LF: A 9600 bps Note!
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LF: A 9600 bps Note!
A serial port can run at 115200+ bps if you've got a reasonable UART. Your
modem can send information through your serial port at that rate; it
cannot, however communicate over a phone line at that speed. I believe
that 2400 baud is the actual figure you meant. 2400 baud refers to signals
per second. The implication is that to communicate above 2400 baud, you
need to have a range of signals (frequencies) to compensate. For example,
you would need 12 different signals in the case of a 28800 bps modem. The
problem is that line noise and degradation make it hard to correctly
differentiate between signals, and this is why modems seem to be slow in
gaining speed lately. Data compression just allows the effective data
transfer rate to be higher than the modem speed in some cases, and this is
why it is advantageous to have your serial port run at a high rate like the
aforementioned 115200 in order to accept the decompressed data from the
modem.
This is a gross simplification, but...
-Kevin
khuber@mr.net
Ciebiera@aol.com writes:
> I don't think that anyone's aware that all modems communicate at 9600 baud,
> that is the fastest a serial port can go the only difference between a 14,400
> and a 28,800 is the algorythem for the data compression. If there was a way
> to emulate that in a new graph link then you could hook up with the internet
> at 28.8K. Just thought I'd let everyone know.
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