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1.2.7 Perform an XC Loopback on a Source-Node STM-N VC (East to West) Carrying an Electrical Circuit
b.
c.
d.
Initiate an external switching command (side switch) on the cross-connect cards before you retest the
Step 2
loopback circuit:
Caution
Cross-connect side switches are service-affecting. Any live traffic on any card in the node endures a hit
of up to 50 ms.
a.
b.
c.
d.
Resend test traffic on the loopback circuit.
Step 3
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 XC loopback 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
This procedure is performed only on STM-N and XC-VXL cards.
Note
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-34
Position the cursor over the standby cross-connect card.
Right-click and choose RESET CARD.
Click Yes in the confirmation dialog box.
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 > Card tabs.
In the Cross-Connect Cards area, click Switch.
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/STBY LED turns green. The former active card becomes standby and its
ACT/STBY LED turns amber.
Click the Circuits tab.
Choose the XC loopback circuit being tested.
Click Delete.
Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
Confirm that the XC loopback circuit is deleted form the Circuits tab list. If the test set indicates a
good circuit, the problem might be a defective cross-connect card.
"Retest the Original XC-VXL
1-34.
Chapter 1
General Troubleshooting
July 2005
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