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From: jeff@drexel.Drexel.edu (Jeff White)
Newsgroups: comp.dcom.lans
Subject: A question about ethernet boards with thinwire and transceiver outputs
Message-ID: <479@drexel.Drexel.edu>
Date: Sun, 12-Jul-87 18:52:46 EDT
Article-I.D.: drexel.479
Posted: Sun Jul 12 18:52:46 1987
Date-Received: Wed, 15-Jul-87 03:56:18 EDT
Organization: Drexel University, Phila., Pa.
Lines: 24
Keywords: ethernet thinwire tranceiver


  I have a question about computers or ethernet boards that have both
thinwire (BNC connector) and transceiver (DB-15 conn.) outputs (independent
of manufacturer).  With one of these boards, are both outputs active at
the same time?   For example, suppose you are using the transceiver output,
with a transceiver attached to a thick wire ethernet cable (typical of
most installations).  What happens if you now attach 1 or more stations
to the same interface board using the thinwire output.  Will this 'master'
station be able to talk to all the stations on both the thinwire and
thickwire cables?  Will all the stations appear to be located on 1 common
backbone cable, or will the stations on the thinwire and thickwire be isolated
from one another?  If they are isolated, can the 'master' (common) station
act as a gateway?  Originally, I just assumed that for some reason both
outputs wouldn't be usable at the same time.  However, after thinking about
it for a while, it seems to me that if there isn't any type of switch which
specifically selects one output, that both should be functional at the same
time.  
   If replies are via email and I get a definitive answer, I'll summarize
the findings to the net.


						Jeff White
						Drexel University - ECE Dept.
						seismo!presby!drexel!jeff