Cisco ONS 15454 SDH - Perform a Facility (Line) Loopback on a Destination-Node Electrical Port (East to West)

1-24
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.2.5 Perform a Facility (Line) Loopback on a Destination-Node Electrical Port (East to West)
b. Complete “Physically Replace a Traffic Card” procedure on page 2-271 for the faulty card.
Step 4 Clear the terminal (inward) loopback state on the port:
a. Double-click the destination-node electrical card.
b. Click the Maintenance > Loopback tabs.
c. Select None from the Loopback Type column for the port being tested.
d. Select the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) in the
Admin State column for the port being tested.
e. Click Apply.
f. Click Yes in the confirmation dialog box.
Step 5 Clear the terminal (inward) loopback circuit:
a. Click the Circuits tab.
b. Choose the loopback circuit being tested.
c. Click Delete.
d. Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
Step 6 Complete the “1.2.5 Perform a Facility (Line) Loopback on a Destination-Node Electrical Port (East to
West)” procedure on page 1-24.
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. Figure 1-15 shows an
example of a facility loopback on a destination E1-N-14 port.
Figure 1-15 Facility Loopback on a Destination E1-N-14 Port
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.
Destination
ONS Node
E1-N STM-NXC
Source
ONS Node
Intermediate
ONS Node
Test Set
E1-N XC STM-N E1-N XC STM-N
124009