Nortel Networks BCM200 BCM400 advanced function tray, Component Description Front view, Rear view

	Chapter 2 Introducing the BCM hardware 37
Table 4 BCM400 main unit internal component descriptions (standard and RFO configurations)
Component	Description
Front view
Removable cover	The removable cover provides access to internal components.
Power supply	Standard: The auto-sensing power supply (standard) provides power to the main unit
	(see “BCM power supply” on page 63).
	RFO: The two redundant, hot-swappable power supply modules provide power to the
	main unit (see “BCM power supply” on page 63).
Cooling fan	Standard: The system cooling fan forces warm air out of the main unit (see “Cooling
	fan” on page 68).
	RFO: The two system cooling fans force warm air out of the main unit (see “Cooling
	fan” on page 68).
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).
Rack-mount bracket	The rack-mount bracket is required to install the main unit in an equipment rack.
Hard disk and RAID	The two hard disks and RAID controller card.
Rear view
MBM backplane connector	The MBM backplane connector connects to the MSC and power supply.
Fan access panel	The fan access panel provides access to the fans for maintenance purposes.
Fan exhausts	The fan exhausts allow the fans to move warm air outside the main unit.
Power supply support bracket	The power supply support bracket stabilizes the power supply when mounted in the
mount	main unit.

BCM400 advanced function tray

The advanced function tray houses the hard disk assembly and an extra, unpopulated bay. The standard configuration contains a single hard disk and has no redundant array of independent disks (RAID) LED display.

The advanced function tray in the RFO configuration contains two hard disks and a RAID controller card, and has an LED display to monitor RAID status. The extra, unpopulated bay is reserved for future development. The advanced function tray mounts in the upper BCM400 main unit bay. The advanced function tray slides out and away from the front of the main unit for hard disk maintenance, RAID upgrade, or exchange purposes.

Figure 6 illustrates the advanced function tray and faceplate interfaces for the BCM400 standard and RFO configurations.

BCM200/400 4.0 Installation and Maintenance Guide