Nortel Networks BCM1000 manual Chapter Telephony hardware

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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.

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.

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.

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.

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.

Installation and Maintenance Guide