Fan Trays; Replace A Fan Tray - Juniper G10 CMTS Hardware Manual

Fan Trays

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Replace a Fan Tray

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162 JUNOSg 3.0 G10 CMTS Hardware Guide
To maintain an internal temperature below the maximum operating temperature of the G10
CMTS, all fan trays must be fully functional. If any of the fan trays fails, you must replace it as
soon as possible to ensure the CMTS remains operational.
You can detect a fan tray failure by any of following indicators:
! A fan tray LED is illuminated red.
! If enabled, an entry was written the local event log.
! If enabled, an SNMP message was sent to the NMS indicating a fan failure.
! The display produced by issuing the show chassis environment command shows a fan
speed of 0 RPM.
! If enabled, an SNMP message was sent to the NMS indicating the temperature of the
CMTS exceeded the temperature high threshold. This might also indicate the ambient
temperature is rising.
If a fan tray LED is illuminated red, one or more fans in that tray has failed and you must
replace the fan tray. The fan trays are hot-swappable, which means you can remove and
install them while the system is powered on.
If a fan tray fails to the point where inadequate air ventilation flows through the chassis, the
Chassis Control Module might power down the system if the temperature within the chassis
exceeds the threshold considered safe for system operation.
! All fans within a fan tray contain top and bottom grills
to provide protection during removal and installation.
Nevertheless, take care when inserting your hand
anywhere in the vicinity of an operating fan.
! Operating the G10 CMTS without fully functional fan
trays might cause irreparable damage or reduce the
life of one or more modules in the system. After
removing a fan tray, you must immediately install its
replacement.