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To: Julian Elischer <julian@whistle.com>
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From: "Louis A. Mamakos" <louie@TransSys.COM>
Subject: Re: VC support, *BSD and atm/frame/isdn 
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In-reply-to: Your message of "Sun, 22 Sep 1996 22:46:28 PDT."
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Date: Mon, 23 Sep 1996 08:18:46 -0400
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> I don't think it's particularly efficient, but it's
> not expected to be running under very heavy usage in this version.
> I believe that they went out and did a scan of several providers to
> see if they could use them but somehow ended up doing it that way.
> I do know that they had a hard time trying to work out what pinouts to
> use for connecting a V35 connector to a connector small enough  for
> a back plate, and that they liked your DB25 implimentation.
> I've scanned the literature but I haven't found an "Official"
> or even "defacto" standard on how to do this.. the V35 connector is SOO
> clunky. I've been meaning to ask you... did you find that pinout
> somewhere, or did you make it up..?

Please, don't invent a new pin out for the connector!  Use a DB25 and
have it be EIA-530 compatible.  This is essentially a superset of the
V.35 "spec" in terms of the line drivers and receivers, and using a
simple adapter cable, you can get to a V.35.  I think that EIA-530 is
recommended for new applications, and certainly the cost is lower, too.

Though in most cases, your customers can just purchase EIA-530 compatible
CSU/DSUs, and use a straight-thru DB25 cable.  That way, there are no
large, clunky Winchester connectors around at all to cause injury.

Louis Mamakos