Singal Levels For Clients

Michael Shuler mike at bwsys.net
Thu May 22 15:57:14 EDT 2003


When I look at a dump of the proc file for each associated station I get
something similar to the following:

STA=XX:XX:XX:XX:XX:XX
users=0
aid=10
flags=0x0003 AUTH ASSOC
capability=0x01
listen_interval=1
supported_rates=1Mbps 2Mbps 5.5Mbps 11Mbps 
jiffies=214800
last_auth=55013
last_assoc=55013
last_rx=209991
last_tx=209991
rx_packets=1736
tx_packets=2112
rx_bytes=276559
tx_bytes=1899505
buffer_count=0
last_rx: silence=11 signal=79 rate=110 flow=0
tx_rate=110
tx[1M]=0
tx[2M]=0
tx[5.5M]=0
tx[11M]=2112
rx[1M]=0
rx[2M]=9
rx[5.5M]=282
rx[11M]=1449
txexc=0

I understand what most everything in there is except for "last_rx:
silence=11 signal=79 rate=110 flow=0"
What does flow and silence mean?  What are the units of measurement....is
signal actually -79 db and silence is really the SNR...which would make the
nose floor at -90 db?  So does that mean that I have 11db of "clean" signal?
If that is true than at what speed does the radio run for X amount of
SNR...i.e. 10db = 11Mbps, 8db = 5.5, etc....any help would be appreciated.

Also using commercial APs such as Orinoco they will show you the AP's
receive signal level and the client's signal level...from what I understand
the info is in the 802.11 frames, is it possible to get a last_tx equivalent
for last_rx without having to get the value from my client radio?

Thanks
Michael Shuler




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