Appendixes

Appendix C: Loopback Tests

Introduction

Each time you turn on your modem, it performs an automatic self-test to ensure proper operation.

Your modem also has three diagnostic tests: local analog loopback, remote digital loopback, and

local digital loopback. These ITU-T V.54 loopback tests isolate telephone circuit and transmission

problems.

In a loopback test, data from your computer loops through the circuits of your modem and/or a

remote modem before it appears on your monitor. When the loop has been completed, the data on

your PC’s monitor should match the original data.

The local analog loopback test allows you to verify that the modem’s transmitter and receiver circuits

are functioning properly.

The local digital loopback allows you to verify that the local computer or terminal, the two modems,

and the transmission line between them are functioning properly.

The remote digital loopback test allows you to verify that the remote computer or terminal, the remote

modem, the serial ports, the telephone line, and the local modem are functioning properly.

Note: All loopback tests operate at all speeds except 300 bps.

Local Analog Loopback Test (V.54 Loop 3)

In this test, data from your computer or terminal is sent to your modem’s transmitter, converted into

analog form, looped back to the modem’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 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.

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 66 67

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Table des matières

PARTS CATALOG

NUMERICAL INDEX

MF4140/MF4120(Parts Catalog)

Satera MF4130

Satera MF4120

Contents

FIGURE A

ASSEMBLY LOCATION DIAGRAM

FIGURE 001

ACCESSORIES

EXTERNAL COVERS, PANELS, ETC

FIGURE 100

FIGURE 101

INTERNAL COMPONENTS 1

FIGURE 102

INTERNAL COMPONENTS 2

FIGURE 103

INTERNAL COMPONENTS 3

FIGURE 104

BASE PLATE ASS'Y

FIGURE 310

PAPER PICK-UP ASS'Y

FIGURE 400

READER ASS'Y

FIGURE 810

FIXING ASS'Y

FIGURE A10

ADF ASS'Y (MF4150/4130)

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