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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.248 LPBKFACILITY (TRUNK)
Note OC-3 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.
Caution CTC permits loopbacks on an in-service (IS) circuit. Loopbacks are Service-Affecting (SA).
Caution Before performing a facility (line) loopback on an OC-N card, ensure that the card contains at least two
DCC paths to the node where the card is installed. A second DCC path provides a nonlooped path to log
into the node after the loopback is applied, thus enabling you to remove the facility loopback. Ensuring
a second DCC is not necessary if you are directly connected to the ONS 15454 containing the loopback
OC-N.
Clear the LPBKFACILITY (OCN) Condition
Step 1 Complete the “Clear an OC-N Card Facility or Terminal Loopback Circuit” procedure on page 2-276.
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.
2.7.248 LPBKFACILITY (TRUNK)
For information about this alarm or condition, refer to the “Alarm Troubleshooting” chapter in the
Cisco ONS 15454 DWDM Troubleshooting Guide. This guide discusses all DWDM alarms.
2.7.249 LPBKTERMINAL (CEMR, CE1000, CE100T)
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Objects: CEMR, CE1000, CE100T,
A Loopback Terminal condition on a CE-Series port occurs when a software terminal loopback is active
for a port on the card.
Note For information about troubleshooting Ethernet circuits with loopbacks, refer to the
“1.5 Troubleshooting Ethernet Circuit Paths With Loopbacks” section on page 1-68.
Note For more information about Ethernet cards, refer to the Cisco ONS 15454 and
Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide.
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