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1.3.4 Create a Terminal Loopback on an Intermediate-Node Ethernet Port
f.
g.
Complete the
Step 6
Test and Clear the Ethernet Terminal Loopback Circuit
If the test set is not already sending traffic, send test traffic on the loopback circuit.
Step 1
Examine the test traffic being received by the test set. Look for errors or any other signal information
Step 2
that the test set is capable of indicating.
If the test set indicates a good circuit, no further testing is necessary on the loopback circuit. Clear the
Step 3
terminal loopback from the port:
a.
b.
c.
d.
e.
f.
Clear the terminal loopback circuit:
Step 4
a.
b.
c.
d.
Complete the
Step 5
Test the ASAP Card
Determine whether you are experiencing trouble on a single SFP (PPM), on all PPMs within a
Step 1
4PIO (PIM), or on all 4PIO used in that ASAP card. If there is only partial failure, you might be able to
replace this part rather than the entire card.
If the errors are being observed on one port but not all ports of the ASAP, you might only need to replace
Step 2
that SFP (PPM). Remove the errored SFP (PPM) and replace it with a known-good SFP (PPM) by
completing the procedures for this in the "Install Cards and Fiber-Optic Cable" chapter of the
Cisco ONS 15600 SDH Procedure Guide.
If all SFPs (PPMs) on a particular 4PIO (PIM) are experiencing problems, the 4PIO (PIM) is indicated.
Step 3
Remove this 4PIO (PIM) and replace it with a known-good one using the procedures for this in the
"Install Cards and Fiber-Optic Cable" chapter of the Cisco ONS 15600 SDH Procedure Guide.
If the trouble still is not located, complete the
Step 4
suspected bad ASAP card and replace it with a known-good one.
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
1-40
Click Apply.
Click Yes in the confirmation dialog box.
"Test and Clear the Ethernet Terminal Loopback Circuit" procedure on page
Double-click the intermediate-node card with the terminal loopback to display the card view.
Click the Maintenance > Ethernet > Loopback > Port tabs.
Select None from the Loopback Type column for the port being tested.
Select the appropriate state (Unlocked; Locked,disabled; Locked,maintenance) in the Admin
State column for the port being tested.
Click Apply.
Click Yes in the confirmation dialog box.
Click the Circuits tab.
Choose the loopback circuit being tested.
Click Delete.
Click Yes in the Delete Circuits dialog box. Do not check any check boxes.
"Test the ASAP Card" procedure on page
1-40.
"Replace an I/O Card" procedure on page 2-134
Chapter 1 General Troubleshooting
1-40.
for the
July 2010
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Troubleshooting
