The operation of Dual Busy Tone Multiple Access(DBTMA) is based on the RTS/CTS packet and two narrow bandwidth,outofband busy tones.

• 双忙音多址接入(DBTMA)协议是采用RTS/CTS对话机制来预约信道,通过引入两个窄带带外忙音信号来避免分组间冲突,解决了隐藏终端和暴露终端问题。