🚀 go-pugleaf

fenner@engcon.marshall.ltv.com (JWFENNER) writes:

:Baud rate and Bits per second are essentially the same thing.
:For example, if you have a 2400 baud modem, you can transfer
:2400 bits per second.  Bytes per second is another story, however.
:Data sent over the modems is broken down as follows:


The above is really true.  The baud rate describes the line characteristics.
It represents the number of oscillations per second of the signal.  Bits per
second is exactly that,  the number of bits per second which are transmitted.
It is true that most low baud modems,  the bps is the same as the baud rate.
However there are many techinques which can be used to send multiple bits per
each oscillation of the line.  Therefore,  the bps is not equal to the baud
rate.

It is always best to use the two terms independently.  The baud rate simply
describes the the line characteristics while the bits per second describe the
transfer rate of the data.  What is being described by the two terms is not the
same thing and should not be confused with each other.

:+-----------+-----------+-------------+
:| START BIT | DATA BITS | STOP BIT(S) |
:+-----------+-----------+-------------+

:where START BIT is 1 bit, DATA BITS is generally 8 bits (without parity),
:and STOP BITS is usually 1 bit.  These numbers can vary, but this is the
:most common format used today.

:What this means is that for each BYTE of data you send, you actually send
:10 bits, not just 8.  So your effective BYTES PER SECOND would be 240 for
:a 2400 baud modem.

This is basically correct.

:Most of the newer modems also use compression techniques to help improve
:the EFFECTIVE baud rate.

Again, the baud rate only defines the characteristics of the line,  not the
transfer rate of data on the line.  There is no such thing as an effective baud
rate,  only an effective data rate.

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