Accession Number:

ADP000564

Title:

A Crosstalk Model for Cross-Stranded Cables,

Descriptive Note:

Corporate Author:

NORGES TEKNISKE HOEGSKOLE TRONDHEIM ELECTRONICS RESEARCH LAB

Personal Author(s):

Report Date:

1982-11-01

Pagination or Media Count:

14.0

Abstract:

A statistical model is presented which relates crosstalk both in cross-stranded and ordinary pair cables to cable geometry, assuming that crosstalk is mainly caused by irregular twisting. Cable geometry of cross-stranded cables has been characterized by photographical measurements, and it is shown how variations in cable geometry is transformed into variations in coupling power unit length and finally into average near end and far end crosstalk. The model has been compared to extensive crosstalk measurements for one specific type of cable, and it correctly predicts the variations of crosstalk with length, frequency, and twist periods of the cable. The model is suitable for optimizing twist periods, and it shows that twist periods of different pairs should be well separated. For existing cross-stranded cables crosstalk can be improved by choosing essentially shorter twist periods of all pairs. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE