Why Wi-Spy's RSSI is much lower the the Wireless Card's software indicator's????

Submitted by anders on Wed, 08/13/2008 - 20:45.

the porblem still with me:(
this is show in the Insider 3.1 reports window:
Channel Grade Duty Cycle Average Floor (dBm) Average Peak (dBm)
1 99 (A) 0.6 -115.6 -94.1
2 99 (A) 0.6 -115.7 -92
3 99 (A) 0.6 -115.7 -93.3
4 99 (A) 0.4 -115.8 -98.3
5 100 (A) 0.1 -115.9 -105.4
6 100 (A) 0 -116 -109.8
7 100 (A) 0 -116 -110.2
8 100 (A) 0 -116 -110
9 100 (A) 0 -116 -110.1
10 100 (A) 0 -116 -110
11 100 (A) 0 -116 -109.9
12 100 (A) 0 -116 -110.2
13 100 (A) 0 -116 -110

Here is the byte[] Retrive from the USB WI-SPY Device:
256points>,27,23,27,22,26,25,28,27,24,...

And the cisco WIFI Card show the RSSI Is -35dbm or so(why the WI-SPY is peak Value is much lower the the CISCO 's RSSI val???)
My Questions :
what is the RelationShip of the data Get From WI-SPY USB devcie
and the Cisco WIFI Wireless Card(the -35 dbm)?
Please Help@!!!!!!!!!!!!!!!!
Thanks a lot!

Edited by brian

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»
Submitted by brian on Thu, 08/14/2008 - 10:43.

The short answer is that Wi-Spy is measuring the current signal level, and the AP is reporting its maximum possible signal level.  Since APs don't blast away at their highest transmit level constantly, the likelihood of Wi-Spy catching the device at its peak transmit level is small.  If you are in the middle of a large file transfer on the AP, you will probably see a closer correlation between the Wi-Spy RSSI and the AP's reported signal strength.

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