Multi-Tech Systems MT5600DSVD - Manual (Page 72)

MultiModemDSVD User Guide C Loopback Tests
67
3. Type the escape sequence +++AT and press E NTER to bring your modem into
online command mode.
4. Type AT&T3 and press E
NTER
. 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 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 characters re-
ceived on the remote monitor are the same as those entered from the remote
keyboard.
6. To exit the test, turn off the modems.