Monitoring Power Supplies

You monitor and maintain the power supplies to ensure that power is distributed to the router components. (See Table 53.)

Table 53: Checklist for Monitoring Power Supplies

Monitor Power Supply Tasks	Command or Action
Understanding Power Supplies M5/M10 Router Power Supplies M7i Router Power Supplies M10i Router Power Supplies M20 Router Power Supplies M40 Router Power Supplies M40e Router Power Supplies M160 Router Power Supplies M320 Router Power Supplies T320 Router Power Supplies T640 Routing Node Power Supplies
Checking the Power Supply Cables	Check the power supply cables.
Checking the Power Supply Status
Check the Power Supply Environmental Status	show chassis environment (M40e, M160, and T320 router and T640 routing node only) show chassis environment pem slot
Check the Power Supply LEDs	Check the LEDs on the power supply faceplate.
Checking for Power Supply Alarms
Display Current Power Supply Alarms	show chassis alarms
Display Power Supply Error Messages in the System Log File	show log messages | match "power supply"
Display Power Supply Error Messages in the Chassis Daemon Log File	show log chassisd | match pem
Verifying Power Supply Failure
Check the Power Supply Power Switch	Check the power supply power switch.
Check the Circuit Breaker	Make sure that the power switch is on.
Perform a Power Supply Swap Test	Replace the faulty power supply with one that works.
Check the Router Cooling System	show chassis environment
Test the Power Supply	Press the power supply self-test button.
Getting Power Supply Hardware Information
Display the Power Supply Hardware Information	show chassis hardware
Locate the Power Supply Serial Number ID Label	Look on the power supply faceplate or look on the back of the power supply.
Replacing the Power Supplies	(M5, M10, M20, and M40 routers) Turn off the power to the individual power supply before removing it from the chassis. (M40e, M160, and T320 routers and T640 routing node) Switch the corresponding circuit breaker off before removing the power supply. Follow the procedure in the appropriate router hardware guide.