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join:2005-07-20
Hampton, VA | BPL Any 1? Personally I think BPL was doomed from the start.... | |
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DodgeRulz
Premium
join:2006-04-30
Ridgewood, NY | Re: BPL Any 1? I agree with you BPL is dead and look who wants it in? | |
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| | Vonage User
join:2004-05-15
Hillsborough, NC | Re: BPL Any 1? bring it on,
paying 45$ a month for broadband will be "dead" in the future. | |
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fyi53
@optonline.net
| Re: Symmetrical connection of up to 10 Mbps in TXU deployment Everyone will love this !!!
"Upload and download access at the same high speed, well suited
to the ongoing mass market adoption of photo and video sharing
services, interactive gaming and online storage services
-- Symmetrical connection of up to 10 Mbps in TXU deployment"
read...
»news.com.com/EarthLink%2C+GE+fun···=cd.lede | |
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dingus_b
@69.7.x.x | Oh well... At least they picked the "best in breed" when it comes to interference. The handwritting is on the wall as far as BPL being a serious long term solution for high speed data access. | |
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bamabrad
join:2006-01-27
Port Orange, FL | DEAD? Man who says it can't be done should get out of the way of the man who is gonna do it- with the strides of technology, not too many things are impossible these days. | |
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W1RFI
join:2003-05-12
Burlington, CT
| Current Technologies track record wrt interference For the record, the Current Technologies system in Cincinatti has deployed without major interference problems. Their design uses 32-48 MHz on MV lines and HomePlug modems on the 240-volt wiring. HomePlug has 25 dB notches in the Amateur bands. Although this would generally not be sufficient for overhead MV lines, it has proven to be reasonable most of the time when notched to 25 dB on the 240-volt lines.
If there is interference to Amateur Radio, it will be less severe and limited in geographical area the immediate surroungings of a premise carrying BPL. This has proven to be a manageable problem that can be practically addressed on a case-by-case basis.
See:
»www.arrl.org/news/features/2005/08/01/1/
»p1k.arro.org/~ehare/rfi/HomePlug···ARRL.pdf
Ed Hare, W1RFI
ARRL Laboratory Manager
225 Main St
Newington, CT 06111
Tel: 860-594-0318
Internet: W1RFI@arrl.org
Web: »www.arrl.org/
Member: ASC C63 EMC Committee
Chairman: Subcommittee 5, Immunity
Chairman: Ad hoc BPL Working Group
Member: IEEE P1775 BPL EMC Committee
Member: IEEE, Standards Association, Electromagnetic Compatibility Society
Member: IEEE SCC-28 RF Safety
Member: IEEE EMC Society Standards Development Committee
Chairman, BPL Study Project
Member: Society of Automotive Engineers EMC/EMR Committee | |
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Middieman
Eschew Obfuscation
join:2001-02-05
Elkins Park, PA
| Re: Current Technologies track record wrt interference quote:
Their design uses 32-48 MHz on MV lines and HomePlug modems on the 240-volt wiring. HomePlug has 25 dB notches in the Amateur bands.
What frequencies need to be notched out of HomePlug modems? If ham frequencies need to be notched out of HomePlug modems, I'd bet that someone with one of these does NOT want to live next to me.
(The link to the homeplug PDF didn't work when I clicked on it. Regarding 32-48mhz, as you know, it's not in the amateur bands, so I don't see that as a problem for hams either.)
-=[Middie]=-
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All your base are belong to DSL Reports! | |
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| | W1RFI
join:2003-05-12
Burlington, CT
| Re: Current Technologies track record wrt interference My apologies for the typo:
For the HomePlug link:
»p1k.arrl.org/~ehare/rfi/HomePlug···ARRL.pdf
HomePlug is an industry specification originally designed by an industry consortium for in-premise BPL modems. It uses OFDM (multiple carriers) between 4 and 21 MHz. Carriers in or immediately adjacent to the following spectrum have been turned off to protect sensitive reception in the licensed Amateur Radio Service:
7-7.3 MHz
10.1-10.15 MHz
14.0-14.35 MHz
18.068-18.168 MHz
At the time, the several available channels in the 5.2 MHz region did not exist for Amateur Radio.
