Monitoring the MCS

You monitor and maintain the Miscellaneous Control Subsystem (MCS) to provide control and monitoring functions for router components and to provide SONET/SDH clocking for the M40e and M160 routers. (See Table 86.)

Table 86: Checklist for Monitoring the MCS

Monitor MCS Tasks	Command or Action
Understanding the MCS
Checking the MCS Status
Check the MCS Environmental Status	show chassis environment mcs
Check the MCS Status from the Craft Interface	show chassis craft-interface
Check the MCS LEDs	Check the LEDs on the MCS faceplate.
Verifying MCS Failure
Check the MCS Fuses	The M40e and M160 router fuses are located in a fuse box at the rear of the midplane, behind the lower rear impeller assembly.
Perform an MCS Swap Test	Remove the MCS and replace it with one that you know works.
Getting MCS Hardware Information
Display the MCS Hardware Information	show chassis hardware
Locate the MCS Serial Number ID Label	Look at the bottom left of the MCS board.
Returning the MCS	See Return the Failed Component, or follow the procedure in the M40e or M160 router hardware guide.