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From: rjc@geech.gnu.ai.mit.edu (Ray Cromwell)
Newsgroups: comp.sys.amiga.misc
Subject: Re: A 9600 baud modem for $169!!!
Message-ID: <1991Jun11.005552.18494@mintaka.lcs.mit.edu>
Date: 11 Jun 91 00:55:52 GMT
References: <29138@know.pws.bull.com>
Sender: news@mintaka.lcs.mit.edu
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 First of all this article never states whether the SpeedCom
modem can achieve full-duplex 9600. This article is full of marktetroid
slashes at v32(vis)/v42(vis). And why MNP at only 4800 BPS? Sounds
like full-duplex 9600 is emulated by half-duplex channel flipping
(flip the 9600 baud channel back and forth, so you only get 4800 bps)
Even my HST can run MNP on 14,400 with no reduce in speed. MNP in
sync mode uses the start and stop bits on a byte to send extra
data so a HST or v.32 modem with MNP at 9600 will send 1200 CPS instead
of only 960 CPS like the Speedcom (it doesn't have MNP at 9600)

 SpeedCom is doing a dangerous thing by trying to introduce another
proprietary standard. I think it's too late. It may have worked
a few years ago, but v32(bis) is the standard and it happens to
work well. Mass production will eventually drive the cost down.


--
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