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Chapter 7. Test Menu
7-10 TDU 120e User Manual 61202156L2-1
OFF
The loop is deactivated.
REM V.54 Cont.
The remote loopback causes a continuous V.54 code
to be sent to the far end. The Nx at the far end acti-
vates a PORT/LOCAL loopback upon detection of
the V.54 code.
511 PATTRN
Activates the generation of the 511 test pattern.
ON
The pattern check circuitry is enabled and a test
started. The test is ended by selecting OFF.
OFF
The pattern generation and check is disabled.
511 RESULTS
Displays the results of the 511 test indicated in the 511
option. The results are in the form of the number of errored
seconds. The error count can be cleared by pressing
C
.
DBU LOOPBACK
ON
Initiates a loopback from the DBU towards the exter-
nal DCE.
OFF
Terminates the loopback test.
DBU TEST
This selection is used to force a backup to occur even if a
backup condition does not exist.
The TDU 120e checks the remote loopback activation by detecting a proper
response from the remote end. While waiting for the response, the display shows
Looping. If successful, the display changes to Looped-Up. If unsuccessful, the
display shows Failed.