| Author |
Message |
Larry Martell
Guest
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 Posted:
Thu Jan 20, 2005 3:43 am Post subject:
Point to point communications over 100baseT |
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I have a requirment to communicate between 2 PC's over a point to
point connection at 33Mbps. Other then LVDS what comm protocal
supports these speeds? (I know USB does, but I have not found
a USB host<-->host bridge that supports those speeds.) I know
ethernet does, but I've never seen it used in this manner. Is it
possible to directly connect 2 machines with a 100baseT cable
and just talk to each other without TCP/IP? Is there software
that supports such a beast?
Thanks!
-larry |
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Walter Roberson
Guest
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| Posted:
Thu Jan 20, 2005 5:12 am Post subject:
Re: Point to point communications over 100baseT |
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In article <1106174611.055491.178180@c13g2000cwb.googlegroups.com>,
Larry Martell <natkelcri@yahoo.com> wrote:
:I have a requirment to communicate between 2 PC's over a point to
:point connection at 33Mbps.
:Is it
:possible to directly connect 2 machines with a 100baseT cable
:and just talk to each other without TCP/IP?
Yes.
:Is there software that supports such a beast?
Is there a particular need for it to not be TCP based? If so is there
also a requirement that it not be IP based? 33 megabits per second
of payload is well within the capabilities of any modern TCP or IP
stack.
In any case, you can write out raw ethernet packets, and the other end
can read raw ethernet packets. You'll have a little bit of difficulty
in getting the receiver's NIC to accept the packets. I suggest that
you look at 'libpcap' which is well able to do the appropriate
setup for capturing arbitrary packets.
--
Cottleston, Cottleston, Cottleston pie.
A bird can't whistle and neither can I. -- Pooh |
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Dale Farmer
Guest
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| Posted:
Thu Jan 20, 2005 8:08 am Post subject:
Re: Point to point communications over 100baseT |
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Larry Martell wrote:
| Quote: | I have a requirment to communicate between 2 PC's over a point to
point connection at 33Mbps. Other then LVDS what comm protocal
supports these speeds? (I know USB does, but I have not found
a USB host<-->host bridge that supports those speeds.) I know
ethernet does, but I've never seen it used in this manner. Is it
possible to directly connect 2 machines with a 100baseT cable
and just talk to each other without TCP/IP? Is there software
that supports such a beast?
Thanks!
-larry
|
Sure, just use a crossover cable instead of a straight through
cable.
What distance do you need to do this at? If you are talking more than
the hundred meter limit of UTP without a repeater, then you start to
hit a bunch of issues that make it way more expensive. You do need
a good set of NICs, preferably matching ones to reduce finger pointing
from vendors blaming the other guy rather than solving problems.
--Dale |
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Tomi Holger Engdahl
Guest
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| Posted:
Thu Jan 20, 2005 5:43 pm Post subject:
Re: Point to point communications over 100baseT |
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"Larry Martell" <natkelcri@yahoo.com> writes:
| Quote: | I have a requirment to communicate between 2 PC's over a point to
point connection at 33Mbps. Other then LVDS what comm protocal
supports these speeds?
|
100 Mbit/s comes to my mind first.
| Quote: | (I know USB does, but I have not found
a USB host<-->host bridge that supports those speeds.) I know
ethernet does, but I've never seen it used in this manner. Is it
possible to directly connect 2 machines with a 100baseT cable
and just talk to each other
|
Sure, just use a crossover cable instead of a straight through
cable. With a crossover cable you can connect two PCs
directly to each other. I have done this many times.
| Quote: | without TCP/IP? Is there software that supports such a beast?
|
Ethernet and TCP/IP usually come together.
But there is no need to use TCP/IP protocol with Ethernet.
Ethernet can support many different protocols, and with
suitable software you can just send and receive "raw"
Ethernet packets.
--
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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Thomas Decker
Guest
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| Posted:
Sat Jan 22, 2005 3:45 pm Post subject:
Re: Point to point communications over 100baseT |
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"Dale Farmer" <dale@cybercom.net> wrote:
| Quote: |
Larry Martell wrote:
I have a requirment to communicate between 2 PC's over a point to
point connection at 33Mbps. Other then LVDS what comm protocal
supports these speeds? (I know USB does, but I have not found
a USB host<-->host bridge that supports those speeds.) I know
ethernet does, but I've never seen it used in this manner. Is it
possible to directly connect 2 machines with a 100baseT cable
and just talk to each other without TCP/IP? Is there software
that supports such a beast?
Thanks!
-larry
Sure, just use a crossover cable instead of a straight through
cable.
What distance do you need to do this at? If you are talking more than
the hundred meter limit of UTP without a repeater, then you start to
hit a bunch of issues that make it way more expensive. You do need
a good set of NICs, preferably matching ones to reduce finger pointing
from vendors blaming the other guy rather than solving problems.
--Dale
|
If you're talking more than 100 meter, you can either go to fiber-based
Ethernet solutions (100BASE-FX/LX10/BX10), or to 10PASS-TS.
10PASS-TS will give you (more than) 33 Mbps over several hundred meters of
voice-grade twisted pair. It is part of the recently approved "Ethernet in
the First Mile" standard (IEEE Std 802.3ah-2004) and is based on VDSL. There
are proprietary (pre-standard) solutions available on the market as well.
Michael (remove "filter" from email address)
http://www.ethernetinthefirstmile.com |
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