Feac Send Code; Wbe-28/Wbe-84 Inhibit Feac Loopback; Troubleshooting Ethernet Circuit Paths With Loopbacks - Cisco ONS 15310-CL Troubleshooting Manual

Chapter 1 General Troubleshooting
The term "Far End" refers to the equipment connected to the WBE card and not to the far end of a circuit.
Note

1.5.1 FEAC Send Code

The Send Code column on the WBE-28/WBE-84 card Maintenance tab only applies to OOS-MA,MT
ports configured for ESF framing. The column lets a user select No Code (the default) or line loop code.
Selecting line loop code inserts a line loop activate Far End Loopcode in the ESF overhead transmitting
to the connected facility. This code initiates a loopback from the facility to the ONS 15454. Selecting
No Code sends a line-loop-deactivate Far End Loopcode to the connected equipment, which will remove
the loopback.

1.5.2 WBE-28/WBE-84 Inhibit FEAC Loopback

WBE-28/WBE-84 DS1 ports initiate loopbacks when they receive Far End line loop codes. If the Inhibit
FE Lbk check box is checked for a DS1 port, that port ignores any Far End line loop codes it receives
and will not loop back. If you inhibit a DS1 port's far end loopback response, this DS1 port is not
restricted from terminal or facility loopbacks.

1.6 Troubleshooting Ethernet Circuit Paths With Loopbacks

Facility loopbacks, terminal loopbacks, and cross-connect loopback circuits are often used together to
test the circuit path through the network or to logically isolate a fault. Performing a loopback test at each
point along the circuit path systematically isolates possible points of failure.
When performing this testing on networks that contain intermediate nodes, you will test the OC-N
connection at intermediate nodes rather than CE100T-8 card connections. (The CE100T-8 is a mapper
card and is only capable of supporting point-to-point circuits.)
You can use these procedures on CE100T-8 cards but not on ML-100T-8 Ethernet cards. 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:
Note The test sequence for your circuits will differ according to the type of circuit and network topology.
1.
2.
3.
4.
5.
6.
Facility and terminal loopback tests require on-site personnel.
Note
78-17235-01
A facility loopback on the source-node Ethernet port
A terminal loopback on the source-node Ethernet port
A facility loopback on the intermediate-node OC-N port
A terminal loopback on the intermediate-node OC-N port
A facility loopback on the destination-node Ethernet port
A terminal loopback on the destination-node Ethernet port
Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
1.5.1 FEAC Send Code
1-27