Paul

I have checked all the cables with an RJ45 cable tester They are all straight 
through no shorts all are 1 - 1, 2 - 2 etc.

I have tested all the sensors on short 1 meter cables and thrown out the ones 
which are faulty.  It does not matter what I plug in
the devices disappear. as I say even a cable with nothing on it which is 
straight through all devices disappear.

The other thing I have noticed is when this happens the light on the linkUSB 
stays on very dim even with an open ended cable.

Colin

This sounds like a hardware problem. My first suspicion is the cable --
could it be shorted or the polartity reversed?

On 24/01/14 12:01, Colin Tinker wrote:
> Hi
>
> I feel like I am banging my head against a wall with the problem I
> have.  3 weeks ago we had a lightning strike on the telephone cables in
> our village it too out a lot of kit for all of our village.  I lost my
> 1-wire USB adapter, a couple of temperature sensors, a dual counter, 2
> power supplies and my 2 homeplug adapters as well as my BT home hub and
> the BT face plate.
>
> My problem now is if I plug a cable longer than 2 meters into my new
> RPI2 interface via the temperature sensor in the lounge even with
> nothing on the other end, every device on the network disappears!!!!
>
> I have tried a LinkUSB interface with the same result, I have chnaged
> the Raspberry pi for a different one re installed the Rasbian image and
> owfs and the result is still the same.  All the cables have been swapped
> for ones not used during the strike although they all tested fine.  All
> the devices have been tested on short 1 meter cables all linked together
> and it all works fine.
>
> I have temperature sensors in every room with a weather station
> outside.  What should be there can be seen at http://www.g1gsw.org/ it
> will be slow as I awaiting for BT to resolve a slow connection.
>
> Help.
>
> Thanks
>
> Colin

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