quote:
Originally posted by traxor
its a v. good deal... you do not have to connect, there is just a modem -
(it should be called a modem though because modems modulate then demodulate, but broadband is digital information, and therefore does not need demodulating.... do you get me??) - and its always on, so you never have to dial up agen 
, there is never really any downtime
you wrong, traxor...
in fact, as you said, modems modulate and demuluate a signal that means that they transform a signal into an other with a technique called modulation.
Both ADSL and Dial-up modems are modems (
), I mean, they modulate and demodulate a signal. In both cases, the sent-received signal is an
analogic one.
The difference between both signals is in their frequences. Dial-up signals are in the range 300-3300 Hz (the same used by the human voice in telephonic calls (that's why you can't use at the same time a dial-up internet connection and make a phone call)). ADSL signal frequences are bigger than 3300 Hz and that implies 2 things: You have the 300-3300 Hz band free, so you can make a phone call at the same time you're surfing the net and you have a wider range (from a bit more than 3300 Hz to .... (a high value, I can't remember)). With that wider range of frequences you can get higher speeds.
About what you said about you have to dial-up or not etc...: With a 56 Kbps modem you have to dial-up because your ISP has to distinguish when you want to make a standar phnoca call or connect to the Internet. So you dial a number and when that number "answers", it and the modem follow a protocol that can decide the connection speed, etc... and it distinguish it from a standar call.
With ADSL, there's no need of dialing up, because there's no other (not exactly true) thing that can use the same band of frequences. However, even if you don't notice it, there's a protocol similar to the dial-up one that is done before you connect to the internet.
Simarizing: Both dial-up and ADSL transmit (send & receive) digital information. Both modulate before sending and demodulate after receiving that information. Both module that info into an analogic signal. The diference is in the way of modulating the information (the algorithm used to modulate and the range of frequences that has the modulated signal).
quote:
Originally posted by Kryptonate
ADSL: 3,3 Mbps; 29€/month, you can download 10GB.
how do they know the ammount of data downloaded? what would happen if you download more than 10 Gb? Are you sure they apply that limit?
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