Chapter 5: C4c CMTS Installation Requirements
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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the temperature continues to rise to the module’s thermal limit, the card is powered down and a card
TempOverHeatNotification SNMP trap is generated.
The temperature value read during the last 90-second poll is accessible via both the CLI and SNMP. The
show
environment
CLI command will display the current temperature of modules in equipped slots. The card Temperature
object in the cardTable table in the cadEquipmentMib MIB module contains the current temperature of the associated
slot.
As shown in figure below, the Fan Tray Module circulates the air that cools the chassis. Air is drawn in through the intake
vent on the right side of the chassis (when facing the front) and moves across the internal components, cooling them as it
passes. The warm air is exhausted through the vents on the left side of the chassis.
To ensure the proper air flow, make sure filler panels are installed in unoccupied chassis slots. It is also important to
change the fan filter at least every three months, and more often if the air at the site is dusty.
CAUTION: Fan filters cannot be cleaned and re-used.
CAUTION: Due to the heat generated by the C4c CMTS, it is critical that preparations are made in advance to change the
fan filter. The fan filter replacement must be completed within a 60-second window or damage may occur to the chassis
and/or the boards.
Note: The diamond-shaped mesh side of the air filter should face toward the modules and away from the fans.