Nortel Networks 400 4.0 Benutzerhandbuch

Chapter 8 Installing a media bay module (MBM)

N0060612

N0060612

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

 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 72   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.

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

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

BCM400 main unit 
and expansion unit

BCM400 expansion gateway