🚀 go-pugleaf

gt0449a@prism.gatech.EDU (Rob Coleman) writes:

]>Baud rate and Bits per second are essentially the same thing.

]No, they are not.  A "BAUD" is a signal change per second and a "bit"
]is a piece of information whose transfer is measured in BPS (bits per
]second).  A 2400 BPS modem (what many people think of as baud) IS
]actually running at 2400 BAUD (signal changes per second).  This means
]that at each "signal change" (from + to -, or vice versa), one bit is
]transferred.  A 9600 BPS modem (such as v.32 modems) are still actually
]running at 2400 BAUD, but are using the "signal changes" more
]"effectively" by transferring 4 bits on each signal change.  My
]understanding is that varying steps are used to denote the individual
]bits between each signal change from low to high (or high to low).
]This difference is what yields the speed increase from 2400 BPS to 9600
]BPS (and above).  My understanding also is that at 1200 BPS (and
]lower?), BAUD and BPS are actually the same thing (1 bit per signal
]change).  Inproving technology allowed one to increase the number of
]signal changes per second, and then the number of bits per signal
]change.  Until 9600 were around, the two terms were interchangeable,
]and this is what originally caused the confusion.

]I'm sorry if this is very confusing -- at the time that I was taught
]about this, I had to think long and hard about it too.  Please correct
]any discrepancies..
]-- 
]Rob Coleman ][ gt0449a@prism.gatech.edu        ][  "I think I'm going bald!"
]Comp. Sci.  ][ Georgia Institute of Technology ][        -Rush/COS

Correct, except that 1200 bps and 2400 bps modems use 600 baud, with 2 and
4 bits transferred per signal change, respectively.  I don't know what baud
rate faster modems use.  Popular use of "baud" to describe bit transfer
speeds began when they were identical, but now it is inaccurate.

--
Shawn Instenes, shawni@tis.llnl.gov, shawni@s1.gov
Distributed Computing Support Program, LLNL