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I thought Motorola amended those interference
claims long ago (or should have). Why?
1. Canopy nominal C/I performance (2 to 3 dB)
is only achieved at very strong signal. Anywhere any distance (meaning
signal not that far above sensitivity) Canopy's C/I isn't much different than
any competitors equipment. This was discovered shortly after Canopy first
shipped, so any manufacturer provided presentations should clearly have been
updated by now.
2. Canopy nominal C/I performance (2 to 3 dB)
is only for the slow speed (10mbps). Canopy's higher speed requires much
more C/I margin. When you list competitors requiring C/I of 8 to 25 dB the
higher figure (25dB) applies to competitors that signal at higher speeds, so the
speed note is worthy. Again, the higher speed Canopy option has been
supported for several years, so the presentations should certainly have been
updated.
As far as what the claims mean, that's easy.
C/I expresses how much signal advantage the device needs above surrounding
signals (meaning competitors). The device with a higher C/I needs more
signal advantage relative to competitors than the device with the lower
C/I. If you've got signals in the air (use your spectrum analyzer mode to
see if you're curious) then you definitely want a device with a low C/I.
Problem is, Canopy's low C/I claim is known to be less advantage than
what you cited as having picked up from that presentation.
Rich
----- Original Message -----
From: Mario
Pommier
Sent: Thursday, December 01, 2005 9:52 AM
Subject: [WISPA] canopy interference Saw them in a Canopy presentation: Canopy was optimized
to ignore external interference.
Every radio is
factory tested to meet throughput at 3db C/I (channel interference?)
Canopy nominal C/I
performance is ~2 dB.
Competitions C/I
requirements are 8db 25
db. Thanks. Mario
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