Modems

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up to
56Kbps. Unlike the 33.6Kbps modems being sold today, 56Kbps is a significant
improvement over 28.8Kbps modems. Viewing complex graphics or downloading sound
files improves significantly with 56Kbps. The modem experts keep telling us that
we are about maxed out. For instance when the 28.8 modems where first introduced
they said that we've reached our maximum speed, and the same thing was said
about the 33.6 and now again for the 56K, but how true is this? The experts say
that the next major improvement will have to come from the telephone companies,
when they start laying down fibber-optic cables so we can have integrated
services digital network (ISDN) . The thing that makes digital modems better
than analog is because with analog modem transmission errors are very frequent
which results in your modem freezing or just freaking out. These errors are
caused mainly by some kind of noise on the line due to lightning storms,
sunspots, and other fascinating electromagnetic ...

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sending
data over a phone line. In synchronous data transmission, data is sent via a
bit-stream, which sends a group of characters in a single stream. In order to do
this, modems gather groups of characters into a buffer, where they are prepared
to be sent as such a stream. In order for the stream to be sent, synchronous
modems must be in perfect synchronization with each other. They accomplish this
by sending special characters, called synchronization, or syn, characters. When
the clocks of each modem are in synchronization, the data stream is sent.
In asynchronous transmission, data is coded into a series of pulses,
including a start bit and a stop bit. A start bit is sent by the ...

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