Cisco ONS 15310-MA Troubleshooting Manual page 105

Chapter 2 Alarm Troubleshooting
2.7.149 LPBKTERMINAL (E3)
A Loopback Terminal condition for an E3 port occurs when a software terminal (inward) loopback is
active for an E3 port on a 15310-MA SDH CTX, E1-21/DS3-E3-3, or E1-63/DS3-E3-3 card.
For information about troubleshooting optical circuits with loopbacks, refer to the
Troubleshooting Tests" section on page
CTC permits loopbacks to be performed on unlocked circuits. Loopbacks are Service-Affecting (SA).
Caution
Clear the LPBKTERMINAL (E3) Condition
Complete the
Step 1
If the condition does not clear, log into the Technical Support Website at
Step 2
http://www.cisco.com/cisco/web/support/index.html for more information or call Cisco TAC
(1-800-553-2447).
2.7.150 LPBKTERMINAL (STM)
A Loopback Terminal condition for an STM-N port occurs when a software terminal (inward) loopback
is active for an STM1 or STM4 port on the ONS 15310-MA SDH.
Note STM-N terminal loopbacks do not typically return an AIS.
Performing a loopback on an in-service circuit is Service-Affecting (SA). If you did not perform a
Note
lockout or Force switch to protect traffic, the LPBKTERMINAL condition can also be accompanied by
a more serious alarm such as LOS.
For information about troubleshooting electrical circuits with loopbacks, refer to the
Points of Failure on an Electrical Circuit Path" section on page
"1.3 Identify Points of Failure on an STM-N Circuit Path" section on page
are described in the
Clear the LPBKTERMINAL (STM) Condition
Step 1 Complete the
78-18663-01
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SDH Logical Object: E3
"Clear an E3 Port Loopback" procedure on page
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SDH Logical Object: STM
"1.1.2 Terminal Loopback" section on page
"Clear an STM-N Port Facility or Terminal Loopback Circuit" procedure on page
1-2.
2-155.
1-4; for optical circuits, refer to the
1-3.
Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
Alarm Procedures
"1.1 Network
"1.2 Identify
1-13. Terminal loopbacks
2-154.
2-105