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Letís learn a little about how ADSL works

ADSL is a kind of broadband Internet connection that you can get over your existing phone line. When people hear about this, they often wonder how on earth it can be true. Doesnít the phone line need to be upgraded? How can all that extra data fit through an ordinary phone line? Why werenít they doing this years ago, when I was still dialling up with my old modem? To understand the answers to these questions, itís necessary to learn a little about how ADSL works.

ADSL stands for Asymmetric Digital Subscriber Line. The Ďasymmetricí part simply means that you can download over the line faster than you can upload Ė good for home users, who generally download (get things from the Internet) far more than they upload (send things to it).

Itís the Ďdigitalí part that is important, however. If you think back to old dial-up modems, remember the screeching noises they made when they were connecting? Thatís because they were encoding the data they sent over the phone line as sound Ė all those ones and zeros were becoming a series of sounds. It was an analogue to digital to analogue conversion at each end, and was wildly inefficient.

What DSL does is use the unused frequencies of the phone line (that is, the parts that arenít needed for voice signals) to carry digital signals, in the form of electrical pulses instead of sound Ė itís a successor to ISDN, the expensive business precursor of the technology. This method is much, much faster than the old analogue way. The unused part of the line isnít that big, but DSL splits it up into many smaller pieces and uses each one separately, allowing multiple Ďchannelsí of data to be sent and received at once.

Who said you canít teach an old dog new tricks?


About the Author: John Gibb is the owner of adsl tips and guides
For more information on adsl check out http://www.adsl-guidance1k.info




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