-=> Quoting Bill Cooper to Dave Lyle <=-
-=> FidoMail to 1:163/215, please.-=<
bc> Sorry to burst your bubble here, but I personally did have a
bc> fully compressed zip file transferred to me at a little over
bc> 4400 cps... that was compressed using the -EX command... so...
bc> anyone could see that the superiority of the USR Courier
bc> (especially when both ends are using them) shine through the
bc> theoretical and push the limits of technology. Just as a
bc> sideline... I spoke with the Sysop of this particular BBS and
bc> both his log file and my log file confirmed the transfer rate. 
_Not possible_, Bill.  If you're connected at 33,600 bps, and using
error correction alone, the throughput has a theoretical max of
33,600/8= 4200 bps between the modems, and slightly lower past the
modem because of the overhead.
If the file is already compressed, then V.42bis will not compress it
further, so the throughput simply _cannot_ exceed 4200 bps. 
Unless....
The file is a zipped archive comprised of multiple files, in which
case the *file names* are _not_ compressed in the archive, and
therefore _may be_ compressed by 4.42bis - and you may show a rate of
4400 bps or higher.
You will note, however, in this latter case the file wasn't "fully
compressed".
:-)
TTFN. Rick.
Ottawa, ON 17 Mar 14:51 
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