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Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
78-18663-01
Chapter 2 Alarm Troubleshooting
Alarm Procedures
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 cable 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 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.
Step 8 Repeat Steps 1 to 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/cisco/web/support/index.html for more information or call Cisco TAC
(1-800-553-2447) in order to report a Service-Affecting (SA) problem.
2.7.136 LOS (E3)
Default Severity: Critical (CR), Service-Affecting (SA)
SDH Logical Object: E3
LOS on a 15310-MA SDH CTX, E1-21/DS3-E3-3, or E1-63/DS3-E3-3 card E3 port occurs when a SDH
receiver detects an all-zero pattern for 10 microseconds or longer. An LOS (E3) most likely means that
the upstream transmitter has failed. If an E3 LOS alarm is not accompanied by additional alarms, a
cabling problem (such as an incorrect attachment, a fiber cut, or another fiber error) usually causes this
alarm. The condition clears when the problem is corrected, allowing two consecutive valid frames to be
received.
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 (E3) Alarm
Step 1 Using site practice, verify cabling continuity to the port reporting the alarm.
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15310-MA SDH.
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