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Note: This section is out of date and no longer maintained.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.
IDSLIDSL is DSL at 144 kbps. IDSL uses ISDN transmission coding, bundling together both ISDN channels and voice all on one circuit. IDSL does not use any kind of dial up nor involve per-call fees. For those that live too far for regular DSL, IDSL may be the only DSL option. IDSL tends to be priced at a rather higher rate per bit of speed, than any regular DSL. IDSL can still be a very satisfactory solution for data transmission compared to the alternatives (modem), coping very well with online gaming, and medium quality streaming audio/video.
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