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1.2.6 Perform a Hairpin Test on a Destination-Node Electrical Port (East to West)
Resend test traffic on the loopback circuit with known-good cabling, a known-good card, and the
Step 6
replacement FMEC card.
Step 7
If the test set indicates a faulty circuit, repeat all of the facility loopback procedures. If the faulty circuit
persists, contact the Cisco Technical Support. Log into the Cisco Technical Support Website at
http://www.cisco.com/techsupport for more information or log into
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of toll-free Cisco
TAC numbers for your country.
If the test set indicates a good circuit, the problem is probably a defective FMEC card. Clear the facility
Step 8
(line) loopback:
a.
b.
c.
d.
e.
Complete the
Step 9
procedure on page
1.2.6 Perform a Hairpin Test on a Destination-Node Electrical Port (East to
West)
The hairpin test is performed on the cross-connect card in the network circuit. A hairpin circuit uses the
same port for both source and destination. Completing a successful hairpin through the card isolates the
possibility that the cross-connect card is the cause of the faulty circuit.
of a hairpin loopback on a destination-node port.
Figure 1-16
Hairpin on a Destination-Node Port
E1-N
Test Set
The ONS 15454 SDH does not support simplex operation on the XC-VXL cross-connect card. Two
Note
cross-connect cards of the same type must be installed for each node.
Complete the
Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
1-28
Click the Maintenance > Loopback tabs.
Choose None from the Loopback Type column for the port being tested.
Choose the appropriate state (Unlocked; Locked,disabled; Unlocked,automaticInService) from the
Admin State column for the port being tested.
Click Apply.
Click Yes in the confirmation dialog box.
"1.2.6 Perform a Hairpin Test on a Destination-Node Electrical Port (East to West)"
1-28.
Source
ONS Node
XC
STM-N
"Create the Hairpin Circuit on the Destination-Node Port" procedure on page
Intermediate
ONS Node
E1-N
XC
STM-N
Chapter 1
General Troubleshooting
Figure 1-16
shows an example
Destination
ONS Node
E1-N
XC
STM-N
1-29.
July 2005
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