... 通道命令：channel command 通道忙音：channel busy tone 通道类型：channel type ...
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... two-channel 双声道的; 双通道的; 双信道的 channel busy tone 信道忙音 tch tone channel 信号音信道 ...
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The operation of Dual Busy Tone Multiple Access(DBTMA) is based on the RTS/CTS packet and two narrow bandwidth, outofband busy tones. The RTS/CTS dialogue is used to reserve the channel.
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。
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