On 23/12/2020 23:17, Chris Green wrote:
> Deloptes  wrote:
>> Chris Green wrote:
>>
>>> Yes, but since the last mile or two is still copper the explanation I
>>> gave for how you can have no telephone service but have an internet
>>> connection still stands.  A break in the 'last mile or so' of copper
>>> will produce those symptoms.
>>
>> why - this is only one cable that carries both signals - the fact internet
>> works, means the cable is OK. Why the other does not work, is to be
>> identified by the operator.
>
> 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.
>
Exactly true. Had the same here. POTS uses baseband 100Hz-8KHz
ADSL runs from about 50KHz to around 5MHz.
If you get a line break you lose the lower bins up to about 1Mhz but
above that stray coupling still allows some signal to get through
depending on exactly how the break happens

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