Hi All, have a quite straightforward question for you all which I've not been able to find an simple answer for.
In my Computing lesson, the teacher wasn't really sure, the text book wasn't sure itself (teacher also wrote the book) and I've been searching on the net without finding a clear answer. ie, one thats simple enough for me to understand :o(
Which one is the total rate (e.g. Data inc. overheads like stop/start, parity bit) and which one is the rate of information (e.g. useful data only, without parity,etc)?
Baud and bps are certainly NOT the same thing - and even the link that GANDALF <|:-)> gave is quite wrong about what baud rate is, though it probably answers your question about overheads in transmissions.
Baud rate is a signlalling speed originally used in telegraphs, and a measure of the rate of signal level changes. At higher modem speeds, several bits can be transmitted per signal level change.
Baud is best forgotten for modem telecomms, and bits/sec - bps - used, which is more meaningful in data transmission work.
Do a Google for more wrong definitons than you can shake a stick at - and some correct ones!
"Which one is the total rate (e.g. Data inc. overheads like stop/start, parity bit) and which one is the rate of information (e.g. useful data only, without parity,etc)?"
So finally to try and answer your original question
bps is the measure that should be used. Unfortuately, I think that when expressed as a line-speed, or modem speed (as in a "56K modem") it probably means all bits, including data and overheads - and when expressed as a measured data transmission speed, it may be data characters (as that's what these "speed-tests" actually count.)