Analysis of Crosstalk of Communication Cable in Metro Network Control System

Aiming at the crosstalk problem of metro network control communication cable, a crosstalk model based on the theory of MTL is established, and a calculation method for distribution parameters of shielded cables in a homogeneous medium is also given. FDTD is used to discretize transmission line in time and space, and iterative model of time-domain coupling response of communication cable is derived by correcting the voltage and current at the twisted part of the cable. Finally, factors that affect crosstalk are simulated, and results show that crosstalk is inversely proportional to the distance between lines and is directly proportional to the height from ground and the coupling length; for shielding layer, double-end grounding has the strongest anti-interference ability, non-grounding end has a significant interference during single-end grounding, and double-end floating has a worse anti-interference effect.