| Author |
Message |
bmearns
Guest
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 Posted:
Thu Nov 24, 2005 9:20 am Post subject:
Simplest hardware node |
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I'm looking for the simplest possible hardare implementation that I can
connect via cat5 ethernet cable to my router that my router will
recognize as a node on the network, and be willing to send it data,
even if that data is simply dropped on the floor, so to speak.
Is it possible to just use a power supply and ground to set certain
pins on the cable a constant high or low?
Any help is greatly appreciated. Thanks. |
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glen herrmannsfeldt
Guest
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| Posted:
Thu Nov 24, 2005 9:20 am Post subject:
Re: Simplest hardware node |
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bmearns wrote:
| Quote: | I'm looking for the simplest possible hardare implementation that I can
connect via cat5 ethernet cable to my router that my router will
recognize as a node on the network, and be willing to send it data,
even if that data is simply dropped on the floor, so to speak.
Is it possible to just use a power supply and ground to set certain
pins on the cable a constant high or low?
|
Oh, that's what you mean.
A 10baseT transceiver and a power supply should do it.
-- glen |
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James Knott
Guest
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| Posted:
Thu Nov 24, 2005 5:20 pm Post subject:
Re: Simplest hardware node |
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glen herrmannsfeldt wrote:
| Quote: | bmearns wrote:
I'm looking for the simplest possible hardare implementation that I can
connect via cat5 ethernet cable to my router that my router will
recognize as a node on the network, and be willing to send it data,
even if that data is simply dropped on the floor, so to speak.
Is it possible to just use a power supply and ground to set certain
pins on the cable a constant high or low?
Oh, that's what you mean.
A 10baseT transceiver and a power supply should do it.
-- glen
|
Or a cheap hub or switch. They might be more readily available.
BTW, please don't request an e-mail reply for a question posted in the
newsgroup. If you can't be bothered to check back here, we can't be
bothered to reply. |
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bmearns
Guest
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| Posted:
Thu Nov 24, 2005 5:20 pm Post subject:
Re: Simplest hardware node |
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Thanks for both response;
I'm actually looking to expand this project slightly, do you know of
anything even simpler (in terms of hardware, not effort) that I could
do, say with a bread board?
| Quote: | "If you can't be bothered to check back here, we can't be
bothered to reply." |
That's a good point, James thank you, I won't do that anymore. |
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Gerard Bok
Guest
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| Posted:
Fri Nov 25, 2005 12:59 am Post subject:
Re: Simplest hardware node |
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On Thu, 24 Nov 2005 06:55:29 -0500, James Knott
<james.knott@rogers.com> wrote:
| Quote: | glen herrmannsfeldt wrote:
bmearns wrote:
I'm looking for the simplest possible hardare implementation that I can
connect via cat5 ethernet cable to my router that my router will
recognize as a node on the network, and be willing to send it data,
even if that data is simply dropped on the floor, so to speak.
Is it possible to just use a power supply and ground to set certain
pins on the cable a constant high or low?
Oh, that's what you mean.
A 10baseT transceiver and a power supply should do it.
-- glen
Or a cheap hub or switch. They might be more readily available.
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Are you sure a router would actually dump data to a hub or switch
without any other connection ?
I would expect some ARP requests --at most--, but no payload :-)
--
Kind regards,
Gerard Bok |
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James Knott
Guest
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| Posted:
Fri Nov 25, 2005 6:50 am Post subject:
Re: Simplest hardware node |
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Gerard Bok wrote:
| Quote: | Or a cheap hub or switch. They might be more readily available.
Are you sure a router would actually dump data to a hub or switch
without any other connection ?
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Something like UDP or ICMP would work fine, as they don't require a
"connection" to the other computer, the way TCP does. All they need, is a
working network connection and they don't care what's beyond. |
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spammersarevermin
Guest
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| Posted:
Fri Nov 25, 2005 9:20 am Post subject:
Re: Simplest hardware node |
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On 23 Nov 2005 22:17:19 -0800, bmearns blurted:
| Quote: | I'm looking for the simplest possible hardare implementation that I can
connect via cat5 ethernet cable to my router that my router will
recognize as a node on the network, and be willing to send it data,
even if that data is simply dropped on the floor, so to speak.
Is it possible to just use a power supply and ground to set certain
pins on the cable a constant high or low?
Any help is greatly appreciated. Thanks.
|
www.edtp.com packet whacker
www.lantronics.com
http://www.rabbitsemiconductor.com/
etc...
HTH
Spamming this account signifies
your unqualified consent to a free security audit |
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Gerard Bok
Guest
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| Posted:
Fri Nov 25, 2005 4:36 pm Post subject:
Re: Simplest hardware node |
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On Thu, 24 Nov 2005 19:50:01 -0500, James Knott
<james.knott@rogers.com> wrote:
| Quote: | Gerard Bok wrote:
Or a cheap hub or switch. They might be more readily available.
Are you sure a router would actually dump data to a hub or switch
without any other connection ?
Something like UDP or ICMP would work fine, as they don't require a
"connection" to the other computer, the way TCP does. All they need, is a
working network connection and they don't care what's beyond.
|
Sorry, but that's not what I meant.
Your 'connection' is a logical one.
I was refering to the lack of a physical connection.
UDP or ICMP need a link to travel on. I think :-)
Think 127.0.0.1. Always connected, never a signal :-)
--
Kind regards,
Gerard Bok |
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glen herrmannsfeldt
Guest
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| Posted:
Fri Nov 25, 2005 5:20 pm Post subject:
Re: Simplest hardware node |
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James Knott wrote:
(I wrote)
| Quote: | Oh, that's what you mean.
