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Chapter 27
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 on page 360
Checking the MCS Status on page 362
1. Check the MCS Environmental Status on page 362 show chassis environment mcs
2. Check the MCS Status from the Craft Interface on page 363 show chassis craft-interface
3. Check the MCS LEDs on page 364 Check the LEDs on the MCS faceplate.
Verifying MCS Failure on page 365
1. Check the MCS Fuses on page 365 The M40e and M160 router fuses are located in a fuse box at
the rear of the midplane, behind the lower rear impeller
assembly.
2. Perform an MCS Swap Test on page 366 Remove the MCS and replace it with one that you know
works.
Getting MCS Hardware Information on page 367
1. Display the MCS Hardware Information on page 367
show chassis hardware
2. Locate the MCS Serial Number ID Label on page 368 Look at the bottom left of the MCS board.
Returning the MCS on page 368
See “Return the Failed Component” on page 86, or follow the
procedure in the M40e or M160 router hardware guide.
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