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Thread Index Re: Fw: Broadband Power Line Carrier--what is it?
Hi List
I have been following the Power line thread for a while now. Power line
distribution does not look like a good or efficient or even safe solution.
Why not DSL? or Wireless. Why do we need to put all eggs in one basket all
the time? In the current state of technology there are too many differences
between a Network built for Power delivery and one for data delivery. One
may need or cohabit with the other, but they are not the same thing. I
believe that is the reason why we have planes, helicopter, cars and boat.
All take us from point A to point to point B but the method and reasons for
choosing one over the others are very different.
Just to dwell on a practical issue, how safe would it be to troubleshoot a
Power line network when there are always lethal voltages lurking
around.....
In my opinion in the search for broadband one should not look at an Swiss
Army knife solution: One Network that does it all. There are in my opinion
much better , designed-for-the-express-purpose, alternatives right now
than power line distribution. RF wireless is one of them, DSL another....
Frantz Mathias
President
Netcom S.A.
Eje
Gustafsson To: isp-clec@isp-clec.com
<macahan@fame cc:
nt.com> Subject: Re: Fw: Broadband Power Line
Carrier--what is it?
08/07/2002
08:21 PM
Please
respond to
isp-clec
Hello george,
That is the reason why this technology been around for over 4 years
but never really taken of and not even in 230v land where they have
far less transformers to deal with then in US 115v land where you have
one for every block or so almost. :(
But yes they done some amazing improvements since 3-4 years back.
Main thing is to get the price down from multiple hundreds and
hundreds of dollars to sub hundred per unit.
g> I noticed on the units that I used last week were FCC part-15 . Also for
the
g> problems of phasing as Fred pointed out. The easy solution would be to
move
g> the circuit from one phase to the other.
g> These little buggers are rated at 14 megs and only cost less than 80.00
g> each.
g> You guys are correct though , a wide area powerline distribution system
is
g> what is needed for wide scale use. Right this stuff is just fringe use.
g> George
g> Blazing Speed ! No wires to slow us down ! Go Wireless !
g> ----- Original Message -----
g> From: "William K. Simons" <wsimons@...>
g> To: <isp-clec@isp-clec.com>
g> Sent: Wednesday, August 07, 2002 6:43 PM
g> Subject: RE: Re[2]: Fw: Broadband Power Line Carrier--what is it?
>> The problems with fluorescent lights, electrical engines and power
>> supplies have largely been solved, but the technology is new and is
>> still going through testing at this time. HomePlug members tested
>> hundreds of homes prior to the June 2001 release of Rev 1.0 and NorWeb,
>> OneLine, Enikia, DS2, MainNet, Ambient, Amperion, PowerWAN and Current
>> Technologies have all been testing and doing field trials on MV and LV
>> power transmission lines for the past few years. While transformers are
>> a hard block, most of the other problems can be handled. Delivered
>> bandwidth ranges from 1 Mbps to about 15 Mbps depending on the
>> environment, are forecasted to approach 100 Mbps in a few years.
>> Because powerlines are a shared media, security is always a concern so
>> encryption is required. Because of the architecture of the electrical
>> circuits and the 2 to 30 MHz frequencies used, coverage is typically >
>> than 95%, but they radiate right at the limit of FCC Part 15. Last
>> year, Germany's regulators decided not to allow radiation levels which
>> are needed for powerline communications and last month Japan's
>> regulators followed suit.
>>
>> Bill Simons
>>
>> -----Original Message-----
>> From: Fred Goldstein [mailto:fgoldstein@...>> Sent: Wednesday, August 07, 2002 7:17 PM
>> To: isp-clec@isp-clec.com
>> Subject: Re: Re[2]: Fw: Broadband Power Line Carrier--what is it?
>>
>>
>> At 12:54 PM 8/7/2002 -0500, Eje Gustafsson wrote:
>> >There is a big problem with using powerlines. Unless they fixed that
>> >that is.. But the signals do not transfer through transformers. Also
>> >things like fluorescent lights, electrical engines, regulated
>> >powersupplies can interfere and cause your reach to be severely
>> >decreased. I talked with a few manufacturers of power networking
>> >equipment for home use and they couldn't/wouldn't guarantee that it
>> >would work to provide service from one of a house to the other end of
>> >the house because of possible interference issues by above stated
>> >equipment.
>>
>> Good point. But we have to remember that we're talking about two
>> different things. One is when wide-area service is delivered *to* the
>> house using power line carrier. The other is in-house distribution.
>> The former has major problems, especially here in 117V land. The
>> latter, on the other hand, has its own major problems, which you noted!
>> Hmmm, two left hands...
>> ;-)
>>
>> Seriously, power line within a home may be useful, but there are plenty
>> of pitfalls. The house I grew up in, for instance, was wired for
>> 3-phase 240V service. Each 117V plug was on one phase or another, but
>> there was RF isolation between the phases. We got some Heathkit
>> "wireless" intercoms which ran on powerline carrier (~170 kHz, I think)
>> in 1960 or so, and they only worked in certain combinations of outlets.
>> The instructions suggested having an electrician put capacitors between
>> the phases of the transformer. Same old problem, over 40 years ago.
>>
>>
>>
>>
>>
>>
>>
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