Interesting People mailing list archives
more on FCC adopts rules for broadband over power lines
From: David Farber <dave () farber net>
Date: Sat, 16 Oct 2004 19:29:48 +0100
Begin forwarded message: From: Brett Glass <brett () lariat org> Date: October 16, 2004 5:06:00 PM GMT+01:00 To: Jim Thompson <jim () netgate com>, dave () farber net Cc: Ip <ip () v2 listbox com>, gerry-faulhaber () mchsi comSubject: Re: [IP] more on FCC adopts rules for broadband over power lines
At 02:28 AM 10/16/2004, Jim Thompson wrote:
I heard Mr. Glass speak once at a "open spectrum" conference at Stanford. He winged about not having sqaters rights in the ISM band,
Not true. I didn't "whinge" (please spell it correctly) about anything; rather, I called attention to a real problem. And proposed solutions which would avoid unnecessary interference.
and he complained about interference to his network right after admitting to operating with large (12-15dBi) omnis attached to his gear.
Omnidirectional antennas (Ours, incidentally, are about 8 dBi) allow the most spectrally efficient deployments. Multiple directional antennas and transmitters require the use of more spectrum and therefore increase interference. In bands where spectrum is scarce and there are few non-overlapping channels (e.g. 2.4 GHz), points of presence that use multiple non-overlapping channels preclude frequency coordination among users of the band. (Interestingly, the proof of this is a practical application of the "four color mapping theorem.")
He's getting exactly what he designed for. Massive interference.
I'm doing better in the presence of interference than any other WISP in comparable circumstances. However, I cannot provide anywhere near the reliability of a wired connection. And, yes -- one ordinary cordless phone in the wrong place could shut down any of my customers. --Brett Glass ------------------------------------- You are subscribed as interesting-people () lists elistx com To manage your subscription, go to http://v2.listbox.com/member/?listname=ip Archives at: http://www.interesting-people.org/archives/interesting-people/
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