Juniper Networks G10 CMTS manual Fan Trays, Replace a Fan Tray

Fan Trays

•Fan Trays

•
•	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.
•
•

•Replace a Fan Tray

•
•	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.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

162 JUNOSg 3.0 G10 CMTS Hardware Guide