Nortel Networks 400 4.0 User Manual
50
Chapter 2 Introducing the BCM hardware
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Figure 21 BCM expansion unit connected to BCM400 main unit
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.
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
MBM bay openings in the main unit with the MBM filler blanking plates (see
).
Figure 22 MBM filler blanking plate
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.
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.
BCM expansion unit
NEEd
DS256 port
BCM400 main unit
DS256 port
Filler blanking plate
face
face
Locking clip