Solution To troubleshoot the T640 craft interface:
1. Check the LEDs on the craft interface.
2. Use the CLI to check for alarms.
• Standalone T640 router—Issue the show chassis alarms command to view the
alarms.
• T640 router in a routing matrix—Issue the show chassis alarms lcc lcc-number
command to view the alarms.
Related
Documentation
T640 Craft Interface Description on page 22•
Troubleshooting the T640 SONET Clock Generators
Problem Description:
The following alarms and LEDs indicate a problem with an SCG:
• The yellow FAIL LED on the SCG faceplate is lit.
• The green OK LED on the SCG faceplate is not lit.
• A red alarm indicates that an SCG, SCG voltage sensor, or the internal clock has failed.
• A red alarm indicates that there are no SCGs online.
• A red alarm indicates that loss of signal has occurred from an external clocking device
connected to the RJ-48 Aor B port.
• A yellow alarm indicates that an SCG is not online in a router with redundant SCGs or
that an SCG has been removed..
• A yellow alarm indicates that a temperature sensor has failed.
In Table 94 on page 469, the text in the column labeled ”LCD Message” appears in the
display of the craft interface. The text in the column labeled “CLI Message” appears in
the output from the show chassis alarms command.
Copyright © 2017, Juniper Networks, Inc.468
T640 Core Router Hardware Guide
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