Nortel Networks 400 4.0 BCM400 expansion gateway MBMs, BCM400 expansion gateway configuration

134Chapter 8 Installing a media bay module (MBM)

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.

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 72 on page 134 and Figure 73 on page 135 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

Example 1 System needs:

16 analog trunks

32 analog phones

128 digital phones

10 IP Phones

Example 2 System needs:

32 analog phones

160 digital phones

10 IP Phones

DSM32	DTM
DSM32	DTM
DSM32
DSM32

ASM8	ASM8	BCM400 expansion gateway
ASM8	CTM8
ASM8	CTM8

BCM400 main unit and expansion unit

	DSM32	DTM
	DSM32	DTM
	DSM32
	DSM32
DSM32	ASM8	BCM400 expansion gateway
ASM8	ASM8
ASM8
BCM400 main unit
and expansion unit

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