VoIPMaster 260W

What is How does it work?

Question

Answer

 

 

What is How does it

Many years ago we discovered that sending a signal to

work?

a remote destination could have be done also in a digital

 

fashion: before sending it we have to digitalize it with an

 

ADC (analog to digital converter), transmit it, and at the

 

end transform it again in analog format with DAC (digital

 

to analog converter) to use it.

 

VoIP works like that, digitalizing voice in data packets,

 

sending them and reconverting them in voice at

 

destination.

 

Digital format can be better controlled: we can compress

 

it, route it, convert it to a new better format, and so on;

 

also we saw that digital signal is more noise tolerant

 

than the analog one (see GSM vs TACS).

 

TCP/IP networks are made of IP packets containing a

 

header (to control communication) and a payload to

 

transport data: VoIP use it to go across the network and

 

come to destination.

 

Voice (source) -- ADC ---- Internet --- DAC -- Voice

 

(dest)

 

 

What is VoIP What is the advantages using VoIP rather PSTN?

Question

 

 

Answer

 

 

 

 

What

is

the

When you are using PSTN line, you typically pay for

advantages

using

time used to a PSTN line manager company: more time

VoIP rather PSTN?

you stay at phone and more you'll pay. In addition you

 

 

 

couldn't talk with other that one person at a time.

 

 

 

In opposite with VoIP mechanism you can talk all the

 

 

 

time with every person you want (the needed is that

 

 

 

other person is also connected to Internet at the same

 

 

 

time), as far as you want (money independent) and, in

 

 

 

addition, you can talk with many people at the same

 

 

 

time.

 

 

 

If you're still not persuaded you can consider that, at the

 

 

 

same time, you can exchange data with people are you

 

 

 

talking with, sending images, graphs and videos.

 

 

 

 

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