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ADSL stands for Asymmetric Digital Subscriber Line. The ‘asymmetric’ part simply means that you can download over the line faster than you can upload – good for home users, who generally download (get things from the Internet) far more than they upload (send things to it).
It’s the ‘digital’ part that is important, however. If you think back to old dial-up modems, remember the screeching noises they made when they were connecting? That’s because they were encoding the data they sent over the phone line as sound – 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 aren’t needed for voice signals) to carry digital signals, in the form of electrical pulses instead of sound – it’s 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 isn’t that big, but DSL splits it up into many smaller pieces and uses each one separately, allowing multiple ‘channels’ of data to be sent and received at once.
Who said you can’t teach an old dog new tricks?
He is the owner of
adsl tips and guides For more information on adsl check out
www.adsl-guidance1k.info
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