When was DSL invented? What sort of bugs had to be worked out of the technology for it to function as it does today?
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YupYup84
ANSWERS: 1
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DSL was invented by Bellcore in the 80's, but it wasn't really needed until the 90s when the Internet took off. The attraction of DSL is that it's data-specific. It doesn't convert digital data to analog to move it over an analog telephone system. It stays digital over the analog system and allows the user to use the voice function of their phone line at the same time as using the data function of their phone line. This is done by allocating a frequency range on the phone line for data. This was a major advancement in data transmission. It allowed the phone company to stay on top of the service provision game by the use of their existing copper lines to the customers' door. They didn't have to create new infrastructure. In a nutshell, they only had to add equipment to their switching stations. The copper was already in place and had been for years. The main problem with DSL was and is distance. It is quite limited. My numbers are rusty, but I believe you have to be within 1000' of the nearest repeater to get a DSL signal. Attenuation is just too great beyond that distance for the datarate to be considered 'effective'.
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