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1.3.6 Perform a Terminal Loopback on a Destination-Node Ethernet Port
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.
Caution
Removing a card that currently carries traffic on one or more ports can cause a traffic hit. To avoid this,
perform an external switch if a switch has not already occurred. See the procedures in the
"2.8.2 Protection Switching, Lock Initiation, and Clearing" section on page
information, refer to the "Maintain the Node" chapter of the Cisco ONS 15600 SDH Procedure Guide.
Resend test traffic on the loopback circuit with a known-good card installed.
Step 5
If the test set indicates a good circuit, the problem was probably the defective card. Return the defective
Step 6
card to Cisco through the RMA process. Contact Cisco Technical Support (1 800 553-2447).
Complete the
Step 7
Clear the facility loopback on the port:
Step 8
a.
b.
c.
d.
e.
Clear the loopback circuit:
Step 9
a.
b.
c.
d.
Step 10
Complete the
page
1.3.6 Perform a Terminal Loopback on a Destination-Node Ethernet Port
The terminal loopback at the destination-node ASAP card Ethernet port is the final local hardware error
elimination in the circuit troubleshooting process, and is performed on the destination-node ASAP card
Ethernet port. If this test is completed successfully, you have verified that the circuit is good up to the
destination port. The example in
port.
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
1-44
"Replace an I/O Card" procedure on page 2-134
Click the Maintenance > Ethernet > Loopback > Port tabs.
Choose None from the Loopback Type column for the port being tested.
Choose the appropriate state (Unlocked; Locked,disabled; Locked,maintenance) from 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.
"1.3.6 Perform a Terminal Loopback on a Destination-Node Ethernet Port" procedure on
1-44.
"Replace an I/O Card" procedure on page 2-134
Figure 1-17
shows a terminal loopback on a destination-node Ethernet
Chapter 1 General Troubleshooting
2-123. For more
for the faulty card.
for the
July 2010
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Troubleshooting
