Accession Number : ADP000566

Title :   Power Sum Crosstalk of PIC Cables As a Function of Cable Design,

Corporate Author : BELL TELEPHONE LABS INC NORCROSS GA

Personal Author(s) : Refi,James J.

Report Date : NOV 1982

Pagination or Media Count : 8

Abstract : A previous study of the crosstalk performance of the various designs of plastic insulated conductor (PIC) cables used in the Bell System (air core and waterproof, solid and expanded insulations, 19 through 26-gauge, 83 nF/mile and low capacitance) showed that the mean power sum far-end crosstalk (FEXT) of these various designs is a function of their average pair twist helix angle. The present paper extends this previous work to other forms of power sum crosstalk such as worst pair FEXT, within unit worst pair near-end crosstalk (NEXT), and within unit mean NEXT. The analyses in this paper further show that not only is the frequency scaling of mean FEXT a function of average twist helix angle (as found in the previous paper), but that the frequency scalings of worst pair FEXT, worst pair NEXT and mean NEXT also depend on average twist helix angle. Linear regression equations are presented and that can be used to calculate the mean and worst pair FEXT and NEXT performance of most copper PIC cables used in the Bell system. In addition, as long as pair twist schemes are judiciously chose, these equations can also be used to predict the crosstalk performance of new cable designs simply from their diameter over dielectric, average twist frequency, and median twist frequency. (Author)

Descriptors :   *Fiber optics transmission lines, *Electric cables, *Electric wire, *Symposia, *Waterproofing, Experimental design, Crosstalk, Polymers, Insulation, Cores, Electrical conductivity, International

Distribution Statement : APPROVED FOR PUBLIC RELEASE