Article View: sci.electronics.misc
Article #163Re: Telephone line vs. electric fence
From: dr.dongle
Date: Mon, 29 May 2000 00:00
Date: Mon, 29 May 2000 00:00
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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 Sent via Deja.com http://www.deja.com/ Before you buy.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1131b0,cc622b6f0b967e73 X-Google-Attributes: gid1131b0,public X-Google-Thread: f4a69,cc622b6f0b967e73 X-Google-Attributes: gidf4a69,public X-Google-Thread: 107cee,53450031bd42975d X-Google-Attributes: gid107cee,public From: dr.dongle@juno.com Subject: Re: Telephone line vs. electric fence Date: 2000/05/29 Message-ID: <8gspvu$mk0$1@nnrp1.deja.com> X-Deja-AN: 628459023 References: <0o2X4.1567$ra2.94011@newsfeed.intelenet.net> <392df490@dnews.tpgi.com.au> X-Http-Proxy: 1.1 x67.deja.com:80 (Squid/1.1.22) for client 216.80.150.45 Organization: Deja.com - Before you buy. X-Article-Creation-Date: Mon May 29 04:00:05 2000 GMT X-MyDeja-Info: XMYDJUIDdr_dongle Newsgroups: sci.electronics.misc,sci.electronics.repair,fido.phones X-Http-User-Agent: Mozilla/4.0 (compatible; MSIE 4.01; Windows 95; Juno)