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From: roy@phri.nyu.edu (Roy Smith)
Newsgroups: comp.misc
Subject: Re: RS-232 Question - Speed vs Length
Keywords: RS-232
Message-ID: <1990Feb22.192837.20333@phri.nyu.edu>
Date: 22 Feb 90 19:28:37 GMT
References: <608@gtenmc.UUCP>
Sender: news@phri.nyu.edu (News System)
Organization: Public Health Research Institute, New York City
Lines: 20


> a function to provide error rates (eg. 2% error) for the given table?

>          10    20    30    40    50    60    70    80    90   100
> [...]
> 9600

	Assuming your lengths are in feet, you had better extend the table
a lot to the right.  We have runs of up to about 250 feet of Belden 8723
(shielded 24 (22?) gauge twisted pair) which we run at 9600 with, as far as
I can tell, 0% error rate with no special line drivers.  I suspect that if
you are willing to put up with a 2% error rate (which sounds pretty drastic
to me) you could probably get many hundreds of feet at 9600, if you use the
right kind of wire.  With line drivers, you should be able to get thousands
of feet, but that's not RS-232 any more.
--
Roy Smith, Public Health Research Institute
455 First Avenue, New York, NY 10016
roy@alanine.phri.nyu.edu -OR- {att,philabs,cmcl2,rutgers,hombre}!phri!roy
"My karma ran over my dogma"