D connector tirade (was: Re: Age-old ethernet equipment)

From: Richard Erlacher <edick_at_idcomm.com>
Date: Fri Mar 30 20:49:48 2001

Now there's a case I had never worried about. I guess it could come up, since
the signals really needed for VGA are just the six video/return signals and the
two sync's and a common for them. That's 9, and certainly would warrant a valid
connector configuration that one could call DE9, though that one already exists.
I'm glad I don't have to explain that. There is, by the way, another more
"current" name for the 3-row, 'E'-shell connector commonly seen with 15 pins in
it in VGA applications. I'm not remembering it, though.


----- Original Message -----
From: "Tony Duell" <ard_at_p850ug1.demon.co.uk>
To: <classiccmp_at_classiccmp.org>
Sent: Friday, March 30, 2001 11:22 AM
Subject: Re: D connector tirade (was: Re: Age-old ethernet equipment)

> >
> > The origitnal concept underlying this designiation scheme was based on the
> > notion that you had the 'D' for the shape, the <A..D> for the shell sizes
> > were in use at the time, 'E' and beyond coming later. and a number for the
> Yes, that's the explanation I heard for why the 9 pin is size E (rather
> than A, with all the others moving up one letter).
> > number of POPULATED pin locations.
> The problem with that notation is : what do you call a connector formed
> by taking a VGA connector shell (for want of a better name) and puting 9
> pins in it. It can't be a DE9 because that's the normal E-shell with all
> positions populated.
> Also, IIRC, there were DE3 and DE5 connectors used by HP for serial lines
> at one point. And the pin spacing was not the same as either the normal
> DE9 or high-density DE15.
> No, I think the number _has_ to be the total number of contact positions
> that could be used.
> -tony
Received on Fri Mar 30 2001 - 20:49:48 BST

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