MessageSaver User Guide
4.Type AT&T3 and press ENTER. Once you receive an OK message from your mo- dem (if responses are enabled), your modem is placed in digital loopback mode.
5.Have someone enter data from the remote keyboard. For this test, typing multi- ple uppercase U characters is a good way to send an alternating test pattern of binary ones and zeros. The data received by your modem enters its analog re- ceiver, is converted to digital data, is reconverted into analog, and then is trans- mitted back to the remote modem. Your modem passes this test if the data received on the remote monitor is the same as the data entered from the remote keyboard.
6.To exit the test, type the escape sequence +++AT and press ENTER. This puts the modem in online command mode. The modem should respond with an OK mes- sage. If you wish to stay on line with the remote modem for normal data trans- mission, type AT&T and press ENTER to exit the test, then type ATO and press ENTER to return on line. If you wish to terminate the call, type ATH and press ENTER to hang up.
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