Cisco ONS 15454 Troubleshooting Manual page 80

1.2.7 Perform an XC Loopback on a Source-Node OC-N STS (East to West) Carrying an Electrical Circuit
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 cross-connect 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.
Complete the
Step 6
an Electrical Circuit" procedure on page
1.2.7 Perform an XC Loopback on a Source-Node OC-N STS (East to West)
Carrying an Electrical Circuit
The XC loopback tests whether problem exists on the circuit's OC-N span by isolating this span from
others on the card. The loopback also eliminates the cross-connect card as the source of trouble for a
faulty circuit. The loopback occurs on the cross-connect card in a network circuit.
example of an XC loopback on a source OC-N 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.
You can perform an XC loopback on either the circuit source working port or the protect port of a 1+1
Note
protection group.
Cisco ONS 15454 Troubleshooting Guide, R8.5
1-36
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.
"1.2.7 Perform an XC Loopback on a Source-Node OC-N STS (East to West) Carrying
1-36.
Chapter 1 General Troubleshooting
Step 5.
for the
Figure 1-17 shows an
November 2009