Cisco ONS 15454 SDH - Perform a Facility (Line) Loopback on a Source-Node MXP;TXP;FC_MR Port

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Cisco ONS 15454 SDH Troubleshooting Guide, R5.0
July 2005
Chapter 1 General Troubleshooting
1.5.1 Perform a Facility (Line) Loopback on a Source-Node MXP/TXP/FC_MR Port
You can use these procedures on transponder cards (TXP, TXPP), muxponder cards (MXP, MXPP), and
FC_MR-4 cards. The example in this section tests a circuit on a three-node MS-SPRing. Using a series
of facility (line) loopbacks, hairpin circuits, and terminal (inward) loopbacks, the example scenario
traces the circuit path, tests the possible failure points, and eliminates them. The logical progression
contains six network test procedures:
1. A facility (line) loopback on the source-node MXP/TXP/FC_MR port
2. A terminal (inward) loopback on the source-node MXP/TXP/FC_MR port
3. A facility (line) loopback on the intermediate-node MXP/TXP/FC_MR port
4. A terminal (inward) loopback on the intermediate-node MXP/TXP/FC_MR port
5. A facility (line) loopback on the destination-node MXP/TXP/FC_MR port
6. A terminal (inward) loopback on the destination-node MXP/TXP/FC_MR port
Note Loopbacks are not available for DWDM cards in this release.
Note MXP and TXP card client ports do not appear in the Maintenance > Loopback tab unless they have been
provisioned. Do this in the card view Provisioning > Pluggable Port Modules tab. For information and
guidance about provisioning client ports, refer to the Cisco ONS 15454 DWDM Installation and
Operations Guide.
Note The test sequence for your circuits will differ according to the type of circuit and network topology.
Note Facility, hairpin, and terminal loopback tests require on-site personnel.
1.5.1 Perform a Facility (Line) Loopback on a Source-Node MXP/TXP/FC_MR
Port
The facility (line) loopback test is performed on the node source port in the network circuit. In the testing
situation used in this example, the source muxponder or transponder MXP/TXP/FC_MR port in the
source node. Completing a successful facility (line) loopback on this port isolates the
MXP/TXP/FC_MR port as a possible failure point. Figure 1-34 shows an example of a facility loopback
on a circuit source MXP/TXP/FC_MR port.