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Installation and Maintenance Guide
Chapter 2
Telephony hardware
The BCM1000 is a modular system. You can increase the capacity of your Business
Communications Manager by adding more telephony hardware components known as media bay
modules.
The BCM1000 accommodates three media bay modules. The BCM1000e accommodates an
additional six 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 buses
each component occupies. Each Business Communications Manager system has a maximum of six
DS30 buses available to media bay modules.
If your system requires many IP lines or trunks, you can reduce the number of DS30 buses that are
assigned to modules and increase the number of buses available to IP telephones. This is called a
3/5 DS30 split. In this case, you only have five DS30 buses available to media bay modules. Refer
to “Understanding DS30 bus blocks” on page 61 for more information.
BCM 3.0 software introduced the concept of Full Double Density (FDD) and Partial Double
Density (PDD). On the default system, DS30 02 to 05 were defaulted to FDD, which provides 32
new ports for connecting digital telephones. To use the FDD feature, DSM16+, DSM32+ media
bay modules are configured to double density and ASM modules are configured to four offsets
instead of two. DS30 06 and 07 default to PDD, but can be configured to FDD. However,
Companion telephones can only be supported if 06 and 07 left in the PDD state.
Refer to Chapter 4, “Selecting the media bay modules for your system,” on page 57 for details
about determining how many media bay modules can be installed in a system.
As well, this chapter describes the various types of telephone equipment that can be used with the
Business Communications Manager system. Figure 11 provides pointers to the sections that
describe the modules and telephones that can be installed into the BCM1000.
Warning: Changing the DS30 split
If you change the DS30 split from 2/6 (default) to 3/5 after the system is initialized, any
module set to DS30 07 or requiring the use of DS30 07 becomes inoperable.
If you change the DS30 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.
Warning: Changing DS30 06 and 07 to FDD
Once you change DS30 06 and 07 to FDD, Companion telephones can no longer
be supported. This change cannot be reversed.