Multi-Tech Systems MT5634ZBAV - Manual (Page 146)

User Guide
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5. Have someone enter data from the remote keyboard. For this test,
typing multiple 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 receiver, is converted to digital
data, is reconverted into analog, and then is transmitted 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 EN-
TER. 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 ENTER to
return on line. If you wish to terminate the call, type ATH and press
ENTER to hang up.