MSC) in the Business Communications Manager.
Determine DS30
requirements for
each module
Determine if any
offsets can be used
Set DIP switches on
modules
Install modules into the
BCM or expansion unit
Determine trunk
and extension
requirements
Determine which
DS30 buses are
available