Cisco ONS 15454 Troubleshooting Manual page 29

Chapter 1 General Troubleshooting
1.3.7 Perform an XC Loopback on a Source Node OC-N STS (East to West)
The XC loopback tests whether any problem exists on the circuit's OC-N span, isolating this span from
others present on the card. It also eliminates the cross-connect card as the source of trouble for a faulty
circuit. The loopback occurs on the XC10G cross-connect card in a network circuit.
an example of an XC loopback on a source OC-N port.
Note The XC Loopback on an OC-N card does not affect traffic on other circuits.
Figure 1-16 XC Loopback on a Source OC-N Port
Test Set
Step 1 Connect an optical test set to the port you are testing:
Note
a.
b.
c.
Use CTC to put the circuit being tested out of service:
Step 2
a.
b.
c.
d.
e.
f.
Use CTC to set up the XC loopback on the circuit being tested:
Step 3
a.
b.
c.
d.
November 2004
OC-Nx XC
Refer to the manufacturer's instructions for detailed information about connection and setup of
the optical test set.
If you just completed the "1.5.2 Perform a Terminal (Inward) Loopback on a Source-Node OC-N,
G-Series, MXP, or TXP Port" section on page
node port.
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.
Adjust the test set accordingly.
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 OOS-MT from the Target Circuit State drop-down list.
Click Apply.
Click Yes in the confirmation dialog box.
In node view, double-click the OC-N card to open the card view.
Click the Provisioning > SONET STS tabs.
Click the check box in the XC Loopback column for the port being tested.
Click Apply.
1.3.7 Perform an XC Loopback on a Source Node OC-N STS (East to West)
OC-Ny
1-40, leave the optical test set hooked up to the source
Cisco ONS 15454 Troubleshooting Guide, R4.6
Figure 1-16 shows
1-29