... multiframe structure: 复帧结构 multifrequency dialing: 多频率拨号 multifrequency signaling: 多频率信令 ...
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MFD multifrequency dialing 多频拨号
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Signaling took the form of a series of multifrequency (MF) tones, much like touch tone dialing between switches.
信号将一系列的方式多频(MF)音调，很像之间互动音频拨号开关。
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