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From: ncpjmw@pepsi.amd.com (Mike Wincn)
Newsgroups: comp.dcom.lans
Subject: Re: 10BaseT on 26 AWG UTP?
Message-ID: <29583@amdcad.AMD.COM>
Date: 21 Mar 90 20:41:51 GMT
References: <8564@lindy.Stanford.EDU>
Sender: news@amdcad.AMD.COM
Reply-To: ncpjmw@pepsi.AMD.COM (Mike Wincn)
Distribution: usa
Organization: Advanced Micro Devices, Inc. Sunnyvale CA
Lines: 30

In article <8564@lindy.Stanford.EDU> romeo@lindy.UUCP (Patrick Goebel) writes:
>the 22 and 26 AWG media to fall outside the 10BaseT specs.  Does
>anyone know if the current form of the 10BaseT "standard" specifies
>only a 24 AWG medium?
>
>Many thanks,
>patrick goebel--romeo@lindy.stanford.edu

Draft 10, as well as earlier drafts, focuses on 24 gauge UTP, but makes
allowances for 22 to 26 gauge wire.  The reasons for primary focus on 24 GA
included that there was a great deal more information available on the use
of that wire size in that noisy environment, that the 10Base-T task force 
didn't have the resources to do full investigations of all other gauges,
and that a need for writing such a weighty tome was never established. 

An end user is not restricted to 24 GA UTP.  Draft 10 stipulates that an
end user is free to use any wire gauge, or combination of wire gauges, that
he chooses as long as it can be shown that a given link segment does not
exceed limits on attenuation, delay, line impedance, or crosstalk, and only
then if he intends to transmit over a distance of at least 100m. 

It is presumed that an end user who chooses to work with a system that exceeds 
Draft limits will then accept responsibility for non-compliance.  

Mike Wincn
(408) 749-3156
ncpjmw@pepsi.AMD.COM

Opinions expressed are my own, not necessarily those of AMD or the 10Base-T
Task Force.