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Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 2 Alarm Troubleshooting
2.6.125 LO-TXPOWER
Step 8
If the alarm does not clear, look for and troubleshoot any other alarm that could identify the source of
the problem.
Step 9
If no other alarms exist that could be the source of the LOS, or if clearing an alarm did not clear the LOS,
complete the
“Replace an I/O Card” procedure on page 2-134
for the reporting card.
Caution
Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
perform an external switch if a switch has not already occurred. See the
Lock Initiation, and Clearing” section on page 2-123
for commonly used traffic-switching procedures.
Note
When you replace a card with the identical type of card, you do not need to make any changes
to the database.
Step 10
If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/techsupport
for more information or call Cisco TAC (1 800 553-2447) in order to report a Service-Affecting (SA)
problem.
2.6.125 LO-TXPOWER
For information about this condition, refer to the “Alarm Troubleshooting” chapter of the
Cisco ONS 15454 DWDM Troubleshooting Guide
.
2.6.126 LPBKCRS
Default Severity: Not Alarmed (NA), Service-Affecting (SA)
Logical Object: VCMON-HP
The Loopback Cross-Connect condition indicates that a software cross-connect loopback is active
between a traffic (STM-N) card and a cross-connect card.
Loopback is a commonly used troubleshooting technique. A signal is sent out on a link or section of the
network and returned to the sending device. If the signal does not return or returns with errors, the test
confirms that the problem is present in the tested link. By setting up loopbacks on various parts of the
node and excluding other parts, you can logically isolate the source of the problem. For more information
about loopbacks, see the “Troubleshooting Optical Circuits with Loopbacks” procedure in Chapter 1.
Four types of loopbacks are available: Cross-Connect, Facility, Terminal, and Payload. Cross-connect
loopbacks troubleshoot any kind of VC (meaning there must be a cross connect) on any card type.
Facility loopbacks troubleshoot STM-16-16 and ASAP ports only and are generally performed locally
or at the near end. Payload loopbacks troubleshoot STM-64-4 ports only and are generally performed
locally or at the near end. Terminal loopbacks are performed only on the ASAP card.
Clear the LBKCRS Condition
Step 1
To remove the loopback cross-connect condition, double-click the traffic (STM-N) card in node view.
Step 2
Click the
Provisioning > VC3
or
VC4
tabs.
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