Lpbkterminal (Ds-N) - Cisco ONS 15327 User Documentation

Alarm Procedures
Before performing a facility loopback on an OC-N card, make sure there is another SDCC path to the
Caution
ONS 15327 containing the OC-N card being put in loopback. A second SDCC path is necessary so
you have a non-looped back path to login to the ONS 15327 containing the OC-N card being put in
loopback and remove the facility loopback. This is not necessary if you are directly connected to the
ONS 15327 with the OC-N card in facility loopback.
Procedure: Clear the LBKFACILITY Condition on the OC-N Card
To remove the loopback alarm, double-click or right-click the reporting card in the CTC. Choose Open
Step 1
from the list of options.
Click the Maintenance tab.
Step 2
Click the Loopback Type column and choose None from the menu.
Step 3
Step 4 Click Apply.

14.4.82 LPBKTERMINAL (DS-N)

•
A loopback terminal (LPBKTERMINAL) alarm means a software terminal loopback is active for a port
on the reporting card. Loopback is a commonly used troubleshooting technique. When a port is set in
terminal loopback the outgoing signal (Ethernet or DS-N) being transmitted is fed back into the receive
direction on the same port and the externally received signal is ignored. On the DS-N card the outgoing
signal continues to be transmitted and then returned in the receiving direction of the sending device. A
troubleshooter can compare the quality of the sent signal and the returned signal to determine the
condition of an isolated circuit. By setting up loopbacks on various parts of the network and excluding
other parts, a troubleshooter logically isolates the source of the problem. For more information on
loopbacks, see the
Two types of loopbacks are available: Facility and Terminal. Facility loopbacks troubleshoot ports only
and are generally performed locally or at the near end. Terminal loopbacks test ports and spans and are
often used for remote sites or far-end equipment. Loopbacks are provisioned using CTC. Terminal
loopback is not supported at the DS1 level for the XTC-28-3 card.
CTC permits loopbacks on an in-service circuit. This operation is service-affecting.
Caution
Procedure: Clear the LPBKTERMINAL Condition on an XTC Card
To remove the loopback alarm, double-click the reporting card in CTC, or right-click the reporting card
Step 1
and choose Open from the list of options.
Click the Maintenance tab.
Step 2
Choose the Loopback Type column and choose None from the menu.
Step 3
Cisco ONS 15327 User Documentation, R3.3
14-60
Not Alarmed (NA) (Condition)
"Network Tests" section on page
Chapter 14
12-19.
Alarm Troubleshooting
June 2002