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Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 1 General Troubleshooting
1.2.4 Perform a Facility Loopback or Payload Loopback on an Intermediate-Node Optical Port
Caution
Performing a loopback on an in-service circuit is service-affecting.
Note
Facility and payload loopbacks require on-site personnel.
Complete the
“Create a Facility Loopback or Payload Loopback on an Intermediate-Node Optical Port”
Create a Facility Loopback or Payload Loopback on an Intermediate-Node Optical Port
Step 1
Connect an optical test set to the port you are testing. If you are starting the current procedure without
the optical test set hooked up to the source port port, use appropriate cabling to attach the Tx and Rx
terminals of the optical test set to the port you are testing. Both Tx and Rx connect to the same port.
For specific procedures to use the test set equipment, consult the manufacturer.
Step 2
Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Step 3
Use CTC to set up the facility loopback on the test port:
a.
In node view, click the
Circuits
tab and click
Create
.
b.
In the Circuit Creation dialog box, choose the type, such as VC_HO_PATH_CIRCUIT, and circuit
number, such as 1.
c.
Click
Next
.
d.
In the next Circuit Creation dialog box, give the circuit an easily identifiable name such as
Opt1toOpt3.
e.
Leave the Bidirectional check box checked.
f.
Click
Next
.
g.
In the Circuit Creation source dialog box, select the same Node, card Slot, Port, and VC where the
test set is connected.
h.
Click
Next
.
i.
In the Circuit Creation destination dialog box, use the same Node, card Slot, Port, and VC used for
the source dialog box.
j.
Click
Next
.
k.
In the Circuit Creation circuit routing preferences dialog box, leave all defaults. Click
Finish
.
Step 4
Confirm that the newly created circuit appears on the Circuits tab list as a two-way circuit.
Note
It is normal for the
“LPBKFACILITY (STMN)” condition on page 2-88
to appear during a
loopback setup. The condition clears when you remove the loopback.
Step 5
Create the facility loopback on the intermediate port being tested:
a.
Go to the node view of the intermediate node:
•
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
.
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