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Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
78-18663-01
Chapter 2 Alarm Troubleshooting
Alarm Procedures
2.7.149 LPBKTERMINAL (E3)
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SDH Logical Object: 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 “1.1 Network
Troubleshooting Tests” section on page 1-2.
Caution CTC permits loopbacks to be performed on unlocked circuits. Loopbacks are Service-Affecting (SA).
Clear the LPBKTERMINAL (E3) Condition
Step 1 Complete the “Clear an E3 Port Loopback” procedure on page 2-155.
Step 2 If the condition does not clear, log into the Technical Support Website at
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)
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SDH Logical Object: 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.
Note Performing a loopback on an in-service circuit is Service-Affecting (SA). If you did not perform a
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 “1.2 Identify
Points of Failure on an Electrical Circuit Path” section on page 1-4; for optical circuits, refer to the
“1.3 Identify Points of Failure on an STM-N Circuit Path” section on page 1-13. Terminal loopbacks
are described in the “1.1.2 Terminal Loopback” section on page 1-3.
Clear the LPBKTERMINAL (STM) Condition
Step 1 Complete the “Clear an STM-N Port Facility or Terminal Loopback Circuit” procedure on page 2-154.
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