Loopback Tests - Multitech MultiModem MT5600ZDX User Manual

Data/fax modem and voice/data/fax modem

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Test Procedure

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

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

3. Type the escape sequence +++AT and press E

4. Type AT&T3 and press E

5. Have someone enter data from the remote keyboard. For this test, typing multiple

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

press E

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

NTER

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.

online command mode.

modem (if responses are enabled), your modem is placed in digital loopback

mode.

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.

NTER

. Once you receive an OK message from your

NTER

C Loopback Tests

NTER

to bring your modem into

Table of Contents

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