Nortel Networks BCM1000 manual Chapter Selecting the media bay modules for your system

57

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 bus blocks and offsets” on page 83.

Figure 24 Process for determining modules

Determine trunk	Determine which
and extension	DS30 bus blocks
requirements	are available
Determine DS30 bus	Set DIP switches on modules
requirements for
each module
Determine if any	Install modules into the
	BCM1000 or BCM1000e
offsets can be used

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 bus blocks of the Business Communications Manager.

Installation and Maintenance Guide