Patent ID: 7030321
Filing Date: 2006-04-18
Classification: H01B

Abstract:
1. A cable having a specified characteristic impedance comprising: a plurality of twisted pairs of insulated conductors designated into a first group of twisted pairs and a second group of twisted pairs; wherein each twisted pair designated into the first group of twisted pairs has a first twist lay, a first insulation thickness and a first nominal impedance; wherein each twisted pair designated into the second group of twisted pairs has a second twist lay, a second insulation thickness and a second nominal impedance; and wherein a first combination of the first twist lay and the first insulation thickness, and a second combination of the second twist lay and the second insulation thickness are selected such that a difference between the first nominal impedance and the second nominal impedance is greater than about 2 Ohms and less than about 15 Ohms, and the cable has a skew of less than approximately 25 ns per 100 m.