On Thu, 24 Dec 2020 13:31:26 +0000, Mike wrote:

> In article ,
> Chris Green   wrote:
>>No!  That's the whole point.  The POTS phone doesn't work if the cable
>>has a break but the signal used by the internet connection is a fairly
>>high frequency and the wires act as aerials and the connection will
>>still work.  I have actually experienced this myself, the POTS phone
>>didn't work but we still had a (rather slow) internet connection.
>
> Never mind a *break*, while in the process of repairing a fault on my
> line, I was left ovenright with my actual exchange line coming to the
> top of the pole and connected to "pair A" in my overhead cable to the
> building, but my phone/router/house wiring going up the wall and
> connected to "pair B" in the overhead cable instead.
>
> This was because the job of swapping pairs had been done at the house
> end (ladder access) but needed a lift platform to complete at the pole
> (elf and safety).
>
>             Overhead
> Me: <-----o============ (nothing)
> (nothing)  ============o---> BT:
>
> Phone line -- dead. 0v. Obviously.
>
> ADSL, disconnected on BOTH wires, working at very low speed.
>
> The engineer didn't believe it possible that the modem was syncing *at
> all* "because you are not connected" ...
>
> It battled on, despite this, from the leakage/capacitive coupling
> between pairs in 30 feet of overhead cable.

ADSL is effectively radio so if the pairs are close enough then it may
indeed work (as you experienced)



--
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Hobbits!  Ponies all!  We are fond of parties.
Now let the fun begin!  Let us sing together!
  -- J. R. R. Tolkien

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