| Author |
Message |
The Eighth Doctor
Guest
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 Posted:
Fri May 20, 2005 8:20 am Post subject:
Has anyone ever seen a crossover AUI cable? |
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Hello from the Eighth Doctor
For my problem to be solved, (See the earlier threads concerning a strange
networking problem.) I placed an e-mail to a company who made a gizmo which
translates between COAX, and UTP. They claim the gizmo is now discontinued, but
they have been saying that for about a year. <G>
Anyway while searching for solutions, and found them, I came across an e-mail
embedded in a webpage regarding a crossover AUI cable described inside Tomi
Enghdahl's terrific website.
Basically it's two connectors wired together, instead of straight through, he's got the
wires crossing over. Transmit on one to the receiver on the other, that sort of thing.
Has anyone seen a something of a sort?
----
Gregg drwho8 atsign att dot net |
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glen herrmannsfeldt
Guest
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| Posted:
Fri May 20, 2005 8:20 am Post subject:
Re: Has anyone ever seen a crossover AUI cable? |
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The Eighth Doctor wrote:
(snip)
| Quote: | Anyway while searching for solutions, and found them, I came across an e-mail
embedded in a webpage regarding a crossover AUI cable described inside Tomi
Enghdahl's terrific website.
|
AUI is not symmetrical, and passive crossovers can't work.
There are active devices, the most famous one is called DELNI,
which can be used to perform the function that you ask.
I also used to have two and four port transceivers that,
when properly terminated, would perform that function.
My first work with thick ethernet used two and four port
transceivers. One day I was having problems with a two port
that had been working. After working on it for a while, I figured
out that it failed when a transceiver cable was connected to the
unused port without a host. I then built my own AUI terminators,
and complained to the company that made them. There answer was to
send us some AUI terminators. The four port version didn't have
that problem, though.
-- glen |
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The Eighth Doctor
Guest
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| Posted:
Sat May 21, 2005 12:20 am Post subject:
Re: Has anyone ever seen a crossover AUI cable? |
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In article <d6ltfe$7fc$1@panix5.panix.com>, adykes@panix.com says...
| Quote: |
In article <7Euje.799283$w62.323706@bgtnsc05-news.ops.worldnet.att.net>,
The Eighth Doctor <drwho8__NOTME__@att.net> wrote:
In article <8I6dnSABlMbSHRDfRVn-oQ@comcast.com>,
gah@ugcs.caltech.edu
says...
The Eighth Doctor wrote:
(snip)
Anyway while searching for solutions, and found them, I came across an
e-mail
embedded in a webpage regarding a crossover AUI cable described inside
Tomi
Enghdahl's terrific website.
AUI is not symmetrical, and passive crossovers can't work.
There are active devices, the most famous one is called DELNI,
which can be used to perform the function that you ask.
I also used to have two and four port transceivers that,
when properly terminated, would perform that function.
My first work with thick ethernet used two and four port
transceivers. One day I was having problems with a two port
that had been working. After working on it for a while, I figured
out that it failed when a transceiver cable was connected to the
unused port without a host. I then built my own AUI terminators,
and complained to the company that made them. There answer was to
send us some AUI terminators. The four port version didn't have
that problem, though.
-- glen
Hello from the Eighth Doctor
I agree. That blurb was the first one to surface from a Google search. I just
finished
using one of their search engines for the DELNI. I would have better luck wiring
something of a sort.
Does anyone on the NG have just such an item roosting in their equipment room,
that they obviously do not need, and would be willing to part with, I'll pay
shipping
charges? And if your located in the tri-state area, (NY, NJ, CT), I'll take anything
medium sized that's not needed as well, physically. Please e-mail for physical
address.
--
Gregg drwho8 atsign att dot net
There are a couple on ebay.
--
a d y k e s @ p a n i x . c o m
Don't blame me. I voted for Gore.
Hello from the Eighth Doctor |
That was one of the first that surfaced. Since that website and I do not get along, I
decided to decline their offer.
