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Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
78-18663-01
Chapter 2 Alarm Troubleshooting
Alarm Procedures
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15310-MA SDH.
Step 2 Ensure that the fiber connector for the port is completely plugged in. For more information about cable
connections, refer to the “Install Hardware” chapter in the Cisco ONS15310-MA SDH Procedure Guide.
Step 3 If the BER threshold is correct and at the expected level, use a test set to measure the power level of the
line to ensure it is within guidelines. For specific procedures to use the test set equipment, consult the
manufacturer.
Step 4 If the power level is good, verify that receive levels are within the acceptable range. The correct
specifications are listed in the “Install Hardware” chapter in the Cisco ONS15310-MA SDH Procedure
Guide.
Step 5 If receive levels are good, clean the fibers at both ends according to site practice. If no site practice exists,
complete the procedure in the “Maintain the Node” chapter in the Cisco ONS15310-MA SDH Procedure
Guide.
Step 6 If the condition does not clear, verify that single-mode fiber is used.
Step 7 If the fiber is of the correct type, verify that a single-mode laser is used at the far-end node.
Step 8 Clean the fiber connectors at both ends for a signal degrade according to site practice. If no practice
exists, use the procedure in the “Maintain the Node” chapter in the Cisco ONS15310-MA SDH Procedure
Guide.
Step 9 If the problem does not clear, the transmitter at the other end of the optical line could be failing and
require replacement.
Step 10 If the condition 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).
2.7.190 MS-DEG
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SDH Logical Objects: E3, STM
An SD Line condition applies to the line level of the SDH signal and travels on the B2 byte of the SDH
overhead for a 15310-MA SDH CTX, E1-21/DS3-E3-3, or E1-63/DS3-E3-3 E3 signal, or a for a
15310-MA SDH CTX card. An MS-DEG condition on an Ethernet card or STM1 port does not cause a
protection switch. If the condition is reported on a port that has also undergone a protection switch, the
SD BER count continues to accumulate. The condition is superseded by higher-priority alarms such as
2.7.123 LOF (STM) or 2.7.138 LOS (STM).
Clear the MS-DEG Condition
Step 1 Complete the “Clear an STM-N Port Facility or Terminal Loopback Circuit” procedure on page 2-154.
Step 2 Ensure that the fiber connector for the port is completely plugged in. For more information about fiber
connections, refer to the “Install Hardware” chapter in the Cisco ONS15310-MA SDH Procedure Guide.
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