Meanwhile, back at the farm, Hayes Support said to Preston Renard:
PR> JT> SB> With a 144 modem 13-1500 cps is about right.  To get
PR> JT> SB> faster
PR> JT> AT> Actually you should be looking more towards 1600cps..
PR> JT>You guys are gettin' my goat.:-(
PR> JT>I always average about 1365cps running 14.4 from a 33.6
PR> JT>and no matter what settings I play with, thats what I get.
PR> 
PR> IMO this thread seems to point out how little most of us understand
PR> about the virtually plug and play device called a modem.
PR> 
PR> As I understand it there are 8 bits to each character.  If one's thruput
PR> is running at about 1000 characters per second (cps), this equates to
PR> 8000 bits per second (bps).  1500 cps equates to 12,000 bps. Now,
PR> achieving only 12K bps or less from a device rated at 14.4K bps seems
PR> problematic to me.  I understand there are various factors that can
PR> impact thruput.  But when I posed my original message, I was hoping
PR> somone could help me understand either why my typical thruput of
PR> 1300-1500 cps from a 14.4 Kbps is correct OR whether any measures could
PR> be taken to make improvements.
PR> 
PR> Any takers?
PR> 
HS>     There are 8 bits/character, but with a standard async
HS> modem connection     you'll be adding stop and start bits as
HS> well to bring it up to 10 bits     per character.  This
HS> really isn't a consideration though, since your     error
HS> correction protocol will most likely be stripping the stop
HS> and     start bits off before the data is sent.  Your
HS> throughput of 1300-1500     cps is just a little slower than
HS> normal, but there are many factors that     can affect
HS> throughput: phone line noise, system speed on either end    
HS> (a heavily tasked cpu can slow things down), the type of
HS> UART in     the serial cards, the file transfer protocol
HS> being used, the type of     data being transferred
HS> (compressible or not), etc. etc.  If you     are
HS> transferring fully compressed files under good conditions
HS> with a     full streaming file transfer protocol like Zmodem
HS> and with a port     speed set to at least 19,200 bit/s, 1600
HS> cps is about average. 
Don't forget, if he has an internal, he must disconnect whichever com port he 
is using to stop a com port conflict. This can greatly affect the throughput.
Tom Gallagher
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