| 摘要 |
PURPOSE:To eliminate a wave interferring an incoming signal by using a frequency band of an idle channel in an outgoing transmission band, converting the incoming signal to a frequency of a trunk line system and connecting the signal to the trunk line system. CONSTITUTION:The incoming signal of a frequency band of n-channel being an idle channel of the frequency band of the outgoing signal is transmitted to a distribution tap (i) from a subscriber (j), the incoming signal enters a frequency converter (c) via a directional coupler (g), an incoming branch amplifier (h) and a band pass filter (e), the incoming signal is converted into the frequency band of the existing incoming signal in 10MHz-50MHz by the frequency converter (c) and then inputted to an incoming trunk line amplifier (l).
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