Specifications

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Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 2 General Troubleshooting
2.2.3 Using the DS3XM-6 Card FEAC (Loopback) Functions
The DS3XM-6 card supports FEAC (Far End Action Code) features that are not available on basic DS-3
cards. Click the Maintenance tab at the DS3XM-6 card-level view to reveal the two additional DS3XM-6
columns. Figure 2-9 shows the DS3 subtab and the additional Send Code and Inhibit Lbk columns.
Figure 2-9 Accessing FEAC functions on the DS3XM-6 card
The far end in FEAC refers to the piece of equipment that is connected to the DS3XM-6 card and not the
far end of a circuit. In Figure 2-10 below, if a DS3XM-6 (near-end) port is configured to send a Line
Loop Code, the code will be sent to the connected test set, not the DS3XM-6 (far-end) port.
Figure 2-10 Diagram of far end action code
2.2.3.1 FEAC Send Code
The Send Code column on the maintenance tab of a DS3XM-6 port only applies to In-Service ports
configured for CBIT framing. The column lets a user select No Code (the default) or Line Loop Code.
Selecting Line Loop Code inserts a line loop activate FEAC (Far End Action Code) in the CBIT overhead
transmitting to the connected facility. This code initiates a loopback from the facility to the ONS 15454.
Tx
Rx
DS3XM
(Near End)
Tx
Rx
OC48
OC48
Ring
Test Set
Node B
CPE
Rx
Tx
OC48
Tx
Rx
DS3XM
(Far End)
61845