For several years, a new and revolutionary method has prevailed for the transmission of data between computers over the Internet: DSL. The acronym is derived from the English term Digital Subscriber Line, which would go with English so the glory in the wrong country because it would mean the American, because it was so developed in the U.S. At the beginning of the procedure had been designed to help universities and companies need to transfer large amounts of data to facilitate the life of something. This technology then took the same development path as the Internet itself: Science – Economics – population. Is surprising, worked just like the Internet itself, that the military sector was hardly involved and is: Even today, for example in the army with field analog phones and hand radios.
Apparently there is still the familiar analog technology more than the digital. What is very surprising but, as with the conventional technique only a small frequency range is used and need the data much more time before they are transmitted. It is also in the new method, at least in the asymmetric shape, short lead ADSL possible parallel to surfing the Internet telephone calls. In the beginning it was necessary to be able to use DSL, simultaneously, a digital telephone connection set up. This is not so, because you can relate also recently DSL over an analog connection, which contributes to further spread, as now customers in areas without ISDN connection can be achieved. The newest trend is the inflation of the bandwidth: In the beginning was DSL-1000 standard there is now a charge for a tolerable range extension to the 16-fold.