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Cisco ONS 15454 Troubleshooting Guide, R8.5
November 2009
Chapter 2 Alarm Troubleshooting
2.7.239 LPBKFACILITY (E1)
Note ONS 15454 DS-3 terminal (inward) loopbacks do not transmit an “AIS” alarm on page 2-36, in the
direction away from the loopback. Instead of AIS, a continuance of the signal transmitted into the
loopback is provided. A DS3/EC1-48 card can be provisioned to transmit AIS for a terminal loopback if
desired.
Clear the LPBKFACILITY (DS1, DS3) Condition
Step 1 Complete the “Clear a DS3XM-6, DS3XM-12, or DS3E-12 Card 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.
2.7.239 LPBKFACILITY (E1)
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: E1
A Loopback Facility on an E1 port condition occurs when a software facility (line) loopback is active
for a DS1/E1-56 card port operating in All E1 mode.
For information about troubleshooting electrical circuits with loopbacks, refer to the
“1.2 Troubleshooting Electrical Circuit Paths With Loopbacks” section on page 1-9.
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 lockout or Force switch to protect traffic, the
LPBKFACILITY condition can be accompanied by a more serious alarms such as LOS.
Note E1 facility (line) loopbacks transmit an AIS in the direction away from the loopback, but this is
provisionable.
Clear the LPBKFACILITY (E1) Condition
Step 1 Complete the “Clear Other Electrical Card or Ethernet Card Loopbacks” procedure on page 2-277.
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.
2.7.240 LPBKFACILITY (EC1)
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
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