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From: tagreen@lothario.ucs.indiana.edu (Todd Green)
Subject: Re: SUMMARY: PM9600SA modem and Practical Peripherals
Message-ID: <1991Jun4.194525.14503@bronze.ucs.indiana.edu>
Sender: news@bronze.ucs.indiana.edu (USENET News System)
Organization: Indiana University Computing Services
References: <1CE00001.hcngad@tbomb.ice.com>
Date: Tue, 4 Jun 91 19:45:25 GMT
Lines: 51


>> Is this a real 9600 baud carrier modem, or is it just a 2400 with thur-put
>> up to that of arround 960 cps??

I cannot believe that it is 9600 baud.  I would assume that it is 2400
baud carrying 4 bits per signal change. (Hence 9600 bps) Add MNP5 and
you get 19.2Kbps (with 2:1) compression.  Add v42bis and you get 38.4K
(with 4:1) compression.  How do you other people arrive at 9600 baud?
             
> >WITHOUT compression, we routinely see 700-750 characters per second
>(real file characters sent) and with compression, that number will
>approach 1200 cps with textual data!             

Well I have a Hayes UltraSmartmodem 9600 with v42bis.  I was also the        
bozo that claimed 22K throughput on compressed files.  Sorry that must
have been yet another late night.  Should have read on text files.  
usually can get 960cps to 1100 cps on compressed files
                                                                          
As for the _real_ world, I called Hayes 1-800 bbs in GA. (I live in
Indiana).  Here are the results of a 38.4K connection using Zmodem,
White Knight 11.07 and having Zmodem generate a final report. You can
generate the bits per second by taking the (Size*9bits)/(time*8bits)
(Since you have one stop bit, 8 data bits and no parity).

They highest cps rate that I achieved was ~3100 cps (during the
straight text file) and ~1200 cps for the archived file.



 Hayes Microcomputer Products, Inc., Norcross GA, USA

THE-WAVE.TXT  143579  11/27/90  The wave! File transfer test file
DAYRPT.ARC      8423  11/11/87  Compressed Lotus file
DAYRPT.WKS     19712  11/11/87  Standard, non-compressed Lotus file
SUNSET.ARC      5084  11/11/87  Compressed Graphics File
SUNSET.PIC     16391  11/11/87  Standard, non-compressed Graphics file
TEXT109K.ARC   29775  11/11/87  Compressed Text File 109K original
TEXT109K.TXT  111386   3/20/90  Standard, non-compressed Text File


File:'TEXT109K.TXT #1', Time: 0:40, Size: 111386, Efficiency: 71%
File:'SUNSET.PIC #1', Time: 0:06, Size: 16391, Efficiency: 71%
File:'TEXT109K.ARC #1', Time: 0:27, Size: 29775, Efficiency: 28%
File:'DAYRPT.ARC #1', Time: 0:07, Size: 8423, Efficiency: 30%
File:'TEXT109K.ARC #1', Time: 0:27, Size: 29775, Efficiency: 28%

Todd
-- 
Internet: tagreen@bronze.ucs.indiana.edu
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