Case Communications syncro 1496, Reference Manual

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7.4.2 Remote Digital Loopback
This test checks the local DTE, the local modem, the remote modem, and
the telephone line. It can be used with, or without, the modem's self-test
feature.
1. Ensure that your modem has established a connection with a remote
modem.
2. If required, set the test timer with the command ATS18=n ( n = 1 to 255
seconds).
3. Ensure that the remote modem is conditioned to accept an RDL test
( &T4 ).
4. Enter the command AT&T6 (without self-test) or AT&T7 (with self-test)
and press
ENTER
.
5. If you selected
&T6
(without self-test), you must transmit a test message.
This should be echoed back via the remote modem's digital loopback
connection.
If you selected &T7 (with self-test), the test sequence is automatic and
the circuit is checked for errors. Errors may be injected with the
command
AT&T99 .
6. 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 feature, the error count is also displayed.
If the call is disconnected during the test, the test procedure is terminated.
X450-310851 Issue 2 7-7 Rev.0