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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 2 Alarm Troubleshooting
2.7.157 LPBKFACILITY (EC1)
Clear the LPBKFACILITY (DS1, DS3) Condition
Step 1 Complete the “Clear a DS-3 or DS-1 Port Loopback Circuit” procedure on page 2-156.
Step 2 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).
2.7.157 LPBKFACILITY (EC1)
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: EC1
A Loopback Facility condition for an EC-1 port occurs when a software facility (line) loopback is active
for a port on the reporting 15310-CL-CTX, DS1-28/DS3-EC1-3, or DS1-84/DS3-EC1-3 card.
For information about troubleshooting optical circuits with loopbacks, refer to the “1.1 Network
Troubleshooting Tests” section on page 1-2.
Caution CTC permits loopbacks to be performed on an in-service (IS) circuit. Loopbacks are
Service-Affecting (SA).
Clear the LPBKFACILITY (EC1) Condition
Step 1 Complete the “Clear an EC-1 Port Loopback” procedure on page 2-157.
Step 2 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).
2.7.158 LPBKFACILITY (OCN)
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: OCN
A Loopback Facility condition for an OC-N signal occurs when a software facility (line) loopback is
active for an OC-3 or OC-12 port on the 15310-CL-CTX or CTX2500 card.
For information about troubleshooting optical circuits with loopbacks, refer to the “1.3 Identify Points
of Failure on an OC-N Circuit Path” section on page 1-14. Facility loopbacks are described in the
“1.1.1 Facility Loopback” section on page 1-2.
Note OC-N facility loopbacks do not transmit an AIS in the direction away from the loopback. Instead of AIS,
a continuance of the signal transmitted to the loopback is provided.