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A symmetric Digital Subscriber Line (ADSL) works by pumping high bandwidth through normal phone lines.
Sound familiar? It's exactly the same thing promised by another service known mostly by its acronym -ISDN.
ADSL outstrips ISDN for sheer bandwidth, offering 6.1 44M bit/sec downstream and 640K bit/sec upstream. ISDN supports just two 64K bit/sec bearer channels and...