Data cable with cross-twist cabled core profile

• US 7,696,438 B2
• Filed: 01/08/2009
• Issued: 04/13/2010
• Est. Priority Date: 04/22/1997
• Status: Expired due to Fees

• Current Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Original Assignee: Belden Technologies, LLC (Belden Inc.)
• Inventors: Clark, William T, Pelletier, Alan
• Primary Examiner(s): Mayo, III; William H
• Application Number:
  US12/350,673
• Publication Number:
  US 20090120664A1
• Time in Patent Office: 460 Days
• Field of Search: 174/110.R, 174/113.R, 174/113.C, 174/113.AS, 174/115, 174/116, 174/36, 174/37
• US Class Current: 174/113.00R
• 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
• CPC Class Codes: H01B 11/08 Screens specially adapted for reducing cross-talk
• CPC Class Codes: H01B 7/184 Sheaths comprising grooves, ribs or other projections
• CPC Class Codes: H01B 7/40 with arrangements for facilitating mounting or securing

Abstract

Cables including a plurality of twisted pairs of insulated conductors, a separator disposed among the plurality of twisted pairs so as to physically separate a first twisted pair from a second twisted pair, and a jacket surrounding the plurality of twisted pairs and the separator. The jacket may include a plurality of protrusions extending away from an inner circumferential surface of the jacket toward a center of the cable. The plurality of protrusions are configured so as to hold the plurality of twisted pairs away from the inner circumferential surface of the jacket, and may provide an air gap between the plurality of twisted pairs of insulated conductors and the inner circumferential surface of the jacket. In one example, a boundary of the air gap adjacent the inner circumferential surface of the jacket is arc shaped.

Claims

1. A cable comprising:

a plurality of twisted pairs including a first twisted pair and a second twisted pair, each twisted pair comprising two insulated conductors helically twisted together;

a separator disposed among the plurality of twisted pairs so as to physically separate the first twisted pair from the second twisted pair; and

a jacket surrounding the plurality of twisted pairs and the separator, the jacket comprising a plurality of protrusions extending away from an inner circumferential surface of the jacket and shaped and arranged to cause the plurality of twisted pairs to be kept away from the inner circumferential surface of the jacket along substantially the entire length of the cable;

wherein the jacket, the plurality of twisted pairs of insulated conductors and the separator are helically twisted together to form the cable.

2. The cable of claim 1, wherein the plurality of twisted pairs, the separator and the jacket are helically twisted together with a cable twist lay that is within a range of about 2 to 6 inches.

3. The cable of claim 1, wherein the plurality of twisted pairs consists of four twisted pairs of insulated conductors.

4. The cable of claim 3, wherein the separator comprises a central core and four arms extending from the central core, adjacent pairs of the four arms defining four corresponding channels;

and

wherein the four twisted pairs are arranged about the separator with one twisted pair disposed in each of the four channels.

5. The cable of claim 1, wherein the jacket has a substantially circular cross-sectional shape.

6. The cable of claim 1, wherein the separator is a non-conductive separator.

7. The cable of claim 1, wherein the cable is an unshielded cable.

8. The cable of claim 1, wherein all protrusions of the plurality of protrusions are similarly sized.

9. The cable of claim 1, wherein the jacket is helically twisted to form the cable so that the plurality of protrusions form helical ridges that cause the plurality of twisted pairs to be kept away from the inner circumferential surface of the jacket along substantially the entire length of the cable.

10. A cable comprising:

a plurality of twisted pairs including a first twisted pair and a second twisted pair, each twisted pair comprising two insulated conductors helically twisted together;

a separator disposed among the plurality of twisted pairs so as to physically separate the first twisted pair from the second twisted pair; and

a jacket surrounding the plurality of twisted pairs and the separator, the jacket comprising a plurality of protrusions extending away from an inner circumferential surface of the jacket and shaped and arranged to provide an air gap between the plurality of twisted pairs and the inner circumferential surface of the jacket;

wherein the plurality of twisted pairs, the separator and the jacket are helically twisted together along their lengths to form the cable.

11. The cable of claim 10, wherein the plurality of protrusions are shaped and arranged such that when the jacket is helically twisted to form the cable, the plurality of protrusions form helical ridges that cause the plurality of twisted pairs to be kept away from the inner circumferential surface of the jacket along substantially the entire length of the cable.

12. The cable of claim 10, wherein the plurality of twisted pairs consists of four twisted pairs.

13. The cable of claim 12, wherein the separator comprises a central core and four arms extending from the central core, adjacent pairs of the four arms defining four corresponding channels;

and

wherein the four twisted pairs are arranged about the separator with one twisted pair disposed in each of the four channels.

14. The cable of claim 10, wherein the jacket has a substantially circular cross-sectional shape.

15. The cable of claim 10, wherein the separator is a non-conductive separator.

16. The cable of claim 10, wherein the cable is an unshielded cable.

17. The cable of claim 10, wherein all protrusions of the plurality of protrusions are similarly sized.

18. A cable comprising:

a plurality of twisted pairs;

a separator arranged between the plurality of twisted pairs so as to separate one of the plurality of twisted pairs from others of the plurality of twisted pairs; and

a jacket comprising a plurality of protrusions extending away from an internal surface of the jacket such that the plurality of protrusions extend into the cable toward the plurality of twisted pairs;

wherein the jacket, the plurality of twisted pairs of insulated conductors and the separator are helically twisted together to form the cable; and

wherein the plurality of protrusions are shaped and arranged such that when the jacket is helically twisted, the plurality of protrusions form helical ridges that cause the plurality of twisted pairs to be kept away from the internal surface of the jacket along substantially the entire length of the cable.

19. The cable of claim 18, wherein the plurality of twisted pairs consists of four twisted pairs.

20. The cable of claim 19, wherein the separator comprises a central core and four arms extending from the central core, adjacent pairs of the four arms defining four corresponding channels;

and

wherein the four twisted pairs are arranged about the separator with one twisted pair disposed in each of the four channels.

21. The cable of claim 18, wherein the separator is a non-conductive separator.

22. The cable of claim 18, wherein all protrusions of the plurality of protrusions are similarly sized.

23. The cable of claim 18, wherein the cable is an unshielded cable.