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echo: aust_modem
to: Leon Bloor
from: Bill Grimsley
date: 1996-05-08 16:27:44
subject: USR Sportster, I`m impres

Leon, at 20:53 on May 05 1996, you wrote to BILL GRIMSLEY...

TM> With the other 28.8k modems I've used, I averaged around 2800 cps 
TM> with compressed files. With the USR, I'm getting over 3200 cps. 

LB> i've read some text file that said that a v.32bis will get 3000cps with 
LB> ascii text and 1500cps with zipped files, is this incorrect or just 
LB> different connect conditions? 

Too many variables to be specific, but at V.32bis you should expect
compressed files to transfer at between 1650-1680 cps on average with
Zmodem, and maybe 30-40 cps faster with MNP4 and Ymodem-g.  Uncompressed
files are theoretically capable of being sent at up to 4X the link rate
with BTLZ data compression (or LAPM), but normally the best you'll see is
around 2.5X (say 3500-3700 cps).  Regardless, it's always better to
compress these files first.

Regards, Bill

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