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70 Chapter 1 Introduction to the Business Communications Manager Platform Hardware
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The system also supports four types of cordless telephone systems: Companion, DECT, T7406
Business Series Terminal, and the Symbol NetVision and NetVision Data telephones.
Companion installation information is included in this guide and in the Programming
Operations Guide. Installation documentation for the other three systems is provided in
separate documentation for each system. Refer to “Telephones and adapters” on page 74 for
information about the handsets and the hardware they use to connect to the system.
This section describes the media bay module (MBM) telephony components and various types of
telephone equipment used with the Business Communications Manager system. Figure 36 points
to the sections that describe the modules and telephones that can be installed into the base function
tray.
The Business Communications Manager system is modular. You can increase the capacity of the
system by adding more telephony hardware components (media bay modules - MBMs). Each
Business Communications Manager allocates a maximum of six DS30 channels to the media bay
modules. The number of media bay modules that can be added to your system is determined by the
number of media bays that are open, combined with the number of DS30 channels each
component uses.
If your system requires many IP lines or trunks, you can reduce the number of DS30 channels that
are assigned to modules and increase the number of channels available to IP telephones. This is
known as a 3/5 DS30 channel split. In this case, you only have five DS30 channels available for
use by the media bay modules. Refer to “Understand DS30 numbers” on page 317 for more
information.
Refer to Chapter 4, “Install, remove or replace the Media Bay Modules,” on page 109 for details
about determining how many media bay modules can be installed in a system.
Warning: Changing the DS30 channel split
If you change the channel split from 2/6 (default) to 3/5 after the system is initialized, any
module set to DS30 channel 7 or requiring the use of channel 7 becomes inoperable.
If you change the channel split from a 3/5 split to a 2/6 split after the system is initialized,
all data is lost and all optional applications must be reinstalled and reconfigured.