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- 由电端机经电缆输送给光端机输入电路的PCM电信号的码型,称为输入接口码型,单极性不归零码,CMI码,HDB3码等-By electric end machine through a cable to optical transceiver type of PCM signal input circuit, known as the input interface type, single polarity is not zero yards, CMI code, HDB3 code, etc