Slashdot Mirror
Electric Company Using Power Lines for Data
Snags writes: "The local electric company PPL Utilities is testing a system to send electricity usage readings back to the company over its own power lines. According to a local newspaper article, they are using the TWACS system made by DSCI. I'm just hoping this doesn't interfere with other ideas for sending data over power lines."
Boy, I can't wait for the first time I can take a tcpdump of my electrical wiring in to dispute my bill...
:)
And how about a DDOS attack? Do I have to firewall off my toaster now?
this idea has the potential (get it?) to make a short in your network card a little more hazardous. This is a BOFH moment waiting to happen.
One CPU cycle wasted on digital restrictions management is ONE TOO MANY.
A proposal to use power lines in the UK for data transmission was dropped because of a number of difficulties, most notably the fact that HF radio (about 2MHz to 30MHz) would have been rendered unusable in urban areas. Street lamps made great quarter-wave antennas.
In ohio, they are doing this in several place,
In a small town (where I work) they have pretty progrewssive ideas on power and communications,
First they have community power, almost 1/2 the cost of Ohio Edison in the next town over. Second is community cable, once again much cheaper, third is cable internet access, $20 a month compared to Time Warners, which you can still get here,
NOW about a year ago Wadsworth put FIBER to every home in wadsworth, long term plans include long distance. AND the ability to selcetivly shut down electical stuff on peak demand, (just your air conditioner, etc) to avoid brownout, because of the above reasons , and one of the best public school systems in the country, population is exploding.
Wadsworth is a great town and I lived there during my high school years, BUT If i lived here again an axe and cutters would hit that fiber so fast it'd make your head spin. Shutting down services on your panel selectivly MY ASS.
Sig went tro...aahemmm.....fishing........
HydroQuebec, in the provinde of Quebec (duh!) tried this a few years ago (circa '97).
At the time, there were a number of obstacles that made this technology unworkable. If I remember correctly it had something to do with electromagnetic field sensitivity. The earth's EM and solar flares made the whole system too error prone, at the time.
This brings up another memory. A company, 10 years ago, had a cheap office wiring system that used the ground outlet as a network transport. With their adapter, any machine plugged (quite literally) was on the same network.
What made that idea (and company, I think) fold was the lack of security. Anyone could connect to your house's power outlet and get connected. Furthermore, there were no filtering devices that served as "firewall" between your house and the external power grid.
TWACS currently reads at 300bps. There's technology out there that will up that, but it isn't going to get anywhere near what's needed for a decent Internet connection anytime soon.
My husband has been working with DCSI for about 2 years on the system in NE WI and there have been a few issues with interference, but not with homes and shit. The pulses aren't strong enough to interfere with normal shit, though there was one incident of a substation - which sends time synch pulses out to individual meters - setting off the railroad crossing alarms every 15 minutes.
It's a better solution than using RF to transmit the readings back to the sub - most of those are using 900MHz to transmi and you can imagine what kind of problems THAT causes.
I don't have a solution, but I certainly admire the problem.
Our competitor got their hands slapped pretty bad by the public utility commission for that one and had to eat the entire investment. There was just no justification for such fancy toys to handle such a low-tech task.
sPh
We canned the idea for Internet, but this application sounds ideal; low bandwidth, low contention (presumably), and if it goes wrong, you can always send the legacy meter readers around in a van... Or you could upgrade all your kit, I wonder which one they'll opt for...
UNIX? They're not even circumcised! Savages!
There's very little in common. TWACS works by doing phase-shift modulation on the 60Hz carrier; this is a wonderfully robust method when implemented correctly, but at best you get a bandwidth of a few tens of bits per second. This is great for reading power meters (where a few bits per hour is plenty of bandwidth) but it has nothing to do with high-speed internet connections.
I was outside the house the other day and noticed that my electric coop had installed a new meter. Upon closer inspection I noticed a little red light on the meter. Curiousity was peaked so I called up a friend of my that works for the coop and he went into a long explaination about these new meters they are rolling out. He called them Turtle meters and a quick net search turned up http://www.turtletech.com/Products-Sales/standardt urtle.htm
To quote their website
It monitors kilowatt-hours and records peak and minimum demand. The data is time-stamped and is continuously transmitted across the utility's own power lines. As long as the meter has power, the Turtle transmitter can provide a count of short outages (blinks) and establish whether the transmitter is in power fail.
The Standard Turtle transmitter can be programmed to return one of eight different data transmission options. The time needed to transmit a complete packet varies from 13.9 to 27.2 hours depending on the amount of data being transmitted.
Which falls in line with my friend telling me that it can take a day to get a reading because they are using a super low frequency. So yeah, they can remotely read meters. But they have definite problems with lightning. My friend spends a lot of his time in the summer replacing the Turtle units in the meters because they fry very easily he says. But they are cheap enough that it is still cheaper than sending a meter reader to all the houses.
Hunt says they've been doing this since 1995, so its not new, but few people have seen it because it has taken a while to get them out.