Chassis (Mainframe)
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Cooling is provided by six fans in the AV4 BSMS Fan Tray inserted on the top. For more
information about the fan tray see Fan Tray [} 43]. For details about the proper chassis
configuration please refer to Rack Configurations [}30].
5.2.1 Power On/Off
The BSMS Chassis has no power On/Off switch!
The AV4 BSMS Chassis has neither a mains power inlet nor a mains distribution.
The mains power is routed via the Power Distribution Unit (PDU) of the cabinet directly to
each AC/DC power supply module of the chassis. The PDU controls the power-up/down
cycle of the individual PSMs and thus the chassis.
No operation without Fan Tray!
The chassis power supply does not power up if no fan tray is present. It automatically turns of
(without warning) when the fan tray is removed during operation.
5.2.2 Backplane Functions
The backplane (user bus) incorporates various functions:
• Power supply distribution
• SSRB distribution and termination
• I
2
C bus distribution
• Slot ID
• Auxiliary control signal and pulse distribution
There are no active components placed on the backplane. The only exception is a non-
volatile memory for system identification (BIS).
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General