Patent ID: 6300573
Filing Date: 2001-10-09
Classification: H01B

Abstract:
A communication cable comprising a central interposer having cross sectional area S1, four twisted wire pairs T1, T2, T3 and T4 made by twisting pairs of insulated wires each made by covering an electrically conductive wire with an insulating material, each pair being twisted with a twist pitch different from the others, and one or more inter-pair interposers, wherein said four twisted wire pairs and said one or more inter-pair interposers are disposed around said central interposer while being entwined with each other, pitch P1 of said twisted wire pair T1, pitch P2 of said twisted wire pair T2, pitch P3 of said twisted wire pair T3 and pitch P4 of said twisted wire pair T4 are set to satisfy a relationship of inequality P1<P2<P3<P4, a diameter d of each insulated wire that constitutes the twisted wire pairs and said cross sectional area S1 of the central interposer are set to satisfy the relationship of inequalityS1.gtoreq.[{4.1 d/(1+2)}.multidot.0.35].sup.2.times..pi.while the one or more inter-pair interposers that is or are entwined with said twisted wire pairs is or are located at such a position as adjoins the twisted wire pair T1 having the least pitch P1 with a specific dielectric constant that decreases the propagation delay time of the adjoining twisted wire pair T2 and does not adjoin the twisted wire pair T4 having the largest pitch P4.