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94 Chapter 4 Selecting the media bay modules for your system
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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.
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 channel, 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 channel
requirements of each module.
The following sections describe these channels and how you fit your modules into the overall
system planning.
Understanding DS30 channel numbers
A DS30 channel is a block of virtual pathways on the media services card (MSC).
On a default system, six DS30 channel blocks can be assigned to media bay modules. Which block
the module is assigned to 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 other
two 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 channel split.
You can change the DS30 channel allocation to a 3/5 split to accommodate increased IP telephony
or VoIP trunk requirements. You do this by assigning DS30 Channel 7 to the voice data sector.
This choice should be made at system startup, but a default system can be changed through the
Unified Manager to a 3/5 split after startup if IP requirements increase. At startup, you indicate the
split you want when you run the Quick Start Wizard. Refer to the Programming Operations Guide
for details.
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.