Case Communications Mayze 24, Reference Manual, Page: 91 / 166

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.
The test is only valid if the modem has established a V.22 or V.22bis
connection, without error correction. If one or more of these conditions
does not comply, the modem responds with the message
ERROR
.
1. Ensure that your modem has established a connection with a remote
modem in V.22 or V.22bis mode.
2. Enter the escape sequence command (default +++ ) so that the modem
can accept AT commands. The modem should acknowledge with the
message
OK
.
3. If required, set the test timer with the command
ATS18=n
(
n
= 1 to 255
seconds).
4. Ensure that the remote modem is conditioned to accept an RDL test
( &T4 ).
5. Enter the command
AT&T6
(without self-test) or
AT&T7
(with self-test)
and press
ENTER
.
6. If you selected &T6 (without self-test), you must key in a test message.
This should be echoed back to the screen 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.
7. 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 feature, the error count is also displayed.
If the call is disconnected during the test, the test procedure is terminated.
To transmit data, enter the command ATO , and press
RETURN
. The modem
responds with the message
CONNECT XXXX
. Data can now be transferred.
X460-306851 Issue 1 7-7 Rev.0