Table 105: Checklist For Monitoring The Scg; Scg Overview - Juniper M Series Monitoring And Troubleshooting Manual

M Series and T Series Routers Monitoring and Troubleshooting Guide
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SCG Overview

402
Table 105: Checklist for Monitoring the SCG (continued)
Monitor SCG Tasks
"Display SCG Alarms" on page 407
1. Display Current SCG Alarms on page 407
2. Display SCG Error Messages in the System
Log File on page 407
3. Display SCG Error Messages in the Chassis
Daemon Log File on page 408
"Verify SCG Failure" on page 408
1. Check the SCG Connection on page 409
2. Perform an SCG Swap Test on page 409
"Get SCG Hardware Information" on page 410
1. Display the SCG Hardware Information on
page 410
2. Locate the SCG Serial Number ID Label on
page 410
"Return the SCG" on page 411
SCG Overview on page 402
You monitor the SCGs to ensure that they provide a clock signal for the SONET/SDH
interfaces on the router and that they select a clock signal from any FPC, or from the
external clock inputs.
The SCGs provide a 19.44-MHz Stratum 3 clock signal for the SONET/SDH interfaces on
the router. The SCGs can also select a clock signal from any FPC, or from the external
clock inputs (see Figure 222 on page
Command or Action
show chassis alarms
show log messages
show log chassisd
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.
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.
show chassis hardware
Look on the top of the SCG, close to the midplane
connector.
See "Return the Failed Component" on page
or follow the procedure in the appropriate router
hardware guide.
403).
Copyright © 2012, Juniper Networks, Inc.
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