Powerline modem

Powerline modem
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Subject Author Date
Powerline modem Gireesh 02-07-2005
| |--> Re: Powerline modem phil-news-nospam02-09-2005
Posted by Joerg on February 9, 2005, 7:58 pm
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Hello Peter,

>With very low channel width and appropriate signalling you do not need
>to bridge transformers. However if complex tariffs are envisaged
>there may be a need for transmitting up to 24 readings a day per meter
>and this may be beyond such systems.
>
>

In Germany they send around control signals to turn on "night storage
heaters". Basically a huge block of bricks that is heated up off-peak
and then a fan kicks out the stored heat during the day. Usually there
are several such units per residence. The control of these via the power
grid is very reliable. I believe they can selectively turn on groups of
them but there were some restrictions as to which areas could receive
the control signals to within the prescribed specs.

Anyone who wants to check that out and can read German could search
Google for the terms "Nachtspeicherheizung" and "Rundsteuerung".

Meter reading could be done staggered. That way the amount of data can
be spread out over each month. Pretty much in the same way that the
meter reader travels their monthly route.

But there is one obstacle to all this. I heard from someone in the power
biz that occasionally it was said "so-and-so does not like these
research projects if they lead to the elimination of jobs".

Regards, Joerg

http://www.analogconsultants.com


Pure Networks
Posted by James Knott on February 9, 2005, 3:34 pm
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Joerg wrote:

> In Germany they send around control signals to turn on "night storage
> heaters". Basically a huge block of bricks that is heated up off-peak
> and then a fan kicks out the stored heat during the day.

When I was a kid, we had a flat rate electric water heater. It could be
turned off by the power company, during periods of high demand, using a
power line carrier system. The power companies also used the power lines
to carry low speed data. However, neither of those systems required
anywhere near the bandwidth of BPL, nor were they likely to cause
interference.



Posted by Gary on February 11, 2005, 9:01 pm
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> Hi all,
> I'm engaged in designing a powerline modem. and i'm in search of a
> perfect IC for that.
> I found HCPL800J DAA with DSP56F801 PLM ?
> Is there any one who worked on this ?
> Can abnybody suggest me better ICs ?
> I need a range of atleat 1 km and the application is Automatic meter
> reading

If you haven't already discovered it, there is a lot of helpful information
on the Freescale Semiconductor web page for the DSP568xx family. There are
a couple of brochures on power line modems and power meters implemented with
the DSP568xx family. This link is a good place to start:
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=DSP56F803

You may also want to contact your local Freescale representative, as they
can point you to more detailed information the implementation of power line
modems on the DSP568xx family.

-Gary




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