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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter2 Alarm Troubleshooting
2.7.200 SD-P

Clear the SD-L Condition

Step1 Complete the “Clear an OC-N Port Facility or Terminal Loopback Circuit” procedure on page2-156.
Step2 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 ONS 15310-CL and
Cisco ONS 15310-MA Procedure Guide.
Step3 If the BER threshold is correct and at the expected level, use an optical 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.
Step4 If the optical power level is good, verify that optical receive levels are within the acceptable range. The
correct specifications are listed in the “Install Hardware” chapter in the CiscoONS 15310-CL and
Cisco ONS 15310-MA Procedure Guide.
Step5 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 CiscoONS 15310-CL and
Cisco ONS 15310-MA Procedure Guide.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS15310-CL
or ONS 15310-MA.
Step6 If the condition does not clear, verify that single-mode fiber is used.
Step7 If the fiber is of the correct type, verify that a single-mode laser is used at the far-end node.
Step8 Clean the fiber connectors at both ends for a signal degrade according to site practice.
Step9 If the problem does not clear, the transmitter at the other end of the optical line could be failing and
require replacement.
Step10 If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/techsupport for more information or call CiscoTAC (1-800-553-2447).
2.7.200 SD-P
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: STSMON, STSTRM
An SD Path condition applies to the path (STS) layer of the SONET overhead. A path or ST-level SD
alarm travels on the B3 byte of the SONET overhead.
For path protection-protected circuits, the BER threshold is user-provisionable and has a range for SD
from 1E–9 dBm to 1E–5 dBm. For 1+1 and unprotected circuits, the BER threshold value is not
user-provisionable and the error rate is hard-coded to 1E–6 dBm. An SD-P condition causes a switch
from the working port to the protect port at the path (STS) level.
The BER increase that causes the condition is sometimes caused by a physical fiber problem such as a
poor fiber connection, a bend in the fiber that exceeds the permitted bend radius, or a bad fiber splice.
SD causes the port to switch from working to protect. The SD condition clears when the BER level falls
to one-tenth of the threshold level that triggered it.