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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 2 Alarm Troubleshooting
2.7.147 LOS (DS3)
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 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 ONS 15310-CL and Cisco ONS 15310-MA 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 ONS 15310-CL and Cisco ONS 15310-MA 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.
Step 8 Repeat Steps 1 through 7 for any other port on the card that reports the LOS.
Step 9 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.
2.7.147 LOS (DS3)
Default Severity: Critical (CR), Service-Affecting (SA)
SONET Logical Object: DS3
The LOS (DS3) for a DS-3 port on a 15310-CL-CTX, DS1-28/DS3-EC1-3, or DS1-84/DS3-EC1-3 card
occurs when the port is in service but no signal is being received. The cabling might not be correctly
connected to the port, or no signal exists on the line. Possible causes for no signal on the line include
upstream equipment failure or a fiber cut.
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 (DS3) Alarm
Step 1 Verify that the cable is properly connected and attached to the correct port. 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.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15310-CL
or ONS 15310-MA.
Step 2 Consult site records to determine whether the port raising the alarm has been assigned.