TWISTED PAIR CABLE HAVING IMPROVED CROSSTALK ISOLATION

• US 20090071691A1
• Filed: 10/07/2008
• Published: 03/19/2009
• Est. Priority Date: 12/09/2005
• Status: Active Grant

• Current Assignee: Belden Inc.
• Original Assignee: Belden Technologies, LLC (Belden Inc.)
• Inventors: Clark, William T.
• Granted Patent: US 8,198,536 B2
• Time in Patent Office: Days
• US Class Current: 174/116
• CPC Class Codes: H01B 11/04 with pairs or quads mutually positioned to reduce cross-talk
• CPC Class Codes: H01B 11/06 with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens

Abstract

A cable that provides reduced alien crosstalk between similar twisted pairs in cables that are in close proximity to one another and/or crosstalk between twisted pairs of the cable. In one example, a cable includes first, second and third twisted pairs, a shaped filler including a body portion and a plurality of tines extending outward from the body portion, the plurality of tines defining a plurality of channels in which the twisted pairs are individually disposed, and an outer jacket surrounding the twisted pairs and the shaped filler, wherein the shaped filler is constructed such that the body portion provides a first spacing between the first twisted pair and the second twisted pair, and one of the plurality of tines provides a second spacing between the second twisted pair and the third twisted pair, with the filler configured such that the second spacing is substantially smaller than the first spacing.

Claims

1. A data cable comprising:

a plurality of twisted pairs of insulated conductors including a first twisted pair, a second twisted pair and a third twisted pair;

a shaped filler including a body portion and a plurality of tines extending outward from the body portion, the plurality of tines defining a plurality of channels in which the plurality of twisted pairs of insulated conductors are individually disposed; and

an outer jacket surrounding the plurality of twisted pairs of insulated conductors and the shaped filler along a length of the cable; and

wherein the shaped filler is constructed such that the body portion provides a first spacing between the first twisted pair and the second twisted pair, and one of the plurality of tines provides a second spacing between the second twisted pair and the third twisted pair, with the filler configured such that the second spacing is substantially smaller than the first spacing.

2. The data cable of claim 1, wherein the body portion is constructed so as to provide a helical circumferential barrier extending along a length of the cable to facilitate reduction of alien crosstalk.

3. The data cable of claim 1, wherein the body portion of the shaped filler has an oblong shape.

4. The data cable of claim 1, wherein the first and second twisted pairs of conductors have the most similar twist lay lengths of the first, second, and third twisted pairs of conductors.

5. The data cable of claim 1, wherein the tines of the shaped filler extend beyond an outer circumference of the first, second and third twisted pairs of conductors.

6. The data cable of claim 5, wherein the tines include a flange portion that creates an opening for each channel that is narrower than a diameter of the twisted pairs of conductors.

7. The data cable of claim 1, wherein the shaped filler comprises a channel.

8. The data cable of claim 1, wherein the plurality of twisted pairs of insulated conductors and the shaped filler comprise a core of the cable, wherein the outer jacket is provided with a plurality of protrusions extending away from an inner circumferential surface of the jacket, and wherein the plurality of protrusions are configured to cause the core to be kept away from the inner circumferential surface of the jacket.

9. The data cable of claim 1, wherein the shaped filler comprises a flame-retardant, low-dielectric constant, low-dissipation factor polymer.

10. The data cable of claim 1, wherein the shaped filler comprises a foamed flame retardant, cellular polyolefin.

11. The data cable of claim 1, wherein the shaped filler comprises a fluoropolymer.

12. The data cable of claim 1, wherein the shaped filler comprises foamed fluorinated ethylene propylene.

13. The data cable of claim 1, wherein the shaped filler comprises foamed polyvinyl chloride.

14. The data cable of claim 1, whereon the body portion of the shaped filler defines an interior channel.