--
Gregg drwho8 atsign att dot net |
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Al Dykes
Guest
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| Posted:
Sat May 21, 2005 12:20 am Post subject:
Re: Has anyone ever seen a crossover AUI cable? |
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In article <7Euje.799283$w62.323706@bgtnsc05-news.ops.worldnet.att.net>,
The Eighth Doctor <drwho8__NOTME__@att.net> wrote:
| Quote: | In article <8I6dnSABlMbSHRDfRVn-oQ@comcast.com>, gah@ugcs.caltech.edu
says...
The Eighth Doctor wrote:
(snip)
Anyway while searching for solutions, and found them, I came across an e-mail
embedded in a webpage regarding a crossover AUI cable described inside Tomi
Enghdahl's terrific website.
AUI is not symmetrical, and passive crossovers can't work.
There are active devices, the most famous one is called DELNI,
which can be used to perform the function that you ask.
I also used to have two and four port transceivers that,
when properly terminated, would perform that function.
My first work with thick ethernet used two and four port
transceivers. One day I was having problems with a two port
that had been working. After working on it for a while, I figured
out that it failed when a transceiver cable was connected to the
unused port without a host. I then built my own AUI terminators,
and complained to the company that made them. There answer was to
send us some AUI terminators. The four port version didn't have
that problem, though.
-- glen
Hello from the Eighth Doctor
I agree. That blurb was the first one to surface from a Google search. I just finished
using one of their search engines for the DELNI. I would have better luck wiring
something of a sort.
Does anyone on the NG have just such an item roosting in their equipment room,
that they obviously do not need, and would be willing to part with, I'll pay shipping
charges? And if your located in the tri-state area, (NY, NJ, CT), I'll take anything
medium sized that's not needed as well, physically. Please e-mail for physical
address.
--
Gregg drwho8 atsign att dot net
|
There are a couple on ebay.
--
a d y k e s @ p a n i x . c o m
Don't blame me. I voted for Gore. |
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The Eighth Doctor
Guest
|
| Posted:
Sat May 21, 2005 12:20 am Post subject:
Re: Has anyone ever seen a crossover AUI cable? |
|
|
In article <8I6dnSABlMbSHRDfRVn-oQ@comcast.com>, gah@ugcs.caltech.edu
says...
| Quote: |
The Eighth Doctor wrote:
(snip)
Anyway while searching for solutions, and found them, I came across an e-mail
embedded in a webpage regarding a crossover AUI cable described inside Tomi
Enghdahl's terrific website.
AUI is not symmetrical, and passive crossovers can't work.
There are active devices, the most famous one is called DELNI,
which can be used to perform the function that you ask.
I also used to have two and four port transceivers that,
when properly terminated, would perform that function.
My first work with thick ethernet used two and four port
transceivers. One day I was having problems with a two port
that had been working. After working on it for a while, I figured
out that it failed when a transceiver cable was connected to the
unused port without a host. I then built my own AUI terminators,
and complained to the company that made them. There answer was to
send us some AUI terminators. The four port version didn't have
that problem, though.
-- glen
Hello from the Eighth Doctor |
I agree. That blurb was the first one to surface from a Google search. I just finished
using one of their search engines for the DELNI. I would have better luck wiring
something of a sort.
Does anyone on the NG have just such an item roosting in their equipment room,
that they obviously do not need, and would be willing to part with, I'll pay shipping
charges? And if your located in the tri-state area, (NY, NJ, CT), I'll take anything
medium sized that's not needed as well, physically. Please e-mail for physical
address.
--
Gregg drwho8 atsign att dot net |
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Tomi Holger Engdahl
Guest
|
| Posted:
Mon May 23, 2005 8:20 am Post subject:
Re: Has anyone ever seen a crossover AUI cable? |
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glen herrmannsfeldt <gah@ugcs.caltech.edu> writes:
| Quote: | The Eighth Doctor wrote:
(snip)
Anyway while searching for solutions, and found them, I came across
an e-mail embedded in a webpage regarding a crossover AUI cable
described inside Tomi Enghdahl's terrific website.
AUI is not symmetrical, and passive crossovers can't work.
|
You are right that AUI is not symmetrical.
But according this Usenet news article that is archived at
http://www.epanorama.net/documents/lan/aui2aui.html
a suitable passive crossover could work on some cases:
Newsgroups: comp.dcom.lans.ethernet
From: mld@netcom.com (Matthew Deter)
Subject: Re: AUI to AUI cheaply, how?
