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Article View: sci.electronics.misc
Article #163

Re: Telephone line vs. electric fence

#163
From: dr.dongle
Date: Mon, 29 May 2000 00:00
130 lines
5640 bytes
In article <392df490@dnews.tpgi.com.au>,
  "*Marv*" <marv@tpg.com.au> wrote:
> If you are able to replace the cable, you can, as they say " Shoot 3
birds
> with 1 stone". (well, you get an bonus bird with this scenario).
> You will be able to get rid of the noise on the line as well as have a
> connection for a telephone line and a Computer Network link between
both
> buildings.
>
> I suggest doing the following :
>
> Replace the cable with Shielded Twisted Pair (STP) Data Cable.
>         The cable here in Australia costs AU $0.36 / Metre .. so it's
not
> all that expensive.
>         The Cable has 4 pairs of conductors where each pair is
twisted. (8
> Conductors in total)
>         You will be able to use this cable to carry both the
Telephone line
> to the other building, as well as run a networked computer.
>
> Purchase 2 Dual RJ45 Shielded Sockets (one for the main building, and
one
> for the other building)
>         An RJ45 Socket is the same type of fitting that's found on
the back
> of all modern Computer network cards.
>         The Dual RJ45 Shielded Sockets should cost about AU $15.00
each.
>         (You will need Dual sockets, because 1 socket will be used
for the
> telephone connection and the other for the Computer Network
connection)
>
> Terminate the cable at both ends to the RJ45 Sockets in the following
way:
>
>         ( Building 1's Dual socket is labeled 1A and 1B, Building 2's
Dual
> Socket is labeled 2A and 2B)
>
>          ------------------------------------------------
>           This is the wiring for Sockets "A" which will be used for
the
> Computer Network connection.
>          ------------------------------------------------
>           Socket 1A -- Pin 1 ===== Pin 3 -- Socket 2A
>           Socket 1A -- Pin 2 ===== Pin 6 -- Socket 2A
>
>           Socket 1A -- Pin 3 ===== Pin 1 -- Socket 2A
>           Socket 1A -- Pin 6 ===== Pin 2 -- Socket 2A
>          ------------------------------------------------
>           This is the wiring for Sockets "B" which will be used for
the
> telephone link.
>          ------------------------------------------------
>           Socket 1B -- Pin 4 ===== Pin 4 -- Socket 2B
>           Socket 1B -- Pin 5 ===== Pin 5 -- Socket 2B
>
>           Socket 1B -- Pin 7 ===== Pin 7 -- Socket 2B
>           Socket 1B -- Pin 8 ===== Pin 8 -- Socket 2B
>          ------------------------------------------------
>
>         Each of the 4 pairs of cables are twisted together, make sure
you
> don't " Split the pairs".
>         ie: use pins 1&2 for one pair, pins 3&6 for the next pair,
then pins
> 4&5 and then 7&8 for the last pair.
>         If you "Split the pairs", you will loose the signal ballance,
and
> noise will be generated within the cable.
>
>         The STP Cable has a small bare earthing wire that runs just
under
> the aluminum earthing shield.
>         The RJ45 Shielded sockets have a metal enclosure to which you
can
> terminate the earthing wire.
>         DO NOT terminale this earthing wire on both ends of the STP
Cable,
> terminate ONLY ONE END (doesn't matter which).
> The reason you don't is because you will get what is called a "
Grounding
> Loop", which will actually CARRY electrical current along the shield
of the
> cable from one building to the other. What you want to do is SHIELD
your
> cable from the energy created by the electric fence, not provide an
> "electrical earth return" from one building to the other.
> (I am not going to go into detals why this can cause problems but
there are
> electrical safety issues relating to creating grounding loops.)
>
> Finally, All you need to do is use Socket A on both ends for your
Computer
> Network ... and, Socket B on both ends for your telephone connection.
> You will have to purchase leads to plug between the Computer Network
card
> and the RJ45 socket -- these have an RJ45 Plug on each end and cost
only a
> few dollars each.
> You will need to use a Shielded (STP) Lead to connect your computer
to the
> socket that you have attached the Grounding wire to. (The other leads
do not
> need to be shielded types).
>
> I hope this has not been too confusing for you.
> Good luck.
>
>
 Running Data to gether in the same cable is a perscriptionm for
trouble and I recomend against it. Run seprate cables.

 As to the RF from the fence charger, try a .001 uf 400 v cap accrost
the pair at each end and to ground as well.

 dr.d
--
 Stop the madness vote Libertarian!
All it takes for EVIl to triumph is for good people to do nothing!
-Edmond Burke-
 Chris Snyder, Cosby, Tn. KD4 OGD


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From: dr.dongle@juno.com
Subject: Re: Telephone line vs. electric fence
Date: 2000/05/29
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