Hello (again) from Gregg C Levine
Thanks go to Johnny Billquist, and of course Matt Thomas, for
correctly identifying that device. I deliberately left off the wire
identifier for the attachment end, since I did know that it was a
10BASE-2 device that attached to the thicknet end.=20

I simply needed confirmation of what the name on it did mean. In fact
the both of you gave much of the same material, and actually provided
new meaning to the concepts behind the organization of this list.
Dave, your next. You provided an interesting position statement on the
thing, but I needed more about it.

And yes, Matt, I did find a cable wearing a T style connector, and a
terminator. As I was typing that out, and this thank you note, I
recalled somewhere that the terminated end of a coax cable typically
indicated the end or beginning of an Ethernet network. Now the biggest
problem will be putting it to work.
-------------------
Gregg C Levine hansolofalcon@worldnet.att.net
------------------------------------------------------------
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"Use the Force, Luke."=A0 Obi-Wan Kenobi
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> -----Original Message-----
> From: Johnny Billquist [mailto:bqt@update.uu.se]
> Sent: Saturday, January 17, 2004 5:59 PM
> To: Gregg C Levine
> Cc: port-vax@NetBSD.org
> Subject: Re: Found DEC branded AU, need specs
>=20
> On Sat, 17 Jan 2004, Gregg C Levine wrote:
>=20
> > Hello from Gregg C Levine
> > Here's how it happened. I visit a store in the Canal Street
district
> > of Manhattan perhaps four times a month. This time I stopped in
there,
> > and went over their collection of electronics salvage. I'd already
> > obtained a batch of AUIs made by Synoptics, and two designed by
AMP,
> > from the same place so this one was to be expected.
> >
> >  It has the Digital trademarked name on it, and the word DESTA on
it,
> > in capital letters. And then the usual model number, and serial
> > numbers, I'll spare them from the list. Does this particular gizmo
> > ring any bells for anyone on the list? I might add, that it is an
AUI
> > configured to be attached to a 10BASE network using coax from the
> > traditional AUI attachment (DB15) connector.
>=20
> 10Base what? 10Base in itself is just another way of saying it's a
normal
> 10 Mbit/s ethernet.
>=20
> You have 10Base-5, which is the old thickwire, 10Base-2, which is
the
> thinwire, and 10Base-T, which is the twisted pair. There are a
couple
> more, which I don't remember right now.
>=20
> What you have in your hand is a transciever. Old ethernet cards
usually
> have the AUI connector (the 15-pin thing), and then you used an
external
> transciever to hook up to the physical ethernet. At the start, there
was
> only 10Base-5, so you had transcievers which connected to the thick
> coax. Normally with a vampire tap. The maximum segment length is 500
> meters, which is where the -5 comes from. Since many didn'=E4t like
handling
> that thick coax, drilling in it, and spacing transcievers at atleast
2.5
> meters distance from each other, 10Base-2 came, in which the maximum
> segment length is 200 meters, and unless my memory fails me, the
minimum
> distance between two transcievers is 0.5 meters.
>=20
> Okay. So far it's all really easy. So what about more modern cards,
on
> which you don't have AUI, but instead have the small coax connected
> directly, or the TP cable. Well, those have a transciever as well,
but
> it's integrated on the card. Means you need less hardware, but you
cannot
> use it for any other physical medium than what the built-in
transciever is
> for.
>=20
> By now, it should be obvious that what you have is a 10Base-2
transciever.
>=20
> 	Johnny
>=20
> Johnny Billquist                  || "I'm on a bus
>                                   ||  on a psychedelic trip
> email: bqt@update.uu.se           ||  Reading murder books
> pdp is alive!                     ||  tryin' to stay hip" - B. Idol