Organization: NETCOM On-line Communication Services (408 241-9760 guest)
X-Newsreader: TIN [version 1.2 PL1]
Date: Sun, 13 Mar 1994 17:45:17 GMT
Jay Hennigan (jay@coyote.rain.org) wrote:
: I, too have a similar need, and turned to this newsgroup for the express
: purpose of asking about pin numbers! Tell us about your experience of 10
: years ago. I've got plenty of experience in making cables and the right
: tools, but just need the pin numbers if in fact it is doable.
The following is a reply I received when I asked this exact same
AUI <-> AUI "null modem" question a while back. (I forget which group
I asked on...)
I **DID NOT** try out this wiring diagram, as the need evaporated
before I had a chance to try it out. (I found some BNC transceivers
laying around. :-)
**Try this at your own risk.**
---BEGIN INCLUDE---
From ayeomans@vnet.IBM.COM Wed Oct 6 02:43:18 1993
Date: Wed, 6 Oct 93 10:42:20 BST
From: "Andrew J V Yeomans" <ayeomans@vnet.IBM.COM>
Subject: AUI <-> AUI cabling question
I've done the following, and got it to work. No promises, try at your
own risk!
Shield 1 1 Shield
Collision Detect A 2 2 Collision Detect A
Transmit Data A 3 ----\ /---- 3 Transmit Data A
(Receive Data Shield) 4 X 4 (Receive Data Shield)
Receive Data A 5 ----/ \---- 5 Receive Data A
Vc 6 --- --- 6 Vc
(Control Out A) 7 | | 7 (Control Out A)
(Control Out Shield) 8 | | 8 (Control Out Shield)
Collision Detect B 9 --- --- 9 Collision Detect B
Transmit Data B 10 ----\ /---- 10 Transmit Data B
(Transmit Data Shield) 11 X 11 (Transmit Data Shield)
Receive Data B 12 ----/ \---- 12 Receive Data B
V+ 13 13 V+
(V Shield) 14 14 (V Shield)
(Control Out B) 15 15 (Control Out B)
--
Andrew Yeomans 081-818 4288 NOSS/VNET: BASVM1(YEOMANA)
Internet: AYeomans@vnet.ibm.com IEA: GBIBML89 at IBMMAIL
IBM Ltd, 1 New Square, Bedfont Lakes, Feltham, Middx, TW14 8HB
---END INCLUDE---
--
$$ Matthew Deter
$$$$ mld@netcom.com
$$
$$$$ "The fortune of my spirit is not to be blown into coins of brass
$$ and flung to the winds as alms for the poor of the spirit."
$$$$
$$ -- from the novel _Anthem_ by Ayn Rand
| Quote: | There are active devices, the most famous one is called DELNI,
which can be used to perform the function that you ask.
I also used to have two and four port transceivers that,
when properly terminated, would perform that function.
My first work with thick ethernet used two and four port
transceivers. One day I was having problems with a two port
that had been working. After working on it for a while, I figured
out that it failed when a transceiver cable was connected to the
unused port without a host. I then built my own AUI terminators,
and complained to the company that made them. There answer was to
send us some AUI terminators. The four port version didn't have
that problem, though.
-- glen
|
--
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at
http://www.epanorama.net/ |
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glen herrmannsfeldt
Guest
|
| Posted:
Tue May 24, 2005 12:20 am Post subject:
Re: Has anyone ever seen a crossover AUI cable? |
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Tomi Holger Engdahl wrote:
| Quote: | glen herrmannsfeldt <gah@ugcs.caltech.edu> writes:
|
(snip)
| Quote: | AUI is not symmetrical, and passive crossovers can't work.
You are right that AUI is not symmetrical.
But according this Usenet news article that is archived at
http://www.epanorama.net/documents/lan/aui2aui.html
a suitable passive crossover could work on some cases:
|
Those some cases being ones where collisions never occur.
Even with two hosts, collisions are used to arbitrate
between those two.
If you can run them full duplex, unusual for AUI connections,
but it might be possible, then it should be fine.
-- glen |
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