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Re: [TowerTalk] Using Plenum Plenum Cable

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Using Plenum Plenum Cable
From: Gerald Boutin <towertalk@infinichron.com>
Date: Wed, 21 Jun 2006 21:21:51 -0600
List-post: <mailto:towertalk@contesting.com>
Roger,

T in Base-T indicates twisted pair
2 in Base-2 refers to a maximum of 200 meter long segments using thin coax
5 in Base-5 refers to a maximum of 500 meter long segments using thick coax

Now, if you were around in the good old days, how comes you don't remember
Base-2 and Base-5? :) In computer years, those good old days were only a
decade or two ago.

Hmm, come to think of it, I can't remember whether coaxial LAN cable was 50
or 75 ohms. Oh, well. I do remember that it was no fun chasing an
intermittantly open BNC T-connector.

--
Gerald Boutin, VE6WA

>
> On Jun 21, 2006, at 10:55 AM, K8RI on Tower talk wrote:
>

I'm familiar with 10 base T, 100 Base T, and gigabit used for listing 
equipment speeds. I'd just never seen it used with cable listings.  I use 
Cat5e for a gigabit LAN.

"In the old days" we only had to worry about fire blocks at walls and 
bulkheads.  Cat5e would have never been allowed as it is hollow. It's more 
like a tube about 2/3 filled with wires. That's also one of the reasons the 
stuff is difficult to get around corners as the tube colapses and is easily 
kinked.

> etc., cables.  As opposed to 10base-2 which used 50-ohm coax.  I

I wonder why they use the nomenclature base T and base 2?

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2

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