Impedance is important. Stick to RG58A/U. RG59 will not offer good
performance, and RG6 likewise. Also avoid playing with different
connectors - BNC only.
Anything that carries an honest RG58A/U designation is adequately shielded.
You can use some of the more specialized coax, like Belden stuff, if it's
50 ohm and not too far off on Vp and capacitance/1000ft. But straight 59
will do just fine. Spend your money on RAM.
Thin net is too simple to fool with.
Rick
At 09:53 AM 1/6/00 -0500, John LeMay wrote:
>This may be (ok, it IS) bordering on off topic, but what requirements were
>there for coax? For example, could I use any RG8 such as RG8-U, RG8-X, etc?
>
>What if I tried to use RG6 or RG59 (~72 ohm impedence as opposed to 50 ohm
>in RG8 and RG58) This makes little difference in the RF world. Is it
>different in the network world?
>
>What about shielding? Obviously the more the better, but were there minimum
>requirements?
>
>Has anyone ever tried running over Belden 9914 hardline or some of the other
>high end coax available?
>
>-----Original Message-----
>From: Mark H. Wood [mailto:[EMAIL PROTECTED]]
>Sent: Thursday, January 06, 2000 6:14 AM
>To: unlisted-recipients
>Cc: linux-net
>Subject: Re: on topic this time :)
>
>
>A couple of thoughts:
>
>o Yes, good old RG8 Etherhose is alive and well. I was gratified to
> see that we still have some in the ceilings giving good service,
> despite the advent of UTP. Ethernet runs 10mb/s over RG8
> (thickwire), RG58 (thinwire), or UTP and thick is rated for the
> greatest distance between repeaters.
>
>o I don't think that RG8 is rated for outdoor or buried
> applications, though. You'll need to install it in ducts if you
> plan to put it underground.
>
>o 1500m is still not a lot of distance. Consider optical carriers,
> for which you *can* find outdoor cable since telcos use so much of
> it.
>
>o I don't know what things cost in SA, but in US the cost of putting
> cables in the ground or hanging them on the poles is going to
> make the cost of buying the cables look insignificant. Plus you
> have to pay to acquire right-of-way through private property, or
> to use some other utility's right-of-way. Outside plant is
> incredibly expensive.
>
>o Check your local laws to see what regulations might affect your
> organization. Do you have to register with the government as a
> common carrier? then how are you obliged to behave? You need a
> lawyer.
>
>--
>Mark H. Wood, radical centrist OpenPGP ID 876A8B75
>[EMAIL PROTECTED]
>01/01/00 00:00:00 -- Apocralypse Now
>
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