Allied Telesis AT-CV5001 - Manual (Page 21)

AT-CV5001 Media Converter Chassis Installation Guide
21
AT-CV5001AC and AT-CV5001DC Power Supply Modules
The AT-CV5001 Chassis has slots for two power supply modules. The
power requirements of the chassis and the media converter line cards can
be met with just one power supply. A second power supply can be added
for power redundancy.
If the chassis has two power modules, the modules use a load-sharing
arrangement in which they both supply power to the media converter line
cards. If one of the power supply fails, the second module automatically
assumes the role of powering the entire chassis, thus preventing any
interruption to the flow of network traffic through the line cards.
There are AC and DC power modules for the chassis. They are:
 AT-CV5001AC Power Supply Module
 AT-CV5001DC Power Supply Module
The chassis can have either AC or DC modules, or both AC and DC
modules.
The previous AT-CV5000 Chassis had left and right power supply
modules. This is not true for the power modules for the AT-CV5001
Chassis. The AT-CV5001AC and AT-CV5001DC Power Supply Modules
can be installed in either slot A or slot B in the chassis.
The chassis does not come with a power supply module. Power supply
modules must be ordered separately.
Automatic Fan
Speed Control
Each power supply module has a single cooling fan that draws air out of
the chassis. Air enters the device from the front through the air vents on
the faceplates on the slot covers and the media converter cards.
If the chassis has the AT-CV5M02 Management Module, the speed of the
fan is automatically adjusted according to the internal temperature of the
unit. When operating conditions permit, the speed of the fan is lowered to
lessen fan noise, reducing the chance that the unit will be an annoyance to
individuals if the device is installed in a public or work area.
The feature works by monitoring the internal temperature of the chassis. If
the temperature is below 60° C (140° F), the management card
incrementally reduces the speed of the fan over approximately 30 seconds
to a minimum speed of 2000 RPM. If the temperature exceeds 60° C, the
management card incrementally increases the fan speed over the same
time period to approximately 6000 RPM. When the temperature returns
below 60° C, the fan speed is again incrementally reduced to 2000 RPM.