Cisco ONS 15454 Troubleshooting Manual page 62

1.2.3 Perform an XC Loopback on a Destination-Node OC-N STS (West to East) Carrying an Electrical Signal
d.
Resend test traffic on the loopback circuit.
Step 2
If the test set indicates a faulty circuit, the problem is probably the defective card. Return the defective
Step 3
card to Cisco through the RMA process. Contact Cisco Technical Support at 1 800 553-2447 and
proceed to
Complete the
Step 4
defective card.
If the test set indicates a good circuit, the cross-connect card might have had a temporary problem that
Step 5
was cleared by the side switch. Clear the hairpin circuit:
a.
b.
c.
d.
e.
Step 6 Complete the
Carrying an Electrical Signal" procedure on page
1.2.3 Perform an XC Loopback on a Destination-Node OC-N STS (West to East)
Carrying an Electrical Signal
The XC loopback tests whether any problem exists on the circuit's OC-N span, isolating this span from
others present on the card. The loopback occurs on the cross-connect card in a network circuit.
Figure 1-13
similar to a terminal loopback but traffic is only carried on one STS instead of affecting the entire port.
The XC loopback on an OC-N card does not affect traffic on other circuits.
Note
Note XC loopbacks do not require on-site personnel.
Note You can perform an XC loopback on either the circuit source working or the protect port of a 1+1
protection group.
Cisco ONS 15454 Troubleshooting Guide, R8.5
1-18
Click Yes in the Confirm Switch dialog box.
After the active cross-connect goes into standby mode, the original standby card becomes
Note
active and its ACT/SBY LED turns green. The former active card becomes standby and its
ACT/SBY LED turns amber.
Step 4. If the test does not indicate a faulty circuit, proceed to
"Physically Replace an In-Service Cross-Connect Card" procedure on page 2-274
Click the Circuits tab.
Choose the hairpin circuit being tested.
Click Delete.
Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
Confirm that the hairpin circuit is deleted from the Circuits tab list.
"1.2.3 Perform an XC Loopback on a Destination-Node OC-N STS (West to East)
shows an example of an XC loopback on a destination OC-N port. The traffic pattern looks
Chapter 1
Step
1-18.
General Troubleshooting
5.
for the
November 2009