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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, Release 9.0

78-18394-01

Chapter 2 Alarm Troubleshooting

Alarm Procedures

2.7.162 LPBKFACILITY (OCN)

Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)

SONET Logical Object: OCN

A Loopback Facility condition for an OC-N signal occurs when a software facility (line) loopback is

active for an OC-3 or OC-12 port on the 15310-CL-CTX or CTX2500 card.

For information about troubleshooting optical circuits with loopbacks, refer to the “1.3 Identify Points

of Failure on an OC-N Circuit Path” section on page 1-16. Facility loopbacks are described in the

“1.1.1 Facility Loopback” section on page 1-2.

Note OC-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.

Caution CTC permits loopbacks to be performed on an in-service (IS) circuit. Loopbacks are

Service-Affecting (SA).

Note Before performing a facility (line) loopback on an OC-3 or OC-12 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-CL or

ONS 15310-MA containing the loopback OC-3 or OC-12.

Clear the LPBKFACILITY (OCN) Condition

Step 1 Complete the “Clear an OC-N Port Facility or Terminal Loopback Circuit” procedure on page 2-165.

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).

2.7.163 LPKTERMINAL (CE100T, CEMR)

Default Severity: Not Alarmed (NA), Non-Service-Affecting (NSA)

SONET Logical Objects: CE100T, CEMR

A Loopback Terminal condition on a CE-Series port occurs when a software terminal loopback is active

for a port on the card.

For information about troubleshooting optical circuits with loopbacks, refer to the “1.1 Network

Troubleshooting Tests” section on page 1-2.

Clear the LPBKTERMINAL (CE100T, CEMR) Condition

Step 1 Complete the “Clear an Ethernet Card Loopback Circuit” procedure on page 2-166.

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Cisco 15310-MA Guida alla Risoluzione dei Problemi Pagina 241