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Chapter 4 Selecting the media bay modules for your system
An example for North America:
•
If you require 12 digital extensions, you need one DSM 16.
•
If you require 24 digital extensions, you need one DSM 32.
Note: If you require only a few analog extensions, you can use a Business
Communications Manager ATA 2 to connect these devices to your DSM 16, DSM 32 or
the DSM connector on a 4X16 module. Each analog extension requires a Business
Communications Manager ATA 2.
Upgrading from an existing Norstar system
A special media bay module allows you to convert existing Norstar expansion modules from the
Norstar ICS to full Business Communications Manager capability.
The FEM allows you to connect a maximum of six Norstar expansion modules to a BCM1000.
Each expansion module connection requires one DS30 bus, therefore, the BCM1000 used for this
purpose can only support one FEM module (and no BCM1000e) if you are converting a
fully-configured Norstar system.
Determining system capacity
After you have selected the modules you require, you must ensure that the Business
Communications Manager can support all the modules. This is determined by the DS30 bus
requirements of each module.
The following sections describe these bus blocks and how you fit your modules into the overall
system planning.
Understanding DS30 bus blocks
A DS30 bus is a block of virtual pathways on the media services card (MSC).
On a default system, six DS30 bus blocks can be assigned to media bay modules. The block to
which the module is assigned determines the range of line (trunk) numbers or extension numbers
(DNs) that can be allocated by the module to the equipment connected to that module. The first
and last DS30 blocks are permanently routed to the PEC DSPs to support internal Business
Communications Manager functions such as voice mail, VoIP trunks, and IP telephony functions.
This configuration is called a 2/6 DS30 split.
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Troubleshooting
