1-14
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 1 General Troubleshooting
1.2.3 Perform an XC Loopback on the Source Optical Port
Create the XC Loopback on the Source-Node Optical Port
Step 1
Connect an optical test set to the optical port you are testing:
Note
For specific procedures to use the test set equipment, consult the manufacturer.
a.
If you just completed the
“1.2.2 Perform a Terminal Loopback on a Source-Node Optical Port”
, leave the optical test set hooked up to the source-node port.
b.
If you are starting the current procedure without the optical test set hooked up to the source port,
use appropriate cabling to attach the Tx and Rx terminals of the optical test set to the port you are
testing. The Tx and Rx terminals connect to the same port.
Step 2
Adjust the test set accordingly. (Refer to manufacturer instructions for test-set use.)
Step 3
Use CTC to put the circuit being tested out of service:
a.
In node view, click the
Circuits
tab.
b.
Click the circuit and then click
Edit
.
c.
In the Edit Circuit dialog box, click the
State
tab.
d.
Choose
Locked,maintenance
from the Target Circuit Admin State drop-down list.
e.
Click
Apply
.
f.
Click
Yes
in the confirmation dialog box.
Step 4
Use CTC to set up the XC loopback on the circuit being tested:
a.
In node view, double-click the STM-N card to display the card view.
b.
Click the
Maintenance > Loopback > VC3
or
VC4
tabs (or
Maintenance > Optical >
Loopback > VC3
or
VC4
tabs).
c.
Click the check box in the
XC Loopback
column for the port being tested.
d.
Click
Apply
.
e.
Click
Yes
in the confirmation dialog box.
Step 5
Complete the
“Test and Clear the XC Loopback Circuit” procedure on page 1-14
.
Test and Clear the XC Loopback Circuit
Step 1
If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 2
Examine the test traffic received by the test set. Look for errors or any other signal information that the
test set is capable of indicating.
Step 3
If the test set indicates a good circuit, no further testing is necessary with the cross-connect. Clear the
XC loopback:
a.
In card view, click the
Maintenance > Loopback > VC3
or
VC4
tabs (or
Maintenance > Optical >
Loopback > VC3
or
VC4
tabs).
b.
Uncheck the check box in the XC Loopback column for the circuit being tested.
c.
Click
Apply
.
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