Power Line Communication Design question..

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Hi, i'm currently developing a prototype power line modem. I have a
question.

Lets say an indoor power line network. There are N number of sockets.
PC A is plugged into socket 1 and PC B is plugged into socket 2. When
PC A starts transmitting to B, how does the signal know which socket is
PC B plugged into? how does the signal know which socket to propagate
to? Or does the signal spreads out to every outlet?


Re: Power Line Communication Design question..

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I try to be polite, but you _really_ need to study a lot about signal
propagation in various wired systems and also about cable radiation
into the environment !

The signal will propagate from the transmitter all over the mains
phase wire and might be receivable (any security issues here ?) by
anybody connected to that same phase wire.

What happens, if the sockets are in the different phase (the 220/380
or 230/400 V three phase system used by most civilised countries or
the antiphase 110/220 V system used by the US) ?

Paul
    

Re: Power Line Communication Design question..
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As well as say goodbye to any ham amateur friends you used to know.
Power lines are designed to carry power, not data signals.

Rob



Re: Power Line Communication Design question..
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Personal opinion: DON'T!

The power wiring of a house resembles the very first
radio antennas by Messrs. Marconi and Popov. How on
earth would the radio frequency signal now understand
to not radiate?

The phone lines or Ethernet cables are totally
different beasts from the usual power wiring:
the cables are well twisted together with a
controlled wave impedance.

A radio frequency signal travels in the insulation
between the forward and return conductors, and
this is why the cabling matters.

Besides, there are plenty of RF hindrances in
a normal low-voltage power wiring, the 0.1 uF
capacitors across each fluorescent light as
an example. A cap of this size is a short
circuit for the RF signal.

--

Tauno Voipio
tauno voipio (at) iki fi


Re: Power Line Communication Design question..
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With all due respect: if your level of expertise doesn't allow you to
answer these questions yourself, you're obviously in *way* over your
head.  Please, drop this project _immediately_.  If you don't, you're
likely to endanger yourself or others, and you're *certain* to break
all kinds of rules about radio frequency emissions, workplace safety
and other things.

--
Hans-Bernhard Broeker ( snipped-for-privacy@physik.rwth-aachen.de)
Even if all the snow were burnt, ashes would remain.

Re: Power Line Communication Design question..
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All I can say is AMEN!

Rob



Re: Power Line Communication Design question..

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Look at Renesas. They have a line of MCUs that supports communication
over power lines:
<http://www.renesas.com/fmwk.jsp?cnt=m16c60_plc_series_landing.jsp&fp=/products/mpumcu/plc_mpumcu/m16c60_plc_series/

Regards
  Anton Erasmus


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