Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!bu-cs!kwe
From: kwe@bu-cs.BU.EDU (kwe@bu-it.bu.edu (Kent W. England))
Newsgroups: comp.dcom.lans
Subject: Re: null Ethernet
Message-ID: <27748@bu-cs.BU.EDU>
Date: 8 Feb 89 17:38:15 GMT
References: <1064@wasatch.UUCP>
Reply-To: kwe@buit13.bu.edu (Kent England)
Followup-To: comp.dcom.lans
Organization: Boston U. Information Technology
Lines: 31

In article <1064@wasatch.UUCP> haas@wasatch.UUCP (Walt Haas) writes:
>I seem to recall reading that somebody made a "null ethernet" box,
>that is a box that had two DB15s so that you could create a trivial
>Ethernet without buying transceivers or a DELNI.  I can't find the
>reference - does anybody out there know of such a thing?
>
>Thanks --  Walt Haas    haas@cs.utah.edu    utah-cs!haas


	American Network Connections makes a two port delni or
"ethernet null modem".  They are in Sunnyvale at (408) 737-1511.

	Someone reported flaky behaviour using this product as a null
modem.  I wish I could remember who it was.  Take this warning with a
grain of salt, I do not wish to denegrate ANC without justification.

	I decided there just wasn't enough price differential between
a two port and an eight port delni to justify stocking and supporting
two products from two vendors.  We use Cabletron transceivers and
delni's.   There are multi-ports where you can buy the interfaces one
or two at a time.  Would that save a substantial amount of money?  I
don't think it's worth the trouble.

	On another note, there is now a fiber optic transceiver cable
extender product on the market (at least I know of *one*).  This is a
nifty item when you want to install one node a long way away from a
delni or transceiver port without getting into a f/o multiport
concentrator or kluding in a f/o repeater (wrong sex connector on one
end).  Not sure what the delay budget is.

	Kent England, Boston University