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1.2.3 Perform an XC Loopback on a Destination-Node STM-N VC (West to East) Carrying an Electrical Signal
Figure 1-13
Test Set
Step 1
Connect an optical test set to the port you are testing:
Note
a.
b.
Adjust the test set accordingly.
Step 2
Use CTC to put the circuit being tested out of service:
Step 3
a.
b.
c.
d.
e.
f.
Use CTC to set up the XC loopback on the circuit being tested:
Step 4
a.
b.
c.
d.
e.
Complete the
Step 5
Test and Clear the XC Loopback Circuit
This procedure is performed only on STM-N cards.
Note
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-18
XC Loopback on a Destination STM-N Port
Source
ONS Node
E1-N
Refer to the manufacturer's instructions for detailed information about connection and setup of
the optical test set.
If you just completed the
"1.2.2 Perform a Hairpin Test on a Source-Node Electrical Port (West to
East)" procedure on page
If you are starting the current procedure without the optical test set hooked up to the destination 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.
In node view, click the Circuits tab.
Click the circuit and then click Edit.
In the Edit Circuit dialog box, click the State tab.
Choose Locked,maintenance from the Target Circuit State drop-down list.
Click Apply.
Click Yes in the confirmation dialog box.
In node view, double-click the optical card to display the card view.
Click the Maintenance > Loopback > VC4 tabs.
Check the check box in the XC Loopback column for the port being tested.
Click Apply.
Click Yes in the confirmation dialog box.
"Test and Clear the XC Loopback Circuit" procedure on page
XC
STM-N
1-13, leave the optical test set hooked up to the destination-node port.
Chapter 1
General Troubleshooting
Destination
ONS Node
STM-N
XC
E1-N
1-18.
July 2005
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