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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 2 Alarm Troubleshooting
2.7.150 LOS (OCN)
Warning
Use of controls, adjustments, or performing procedures other than those specified could result in
hazardous radiation exposure.
Statement 1057
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 (OCN) Alarm
Step 1 Using site practices, verify fiber continuity to the port.
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 green ACT LED is on.
b. To determine whether the OC-3 or OC-12 port is in service, double-click the controller card
(15310-CL-CTX or CTX2500 card) in CTC to display the card view.
c. Click the Provisioning > Optical > 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, clean the fiber according to site practice. If no site practice exists,
complete the procedure in the “Maintain the Node” chapter in the Cisco ONS 15310-CL and
Cisco ONS 15310-MA Procedure Guide.
Step 4 If the alarm does not clear, verify that the power level of the optical signal is within the OC-3 or OC-12
port receiver specifications. The “Install Hardware” chapter in the Cisco ONS 15310-CL and
Cisco ONS 15310-MA Procedure Guide lists these specifications for each OC-N port.
Step 5 If the optical power level is within specifications, use an optical test set to verify 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 card as possible.
Step 6 Repeat Steps 1 to 5 for any other port on the card reporting the LOS (OC-N).
Step 7 If the alarm does not clear, look for and troubleshoot any other alarm that could identify the source of
the problem.