ATech Machine LIBRA-02 M Technické informace stáhnout pdf (Strana 653)

APPENDIX B

Protocols for VoIP

The Internet is a telephone system that’s gotten uppity.

—Clifford Stoll

The telecommunications industry spans over 100 years, and Asterisk integrates most—

if not all—of the major technologies that it has made use of over the last century. To

make the most out of Asterisk, you need not be a professional in all areas, but under-

standing the differences between the various codecs and protocols will give you a

greater appreciation and understanding of the system as a whole.

This appendix explains Voice over IP and what makes VoIP networks different from

the traditional circuit-switched voice networks that were the topic of Appendix A. We

will explore the need for VoIP protocols, outlining the history and potential future of

each. We’ll also look at security considerations and these protocols’ abilities to work

within topologies such as Network Address Translation (NAT). The following VoIP

protocols will be discussed (some more briefly than others):

• IAX

• SIP

• H.323

• MGCP

• Skinny/SCCP

• UNISTIM

Codecs are the means by which analog voice can be converted to a digital signal and

carried across the Internet. Bandwidth at any location is finite, and the number of

simultaneous conversations any connection can carry is directly related to the type of

codec implemented. We’ll also explore the differences between the following codecs

in regard to bandwidth requirements (compression level) and quality:

• G.711

• G.726

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Whirlpool MT8066SE Manuale Utente (48 pagine)

Marchio: Whirlpool | Categoria: Microwaves | Dimensione: 1.76 MB |

Inglese

Indice

Use And Care

1

Table of Contents

2

A Note to You

3

Microwave Oven Safety

4

PRECAUTIONS TO AVOID

5

POSSIBLE EXPOSURE TO

5

EXCESSIVE MICROWAVE ENERGY

5

Installation Instructions

6

GROUNDING INSTRUCTIONS

7

Getting to Know Your

8

Microwave Oven

8

Glass turntable

9

For the best cooking results

10

Radio interference

10

Testing your microwave oven

10

Operating safety precautions

11

Electrical connection

13

Microwave oven features

14

Control panel features

15

Interrupting cooking

16

Audible signals

16

Setting the clock

17

Using the minute timer

18

Using ADD MINUTE

19

Using Your Microwave Oven

20

USING YOUR MICROWAVE OVEN

21

2. Set the cooking time

22

3. Set the cook power

22

(cooking time counts

23

(example for 50%

23

(Start? indicator light

24

Using BAKED POTATOES

25

4. Start the oven

26

Using BEVERAGE

27

Using POPCORN

28

Using FROZEN ENTREE

29

Using DEFROST

30

Defrosting tips

31

Using REHEAT

32

Reheating tips

33

Using BREAKFAST

33

BREAKFAST

33

Using VEGETABLES

34

VEGETABLES

34

Caring for Your Microwave

35

Cooking Guide

36

Arranging food

37

Using aluminum foil

37

Cooking you should not do in

37

COOKING GUIDE

37

Questions and Answers

38

Troubleshooting

39

TROUBLESHOOTING

40

Requesting Assistance or

41

Authorized Service Centres

43

WHIRLPOOL

48

Microwave Oven Warranty

48

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