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C Loopback Tests
37
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 should be run at 9600 bps without error correction.
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
Digital Analog
AT&T1
CONNECT 9600
UUUUUUUUUUU
UUU
Local MultiModem
Figure C–1. Local analog loopback test.
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Silvercrest SEM 250 A1 manuels

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Table des matières

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1

ID: SEM-250-A1_11_V1.0

2

Prehad / Übersicht

3

Contents

4

Overview

4

1. Safety information

5

2. Items supplied

6

3. Fitting and removing

6

4. Operation

6

5. Cleaning

7

6. Disposal

7

7. Troubleshooting

8

8. Technical

8

9. Warranty

9

Przegld

10

1. Wskazówki

11

2. Zakres dostawy

12

3. Monta i demonta

12

4. Obsuga

13

5. Czyszczenie

13

6. Utylizacja

14

7. Rozwizywanie

14

8. Dane techniczne

15

9. Gwarancja

15

Áttekintés

16

1. Biztonsági utasítások

17

2. A csomag tartalma

18

3. A pengék fel- és

18

4. Kezelés

18

5. Tisztítás

19

6. Eltávolítás

19

7. Problémamegoldás

20

8. Mszaki adatok

20

9. Garancia

20

1. Varnostna navodila

23

2. Obseg dobave

24

3. Montaža in demontaža

24

4. Uporaba

24

5. išenje

25

6. Odstranjevanje med

25

7. Reševanje problemov

26

8. Tehnini podatki

26

9. Garancija

27

1. Bezpenostní pokyny

29

2. Rozsah dodávky

30

3. Montáž a demontáž

30

4. Ovládání

30

5. ištní

31

6. Likvidace

31

7. ešení problém

32

8. Technické parametry

32

9. Záruka

32

1. Bezpenostné pokyny

35

4. Obsluha

36

5. istenie

37

6. Likvidácia

37

7. Riešenia problémov

38

8. Technické údaje

38

Übersicht

40

1. Sicherheitshinweise

41

2. Lieferumfang

42

3. Montage und

42

Demontage der Klingen

42

4. Bedienung

42

5. Reinigen

43

6. Entsorgen

44

7. Problemlösungen

44

8. Technische Daten

45

9. Garantie

45

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