[Tinyos] choosing carrier sense threshold in Mica2

[Alejandro Santos Martínez Sala]

Hi!

I can see in RadioControlM.nc for mica2dot that carrier sense threshold is
set
to 0xb5.  I would like to know how  it is mapped to dBm. In MPR/MIB Mote
User
Manual it is said that conversion is as follows:
Vrssi = Vbat*ADC_counts/1024
RSSI(dBm) = -51.3Vrssi-49.2 @ 433MHz
RSSI(dBm) = -50.0Vrssi-45.5 @ 915MHz

According to that, carrier sense threshold is set around -70 to -76 dBm. Is
that correct?

Why has been choosen this value? Is there any particular reason?
We want to study interference in WSN and this is an important parameter to
obtain any conclusion.

Thanks a lot.
Best regards from Spain

                    Alejandro