On Wed, 2019-10-02 at 12:16 -0400, Bob Goodwin wrote:
> Our 120 volt service to the house is derived from a 240 volt line
> from a center tapped transformer, the center is common and grounded.
> So we have two possibilities, 180?? out of phase. Does the ethenet
> signal find it's way, maybe, maybe not but I guess I will find out.
> Some times a different wall outlet will be on the other phase, the
> other side of the transformer.
A brief search for "ethernet over power across phases" provided
conflicting answers:
---------------
Does Ethernet over power need to be on the same circuit?
If all circuit breakers are connected to the main switch then Powerline
adapters can communicate across different circuits. ... Some factors
that can impact on the performance of your Powerline network can
include wiring quality, the signal path and other electrical devices
that are being used on the same line.
Can TP-LINK powerline adapters work in different phases of three-phase circuit?
A: Yes, but its rate will be affected when crossing the phases. For
three-phase four-line circuit, we suggest you use the topology below to
get good performance.
(Their diagram shows two separate WiFi installations on both phases,
with an ethernet cable between them.)
-----------------
I dare say that two-phase has the same constraints as three-phase.
They appear to transmit over the live wire (can be used in old houses
without a ground wire). Proximity to other wiring could enable it to
cross over, but it probably does need some direct connection for a
strong signal. It strikes me that there's a call for some sort of
bridging adaptor where a device plugs into all phases and cross-
connects them with a high pass filter (for RF).
And there were other things mentioned that block signals: A UPS
between the mains and a WiFi over powerline device, surge arrestors and
mains filters.
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