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Before switching to 56K modem we should take into account that:
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only the best phone lines (with the lowest noise level) can handle 56-Kbps transmission. According to analysts, only 50% of US connections are clean enough
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Some ISPs need to upgrade their connections to carrier phone networks
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If lines are not pure digital and additional conversions take place, 56 K cannot be obtained.
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There is also legal limit on speed: an FCC regulation dating back 20 years does not allow for higher modem transmission than 53.3 Kbps
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If we buy now the vendor should offer upgrade to eventual standard.
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The modem should be compatible with equipment in central site
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And of course the full 56Kbps is available for download only. Upload of data is available at standard rates (max 33.6 Kbps).
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There are also other issues which should be taken into account (vendor, technology, type, upgradability to new standard, remote configuration and management)
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PC must be fast enough to keep up with the modem : it is important when data are compressed more than 2:1. The serial interface in PC (which usually is 115.2 Kbps can be too slow and must be accelerated.)
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