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1.2.4 Perform a Terminal (Inward) Loopback on a Destination Electrical Port (West to East)
If you are starting the current procedure without the electrical test set hooked up to the source port,
b.
use appropriate cabling to attach the Tx and Rx terminals of the electrical test set to the electrical
connection panel or the FMEC card connectors for the port you are testing. Both Tx and Rx connect
to the same port.
Adjust the test set accordingly.
Step 2
In CTC node view, click the Circuits tab and click Create.
Step 3
In the Circuit Creation dialog box, choose the type and size, such as such as VC HO Path Circuit, and
Step 4
number, such as 1.
Click Next.
Step 5
In the next Circuit Creation dialog box, give the circuit an easily identifiable name, such as ENtoEN.
Step 6
Leave the Bidirectional check box checked. Leave the default value for State.
Step 7
Step 8
Click Next.
Step 9
In the Circuit Creation source dialog box, select the Node, Slot, Port, and VC4 where the test set is
connected.
Step 10
Click Next.
Step 11
In the Circuit Creation destination dialog box, fill in the same Node, Slot, Port, and VC4 (the
destination-node port) and click Finish.
Confirm that the newly created circuit appears in the Circuits tab Dir column as a two-way circuit.
Step 12
Note
Note
Create the terminal (inward) loopback on the destination port being tested:
Step 13
Go to the node view of the destination node:
a.
•
•
In node view, double-click the card that requires the loopback, such as an E-1 card in the destination
b.
node.
Click the Maintenance > Loopback tabs.
c.
Select Locked,maintenance from the Admin State column. If this is a multiport card, select the row
d.
appropriate for the desired port.
Select Terminal (Inward) from the Loopback Type column. If this is a multiport card, select the
e.
row appropriate for the desired port.
Click Apply.
f.
Click Yes in the confirmation dialog box.
g.
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-22
It is normal for a
"LPBKTERMINAL (DS3)" condition, page 2-171
setup. The condition clears when you remove the loopback.
Electrical circuit terminal loopbacks do not transmit an AIS (see the
page
2-30) in the direction away from the loopback. Instead of an AIS, a continuance of the
signal transmitted to the loopback is provided.
Choose View > Go To Other Node from the menu bar.
Choose the node from the drop-down list in the Select Node dialog box and click OK.
Chapter 1
General Troubleshooting
to appear during a loopback
"AIS" condition on
July 2005
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