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From: gardner@uxc.cso.uiuc.edu.UUCP
Newsgroups: comp.dcom.lans
Subject: Re: Ethernet : Broadband vs Baseband
Message-ID: <172100001@uxc.cso.uiuc.edu>
Date: Tue, 17-Feb-87 17:12:00 EST
Article-I.D.: uxc.172100001
Posted: Tue Feb 17 17:12:00 1987
Date-Received: Thu, 19-Feb-87 20:40:38 EST
References: <2334@sunybcs.UUCP>
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Nf-From: uxc.cso.uiuc.edu!gardner    Feb 17 16:12:00 1987


The length limitation of baseband ethernet is a function of the minimum
packet size, the speed of propagation in the specific cable and the
collision detect algorithm.  The maximum lenth of cable together makes sure
that if two packets are tranmitted from either end of the cable, that
each(and everyone in between) will see each others packet and hence the
collision, while they are still transmitting.  Broadband ethenets get
around the problem by using different collision schemes.  Most broadband
ethernets actually offer less bandwidth than baseband, and few packets/second
due to their collision detect.
mgg