bandwidth required for a voice call, engineers limited the frequencies from 0 to 4000Hz allowing more simultaneous calls (The range of the normal human voice is 300 to 3500Hz.) Unfortunately, this bandwidth range has a detrimental effect on data communications. Multiple PPP Also known as "shotgun". This means you connect two modems, to two phone lines, and dial-in to your ISP for double the bandwidth of 56k. Most recently some phone dial up isp, , DC up isp dial up isp, dial Washington DC, dial up isp
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