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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 2 Alarm Troubleshooting
2.7.199 SD-L
Note The recommended test set for use on all SONET ONS electrical ports is the Omniber 718.
Clear the SD (DS1, DS3) Condition
Step 1 Complete the “Clear a DS-3 or DS-1 Port Loopback Circuit” procedure on page 2-156.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15310-CL
or ONS 15310-MA.
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 ONS 15310-CL and
Cisco ONS 15310-MA 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 ONS 15310-CL and
Cisco ONS 15310-MA 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 ONS 15310-CL and
Cisco ONS 15310-MA 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 ONS 15310-CL and
Cisco ONS 15310-MA 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/techsupport for more information or call Cisco TAC (1-800-553-2447).
2.7.199 SD-L
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: EC1, OCN
An SD Line condition applies to the line level of the SONET signal and travels on the B2 byte of the
SONET overhead for a 15310-CL-CTX, DS1-28/DS3-EC1-3, or DS1-84/DS3-EC1-3 EC1 signal, or a
for a 15310-CL-CTX or CTX2500 card. An SD-L condition on an Ethernet card or OC-3 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 2.7.135 LOF (OCN) or 2.7.150 LOS (OCN).