Cisco CTX2500 User Manual

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Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
78-18663-01
Chapter 2 Alarm Troubleshooting
Alarm Procedures
SDH Logical Object: E3
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 “1.1 Network
Troubleshooting Tests” section on page 1-2.
Caution CTC permits loopbacks to be performed on an unlocked circuit. Loopbacks are Service-Affecting (SA).
Clear the LPBKFACILITY (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).
2.7.146 LPBKFACILITY (STM)
Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)
SDH Logical Object: 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 “1.3 Identify Points
of Failure on an STM-N Circuit Path” section on page 1-13. Facility loopbacks are described in the
“1.1.1 Facility Loopback” section on page 1-2.
Caution CTC permits loopbacks to be performed on an unlocked circuit. Loopbacks are Service-Affecting (SA).
Note STM-N facility loopbacks do not transmit an AIS in the direction away from the loopback. Instead of
AIS, a continuance of the signal transmitted to the loopback is provided.
Note Before performing a facility (line) loopback on an STM1 or STM4 port, ensure the card contains at least
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
Step 1 Complete the “Clear an STM-N Port Facility or Terminal Loopback Circuit” procedure on page 2-154.

Cisco CTX2500 Specifications

General

Brand	Cisco
Model	CTX2500
Category	Network Card
Language	English