Nortel Networks 400 4.0 manual BCM200 main unit internal components

Chapter 2 Introducing the BCM hardware 33

Figure 2 BCM200 main unit internal components

Front view	Fan	Removable cover
	Hard disk
	I/O card
		Power supply
		MBM backplane
Rear view	MBM backplane
	connectors
	Power supply bay
	Fan exhaust
	Hard disk bay (removable panel)	Rack-mount adapter
		anchor points

Table 2 BCM200 main unit internal component descriptions

Component	Description
Hard disk	The programmed hard disk (or field redundancy upgrade) provides an additional hard
	disk and redundant array of independent disks (RAID) controller card. See “Hard disk”
	on page 66.
Power supply	The auto-sensing power supply (standard) provides power to the main unit (see “BCM
	power supply” on page 63).
Cooling fan	The system cooling fan forces warm air out of the main unit (see “Cooling fan” on
	page 68).
I/O card	The I/O interface card provides a signal junction between the base function tray, hard
	disk, power supply, and cooling system (see “I/O interface card” on page 48).
MBM backplane	The MBM backplane provides the MBM component interface to the power supply and
	main card (see “MBM bays and backplane” on page 50).
Removable cover	The removable cover provides access to internal components.

BCM200/400 4.0 Installation and Maintenance Guide