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Note: This section is out of date and no longer maintained.
It is retained for the value of any residual information contained in it. DSL:2DSL standards are specifically known as SDSL, ADSL, IDSL and a number of less commonly used standards such as HDSL etc. They all work technically in similar ways. The basic principal is to divide up the frequency spectrum that can be carried reliably on twisted pair into two or three bands. One is for upstream traffic, one for down-stream, and the third for some standards is old style voice. Since telephone quality voice represents a fairly small frequency chunk, carrying that capability along with the data is not difficult.
ADSLThe A in ADSL means asymmetric DSL. This recognizes that for home use, since people tend to be more of a consumer of data than a producer, a slower upstream (upload) speed can traded off for a faster downstream (download) speed. In addition, the ADSL standard allows for regular phone service to be squeezed into the low end of the frequency spectrum. ADSL therefore needs a splitter to be placed during installation.
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