Hi,

When I do iwlist scan using my BCM 4318 cards, the reported noise
level is very high, around -57 dBm.  I don't expect the card to
measure the background noise accurately.  But this value looks
unreasonable and it is higher than the signal strength of most of the
data packets.  I noticed that in the driver code,
b43_rssi_postprocess(...) is called for signal strength, but not for
noise level.  Are they both using dBm?  How to interpret the noise
level?

PS, I also tried another card in the same room, whose reported noise
level is around -70 dBm.

Thanks,
-Bo
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