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'[TECH] Data over Power Lines (AC)'
2012\03\13@171841 by Josh Koffman

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Hi All.

I've been asked to help with a bit of background research for an idea
a friend of mine had. He wants to do some data over powerline
transmissions. This isn't long distance (it would be within the same
building). A few years ago I would have said that it wasn't going to
be that possible, but with the number of broadband over powerline
devices and the plethora of home networking extenders that use power
lines, maybe things have changed?

I've been doing some searching around, but as with most things network
related, I'm not finding a ton of really useful info out there. Then
again, maybe I'm just missing it. His specs aren't too demanding.
Speed is somewhere between 100-300kpbs. Might be able to tolerate
lower.  Bi-directionality is a plus. Low cost is also a consideration,
so if there are expensive transformers or the like involved, that
might not be too good.

I'm going to keep searching, but if anyone has any pointers, even just
to manufacturers that do this kind of stuff, I'd appreciate it!

Thanks,

Josh
-- A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
        -Douglas Adams

2012\03\13@175951 by Chris McSweeny

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On Tue, Mar 13, 2012 at 9:18 PM, Josh Koffman <spam_OUTjoshybearTakeThisOuTspamgmail.com> wrote:
> Hi All.
>
> I've been asked to help with a bit of background research for an idea
> a friend of mine had. He wants to do some data over powerline
> transmissions. This isn't long distance (it would be within the same
> building). A few years ago I would have said that it wasn't going to
> be that possible, but with the number of broadband over powerline
> devices and the plethora of home networking extenders that use power
> lines, maybe things have changed?

HomePlug. Technology is mature and readily available off the shelf -
was already available a few years ago (I remember first discussing
stuff like this well over 10 years ago).

Personally I have fundamental objections to the use of this kit, due
to the RF interference it causes in the HF band, but if you're keeping
it within a single building at low power and don't have any radio
amateur neighbours it's probably not that big a deal.

Chri

2012\03\13@193737 by Matt Bennett

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On Tue, March 13, 2012 4:18 pm, Josh Koffman wrote:
{Quote hidden}

Microchip has a development board that uses powerline communications:
<www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en553054>
It runs on a dsPIC33. There are other powerline solutions that don't use a
general purpose chip, but the dsPIC solution is the only one I've worked
with.

Powerline communications is challenging- particularly if you are trying to
stay in one of the "approved" bands (below 130KHz, for example).  By
design, AC power is very low impedance- in the milli-ohms, typically up to
at least 1 MHz. Add to that all the other noise on the line- getting
reliable communications is not trivial.

Don't forget the "not kill yourself" part. When you're playing with mains,
the risk is *REAL*.

Matt Bennett
Just outside of Austin, TX
30.51,-97.91

The views I express are my own, not that of my employer, a large
multinational corporation that you are familiar with

2012\03\14@140233 by Electron

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At 00.37 2012.03.14, you wrote:
{Quote hidden}

And it costs energy. As far as I know it's not a cheap way to transmit data,
well at least my powerline-based LAN endpoints get very hot, of course things
are less demanding when turning on or off seldomly lights and home appliances.


>Don't forget the "not kill yourself" part. When you're playing with mains,
>the risk is *REAL*.
>
>Matt Bennett
>Just outside of Austin, TX
>30.51,-97.91
>
>The views I express are my own, not that of my employer, a large
>multinational corporation that you are familiar with.
>

2012\03\14@142425 by A. Sergio Sena
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Take a look at YTRAN (Israel) products, speed is slower than that, but
they work ok.

Regards,
Sergio Sena







On 14 March 2012 18:02, Electron <.....electron2k4KILLspamspam@spam@infinito.it> wrote:
{Quote hidden}

>>

2012\03\14@145710 by Luis Moreira

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Hi Guys,
Been using a couple of TP-Link 85Mbps Powerline adaptors for about a year
with no problems at all, in fact I just bought some 200Mbps ones for me as
I have given the 85Mbps to a friend. But I do have a problem which you Guys
may be able to help me with.
When you connect the powerline adaptor, for optimal operation you really
need to connect sort of directly into the wall socket and not through an
extension lead, my problem is that like that you automatically lose two
sockets. I got a triple socket adaptor that works well for the powerline
adaptor as it is strait out of the wall socket and allows for it to be
mounted vertically for optimum cooling, but I would prefer not to use them.
What I would like to do is to get an extension lead with a UK mains plug
that would also have a socket in it, something similar to a strait through
power meter that you can get. This would allow me to use the socket for my
extension lead and also for connection of the powerline adaptor.
Has any of you ever seen something like that?
Thanks
Best Regards
                   Luis

On 14 March 2012 18:24, A. Sergio Sena <a.s.senaspamKILLspamgmail.com> wrote:

{Quote hidden}

> >>--

2012\03\14@173348 by Brendan Gillatt

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On 14 March 2012 18:57, Luis Moreira <EraseMEluis.moreira1575spam_OUTspamTakeThisOuTgooglemail.com> wrote:
> What I would like to do is to get an extension lead with a UK mains plug
> that would also have a socket in it, something similar to a strait through
> power meter that you can get. This would allow me to use the socket for my
> extension lead and also for connection of the powerline adaptor.
> Has any of you ever seen something like that?

Have you tried using an adaptor 'brick' like
'http://ecx.images-amazon.com/images/I/41tiiXvgiGL._SL500_AA300_.jpg'
combined with a regular extension lead?

-- Brendan Gillatt
http://www.brendangillatt.co.u

2012\03\14@182547 by Luis Moreira

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Hi Brendan,
That's what I have at the moment, but I really don't need the two other
sockets and also is difficult to control quality... I just had a look at
some plug and socket for a friend of mine last weekend and you should see
the state of it, it was lucky it didn't cause a fire. Looking at it looks
like bad contact between the cheap socket and the plug, that just making me
think...

Best Regards
                 Luis
On Mar 14, 2012 9:36 PM, "Brendan Gillatt" <brendanspamspam_OUTbrendangillatt.co.uk>
wrote:

{Quote hidden}

>

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