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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
Chapter 2 Alarm Troubleshooting
2.7.155 LPBKFACILITY (CE100T)
SONET Logical Object: DS3
The DS-3 Loopback Command Sent To Far End condition occurs on a near-end 15310-CL-CTX,
DS1-28/DS3-EC1-3, or DS1-84/DS3-EC1-3 card when you send a DS-3 FEAC loopback.
Note LPBKDS3FEAC-CMD is an informational condition and does not require troubleshooting.
2.7.155 LPBKFACILITY (CE100T)
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: CE100T
A Loopback Facility condition on a CE-100T-8 port occurs when a software facility (line) loopback is
active for a port on the card.
For information about troubleshooting optical circuits with loopbacks, refer to the “1.1 Network
Troubleshooting Tests” section on page 1-2.
Clear the LPBKFACILITY (CE100T) Condition
Step 1 Complete the “Clear an Ethernet Card Loopback Circuit” 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).
2.7.156 LPBKFACILITY (DS1, DS3)
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: DS1, DS3
A Loopback Facility condition for a DS-1 or DS-3 signal occurs when a software facility (line) loopback
is active for a DS-1 or DS-3 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 “1.2 Identify Points
of Failure on an Electrical Circuit Path” section on page 1-3. Facility loopbacks are described in the
“1.1 Network Troubleshooting Tests” section on page 1-2.
Note CTC permits loopbacks to be performed on an in-service (IS) circuit. Performing a loopback is
Service-Affecting (SA). If you did not perform a lock out or Force switch to protect traffic, the
LPBKFACILITY condition can be accompanied by a more serious alarms such as LOS.
Note DS-3 facility (line) 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.