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Installation and Maintenance Guide

Chapter 2

Telephony hardware

The BCM1000 is a modular system. You can i ncrease the capacity of your Business
Communications Manager by adding more tele phony ha rdware 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 tha t can be added to your system is
determined by the number of medi a bays tha t are open, combined with the number of DS30 buses
each component occupi es. Eac h Busine ss Communi catio ns Manager system ha s a m aximum of si x
DS30 buses available to media bay modules.
If your syst em require s many IP lines or trunk s, you can reduce the number of DS3 0 buses that are
assigned to m odules and increase the number of buse s available to IP telephones. This is called a
3/5 DS30 split. In t his case, you only have five DS30 buse s available to media bay modules. Refer
to “Understanding DS30 bus blocks” on page 61 for m o re inf o rma t ion.
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 f or c onnecting digital telephones. To use the FDD feature, DSM16+, DSM 32+ me dia
bay modules are configured to double density and ASM mod ules are configur ed to four offsets
instead of two. DS3 0 06 and 07 default to PDD, but can be config ured to FDD. However,
Companion telephones can only be supported if 06 and 07 left in the PDD sta te.
Refer t o Chapter 4, “Select ing the m edia bay modules for your system,” on page 57 f or details
about determ ining how many media bay modules can be installed in a system.
As well, this chapter describes the various types of telephone equipment tha t can be used with the
Business Communications Manager system. Fig ure 1 1 pr ovides pointers to the sections that
describe the modules and telephones that can be installed into the BCM1000.
Warning: C hanging the DS30 split
If you change the DS 30 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 c hange t he DS30 split f rom a 3/5 spl it to a 2/6 s plit after the system i s init ialize d, all
data is lost and all optiona l applications mus t 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.