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The difference between the differential transmission method used for high speed signal transmission and the single end method used in conventional signal is that the single end system transmits signals with one line. The magnitude of the signal is determined by the potential difference with the ground. On the other hand, in the differential transmission method, reverse phase signals are transmitted to the two lines respectively. The magnitude of the signal is determined by the potential difference between the two lines. Here, the structure of the relay required by the differential transmission method is as follows: Two pole contact type is required for transmission with two signal lines. To see the potential difference between the two lines, it is necessary that the transmission characteristics (high frequency characteristics) on the 1 pole side and 2 pole side are equal.
