Nortel Networks 400 4.0 User Manual

Chapter 8 Installing a media bay module (MBM)

BCM200/400 4.0 Installation and Maintenance Guide

Figure 73   BCM400 expansion gateway configuration

After you set the switches on the MBMs, you can install them in the BCM main unit or the 
expansion unit.

The BCM200 main unit accommodates a maximum of two MBMs. The BCM400 main unit 
accommodates a maximum of four MBMs. If your BCM400 system requires more than four 
MBMs, you must connect an expansion unit to the BCM main unit.

Warning: Ensure you are properly grounded before handling modules or any 
components that are part of the BCM hardware.

Warning: Install DTMs in the BCM main unit only. DTMs do not function if 
installed in the BCM expansion unit. 
If there are no empty MBM bays in the BCM main unit, move MBMs to the 
expansion unit to provide space for the DTMs.

Note: The number of MBMs you can add varies, depending on the DS30 
resources that are available. Refer to 

Example 3
System needs:
16 analog trunks
160 digital phones
10 IP Phones
48 digital trunks

BCM400 main unit 
and expansion unit

BCM400 expansion gateway

Example 4
System needs:
192 digital phones
10 IP Phones
48 digital trunks

BCM400 main unit 
and expansion unit

BCM400 expansion gateway