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C Loopback Tests
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MultiModemZPX User Guide
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
message. If you wish to stay on line with the remote modem for normal data
transmission, type AT&T and press ENTER to exit the test, then type ATO and
press E
NTER to return on line. If you wish to terminate the call, type ATH and
press ENTER to hang up.