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echo: hs_modems
to: JEROME HESS
from: GENNADY RASHKOVICH
date: 1997-03-18 02:47:00
subject: harmony multimedia 33.6

gemini!f18.n463!f10.n467!gemini.paco.odessa.ua!f10.n467!f21.n467!f31.n467!not-
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Jerome Hess wrote in a message to All:
 JH> I recentlt bought the above voice/fax/data modem and have a
 JH> question. on BBS access through PW4 in Win95 it lists the connect
 JH> speed (14400,31600,33600 etc). But on my internet connection w/
 JH> netcom using Windows Dialer I get either 28800 or 19200 (actually I
 JH> have received 24000 but who cares)
 JH> Here's the question. This modem is replacing an external Motorola
 JH> Lifestyle 28.8 which almost always got a 26400 connect. Yet at the
 JH> 19200 w/ the new modem there is a HUGE difference in Web access.
 JH> The new modem is MUCH faster in WEB and USENET. Any ideas?
 JH> Is this a bug in the display of the win95 dialer? Is it actually
 JH> hitting at 33.6 yet only showing 19.2?
 JH> HELP!!!!
   Well, at first, modems can fall back|go up with speed during connection. 
n
V.34bis they can even start with 4800 and grow up to 33600 (and vice versa ;(
   At second, there's _two_ speeds - Rx & Tx, and they may differ a lot; just
look this statistics, for example:
   Link Type         V.34Bis
   Line Speed        14400/28800
   Serial Speed      57600 8N1
   Error Ctrl/Comp   Lap-M/V.42Bis
   Symbol Rate       3200/3200
   Carrier Freq      1829/1920
   Trellis Encoder   4D 64-State/4D 16-State
   Precoding         Off/On
   Shaping           On/On
   Nonlinear Encoder On/On
   Preemphasis       4/8
   Tx/Rx Level       -12/-29 (-28 Avg) Db
   Snr               20 (39 Avg) Db
   Near/Far Echo     -26/-62 Db
It's clear, that in Internet online You'll receive much more info then send. 
So the difference between Rx & Tx speeds is substantional.
   And at last, 33600 with a lot of long retrains is much slower than 14400
without them. Maybe your old Motorola was much more optimistic about line
quality and got a lot of retrains...
        Best Regards,
           Gennady                              [TeamOS/2 GR011] 
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