Integrated Services Digital Network , Basically a way to move more data over existing regular phone lines.
ISDN is rapidly becoming available to much of the USA and in most markets it is priced very comparably to standard analog phone circuits.
It can provide speeds of roughly 128,000 bits-per-second over regular phone lines. In practice, most people will be limited to 56,000 or 64,000 bits-per-second.
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