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calvoiper
join:2003-03-31
Belvedere Tiburon, CA
| reply to Transmaster
Re: True
said by Transmaster  :... and they are still fantasising the it will be the rural provider.
Yeah, and the really annoying thing is that they end up with "demo" projects that all use BPL for "last mile" connections in urban areas, while people don't realize that trying to use it over long distances in rural areas is a wholly different application.
Why is rural different? Well, when you are cramming a broadband signal down a wire designed for something other than broadband, there are significant losses with increasing distance. (Hint: consider DSL.) Additionally, there are transformers to consider, and the wire cable is even less suited to high-frequency transmission than twisted pair copper. (Yes, I know you thought that wasn't possible, but it is.)
Anybody got any results from any "long-haul" trials of BPL?
calvoiper
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VoIP--the death knell of remaining voice monopolies! | |
W1RFI
join:2003-05-12
Burlington, CT
| > Anybody got any results from any "long-haul" trials of
> BPL?
In central VA, IBEC (a BPL manufacturer) and the local rural cooperative are running a commercial BPL deployment. They have reported that they are sending a BPL signal down 13 miles of overhead lines, using repeaters, of course. The repeaters are purportedly as much as a mile apart, but a deployment map that shows the locations of the units shows the typical 1000 feet or so as the spacing for most of them. I have no specific data on any testing, although having talked with a couple of users there, they have been generally satisfied with the performance. One user complained about reliability.
With rural lines, they can generally go farther along the line than they can do in urban environs. There are far fewer transformers, taps and other lossy configurations, if they can clean up all the power-line noise.
Ed Hare, W1RFI | |
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