[Tfug] Yet another poser

[Bexley Hall]

--- jblais <joe.blais at pti-instruments.com> wrote:

> > This is really old technology.  For years, analog
> telephony has been
> > multiplexing power as well as analog audio on the
> same two pairs.
> >
> > It gets even worse.  Normally, telephony puts
> about 48 volts DC on the
> > pair to power the phone, something like 40 ma
> maximum.  However, when
> > someone calls you, they superimpose a 20 Hz 90-105
> volt A/C signal on
> > the same pair to ring the bell.
> 
> I guess this is how X-10 stuff works -
> I also remember an old house where we lived, where
> only one phone wire came
> into the house, the circuit was closed through
> ground, and from the
> grounding block there were 2 wires through the
> house.

Hmmm... that doesn't sound right.  Usually you end up
with *unbearable* hum if one side of the telco line
is grounded.  <shrug>


       
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