isolates possible points of failure. MXP, TXP, XP, or ADM-10G card loopback tests differ from other testing
in that loopback testing does not require circuit creation. MXP, TXP, and XP client ports are statically mapped
to the trunk ports so no signal needs to traverse the cross-connect card (in a circuit) to test the loopback.
You can use these procedures on transponder cards (TXP, TXPP, ADM-10G), muxponder, or xponder cards
(MXP, MXPP, XP, ADM-10G) cards. The example in this section tests an MXP or TXP circuit on a three-node
bidirectional line switched ring (BLSR) or multiplex section-shared protection ring (MS-SPRing). Using a
series of facility loopbacks and terminal loopbacks, the example scenario traces the circuit path, tests the
possible failure points, and eliminates them. The logical progression contains six network test procedures:
MXP, TXP, XP, or ADM-10G card client ports do not appear when you click the
Maintenance > Loopback
tab unless they have been provisioned. Do this in the card view by clicking the
Provisioning > Pluggable
Port Modules tab.
Note
The test sequence for your circuits will differ according to the type of circuit and network topology.
Note
1.
A facility loopback on the source-node MXP, TXP, XP, or ADM-10G port
2.
A terminal loopback on the source-node MXP, TXP, XP, or ADM-10G port
3.
A facility loopback on the intermediate-node MXP, TXP, XP, or ADM-10G port
4.
A terminal loopback on the intermediate-node MXP, TXP, XP, or ADM-10G port
5.
A facility loopback on the destination-node MXP, TXP, XP, or ADM-10G port
6.
A terminal loopback on the destination-node MXP, TXP, XP, or ADM-10G port
Facility and terminal loopback tests require on-site personnel.
Note
Perform a Facility Loopback on a Source-Node MXP or TXP Port
This facility loopback test is performed on the node source port in the network circuit. In the testing situation
used in this example, the source muxponder, transponder, xponder, or ADM-10G port under test is located
in the source node. Facility loopback can be performed at the trunk port or at a client port. Completing a
successful facility loopback on this port isolates the source MXP, TXP, XP, or ADM-10G port as a possible
failure point.
Figure 3: Facility Loopback on a Circuit Source MXP or TXP Port, on page 9
shows the facility
loopback examples on source ONS node TXP ports (client and trunk).
Cisco NCS 2000 series Troubleshooting Guide, Release 11.0
8
General Troubleshooting
Perform a Facility Loopback on a Source-Node MXP or TXP Port