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1.2.5 Perform a Facility (Line) Loopback on a Destination-Node Electrical Port (East to West)
b.
Clear the terminal (inward) loopback state on the port:
Step 4
a.
b.
c.
d.
e.
f.
Clear the terminal (inward) loopback circuit:
Step 5
a.
b.
c.
d.
Complete the
Step 6
West)" procedure on page
1.2.5 Perform a Facility (Line) Loopback on a Destination-Node Electrical Port
(East to West)
The facility loopback test is performed on the destination-node electrical port in the network circuit.
Completing a successful facility loopback on this port isolates the possibility that the destination-node
cabling, electrical card, LIU, or FMEC card is responsible for a faulty circuit.
example of a facility loopback on a destination E1-N-14 port.
Figure 1-15
Facility Loopback on a Destination E1-N-14 Port
E1-N
Test Set
Note
Electrical circuit facility (line) loopbacks do not transmit an AIS condition in the direction away from
the loopback. Instead of an AIS, a continuance of the signal transmitted to the loopback is provided.
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-24
Complete
"Physically Replace a Traffic Card" procedure on page 2-271
Double-click the destination-node electrical card.
Click the Maintenance > Loopback tabs.
Select None from the Loopback Type column for the port being tested.
Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the
Admin State column for the port being tested.
Click Apply.
Click Yes in the confirmation dialog box.
Click the Circuits tab.
Choose the loopback circuit being tested.
Click Delete.
Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
"1.2.5 Perform a Facility (Line) Loopback on a Destination-Node Electrical Port (East to
1-24.
Source
ONS Node
XC
STM-N
Intermediate
ONS Node
E1-N
XC
STM-N
Chapter 1
General Troubleshooting
for the faulty card.
Figure 1-15
shows an
Destination
ONS Node
E1-N
XC
STM-N
July 2005
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