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1.2.2 Perform a Hairpin Test on a Source-Node Electrical Port (West to East)
Initiate an external switching command (side switch) on the cross-connect cards before you retest the
Step 2
loopback circuit:
Cross-connect side switches are service-affecting. Any live traffic on any card in the node endures a hit
Caution
of up to 50 ms.
a.
b.
c.
d.
Note
Step 3
Resend test traffic on the loopback circuit.
The test traffic now travels through the alternate cross-connect card.
If the test set indicates a faulty circuit, assume the cross-connect card is not causing the problem. Clear
Step 4
the hairpin circuit:
a.
b.
c.
d.
e.
To confirm a defective original cross-connect card, complete the
Step 5
Cross-Connect Card" procedure on page
Retest the Original XC-VXL Cross-Connect Card
Step 1
Initiate an external switching command (side switch) on the cross-connect cards:
a.
b.
c.
d.
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-16
Determine the standby cross-connect card. On both the physical node and the CTC node view
window, the standby cross-connect ACT/STBY LED is amber and the active card ACT/STBY LED
is green.
In the node view, select the Maintenance > Cross Connect > Cards tabs.
In the Cross Connect Cards menu, click Switch.
Click Yes in the Confirm Switch dialog box.
After the active cross-connect goes into standby mode, the original standby card becomes active
and its ACT/STBY LED turns green. The former active card becomes standby and its
ACT/STBY LED turns amber.
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. Do not check any check
boxes.
Confirm that the hairpin circuit is deleted form the Circuits tab list.
Determine the standby cross-connect card. On both the physical node and the CTC node view
window, the standby cross-connect ACT/STBY LED is amber and the active cross-connect
ACT/STBY LED is green.
In node view, select the Maintenance > Cross Connect > Cards tabs.
From the Cross Connect Cards menu, choose Switch.
Click Yes in the Confirm Switch dialog box.
"Retest the Original XC-VXL
1-16.
Chapter 1
General Troubleshooting
July 2005
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