Troubleshooting The T640 Sonet Clock Generators - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
Solution
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Troubleshooting the T640 SONET Clock Generators

Problem
468
To troubleshoot the T640 craft interface:
Check the LEDs on the craft interface.
1.
Use the CLI to check for alarms.
2.
Standalone T640 router—Issue the
alarms.
T640 router in a routing matrix—Issue the
command to view the alarms.
T640 Craft Interface Description on page 22
Description:
The following alarms and LEDs indicate a problem with an SCG:
The yellow LED on the SCG faceplate is lit.
FAIL
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
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
show chassis alarms
show chassis alarms lcc lcc-number
A or B port.
command.
command to view the
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