A 10baseT transceiver and a power supply should do it.
Or a cheap hub or switch. They might be more readily available.
|
He ask for the simplest. I have heard of people powering a transceiver
off a standard 9 volt battery, though probably not for very long.
I used to know a machine with automatic AUI/10base2 switching which
relied on a minimum current through the AUI power pins to do the
switching.
It is probably now so hard to build the logic to generate link pulses,
but transceivers are already designed to do that.
-- glen |
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James Knott
Guest
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| Posted:
Sat Nov 26, 2005 5:20 pm Post subject:
Re: Simplest hardware node |
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glen herrmannsfeldt wrote:
| Quote: | Or a cheap hub or switch. They might be more readily available.
He ask for the simplest. I have heard of people powering a transceiver
off a standard 9 volt battery, though probably not for very long.
|
Or, if he can find one, and old 10base2 NIC, a T coupler and a pair of
terminators should do it too. He could also use a 24 ohm resistor, in
place of the coupler and two terminators. Can't get much simpler than
that. |
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Gerard Bok
Guest
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| Posted:
Sat Nov 26, 2005 5:20 pm Post subject:
Re: Simplest hardware node |
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On Sat, 26 Nov 2005 07:25:26 -0500, James Knott
<james.knott@rogers.com> wrote:
| Quote: | glen herrmannsfeldt wrote:
Or a cheap hub or switch. They might be more readily available.
He ask for the simplest. I have heard of people powering a transceiver
off a standard 9 volt battery, though probably not for very long.
Or, if he can find one, and old 10base2 NIC, a T coupler and a pair of
terminators should do it too. He could also use a 24 ohm resistor, in
place of the coupler and two terminators. Can't get much simpler than
that.
|
It seems to get simpler and simpler :-)
But how would an ancient NIC (unpowered ?) and a 24 ohm resistor
been recognized (as a node) by a router, let alone tempt it to
transmit data ?
--
Kind regards,
Gerard Bok |
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James Knott
Guest
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| Posted:
Sun Nov 27, 2005 12:58 am Post subject:
Re: Simplest hardware node |
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Gerard Bok wrote:
| Quote: | Or, if he can find one, and old 10base2 NIC, a T coupler and a pair of
terminators should do it too. He could also use a 24 ohm resistor, in
place of the coupler and two terminators. Can't get much simpler than
that.
It seems to get simpler and simpler :-)
But how would an ancient NIC (unpowered ?) and a 24 ohm resistor
been recognized (as a node) by a router, let alone tempt it to
transmit data ?
|
I would assume that if he's trying to send data, he'd have a NIC somewhere.
If he can plug in a 10base2 NIC, that should do. It gets the power from
the computer. All he needs is a NIC of some time that's connected to a
real circuit. With twisted pair, that means he needs a switch or hub to
plug into, with coax type NIC, he only needs the proper termination. |
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Gerard Bok
Guest
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| Posted:
Sun Nov 27, 2005 4:57 am Post subject:
Re: Simplest hardware node |
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On Sat, 26 Nov 2005 13:58:18 -0500, James Knott
<james.knott@rogers.com> wrote:
| Quote: | Gerard Bok wrote:
Or, if he can find one, and old 10base2 NIC, a T coupler and a pair of
terminators should do it too. He could also use a 24 ohm resistor, in
place of the coupler and two terminators. Can't get much simpler than
that.
It seems to get simpler and simpler :-)
But how would an ancient NIC (unpowered ?) and a 24 ohm resistor
been recognized (as a node) by a router, let alone tempt it to
transmit data ?
I would assume that if he's trying to send data, he'd have a NIC somewhere.
If he can plug in a 10base2 NIC, that should do. It gets the power from
the computer. All he needs is a NIC of some time that's connected to a
real circuit. With twisted pair, that means he needs a switch or hub to
plug into, with coax type NIC, he only needs the proper termination.
|
He wants the cheapest device that will lure his router into
sending actual data to it.
I can only see a NIC qualify his needs if this NIC is placed in a
more or less fully functional PC.
Am I missing something here ?
--
Kind regards,
Gerard Bok |
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glen herrmannsfeldt
Guest
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| Posted:
Sun Nov 27, 2005 9:20 am Post subject:
Re: Simplest hardware node |
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James Knott wrote:
| Quote: | glen herrmannsfeldt wrote:
Or a cheap hub or switch. They might be more readily available.
He ask for the simplest. I have heard of people powering a transceiver
off a standard 9 volt battery, though probably not for very long.
Or, if he can find one, and old 10base2 NIC, a T coupler and a pair of
terminators should do it too. He could also use a 24 ohm resistor, in
place of the coupler and two terminators. Can't get much simpler than
that.
|
Maybe I missed something, but I believe most 10baseT devices won't send
data out unless they see link pulses coming in. A source of link pulses
can be convenient in testing. One can then do whatever one wants with
the bits coming out from the device.
-- glen |
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James Knott
Guest
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| Posted:
Sun Nov 27, 2005 5:20 pm Post subject:
Re: Simplest hardware node |
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glen herrmannsfeldt wrote:
| Quote: | Maybe I missed something, but I believe most 10baseT devices won't send
data out unless they see link pulses coming in. A source of link pulses
can be convenient in testing. One can then do whatever one wants with
the bits coming out from the device.
|
I said 10base2, which is the old coax type ethernet. IIRC, it doesn't use a
link pulse. However, a baseT connection to a hub or switch should be OK as
the link pulse is use to check the connection to the hub/switch, not to
verify there's another computer on the network
.. |
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