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Ethernet between two houses

Discussion in 'Electrics UK' started by gbrown100, 15 Sep 2020.

  1. JohnW2

    JohnW2

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    OK, so it would between one layer and the next - but, even then, it's not uncommon to have insulation between the barriers.
    The 'barrel scraping' referred to the discussion in general since, just like you, it would not occur to me to even consider the need for additional isolation between systems or buildings! Are the wired ethernet connections we're talking about any more a 'cause for concern' than, say, the public telephone network?
    Yep - but optically-isolated copper would probably be almost as good (the only uncertainty would be the 'withstand voltage of the opto-isolators) - or, of course, 'wireless.

    Kind Regards, John
     
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  3. JohnW2

    JohnW2

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    What sort of transformers adopt that approach?

    Kind Regards, John
     
  4. bernardgreen

    bernardgreen

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    among other uses

    Isolation transformers on low noise audio circuits
    Radio frequency power amplifier oputs ( more for purity of the sine wave )
    Modem line inter-face transformers
     
  5. JohnW2

    JohnW2

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    OK, but, if they utilise enamelled wires, I presume that approach would not be used if one wanted appreciable 'voltage isolation' between the windings?

    I have little experience of the first and third applications you mention but, as for "RF power amp outputs", the most common arrangement I have dealt with has involved no physical contact at all between the primary and secondary windings, let alone having them twisted together (which presumably produces all sorts of issues in relation to capacitive coupling) - what sort of RF frequencies are you thinking of?

    Kind Regards, John
     
  6. SUNRAY

    SUNRAY

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    But this won't provide the KV's of isolation required for Ethernet use.
     
  7. Harry Bloomfield

    Harry Bloomfield

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    https://docs.rs-online.com/167e/A700000006829303.pdf

    Shows the spec. of a typical LAN isolation unit, typically built into a all network interfaces. The test voltage is 1500volts, which they have to survive successfully for 1 minute. Assuming such a network interface at each end of a LAN cable, that would mean 3000v worth of isolation between the two PC's.
     
  8. JohnW2

    JohnW2

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    That's roughly what I would have expected and, as I've implied, I think that is 'more than enough for me'!

    Kind Regards, John
     
  9. bernardgreen

    bernardgreen

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    This is the point I am trying to make.

    Prevention of physical damage by isolation is not the same as prevention of data corruption.

    Providing isolation can compromise the prevention of data corruption and at the same time providing prevention of data corruption can compromise the safety isolation.

    The better the safety isolation the higher the data error rate in situations where the safety isolation was necessary to protect the hardware.
     
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  11. Harry Bloomfield

    Harry Bloomfield

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    I'm really confused as to what point is trying to be made here. I think we have now proven that safety wise there is no issue with two adjacent properties sharing a LAN connection, even if they are on differing phases of mains supply. Data rates will be at full specified speed upto 100m without any special precautions, providing the correct spec of LAN cable is used, besides which some small amount of corruption of data is normal and taken care of by checksums, plus repeated sending of data. The twisted pair design of such cable is intended to reject any local interference along the route of the cable, which is why it is so important to use the proper pairs.
     
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  12. Taylortwocities

    Taylortwocities

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    @gbrown100

    how are you enjoying the consultation process? Was wondering if you’ve decided how to do this?
    Hopefully you’ve decided, after a couple of weeks and more than 80 posts.
     
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  13. Harry Bloomfield

    Harry Bloomfield

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    Nowt much wrong with a lengthy technical discussion thread - especially true if it remains calm, rather than combative.
     
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  14. Taylortwocities

    Taylortwocities

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    That wasn’t my reason. The OP hasn’t said anything for nearly two weeks.

    Not sure if he needs anymore input.
     
  15. Harry Bloomfield

    Harry Bloomfield

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    It doesn't really matter, because it's there in the thread to be read, should anyone else have a need to solve a similar problem.
     
  16. motorbiking

    motorbiking

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    Had a quick read of vodafones BB terms as an example and the definition of "you" is not restricted. Quite the reverse in fact, so as long as you aren't reselling the service, I can't see an issue. I imagine they are all similar. With regard to Copyright, Designs and Patents Act 1988, there would be minimal mileage in arguing that you were distributing copyrighted material and certainly not beyond the scope of s28A. As simple agreement describing the "terms of use" would cover the contract holder fairly well. In general you can't be criminally accountable for other people criminal action if you weren't a party to it. That would get a bit silly.
     
  17. JohnW2

    JohnW2

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    Whilst that is true, I think the issue that some people were concerned about was that if the internet connection were used for some criminal purpose (particularly things related to 'child porn' etc.), if it were detected it would be on the basis of the IP address of the connection. It could then be a devil of a job, and potentially very distressing in all sorts of ways, to have to try to convince the police that the guilty party was one's neighbour on the end of an ethernet cable, rather than oneself.

    Kind Regards, John
     
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