Lpbkfacility (Oc-N) - Cisco ONS 15327 User Documentation

Chapter 14 Alarm Troubleshooting
A loopback facility (LPBKFACILITY) alarm means a software facility loopback is active for a port on
the reporting card. Loopback is a commonly used troubleshooting technique. A signal is sent out on a
link or part of the network and returned to the sending device. By setting up loopbacks on various parts
of the network and excluding other parts, a troubleshooter can logically narrow down the source of the
problem. For more information on loopbacks,
There are two types of loopbacks: 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. You can provision loopbacks through CTC.
The CTC permits loopbacks to be performed on an in-service circuit. This operation is service-affecting.
Caution
XTC-28-3 cards only support facility loopbacks on DS-1 circuits.
Note
Procedure: Clear the LBKFACILITY Condition on the XTC-28-3 Card
Step 1 Double-click the reporting card in CTC or right-click the reporting card in CTC and choose Open from
the menu.
Step 2 Click the Maintenance tab:
a.
b.
Step 3 Click the Loopback Type column cell that displays Facility (Line).
Click None, and click Apply.
Step 4

14.4.81 LPBKFACILITY (OC-N)

•
A loopback facility (LPBKFACILITY) alarm means a software facility loopback is active for a port on
the reporting card. Loopback is a commonly used troubleshooting technique. A signal is sent out on a
link or part of the network and returned to 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 can logically
isolate the source of the problem. For more information on loopbacks, see the
on page
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. You provision loopbacks using CTC.
June 2002
If the condition is reported against an XTC-28-3 card, also click the DS1 tab.
If a Loopback Type column cell that displays Facility (Line) is not shown under the DS1 tab, then
click the DS3 tab to reveal a Loopback Type column cell that displays Facility (Line).
Not Alarmed (NA) (Condition)
12-19.
see"Network Tests" section on page
Cisco ONS 15327 User Documentation, R3.3
Alarm Procedures
12-19.
"Network Tests" section
14-59