Figure 12-15 Hairpin On A Destination Node Xtc Card - Cisco ONS 15327 User Documentation

Network Test Procedures
c.
d.
If the test set indicates a good circuit, the original XTC card may have had a temporary problem that was
Step 4
cleared by the side switch.
a.
b.
12.10.3 Perform a Hairpin on a Destination Node XTC Card
The third test is a hairpin circuit on the XTC card in the destination node. To perform this test, you must
also create a bidirectional circuit from the source MIC card to the source OC-N node in the transmit
direction. Creating the bidirectional circuit and completing a successful hairpin eliminates the
possibility that the source and destination OC-N cards, the source and destination XTC cards, or the fiber
span is responsible for the faulty circuit.

Figure 12-15 Hairpin on a destination node XTC card

Test Set A
Procedure: Create the Hairpin Loopback Circuit on the Destination Node XTC Card
Step 1 Connect an electrical test set to the port you are testing.
Use CTC to set up the source loopback circuit on the port being tested.
Step 2
Step 3 Use CTC to set up the destination loopback circuit on the port being tested.
Note
For example in a typical east-to-west slot configuration, a slot 1 (east) OC-N card on the source node is
one end of the fiber span, and the slot 2 (west) OC-N card on the destination node is the other end.
Verify that the circuits connect to the correct slots. For example, source node/Slot 1 OC-N card (east
Step 4
slot) to destination node/Slot 2(west slot). If two east slots or two west slots are connected, the circuit
will not work. Except for the distinct slots, all other circuit information, such as ports, should be
identical.
Cisco ONS 15327 User Documentation, R3.3
12-26
Clear the loopback circuit before testing the next segment of the network circuit path.
Proceed to the "Perform a Hairpin on a Destination Node XTC Card" procedure on page
Clear the loopback circuit before testing the next segment of the network circuit path.
Proceed to the "Perform a Hairpin on a Destination Node XTC Card" procedure on page
ONS 15327
Bidirectional
Source
circuit
XTC
DS-N
MIC
DS-N
The destination loopback circuit on a port is a one-way test.
Unidirectional
circuit
Slot 1 Slot 2
OC-N
OC-N
Slot 2 Slot 1
Chapter 12
ONS 15327
Destination
Hairpin
XTC
OC-N MIC
Maintenance
12-26.
12-26.
June 2002