Cisco ONS 15454 Troubleshooting Manual page 364

2.7.239 LPBKFACILITY (E1)
ONS 15454 DS-3 terminal (inward) loopbacks do not transmit an
Note
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
Complete the
Step 1
page
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)
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
CTC permits loopbacks to be performed on an in-service (IS) circuit. Performing a loopback is
Note
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.
E1 facility (line) loopbacks transmit an AIS in the direction away from the loopback, but this is
Note
provisionable.
Clear the LPBKFACILITY (E1) Condition
Complete the
Step 1
If the condition does not clear, log into the Technical Support Website at
Step 2
http://www.cisco.com/techsupport for more information or call Cisco TAC 1 800 553-2447.
2.7.240 LPBKFACILITY (EC1)
Cisco ONS 15454 Troubleshooting Guide, R8.5
2-170
"Clear a DS3XM-6, DS3XM-12, or DS3E-12 Card Loopback Circuit" procedure on
2-276.
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SONET Logical Object: E1
"Clear Other Electrical Card or Ethernet Card Loopbacks" procedure on page
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
Chapter 2 Alarm Troubleshooting
"AIS" alarm on page 2-36, in the
1-9.
November 2009
2-277.