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    Faceplate wiring and low SNR

    This is a discussion on Faceplate wiring and low SNR within the Cabling and faceplate help forums, part of the Sky Broadband help and support category; Hi I have recently checked the SNR ratio on my line and it is very low (1-2 db). I think ...

    1. #1
      garyevs's Avatar
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      Faceplate wiring and low SNR

      Hi

      I have recently checked the SNR ratio on my line and it is very low (1-2 db). I think I may have a problem with the way my socket is wired. It was installed by a BT engineer some years ago, but it just does not look right.

      Before I had broadband, I had a second line in the house, BT ran both lines off the same cable. I also had a hardwired extension cable running to other phones in the house. I would not expect the engineer to have been confused by all this, but you never know.

      The second line has now been removed and I no longer use the extensions in other areas of the house, though the cables are still in place.

      I have an original BT "ADSL v1.0" master socket. The ADSL line runs via a RJ45 plug directly to a RJ11 socket, which my router plugs into. I just have one cordless phone plugged into the phone socket. I do not have a filter on this phone, as I understand that this socket is already filtered.

      I had a look at the reverse of the backplate as well, and the socket is wired as follows:

      The 2 blue/white wires from the incoming cable are connected to the terminals at the top of the reverse of the backplate (A & B). All the other wires in the incoming cable are unused.

      The 2 blue/white wires and 1 orange wire from the (now unused) extension cable are connected to the 3 terminals on the rear of the RJ45 socket (the orange cable in the centre).

      I have hardwired extension cables in my house and others so I am not a complete novice, but I cannot see any way that this is correct. I am amazed that it works at all, and I imagine that this must be the reason for the very low SNR on the line.

      Am I correct in assuming that the blue/white wires in the incoming cable are the only ones that need to be connected to the socket (via terminals A & B) ?

      If so, does the RJ45 socket also take its signal from terminals A & B, and can I therefore just disconnect the wires to the rear of the RJ45 socket?


      Any help would be appreciated....

      Cheers


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    3. #2
      JaXanim's Avatar
      JaXanim is offline Sky User Member
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      Re: Faceplate wiring and low SNR

      Quote Originally Posted by garyevs View Post
      Am I correct in assuming that the blue/white wires in the incoming cable are the only ones that need to be connected to the socket (via terminals A & B) ?
      Yes

      If so, does the RJ45 socket also take its signal from terminals A & B, and can I therefore just disconnect the wires to the rear of the RJ45 socket?
      Yes

      Jax

     

     

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