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Isolating Problems Using Loopback Data Tests
D-2 Issue 2 November 1996
Figure D-1. Data Loopback Test
Performing a Data Loopback Test
To initiate the test, set up a data call and escape to command mode (+++). Then
type:
AT&T3
The system responds with:
OK
The remote endpoint user types characters (which will not appear on your
screen) and will call you on another line to inform you of the test results. This
test will continue for the period of time indicated in S-register S18.
If the remote endpoint user tells you to terminate the test before the period of
time indicated in S-register S18, type:
AT&T0
Local DTE
Data Received
8400B Plus
Remote
Data Endpoint
Remote DTE
Transmitter
TransmitterReceiver
Receiver
Data Sent
S
W
I
T
C
H
ENTER
ENTER