Multi-Tech Systems MT5600ZDX ユーザーズマニュアル

1. Open your communications software and go into terminal mode. Type AT and

press E

NTER

; you should get an OK message. Type AT\N and press E

NTER

 to

disable error correction. Type AT+MS=9,1,9600,9600 and press Enter to set the
local modem to V.32 mode at 9600 bps.

2. Dial the remote modem and establish your online connection.

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

modem (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 data received on
the remote monitor is the same as the data entered from the remote keyboard.

6. To exit the test, turn off the modem.