Hi Bill,
 
 AM> What's the highest speed you have EVER got on any of your 
 AM> 28.8 or 33.6 modems?

 BG> 4008cps whilst transferring a 1.6Mb maximally compressed file between
 BG> two V.E Couriers with a 33k6 connect, and using 256-byte LAPM with SREJ
 BG> active.   
 AM> A couple of nights ago, I got 4290 cps, upload on a 28.8K connection.

 BG> Something is wrong, as that overall speed is just not physically
 BG> possible. 
 AM> The file was compressed with PKZIP, using maximum compression (-EX) and
 BG> the 
 AM> file was about 1.6MB big. Zmodem protocol, V.42 and V.42bis, etc.

Believe it or not, I completely agree with you as far as the 4290 cps thing
goes. It has happened again since then, starting at 4300 cps and going slowly
down to 3550 cps, this was uploading. My modem uploads quite a bit faster
than it downloads, these rates were from the same BBS. I still don't believe it,
and both files were certainly ZIP files compressed with maximum compression.
Telix reported 4280 cps average the first time, and the BBS at the other end
reported an average of 4250 cps.

 BG> The file is certainly large enough to allow for accurate logging of
 BG> transfer rates, so all I can suggest is that the file may somehow have
 BG> still been subject to further compression with BTLZ.  Can't see how
 BG> though. 
 AM> I thought maybe my comms program was buggering up, but when the upload 
 AM> finished from their end it reported 4290 cps average. What do you think? 

 BG> Maybe both ends buggered up somehow?  Or perhaps the file had already
 BG> been partially sent, and Zmodem has simply appended the balance of the
 BG> file to the original with its crash-recovery feature.  That'd certainly
 BG> indicate inflated cps rates, depending upon how much of the file had
 BG> already been sent.

Yes, that could happen, I appended a file one day, and it reported 20000 cps
(what a crock of crap), but this file definitely wasn't appended because
Telix reports it if the file is being resumed.

 AM> This modem is a Netcomm Roadster V34, and the highest CPS rate I ever got 
 AM> before was 3390 cps in the same situation as above.

 BG> Which is precisely what you should be expecting...

Don't get 3390 cps very often though, it's usually something more like 3250-3350
cps, depending on what type of archive it is.

Regards,
Alex
... Backup not found: (A)bort (R)etry (S)lap nearest innocent bystander.
___ Blue Wave/DOS v2.30 [NR]

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