Electric Fence

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louisp

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Hi,

I want to know:

How does an electric fence influence your ADSL line? Telkom seems to be trying to tell me that because of my neighbours electic fence. I can not get ADSL. The overhead cable is indeed over the electric fence, but I can not hear that much of an interference?

So, would an electric fence degrade the line by that much to render ADSL service impossible?

:)
 
Last edited:
Yep,

I've had it before ... electric fence induced interference on my line so that my dial modem couldn't hold carrier for more than 10min (assume ADSL is affected similarly).

Fence was parallel to my line for a 2 m stretch. Even though it was a 1m away and otherside of a brick wall, it managed to induce a faint tick, tick (electric fences pulse voltage every sec. or so) which corrupted data/carrier.

This was verified by asking my neighbour to turn off their fence for a while ... problem disappeared.
 
It can create EMF or line noise

BUT... have they actually tested it yet? Do you hear any audible noise on your line?

I suspect they are just worried about the techie falling off his ladder onto the fence:D
 
Grrr,

Still some hope left, as Dial-up and ADSL work a bit differently.

I'll try and force them to complete the installation so that we can test it.

:)
 
My experience: My line runs parrallel to my neigbours electric fence for about 25m, approx 1.5-2m above the fence, and I have no problems. I guess the distance beteen the two makes a big difference.
 
I have an electric fence at my home. My ADSL line crosses over the fence to get from the telephone pole to my home. I have had no problems with the line as a result of the electric fence.
 
Just spoke to Telkom.

They informed me that they tested the line and they had too many errors...

MAN i'm just so frustrated, they site the electric fence as the culprit but how wil I ever know. It might be that their cabling is up to ****.

Iburst and 3G too expensive, Telkom unable too provide ADSL, how in the hell am I going to get tha Internet at home????

/sigh

:(
 
maybe try sentech.. I used them at the beginning and they really sucked then. But from what I hear they have improved quite a bit....
 
Sentech doesn't seem to provide cover in my area, and iBurst is marginal.

The Cable is parallel to the fence for atleast 70m. And its one of those "full" electric fences. ie. no wall just electric cabling.
 
Let telkom techie reroute your incoming cable, you will get more: avoid the interference and brand new cable (very important for ADSL). How? find out yourself, but I promise you it's 100% workable (esp in SA) ;)
 
Normaly the copper is twisted pair, is it not possible for the cable to have a shield applied? Try Wrapping Foil around the cable where it runs near the fence and then attatching that foil to ground. The best would be some sort of copper foil.
 
I'd get T31k0m to do that

Byrd said:
Normaly the copper is twisted pair, is it not possible for the cable to have a shield applied? Try Wrapping Foil around the cable where it runs near the fence and then attatching that foil to ground. The best would be some sort of copper foil.
Click to expand...

Ha Ha

Just ask T31k0m nicely to re-route your cable. Sheilded pair should work nicely though... Maybe T31k0m haven't thought of it. Offer to supply them with cat5e shielded if they are too stingy to buy it themselves. I don't envy you - I don't think it will be easy to get them to do, but it's worth a shot.
 
I have my house surrounded by electric fences and there are two of them that are extremely high voltage...like mine and I have not had a problem...okay I am in Jeddah at the moment....but my family does not have a problem.
 
RolandD said:
My experience: My line runs parrallel to my neigbours electric fence for about 25m, approx 1.5-2m above the fence, and I have no problems. I guess the distance beteen the two makes a big difference.
Click to expand...
The amount of interfereance will mostly have to do with magnetic coupling between the to wires (fence and telephone) Now there are 4 things that affect the magnetic coupling between 2 wires:

The magnetic field is proportional to the current flowing in the wires. Electric fences are very high voltage but they should not be high current (resulting in a high magnetic field) as high current will kill people who touch it and this is in fact illegal.

As has been mentioned - the distance between wire has an effect. The magnetical coupling reduces drastically as the distance increases.

Then the angle between the wires - wires running perpendicular have minimal (ideal world - none) coupling whereas wires running parallel will have a lot of coupling. So when telephone wires cross an electric fence they should not be noticably affected.

Finally the geometry of the cables - ie their arrangement within the bundle. I won't go into details but having the cables twisted is generally the best for reducing interferance. If the lines were manufactured and installed correctly they should have some twisting build into them. Not as much as a twisted pair cable but it should be sufficient for most senarios. And besided UTP has no strengthening cables built into it so it would not work to be strung between poles - it would get ripped down in the first little bit of wind.
 
Get them to trench it as most cables are being layed underground nowadays neway we had Telkom do this at our office building

Ok so it took 4 months to finally get them to do it but what option do u have....

:|
 
Thanks ambo, that's a nice explanation.

I was wondering if it is possible to filter out the low frequency noise caused by the fence, similar to the way the ADSL noise if filtered from the phone line. Instead of a low-pass you just have a high pass filter. I'd like to see what the signal looks like, there may be a market for this device ?!?.
 
It is an unfortunate position you're in.
:confused:

- It is for sure the disturbance caused by the electrical fence thats causing you your troubles.

I had to re- route a guys telephone cable for 4 km, to solve the same problem ....

He had a lot of money , though , and could afford to send telkom 's
promisses to hell.

HOPE !!! :D:D ...

Find out if the persons who's fence is running
parralal to your ASDL line is earthed properly, or at all.
Trust me .. Bang in a few earth spikes along the parralal
route , connected to all of his earth wires on the fence ,
and you should have no more problems.

That ticking sound you hear , is because of inadiquate earthing.
An earth spike shouldn't cost more than R40 each , and 1
should be slammed in for at least every 40 meters of running
fence... but in your case , double it !!

Happy surfing

:)
 
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