Patent ID: 8923904

Claim:
A system for determining a right to speak, comprising: more than one Secondary Protective Devices (SPDs), each of the more than one SPDs configured to: separately select a respective Request to Send (RTS) sequence from a preconfigured RTS sequence set, separately and simultaneously, send the respective selected RTS sequence to a Primary Protective Device (PPD), wherein each respective selected RTS sequence sent by each of the more than one SPDs is unique and different from each other; separately receive one chosen RTS sequence sent by the PPD, wherein the one chosen RTS sequence is chosen by the PPD from among the received respective selected RTS sequences simultaneously sent from the more than one SPDs; separately determine whether the right to speak is obtained, wherein: the right to speak is subsequently obtained by a particular one SPD from among the more than one SPDs, if the particular one SPD determines that the one chosen RTS sequence received from the PPD is identical to the respective selected RTS sequence sent to the PPD by the particular one SPD, the right to speak is not subsequently obtained, if the particular one SPD determines that the one chosen RTS sequence received from the PPD not identical to the respective selected RTS sequence sent to the PPD by the particular one SPD.