Date: Thu, 20 Mar 1997 13:40:04 -0800 (PST) From: Doug White <dwhite@gdi.uoregon.edu> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: questions@freebsd.org Subject: Re: a networking question... Message-ID: <Pine.BSI.3.94.970320133451.4815I-100000@localhost> In-Reply-To: <199703201213.NAA05613@labinfo.iet.unipi.it>
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On Thu, 20 Mar 1997, Luigi Rizzo wrote: > sorry if I abuse of this group for a partially unrelated question... > > I am having a hard time in finding cheap Ethernet repeaters with > BNC ports, whereas 10 Mb/s HUBs with 10BaseT RJ45 ports are now > available for about $15/port. Is it possible to connect the AUI > port of a BNC transceiver to the Tx/Rx pairs of an RJ45 port and > make the connection work ? (of course with an external power supply) No. The transmission medium is entriely different. Coaxial cable requires different power levels and encoding. There's only one wire in there, and you need 4 for utp. The problem here is that BNC is designed as a "bus" topology, not a "star" medium like UTP. BNC hubs sort of 'short-circuit' this layout. I suspect it requires intricate circuitry to manage the ports, plus this sort of topolgy is very, very rare. Heck, Coax is pretty rare nowadays because it's such a pain to manage and is easy for one workstation to break the whole network (literally). Doug White | University of Oregon Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant http://gladstone.uoregon.edu/~dwhite | Computer Science Major
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