| In this paper according to the transmission line, shielded theory .two-port network . signal processing theories and filtering theories, the anti-inference technology of information device connecting system has been studied. The crosstalk between lines and the method of filtering connectors have been systematically analyzed. Firstly the fundamental theories arc presented and two transmission line model based on these theories is established. Then the signal integrity of transmission lines has been put forward . The method of time-domain crosstalk is introduced. And the crosstalk on the receiving line in different condition is emulated. And the emulated results are compared with the testing result. The special clamp of filtering pin is designed. And the insertion loss of filtering connector and the variation of signal waveform through it are put forward. Based on the theories above, the software of the crosstalk among cables is programmed and its application is introduced.
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