Troubleshooting The Mx2010 Cooling System - Juniper MX2010 Hardware Manual

Control Board and Routing Engine (CB-RE) LEDs—For the Control Board portion of the CB-RE, there is
a set of bicolor LEDs, labeled OK/FAIL, LINK, ExtClk-0, ExtClk-1, BITS, and GPS. For the Routing Engine
portion of the CB-RE, there are three LEDs, labeled ONLINE, MASTER, and OK/FAIL. These LEDs on
the faceplate indicate the status of the CB-RE.
NOTE: Even though the Control Board and Routing Engine (CB-RE) are combined into one
unit; the LED functionality is separate for the Control Board and Routing Engine.
AC delta or wye PDM LEDs—One LED for each input terminal block indicating the input feed status.
DC PDM LEDs—One LED on each PDM next to each of the nine –48VDC power feeds indicates the
status of that PDM's incoming power.
AC or DC PSM LEDs—Four LEDs, labeled PWR OK, FAULT, INP0, and INP1, on each PSM faceplate
indicate the status of that PSM.
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Troubleshooting the MX2010 Cooling System
Problem
Description: The following alarms, LEDs, and other conditions indicate a problem with the cooling system:
A red alarm indicates that temperature of the router exceeds the maximum ("temperature hot") threshold.
Automatic shutdown of the power system was caused by the temperature of the router exceeding the
maximum ("temperature hot") threshold.
A red alarm indicates that a fan failed.
A yellow alarm indicates that the router temperature exceeds the "temperature warm" threshold.
A yellow alarm indicates that one of the fan trays was removed.
One or more fans in a fan tray function at full speed. The CB-RE constantly monitors the temperatures
detected by sensors on the midplane and router components, adjusting the speed of the fans as necessary.
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