Bcm400 expansion gateway mbms – Nortel Networks BCM200/400 User Manual

Page 141

Chapter 8 Installing a media bay module (MBM)

141

BCM200/400 4.0 Installation and Maintenance Guide

BCM400 expansion gateway MBMs

MBMs are installed in the BCM400 expansion gateway in the same manner as in the BCM400
main unit. Refer to

Figure 73 on page 141

and

Figure 74 on page 142

for sample MBM layouts

using the expansion gateway.

The following rules apply when using a BCM400 expansion gateway:

•

All stations must be on the host unit.

•

Primary rate interface (PRI) PSTN trunking interfaces must be on the expansion gateway.

If analog modems are deployed as part of the overall customer configuration and intended to share
PSTN network access with the normal voice trunks, then an exception to the above rules is
required. In this case, analog stations (for example, ASM8+, GASM8, or even ATAs connected to
a DSM16/32) must be configured in the expansion gateway to support the modem connections
only. Fax machines or other analog telephones must be connected to MBMs on the host system.

Figure 73 BCM400 expansion gateway configuration

Warning: Do not attempt to turn on ports requiring a DS30 bus that is already in service
to another media bay module located on the same BCM system. Doing this results in
unpredictable behavior with both modules.

DSM32

DTM

ASM8
CTM8
CTM8

ASM8

ASM8
ASM8

Example 1
System needs:
16 analog trunks
32 analog phones
128 digital phones
10 IP Phones

BCM400 main unit
and expansion unit

BCM400 expansion gateway

DSM32

DTM

ASM8
ASM8

DSM32
ASM8
ASM8

Example 2
System needs:
32 analog phones
160 digital phones
10 IP Phones

BCM400 main unit
and expansion unit

BCM400 expansion gateway