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J. Clarke
Guest
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 Posted:
Tue Feb 22, 2005 2:23 am Post subject:
Re: Anything faster I can run on Thinnet? |
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James Knott wrote:
| Quote: | Gerard Bok wrote:
Since the impedance of 'thinnet coax' is identical to that of thick
Ethernet coax, clearly any system that will run on one will run on the
other; the only question is the reduction in length for acceptable
levels of operation.
Sorry, but I have to disagree here.
Basically, both cables should at least comply to the same specs.
That, I agree to.
But from a practical point of view:
A typical thicknet cable is Belden 9880.
6.9 dB per 100 feet attenuation at 1000 MHz, 11.5 dB at 2.5 GHz
(So it would be suitable for 'Wifi')
A typical thinnet cable is Belden 9907
14.8 dB per 100 feet at 1000 MHz, 2.5 GHz not even specified :-)
As you see: size does matter, at least if you want to run
something else over an existing cable.
1) Last I heard, ethernet over coax does not use frequencies anywhere near
2.5 GHz.
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Ethernet over coax doesn't. It was suggested that 802.11a, b, or g be
tried. Those run at 2.5 or 5 GHz.
| Quote: | b) I guess you missed the point "the only question is the reduction in
length for acceptable levels of operation".
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--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net) |
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Jonathan Sturges
Guest
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| Posted:
Tue Feb 22, 2005 8:19 pm Post subject:
Re: Anything faster I can run on Thinnet? |
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sphealey wrote:
| Quote: | Trying to patch a bad situation for a few months until we can get a
fiber contractor into our semi-rural mfg facility. Is there
anything
faster than 10 Mb that I can run over Thinnet cable?
Can you go wireless? You didn't say what the distance was, or if
there
were obstructions that would make this impossible.
Good thought, but I truely doubt wireless would work in that
facility/environment.
sPh
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Well don't dismiss it too quickly. If you know you have lots of 2.4Ghz
noise, for example, use 802.11a (5.8Ghz). Or vice-versa.
Considering you can get clean, LOS ranges of several miles outdoors with
commonly-available antennae, I bet there's a chance you can make this
work indoors. What's the approximate distance?
-Jonathan |
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Jonathan Sturges
Guest
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| Posted:
Tue Feb 22, 2005 8:29 pm Post subject:
Re: Anything faster I can run on Thinnet? |
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sphealey wrote:
| Quote: | William wrote:
"sphealey" <sphealey@worldnet.att.net> wrote:
faster than 10 Mb that I can run over Thinnet cable?
Bail us out here, and tell us how long the existing cable is! 8*)
[I kinda like the idea of using the cable _shield_ as an antenna!]
Sorry dudes - I had to go back and look at my own original post as I
thought I had included that information. Which I had not ;-(
Length is over 100m - about 125 I think. Longer than 10' for sure.
sPh
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125m is definitely a possibility for wireless, as long as you have LOS.
Even if it's somewhat noisy, I think you stand a good chance of being
able to get over 10mbps. You will need some good Pringles antennas. :-)
-Jonathan |
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sphealey
Guest
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| Posted:
Wed Feb 23, 2005 1:41 am Post subject:
Re: Anything faster I can run on Thinnet? |
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| Quote: | 125m is definitely a possibility for wireless, as long
as you have LOS. Even if it's somewhat noisy, I think
you stand a good chance of being able to get over 10mbps.
You will need some good Pringles antennas.
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This is a factory environment with changes of levels, metal grating,
steel roofing, and a welding shop with what amounts to a faraday cage
around it in between! No LOS here I am afraid. That is why we are
putting in fiber, but finding fiber contractors willing to do
industrial quality work in rural locations for less than the book value
of the entire facility is difficult.
I think we are going to have to call this one dead and buried. Anyone
know where I can go to fiber splicing school?
sPh |
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J. Clarke
Guest
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| Posted:
Wed Feb 23, 2005 3:14 am Post subject:
Re: Anything faster I can run on Thinnet? |
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sphealey wrote:
| Quote: | 125m is definitely a possibility for wireless, as long
as you have LOS. Even if it's somewhat noisy, I think
you stand a good chance of being able to get over 10mbps.
You will need some good Pringles antennas.
This is a factory environment with changes of levels, metal grating,
steel roofing, and a welding shop with what amounts to a faraday cage
around it in between! No LOS here I am afraid. That is why we are
putting in fiber, but finding fiber contractors willing to do
industrial quality work in rural locations for less than the book value
of the entire facility is difficult.
I think we are going to have to call this one dead and buried. Anyone
know where I can go to fiber splicing school?
|
If I might make a suggestion, _try_ two pulls of UTP, one for your longest
run and one that you believe to be your worst case for interference, and
see what happens. You may be pleasantly surprised. And if you aren't you
haven't spent much.
If the regs where you are located allow you to pull your own fiber, then one
option would be to measure out the pulls and order connectorized cable in
appropriate lengths, and just be careful not to pull it too hard, bend it
too tight, or bust the connectors. Don't know if it's still the case but
once you needed about a thousand bucks worth of tooling to put connectors
on fiber.
--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net) |
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Hansang Bae
Guest
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| Posted:
Wed Feb 23, 2005 8:03 am Post subject:
Re: Anything faster I can run on Thinnet? |
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J. Clarke wrote:
| Quote: | If I might make a suggestion, try two pulls of UTP, one for your
longest run and one that you believe to be your worst case for
interference, and see what happens. You may be pleasantly surprised.
And if you aren't you haven't spent much.
[snip] |
Or try one of those Pre-N wireless APs. In my condo, I could never get
Cisco AP-340/350's to connect across the bedrooms! Just 20' or so
apart, but something caused the notebook to never connect.
So I tried the Linksys SRX AP and NIC. Now I get signals that are
EXTREMELY strong. Well worth the money.
--
hsb
"Somehow I imagined this experience would be more rewarding" Calvin
**************************ROT13 MY ADDRESS*************************
Due to the volume of email that I receive, I may not not be able to
reply to emails sent to my account. Please post a followup instead.
******************************************************************** |
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