Cisco ONS 15310-MA Troubleshooting Manual page 103

Chapter 2 Alarm Troubleshooting
A Loopback Facility condition for an E3 port occurs when a software facility (line) loopback is active
for a port on the reporting 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 an unlocked circuit. Loopbacks are Service-Affecting (SA).
Caution
Clear the LPBKFACILITY (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).
2.7.146 LPBKFACILITY (STM)
A Loopback Facility condition for an STM-N signal occurs when a software facility (line) loopback is
active for an STM1 or STM4 port on the ONS 15310-MA SDH.
For information about troubleshooting optical circuits with loopbacks, refer to the
of Failure on an STM-N Circuit Path" section on page
"1.1.1 Facility Loopback" section on page
CTC permits loopbacks to be performed on an unlocked circuit. Loopbacks are Service-Affecting (SA).
Caution
STM-N facility loopbacks do not transmit an AIS in the direction away from the loopback. Instead of
Note
AIS, a continuance of the signal transmitted to the loopback is provided.
Before performing a facility (line) loopback on an STM1 or STM4 port, ensure the card contains at least
Note
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 15310-MA SDH
containing the loopback STM1 or STM4.
Clear the LPBKFACILITY (STM) Condition
Complete the
Step 1
78-18663-01
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
"Clear an STM-N Port Facility or Terminal Loopback Circuit" procedure on page
1-2.
2-155.
1-13. Facility loopbacks are described in the
1-2.
Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
Alarm Procedures
"1.1 Network
"1.3 Identify Points
2-154.
2-103