Multitech MT5634ZBAV Uživatelská příručka stáhnout pdf (Strana 142)

User Guide

132

Local Analog Loopback Test (V.54 Loop 3)

In this test, data from your computer or terminal is sent to your mo-

dem’s transmitter, converted into analog form, looped back to the mo-

dem’s receiver, converted into digital form, and then sent to your

monitor for verification. No connection to the phone line is required.

Computer or Terminal Local MultiModem

Digital Analog

AT&T1

CONNECT

UUUUUUUUU

UUU

Figure C-1. Local analog loopback test.

Test procedure

1. Connect the modem to your computer. Using your communication

program, set the desired baud rate and go into terminal mode.

2. Type AT&T1 and press ENTER. This places your modem in analog

loopback mode in the originate mode. A

CONNECT

message should

appear on your display. The modem is now out of command mode

and in a pseudo-online mode.

3. Note that the CD LED is on. If you are set for 14,400 bps or higher,

a speed LED should be on. If the CD LED is not on, there is a defect

in your modem.

4. Enter characters from your keyboard. For this test, typing multiple

uppercase

characters is a good way to send an alternating test

pattern of binary ones and zeros. The characters entered should be

1 2 ... 137 138 139 140 141 142 143 144 145 146 147 ... 169 170

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Multitech MT5634ZBAV Uživatelská příručka Strana 142