hwRadioPERThreshold 1.3.6.1.4.1.2011.6.139.3.1.1.8

A threshold standard, which uses the units percent ,gives an utmost rate to the lost signal packet or the error signal packet. The range of the threshold is from 3 to 50 percent, and the default PER threshold is 30 percent. If the average percent is out of the threshold, the Radio's channel or power level would be changed. when the MAC layer of the radio sends a signal packet at the least speed, and retransmits it the largest times, still could not receive any ACK or NACK packet, it will be thought as signal packet lost or error.