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7.4 Testing by Command
The following commands are available for testing:
&T
Select modem test operation
/T
Test pattern
&B
Delay busying
I
Display modem identity codes
7.4.1 Local Analogue Loopback
This procedure tests connections between the local DTE and local modem.
It can be used with, or without, the modem's self-test feature.
1. Ensure that the modem can accept
AT
commands and is on-hook.
2. If required set the test timer with the command
ATS18=n
(
n
= 1 to 255
seconds).
3. Enter the command
AT&T1
(without self-test) or
AT&T8
(with self-test),
and press
RETURN
.
4. If you selected
&T1
(without self-test), you must key in a test message.
This should be echoed back to the screen via the modem's analogue
loopback connection.
If you selected
&T8
(with self-test), the test sequence is automatic and
the circuit is checked for errors.
5. To terminate the test manually, first enter the escape sequence (default
+++
) if you are using the main DTE for commands. The modem
responds with the message
OK
.
Now enter the command
AT&T0
, and press
RETURN
. The modem again
responds with the message
OK
.
If you had selected the self-test procedure, the error count is also
displayed.
X460-306851 Issue 1
7-6
Rev.0
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