Cisco ONS 15454 Troubleshooting Manual page 359

Chapter 2 Alarm Troubleshooting
Warning Invisible laser radiation could be emitted from the end of the unterminated fiber cable or connector.
Do not stare into the beam directly with optical instruments. Viewing the laser output with certain
optical instruments (for example, eye loupes, magnifiers, and microscopes) within a distance of
100 mm could pose an eye hazard. Statement 1056
Warning Use of controls, adjustments, or performing procedures other than those specified could result in
hazardous radiation exposure. Statement 1057
If a circuit shows a partial status when this alarm is raised, the logical circuit is in place. The circuit is
Note
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
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Plug the wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
Using site practices, verify fiber continuity to the port.
Step 1
Step 2 If the cabling is good, verify that the correct port is in service:
a.
b.
c.
d.
e.
f.
If the correct port is in service, clean the fiber according to site practice. If no site practice exists,
Step 3
complete the procedure in the "Maintain the Node" chapter of the Cisco ONS 15454 Procedure Guide.
If the alarm does not clear, verify that the power level of the optical signal is within the OC-N card
Step 4
receiver specifications. The
lists these specifications for each OC-N card. For DWDM cards, refer to the Cisco ONS 15454 DWDM
Reference Manual for levels.
November 2009
Confirm that the LED is correctly illuminated on the physical card.
A green ACT/SBY LED indicates an active card. An amber ACT/SBY LED indicates a standby card.
To determine whether the OC-N port is in service, double-click the card in CTC to open the card
view.
Click the Provisioning > Line tabs.
Verify that the Admin State column lists the port as IS.
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 admin state are not receiving signals, the LOS alarm is either raised
or remains, and the port service state transitions to OOS-AU,FLT.
"1.12.3 OC-N Card Transmit and Receive Levels" section on page 1-146
Cisco ONS 15454 Troubleshooting Guide, R8.5
2.7.226 LOS (OCN)
2-165