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From: chambers@pine.uh.edu (Charles Chambers)
Newsgroups: comp.sys.next
Subject: Re: Connecting Thick Ethernet to the NeXT
Message-ID: <CHAMBERS.90Jul2154417@pine.uh.edu>
Date: 2 Jul 90 20:44:17 GMT
References: <1990Jun29.174727.15956@watdragon.waterloo.edu>
	<1990Jul1.194133.2889@quorum.com>
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In-reply-to: hempling@quorum.com's message of 1 Jul 90 19:41:33 GMT

In article <1990Jul1.194133.2889@quorum.com> hempling@quorum.com writes:

  > cjroehrig@poppy.uwaterloo.ca (Chris J. Roehrig) writes:


   >>We have a new NeXT that we want to connect to the campus Ethernet
   >>backbone.  We have a 25 meter Ethernet drop in our lab which would
   >>do fine except that it has a DB15 (thick Ethernet) connector on the
   >>end.
   >>    So we need an adapter to go from the DB15 connector to a
   >>BNC connector -- should be pretty straight-forward, right?

   >Right. Cabletron sells one for ~ $250. It's a very small box with the
   >DB15 connector on one end and a BNC on the other.  The official
   >name on the box is TMS-3 Ethernet/IEEE 802.3 Transceiver Unit (MAU).
   >   The main Cabletron office is in Rochester, NH. (P.O Box 6257, 
   >Rochester, NH 03867). The number is 603-332-9400.  They do have 
   >regional offices elsewhere that can ship the box to you within a
   >couple of days if they have them in stock. The San Jose office is 
   >at 2170 Paragon Drive, San Jose, CA  95131. The number there is 
   >at408-441-9900. A fellow there, David Vaiasicca, helped me out. 

  >Good Luck,
  >dave
  >hempling@quorum.com

 Wrong, That part is for going from Thin-Wire Ethernet to AUI (i.e. the DB15)
 Not from a transeiver cable to Thin-Wire. You do in fact need a single port
 repeater, or a ip-router. The singe port repeater can be found from a number
 of vendors, but it should be pointed out that repeaters should only be
 connected to the Ethernet backbone segment, and not daisy chained from one
 segment to another. A cheap IP-router can be put together using an PC with
 two ethernet controllers. I do not have the details about doing this, but
 it has been discussed here in the past. (maybe is the future NeXT will have
 an AUI connection option).

 Charles Chambers       (713)-749-2531
 University of Houston  chambers@uh.edu
 College of Engineering chambers@uhou.bitnet