Installation guide

Cuda 12000 IP Access Switch Installation Guide
System Overview 17
Backplane Connections
Each module slides into a chassis slot and connects directly to the backplane,
where each gains connection to a redundant 100 Mbps management BUS, a
high-speed serial mesh, redundant power BUSes, and various other
components. The management BUS consists of dual 100 Mbps management
channels over which the system Management modules and the application
modules communicate.
The Cooling System
The cooling system for the Cuda 12000 is comprised of a fan tray
augmented by plenums. The fan tray is comprised of three hot-swappable
fan modules. Each fan module within the assembly consists of two five-inch
fans. These six fans provide system cooling for a single chassis.
A fan tray is rack-mounted beneath each chassis in the rack and is designed
to utilize plenums to ensure adequate air flow through the system. A plenum
rack-mounted directly beneath each fan tray serves as the intake plenum to
ensure adequate airflow into the system. Another plenum mounted above
the chassis serves as the exhaust plenum to ensure proper airflow out of the
system.
Each fan module in the assembly includes an LED on the front panel to
indicate status. Green illumination indicates normal operation. If a fan
should stop rotating or begin rotating too slowly, the LED illuminates red to
indicate failure. In the event of a failure, the affected fan module can be
replaced without interruption to the remaining units. A temperature sensor
within the unit monitors the inlet airflow to ensure that the incoming air
stream is not too warm. If the temperature of the incoming air stream
exceeds acceptable limits, all three LEDs on the front of the fan tray
illuminate red.
Power redundancy provides for two -48 VDC power connectors on the rear
of the fan tray unit. Each fan module within the unit connects directly to a
backplane where it gains connection to two DC voltage distribution
channels.