Patent ID: 6993292

Claim:
A method of identifying nonfunctional two-way radios from among a known group of two-way radios expected to be operating within a region, the method comprising: for each of the two-way radios expected to be operating within the region, assigning a first frequency upon which all of the two-way radios are to receive transmissions; assigning a second frequency upon which all of the two-way radios are to broadcast transmissions; assigning a unique identification code to each of the two-way radios; establishing a window of time that corresponds to each of the two-way radios; for each of the established windows of time, awaiting a transmission from the corresponding radio; if, for a particular radio, no transmission is detected within its corresponding window of time, recording the absence of the transmission; and if, for a particular radio, the number of times absence of transmission has been recorded exceeds a threshold, identifying the particular radio as nonfunctional.