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From: roy@phri.UUCP (Roy Smith)
Newsgroups: net.lan
Subject: Can ethernet use branched cable?
Message-ID: <2239@phri.UUCP>
Date: Wed, 19-Feb-86 20:09:31 EST
Article-I.D.: phri.2239
Posted: Wed Feb 19 20:09:31 1986
Date-Received: Fri, 21-Feb-86 05:37:38 EST
Reply-To: roy@phri.UUCP (Roy Smith)
Organization: Public Health Research Inst. (NY, NY)
Lines: 23


        Is there any reason why an ethernet (thin or thick) cable can't be
branched?  All the diagrams I see only show linear layouts with taps off
the main line.  Will the following work?  We plan on some extra runs that
don't have anything on them (yet); thus the branch with just a terminator.
Assuming these branches are legal at all, should the ends have just dust
caps instead of terminators?

        *=======T========T===========T============X======X====*
                |        |           |            #      #
          3/50--+        *           +---3/50    etc     #
                |             3/50---+                   #
                +---3/50             +---3/50          3/180
                |                    |
                *                    *

   Key:  *  50-Ohm terminator            +  BNC-tee connector
         =  Thick cable                  |  Thin cable
         X  Ethernet tranceiver          T  N-tee connector with BNC adapter
-- 
Roy Smith, {allegra,philabs}!phri!roy
System Administrator, Public Health Research Institute
455 First Avenue, New York, NY 10016