What is DSL?
DSL (Digital Subscriber Line) is a technology for bringing high-bandwidth information to homes and small businesses over ordinary copper telephone lines. Digital data is transmitted to your computer directly as digital data instead of being modulated by a modem, and this allows the phone company to use a much wider bandwidth for transmitting it to you.
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Is DSL the same speed for upload as it is for download?
 
No. This depends upon the type of DSL used but RADSL (Rate Adaptive Digital Subscriber Line), the type available currently in our area, is asymmetric, which means that you can transfer data more quickly in one direction (down) than in the other. At 256k, this difference isn't very high, but on the top end they reach a 700% disparity. For example, the maximum transfer rates (if you qualify for them) are 7 Megabit downstream and 1 megabit upstream.
 
This discrepancy illustrates one of the most obvious differences between DSL and frame relay. Obviously, even if you or your company qualifies for the higher bandwidth DSL options, server services over DSL peak at lower upstream rates than frame relay.

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