Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!lll-winken!uunet!tektronix!reed!omen!caf
From: caf@omen.UUCP (Chuck Forsberg WA7KGX)
Newsgroups: comp.dcom.modems
Subject: Re: V.32 @ 38,400 bps MNP Class 9 Microcom Modem? Is this for real???
Keywords: microcom, modem, MNP Class 9
Message-ID: <751@omen.UUCP>
Date: 28 Apr 89 04:52:54 GMT
References: <28111@cci632.UUCP>
Reply-To: caf@omen.UUCP (Chuck Forsberg WA7KGX)
Organization: Omen Technology Inc, Portland Oregon
Lines: 36

In article <28111@cci632.UUCP> sz@cci632.UUCP (Stephen Zehl) writes:
:-
:	I'm holding an advertisement from Microcom for their new V.32 modem
:that they claim runs at 38,400 bps in MNP Class 9.  A little asking around
:and I found that they list at $1395.00 and we can get them for as little as
:$800.00!!!!!  
:
:	What's the story here?? Anyone have these, know about these, ever 
:used one??  Any and all information would be appreciated. 

Pro-YAM, ZCOMM and DSZ will get about 25,000 "baud" throughput on a 2400
bps line sending the Personal Computing Magazine ASCII Benchmark file
with compression.  MNP/9 should do nicely sending this file also.

I can guarantee neither will do as well sending compressed, batched news!

The raw throughput on a 2400 bps line is 300 characters per second
(synchronous).  Likewise 9600 has a raw throughput of 1200 cps.  Since
the higher levels on MNP use synchronous transmission, the 300 and 1200
cps speeds can be approached.  Any higher speeds are obtained by
compression in the modem or file transfer protocol.  BOth MNP/9 and
the latest TrailBlazer models feature compression, which is effective
on text files but not on compressed news, etc.

What affordable V.32 modems indicate is the presence of a non proprietary
full duplex standard >2400 bps on regular dialup lines.  This does
create a new ballgame.  That's why Telebit is tacking a Rockwell V.32
chip set onto their latest modem to become "more compatible" (read "more
competitive in the marketplace.").


Chuck Forsberg WA7KGX          ...!tektronix!reed!omen!caf 
Author of YMODEM, ZMODEM, Professional-YAM, ZCOMM, and DSZ
  Omen Technology Inc    "The High Reliability Software"
17505-V NW Sauvie IS RD   Portland OR 97231   503-621-3406
TeleGodzilla:621-3746 FAX:621-3735 CIS:70007,2304 Genie:CAF