Ed | |
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Middieman
Eschew Obfuscation
join:2001-02-05
Elkins Park, PA
| Re: Current Technologies track record wrt interference Pretty interesting stuff there on Homeplug, W1RFI.
It uses the low bands, which to me is a poorly conceived idea.
And it seems that it might be detectable from a ham next door to someone with a Homeplug system if the Ham's antenna is less than 60 feet away. That could be a problem for some people. (It does not happen to affect me because I'm much further than 60 feet from other people's houses.)
However, it'd be a good idea for the ARRL to test how a ham's transmissions affect the Homeplug system. Since the device must accept interference from sources that have licensed priority (hams) then the Homeplug people might be interested in knowing that their system might be better away from ham frequencies all together... to avoid Homeplug being blown the hell out of the water by 1500 watts on the low bands.
-=[Middie]=-
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All your base are belong to DSL Reports! | |
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Middieman
Eschew Obfuscation
join:2001-02-05
Elkins Park, PA
| Re: Current Technologies track record wrt interference I read the PDF of the interference study specific to the Homeplug in house module. That's just as interesting, isn't it.
It seems that a ham in front of someone's house in his/her car can completely knock out a Homeplug system with only 4 watts. (No one uses only 4 watts in a car on HF.)
Then I see later in the results section (but not how the estimate was arrived at) that BPL could be knocked off the air if their living at least within a HALF MILE of a ham radio operator. It sounds like a guess to me, based upon most hams using at least 100 watts on the low bands.
I think that the half mile radius can at least double to a mile when the power is cranked up to just 400 watts or so--a very realistic operating power for hams.
That should be disturbing to the people who make the Homeplug system.
-=[Middie]=-
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All your base are belong to DSL Reports! | |
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| | | | | | W1RFI
join:2003-05-12
Burlington, CT
| Re: Current Technologies track record wrt interference I can add that in Cincinatti, I did a quick test with 75 watts under the same circumstances and saw no effect on the BPL system. Clearly, something was different, but we don't know what from that fast test.
I have offered repeatedly to Current and other BPL manufacturers to help with some better controlled testing, but so far, no takes. Some utilities seem more interested, but the only additional testing done was the work done in Cottonwood, AZ.
Ed | |
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RadioDoc
Sortofadog
Premium,ExMod 2000-03
join:2000-05-11
Chicago, IL | This just proves... ...Earthlink has more money than brains.
It's probably time to take the money they get from me elsewhere...
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Toolmaster of La Grange. | |
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TK Junk Mail
Go ahead, make my day
Premium
join:2002-03-03
Margate City, NJ
clubs:
 ·Comcast
| Re: Hey, whatever works! said by wifi4milez  :If Earthlink can get this technology (officially) off the ground then I say "congrats". They (EL) are trying very hard to stay relevant, unlike 99% of the other CLEC's who are still complaining about the loss of UNE-P and I commend them for it. Whether they can make money while pursuing all these other technologies still remains to be seen however! Yes, Earthlink is trying like crazy, and kudos to them for the attempt. I just don't see them remaining profitable over the long run. They are spending all their time trying to get into areas no one else is really interested in. And it makes you wonder why that is the case. Probably because profits will be really slim or non-existent. Their stockholders should bail now or hope that some buyout lets them make a small profit before Earthlink folds.
--
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Join Red Room Forum
BLOG tkjunkmail.blogspot.com
My Web Page | |
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BPLSUCKS
join:2006-04-26
Grand Ledge, MI | BPL This is a last-mile solution. At least in our town its symetrical connectsions at 512k 1.5meg and 3.0 meg. But then again we have a BPL/wireless hybrid. | |
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| W1RFI
join:2003-05-12
Burlington, CT
| Re: BPL A report on its performance would be appreciated by all, I am sure. What kind of speed does it get in practice? How does that change during peak times? What percentage of the time is it up? What city? The hybrid sounds like an Amperion system. PPL is in the process of taking them out of most areas of their Allentown, PA system.
Contact me directly, if you prefer: w1rfi@arrl.org
Ed Hare | |
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Earthlink Invests More in BPL
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