Case Communications syncro 1496, Reference Manual

Page: 92 / 192

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 transmit a test message.
This should be echoed back 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. Errors may be injected with the
command
AT&T99
.
5. To terminate the test manually, enter the command
AT&T0
and press
RETURN
. The modem responds with the message OK .
If you had selected the self-test procedure, the error count is also
displayed.
X450-310851 Issue 2 7-6 Rev.0