Cisco ONS 15454 Troubleshooting Manual page 354

2.7.219 LOS (DS3)
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 (DS3) Alarm
Check for any upstream failures in the transmitting equipment.
Step 1
Verify that the cable is properly connected from the transmitting port and attached to the correct
Step 2
receiving port at the node with the LOS. For more information about fiber connections and terminations,
refer to the "Install Cards and Fiber-Optic Cable" chapter in the Cisco ONS 15454 Procedure Guide.
Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Caution
Plug the wristband cable into the ESD jack located on the lower-right edge of the shelf assembly.
Step 3 Clean the cable ends using site practices or, if none exists, complete the procedure in the "Maintain the
Node" chapter in the Cisco ONS 15454 Procedure Guide.
Consult site records to determine whether the port raising the alarm has been assigned.
Step 4
If the port is not currently assigned, place the port out of service using the following steps:
Step 5
a.
b.
c.
d.
If the port is assigned, verify that the correct one is in service:
Step 6
a.
b.
Step 7 Use a test set to confirm that a valid signal exists on the line. Test the line as close to the receiving card
as possible. (For specific procedures to use the test set equipment, consult the manufacturer.)
Step 8 Ensure that the transmit and receive outputs from the DSx patch panel to your equipment are properly
connected. For more information about cable connections and terminations, refer to the "Install Cards
and Fiber-Optic Cable" chapter in the Cisco ONS 15454 Procedure Guide.
If there is a valid signal but the alarm does not clear, replace the electrical connector on the ONS 15454.
Step 9
Cisco ONS 15454 Troubleshooting Guide, R8.5
2-160
Double-click the card to open the card view.
Click the Maintenance > DS3 tabs.
Under Admin State, click OOS,DSBLD.
Click Apply.
To confirm this physically, 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 this virtually, double-click the card in CTC to open the card view and complete the
following substeps:
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.
If ports managed into IS admin state are not receiving signals, the LOS alarm is either
Note
raised or remains, and the port service state transitions to OOS-AU,FLT.
Chapter 2 Alarm Troubleshooting
November 2009