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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter2 Alarm Troubleshooting
2.7.161 LPBKTERMINAL (EC1)
For information about troubleshooting optical circuits with loopbacks, refer to the “1.2 Identify Points
of Failure on an Electrical Circuit Path” section on page1-3. Facility loopbacks are described in the
“1.1 Network Troubleshooting Tests” section on page1-2.

Clear the LPBKTERMINAL (DS1, DS3) Condition

Step1 Complete the “Clear a DS-3 or DS-1 Port Loopback Circuit” procedure on page2-156.
Step2 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).
2.7.161 LPBKTERMINAL (EC1)
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: EC1
A Loopback Terminal condition for an EC-1 port occurs when a software terminal (inward) loopback is
active for an EC1 port on a 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 page1-2.
Caution CTC permits loopbacks to be performed on in-service (IS) circuits. Loopbacks are
Service-Affecting(SA).

Clear the LPBKTERMINAL (EC1) Condition

Step1 Complete the “Clear an EC-1 Port Loopback” procedure on page 2-157.
Step2 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).
2.7.162 LPBKTERMINAL (OCN)
Default Severity: NotAlarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: OCN
A Loopback Terminal condition for an OC-N port occurs when a software terminal (inward) loopback
is active for an OC-3 or OC-12 port on the 15310-CL-CTX or CTX2500 card.
Note OC-N terminal loopbacks do not typically return an AIS.