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Managing and Troubleshooting the Versalar Switch Router 15000
6-12
302768-C Rev 00
Selecting a Loopback Code to Send to a Remote Device
To select a far-end alarm and control channel code (FEAC) for the remote end of 
the test connection, go to the t3-test prompt (for example, 
t3-test/2/1
) and enter 
the following command:
send-feac-loop-code <
action>
action
 is one of the following:
no-action
 (the default setting) does not send code to the remote end. 
lineloop
 bypasses the framing device and passes code directly through the 
loop. 
deactivatell
 disables generation of line loopback code.
payloadloop
 sends a loop-up signal to the remote end to initiate payload 
loopback. The signal loops through the framing device before the received 
signal is looped back for retransmission.
deactivatepl
 sends a loop-down code to the remote end to stop payload 
loopback.
The following example shows how to start and stop payload loopback over the 
FT3 interface on slot 2, connector 1, T1 channel 4:
t3-test/3/1# 
send-feac-loop-code payloadloop
t3-test/3/1# 
send-feac-loop-code deactivatepl
t3-test/3/1#
Starting or Stopping Loopback Mode on a Remote Device
To start or stop an FT3 loopback test, go to the t3-test prompt (for example, 
t3-test/2/1
) and enter the following command:
send-feac-loop-{up 
|
 down}-code {no-action 
|
 <
timeslot>}
up
 sends a loop-up signal to start a loopback test.
down
 sends a loop-down signal to stop a loopback test.
no-action
 (the deafult setting) indicates no loopback signal. 
timeslot
 is a timeslot from 1 to 24 on which to send the loopback initialization or 
termination signal.