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Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
78-18663-01
Chapter 2 Alarm Troubleshooting
Alarm Procedures
Note When the ONS 15310-MA raises an LOF (E1) or LOS (E1) alarm, a path protection switch will occur,
but a PDI-P alarm will not be generated due to hardware limitations.
Clear the LOS (E1) Alarm
Step 1 Verify that the cable is properly connected and attached to the correct port. For more information about
cable connections and terminations, refer to the “Install Hardware” chapter in the Cisco ONS15310-MA
SDH Procedure Guide.
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15310-MA SDH.
Step 2 Consult site records to determine whether the port raising the alarm has been assigned.
Step 3 If the port is not currently assigned, place the port out of service using the following steps:
a. In node view, double-click the E1 card (15310-MA SDH CTX, E1-21/DS3-E3-3, or
E1-63/DS3-E3-3) to display the card view.
b. Click the Maintenance > E1 tabs.
c. In the Admin State column, click locked, disabled.
d. Click Apply.
Step 4 If the port is assigned, verify that the correct port is in service by completing the following steps:
a. To confirm this physically, confirm that the green ACT LED is on.
b. To determine this virtually, double-click the card in CTC to display the card view and complete the
following substeps:
• Click the Provisioning > E1> Line tabs.
• Verify that the Admin State column lists the port as unlocked.
• If the Admin State column lists the port as locked, maintenance or locked, disabled, click the
column and choose unlocked. Click Apply.
Note If ports managed into unlocked administrative state are not receiving signals, the LOS
alarm is either raised or remains, and the port service state transitions to
unlocked-disabled,FLT.
Step 5 Use a test set to confirm that a valid signal exists on the line. Test the line as close to the receiving port
as possible. For specific procedures to use the test set equipment, consult the manufacturer.
Step 6 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 ONS15310-MA SDH Procedure Guide.
Step 7 If a valid signal is not present and the transmitting device is operational, replace the fiber cable
connecting the transmitting device to the port. To do this, refer to the “Install Hardware” chapter in the
Cisco ONS15310-MA SDH Procedure Guide for procedures. For more information about the cards, refer
to the Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and
Configuration Guide.
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