When modems were young (a long time ago), they were used in teleprinter circuits
at the sedate speed of 45.45 signals (also called elements or pulses) per second. One
element per second
is one baud
(based on the
old 5-unit digital
Baudot code)
and may consist
of several bits of data. The Baudot code was
replaced by the ASCII code many years
ago.The low speeds of these early modems sufficed
for many years – until these devices came
to be required for linking other machines such
as computers or computers and telephone
exchanges. Owing to these different demands,
over the past ten years or so, the speed of
modems has been raised and raised again, but
now, owing to the limitations of the analogue
sections of the telephone network, the limit of
33.6/56 kbit/s seems to have been reached. But
is this really so?
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