Skew adjusted data cable
First Claim
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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 in the first group of twisted pairs has a first twist lay, a first insulation thickness and a first nominal impedance;
wherein each twisted pair in 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 specified characteristic impedance of the cable is greater than about 2 Ohms and less than about 15 Ohms, and a difference between the second nominal impedance and the specified characteristic impedance of the cable is greater than about 2 Ohms and less than about 15 Ohms; and
wherein the cable has a skew of less than approximately 25 ns per 100 m.
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Abstract
A twisted pair cable wherein characteristics of the twisted pairs, such as twist lay, insulation thickness, characteristic impedance, etc. are selected so as to achieve minimal skew between the twisted pairs. In some examples, insulation materials may be varied among the twisted pairs and composite insulations may be used for one or more pairs in a cable.
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Citations
11 Claims
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1. A cable having a specified characteristic impedance comprising:
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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 in the first group of twisted pairs has a first twist lay, a first insulation thickness and a first nominal impedance; wherein each twisted pair in 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 specified characteristic impedance of the cable is greater than about 2 Ohms and less than about 15 Ohms, and a difference between the second nominal impedance and the specified characteristic impedance of the cable is greater than about 2 Ohms and less than about 15 Ohms; and wherein the cable has a skew of less than approximately 25 ns per 100 m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification