frequency exchange signaling
... frequency drift 频率漂移 frequency exchange signaling 频率交换信号传输 frequency frogging 频率互换 ...
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We study the transmission of signaling signal with the compelled method of multi-frequency, and study the switching control of DTMF signaling with exchange in wireless in details.
详细论述多频互控方式的信令信号传送，交换机DTMF信令无线信道接续与控制。
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