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Chapter 41
Monitoring Redundant SCGs
You monitor and maintain redundant SONET Clock Generators (SCGs) installed in
the T320 router and the T640 routing node to ensure that there is no interruption of
function. SCGs provide a clock signal for SONET/SDH, and select a clock signal from
any Flexible PIC Concentrator (FPC), or from the external clock inputs.
Table 117 lists the tasks you perform to monitor redundant SCGs.
Table 117: Checklist for Monitoring the Redundant SCG
Monitor SCG Tasks Command or Action
Understanding Redundant SCGs on page 552
Displaying Redundant SCG Hardware Information on
page 553
show chassis hardware
Monitoring Redundant SCG Status on page 553
1. Monitor the Redundant SCG Environmental Status on
page 553
show chassis environment
show chassis environment scg
2. Display the Redundant SCG LED States at the Command
Line on page 555
show chassis craft-interface
3. View the Redundant SCG LEDs on page 555 Remove the rear component cover and look on the SCG
faceplate at the back of the T320 router or T640 routing node
chassis.
Displaying Redundant SCG Mastership on page 555
1. Display the SCG Master and Standby from the Craft
Interface Output on page 556
show chassis craft-interface
2. View the SCG LEDs on page 556 Remove the rear component cover and look on the SCG
faceplate at the rear of the T320 router or T640 routing node
chassis.
Performing a Swap Test on a Redundant SCG on
page 556
1. Take the SCG offline.
request chassis scg offline slot number
2. Replace the SCG with one that you know works.
3. Bring the SCG online.
request chassis scg offline slot number
4. Verify the SCG status.
request chassis scg offline slot number
Returning the SCG on page 557
See “Return the Failed Component” on page 86, or follow the
procedure in the M40e or M160 router hardware guide.
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