Communication cable twisting pitch optimization method based on double-target simulated annealing algorithm and non-inferior layering

[0064] logarithm n A 25 communication cable is an example.

[0065] (1) The design parameters of the communication cable are initialized, and the 25 wire pairs are twisted in three layers of 3+9+13 (as attached image 3 ) arrangement, and the numbers in the figure are line pairs. Select the length of the communication cable as , the diameter of the wire core (i.e. copper core) is , to determine the distance from the center of the pair to the center of the conductor , the equivalent dielectric constant , the relative magnetic permeability ,but:

[0066] (11)

[0067] (12)

[0068] According to the design standard, determine the optimal range of stranding pitch ( ), set the minimum value of near-end crosstalk attenuation ( ).

[0069] (2) Design objective function

[0070] 1) Optimizing objective function 1: Conductor usage. Calculate the amount of conductors according to formula 1, where the stranding coefficient is determined by the stranding pitch.

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