RE: Emulating a wireless access point
From: bparis@sorrentolactalis.comDate: 08/15/01
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Message-ID: <4ECB59BEECC4D41187E80000E897FABE3BE0FD@BNT06> From: bparis@sorrentolactalis.com To: pen-test@securityfocus.com Subject: RE: Emulating a wireless access point Date: Wed, 15 Aug 2001 12:42:41 -0400
You are correct Meredith.
I live near a cell tower (100m away) and can clearly hear cell
conversations on my scanner at the 1st lower harmonic, app 450-460Mhz.
Getting back the the original question, cordless 2.4Ghz phones are
notorious for creating interference with other devices using the same freq
band. I recommend not operating 2.4Ghz phones in a wireless environment.
William S. Paris
Telecommunication/Network Analyst
Sorrento Lactalis Inc.
bparis@sorrentolactalis.com
Actually, it probably has to do w/ the frequency / harmonic
resonance of
the phone interfearing w/the AP ... not the proximity. Even if the phone
operates on a different frequency, it can interfere w/ the AP via harmonic
resonance.
Harmonic Resonance occurs when one of the frequencies is a multiple
of the
other. Say your AP operates at 2 hz ( for simplicity sake) and your phone
operates at 4 hz, then every other cycle of the phones frequency will be in
phase w/ the access points.
ASCII Diagra:
| x -- sine peak As you can see, the sine
waves are prefectly
| | | | | Phone in-phase at 2 and 4 w/
respect to the phone.
| | | | | | | | |
| | | | |
|_________________________________ T = 1 sec
|
| x -- sine peak
| | |
| ....| |.....| |. Access Point
| | |
| |
__________________________________ T = 1 sec
Are there any Ham operators out there that can confirm or deny this?
-- Meredith Shaebanyan
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- Previous message: Artes, Francisco: "RE: Emulating a wireless access point"
- Maybe in reply to: Steve Skoronski: "Emulating a wireless access point"
- Next in thread: David Ford: "Re: Emulating a wireless access point"
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