Specifications

1-56
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 1 Alarm Troubleshooting
1.3.78 LPBKDS1FEAC
• Not Alarmed (NA) (Condition)
A DS-1 loopback signal is received from the far-end node due to a Far-End Alarm and Control (FEAC)
command. An FEAC command is often used with loopbacks.
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 narrow down the
source of the problem. For more information about loopbacks, see the “Network Tests” section on
page 2-3.
Caution The CTC permits loopbacks on an in-service circuit. This operation is service affecting.
Note This is an informational alarm.
1.3.79 LPBKDS3FEAC
• Not Alarmed (NA) (Condition)
A DS-3 loopback signal is received from the far-end node because of a Far-End Alarm and Control
(FEAC) command. An FEAC command is often used with loopbacks.
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 this isolated circuit. 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 about loopbacks, see the “Network Tests” section on
page 2-3.
Caution The CTC permits loopbacks on an in-service circuit. This operation is service affecting.
Note This is an informational alarm.
1.3.80 LPBKFACILITY (DS-N)
• Not Alarmed (NA) (Condition)
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 this isolated circuit. 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, see“Network Tests” section on page 2-3.