Nortel Networks 400 4.0 MBM bays and backplane, BCM expansion unit connected to BCM400 main unit

50Chapter 2 Introducing the BCM hardware

Figure 21 BCM expansion unit connected to BCM400 main unit

BCM400 main unit

DS256 port

BCM expansion unit

NEEd

DS256 port

MBM bays and backplane

The number and configuration of the MBMs depend on the number of bays available in the main unit and DS30 system resources. The BCM200 main unit provides two MBM bays. The BCM400 main unit provides four MBM bays.

All MBM bays must contain either an MBM or an MBM filler blanking plate. Fill unpopulated MBM bay openings in the main unit with the MBM filler blanking plates (see Figure 22).

Figure 22 MBM filler blanking plate

Filler blanking plate face

Locking clip

The MBMs slide into the MBM bays and lock into place. Pull on the MBM ejector to release the MBM or filler blanking plate. The MBM or filler blanking plate partially ejects from the bay. Slide the MBM out of the bay to remove it from the main unit.

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