Multitech MT3334HD8 Guida Utente Scaricare il pdf (Pagina 61)

100

5 Testing the MT3334HD8

CommPlete Communications Server 55

3. Note that the CD LED is on. If you’re set for 14,400 bps or higher, the 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 U characters is a good

way to send an alternating test pattern of binary ones and zeros. The characters entered should be

displayed on your monitor. The TD and RD LEDs should flash when a character is entered.

5. For a more complete test, you should also test the modem in answer mode. To do this, you must first

terminate the originate mode by entering an escape sequence (+++AT<CR> or

<BREAK>AT<CR>). An OK should appear on your display. Then type ATU1 and press E

NTER to

place the modem in analog loopback in answer mode.

6. Note that the CD LED is on. If you’re set for 14,400 bps or higher, the Speed LED should be on. If the

CD LED is not on, there is a defect in your modem.

7. Enter characters from your keyboard. Type multiple uppercase U characters to send an alternating

test pattern of binary ones and zeros. The characters entered should be displayed on your monitor.

The TD and RD LEDs should flash when a character is entered.

8. To exit the test, enter an escape sequence (+++AT<CR> or <BREAK>AT<CR>), which returns the

modem to command mode.

9. Your modem passes this test if the data received on your monitor are the same as the data entered

from your keyboard. If different data appear on your monitor, your modem is probably causing the

problem, though it could also be your computer. If your modem passes this test, but you are

receiving errors while on line, the remote modem or the phone line could be at fault.

Remote Digital Loopback Test (V.54 Loop 2)

In this test, your modem must be online with another modem, such as another ZDX, that is set up to

respond to a request for remote digital loopback. With the ZDX, this ability to respond is controlled by the

&T command. AT&T4 enables the response to remote digital loopback; AT&T5 disables the response. The

modem defaults to &T5 on power-up, so this must be changed on the remote modem before initiating

remote digital loopback.

Initiate remote digital loopback with the ATU2 command, which places the remote modem in digital

loopback mode. Data from your computer or terminal are transmitted through your modem and over the

phone line to the remote modem, where they are then looped back to your modem. See Figure 3.

Computer or Terminal

UUUUU

Type AT in terminal mode; hit

ENTER; dial remote modem;

establish online mode; enter

escape sequence; type ATU2

and hit ENTER

Local MultiModem Remote MultiModem Computer or Terminal

Digital Analog DigitalAnalog

Figure 3. Remote digital loopback test.

Test procedure

1. Arrange to have &T4 set on the remote test modem.

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Lg CT-29K37E Manuel de l'utilisateur (28 pages)

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Table des matières

Television

Contents

Installation

Location

Brightness

Equalizer

MoveOOOOOSkip

Kong/South

Europe/China/Africa/CIS)

(USA/Korea/Philippines)

ProgrammeOedit

Programme

Selecting

(option)

ChildOlock

S-VIDEO VIDEO

S-VIDEO VIDEO L/MONO

Troubleshooting

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