Nortel Networks BCM200/400 - Manual (Page 39)

Chapter 2 Introducing the BCM hardware 39
BCM200/400 4.0 Installation and Maintenance Guide
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.
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 66 ).
RFO: The two redundant, hot-swappable power supply modules provide power to the
main unit (see
“BCM power supply” on page 66 ).
Cooling fan Standard: The system cooling fan forces warm air out of the main unit (see “Cooling
fan” on page 71 ).
RFO: The two system cooling fans force warm air out of the main unit (see “Cooling
fan” on page 71 ).
MBM backplane The MBM backplane provides the MBM component interface to the power supply and
main card (see
“MBM bays and backplane” on page 52 ).
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
mount The power supply support bracket stabilizes the power supply when mounted in the
main unit.