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Chapter 23
Monitoring the SCGs
You monitor the SONET Clock Generators (SCGs) that provide a clock signal for the
SONET/SDH interfaces on the T320 router and the T640 routing node. The SCGs
select a clock signal from any Flexible PIC Concentrator (FPC). (See Table 75.)
Table 75: Checklist for Monitoring the SCG
Monitor SCG Tasks Command or Action
Understanding the SCG on page 316
Monitoring the SCG Status on page 317
1. Monitor the SCG Environmental Status on page 317 show chassis environment
show chassis environment scg
2. Display the SCG LED States at the Command Line on
page 318
show chassis craft-interface
3. Look at the SCG LEDs on the Faceplate on page 319
Determining SCG Mastership on page 319
1. Display the SCG Master from the Craft Interface Output on
page 319
show chassis craft-interface
2. Look at the SCG LEDs on the Faceplate on page 320
Displaying SCG Alarms on page 320
1. Display Current SCG Alarms on page 320 show chassis alarms
2. Display SCG Error Messages in the System Log File on
page 321
show log messages
3. Display SCG Error Messages in the Chassis Daemon Log File
on page 321
show log chassisd
Verifying SCG Failure on page 322
1. Check the SCG Connection on page 322 1. Make sure the SCG is properly seated in the midplane.
2. Make sure none of the SCG pins are bent.
3. Check the thumbscrew on the right side of the SCG.
2. Perform an SCG Swap Test on page 322 1. Take the SCG offline.
2. Replace the SCG with one that you know works.
3. Bring the SCG online.
4. Check the SCG status.
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