Acer GOM Series User Manual page 39

ACER Being Communication Inc.
Note: the limit value of SF12 is -142. Generally speaking, if signal below -124 dBm, the
packet drop rate(PDR) will be high, normal value should be during -120dBm~ -40dBm.
A. Signal Noise Ratio(SNR)
Note: The limit value of SF12 is -20db, the limit value of SF10 is -15db. The closer it's from
the limit value, the worse the signal.
The above data is based on the basis of the gateway test, if you use a node test, the data is
different.
39