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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 2 Alarm Troubleshooting
2.7.149 LOS (FUDC)
Note If a circuit shows a partial status when this alarm is raised, the logical circuit is in place. The circuit is
able to carry traffic when the connection issue is resolved. You do not need to delete the circuit when
troubleshooting this alarm.
Clear the LOS (EC1) Alarm
Step 1 Using site practice, verify cabling continuity to the port reporting the alarm.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15310-CL
or ONS 15310-MA.
Step 2 If the cabling is good, verify that the correct port is in service by completing the following steps:
a. Confirm that the ACT LED is green.
b. To determine whether the port is in service, double-click the card in CTC to display the card view.
c. Click the Provisioning > EC1 > Line tabs.
d. Verify that the Admin State column lists the port as IS.
e. If the Admin State column lists the port as OOS,MT or OOS,DSBLD, click the column and choose
IS. Click Apply.
Note If ports managed into IS administrative state are not receiving signals, the LOS alarm is
either raised or remains, and the port service state transitions to OOS-AU,FLT.
Step 3 If the correct port is in service, use an optical test set to confirm that a valid signal exists on the line. For
specific procedures to use the test set equipment, consult the manufacturer. Test the line as close to the
receiving port as possible.
Step 4 If the signal is valid, ensure that the transmit and receive outputs from the DSx panel to your equipment
are properly connected. For more information about fiber connections and terminations, refer to the
“Install Hardware” chapter in the Cisco ONS 15310-CL and Cisco ONS 15310-MA Procedure Guide.
Step 5 Repeat Steps 1 through 4 for any other port on the card that reports the LOS (EC1).
Step 6 If the alarm does not clear, look for and troubleshoot any other alarm that could identify the source of
the problem.
Step 7 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.
2.7.149 LOS (FUDC)
Default Severity: Minor (MN), Non-Service-Affecting (NSA)
SONET Logical Object: FUDC