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020709_2.book Page 8 Friday, April 23, 1999 5:39 AM
Issue 2
November 1996
8400B Plus Data Module User’s Guide 555-020-709
Isolating Problems Using Loopback Data Tests
Remote Loopback Test
Local DTE
8400B Plus
Characters
Sent
Transmitter
Characters
Received
Receiver
S
W
I
T
C
H
D-8
Remote
Data Endpoint
Receiver
Remote DTE
Transmitter
Figure D-4. Remote Loopback Test
Performing a Remote Loopback Test
To initiate the test, set up a data call and escape to command mode (+++). Then
type:
AT&T6
ENTER
The system responds with:
OK
This test will continue for the period of time indicated in S-register S18.
To terminate the test before the test timer expires, type:
+++
The system responds with:
OK