HIGH PERFORMANCE TELECOMMUNICATIONS CABLE

• US 20110005806A1
• Filed: 09/22/2010
• Published: 01/13/2011
• Est. Priority Date: 11/17/2004
• Status: Active Grant

• Current Assignee: Belden CDT (Canada) Inc. (Belden Inc.)
• Original Assignee: Belden CDT (Canada) Inc. (Belden Inc.)
• Inventors: Vexler, Gavriel, Dion, Yves, Humphrey, Eric, Bohbot, Michel, Richard, Michel
• Granted Patent: US 8,455,762 B2
• Time in Patent Office: Days
• US Class Current: 174/116
• CPC Class Codes: H01B 11/06 with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens

Abstract

A telecommunications cable comprising four twisted pairs of conductors and a separator spline comprised of a principal dividing strip and a first subsidiary dividing strip attached longitudinally along a first side of the principal dividing strip and a second dividing strip attached longitudinally along a second side of the principal dividing strip, the spline separating the four twisted pairs such that they are arranged in a staggered configuration. A method for reducing cross talk between adjacent cables in a telecommunications system, the method comprising the steps of, for each of the cables, providing a plurality of twisted pairs of conductors, winding an elongate filler element around the twisted pairs and covering the twisted pairs and the element with a cable jacket, the element introducing a visible distortion into an outer surface of the jacket.

Claims

1. A telecommunications cable comprising:

a plurality of twisted pairs of conductors arranged around and running along an axis; and

a cable jacket surrounding the plurality of twisted pairs, the jacket comprising a substantially circular outer surface and a substantially circular inner surface, wherein the inner surface and the outer surface are not concentric, and wherein the outer surface defines a tube having a helical centre path arranged around and running along the axis.

2. The telecommunications cable of claim 1, wherein a pitch of the helical centre path along the axis is random.

3. The telecommunications cable of claim 1, wherein the inner surface of the jacket is substantially parallel and collinear with the axis.

4. The telecommunications cable of claim 1, wherein the center path is at a geometrical center of the telecommunications cable.

5. The telecommunications cable of claim 1, further comprising a spline separating each of the plurality of twisted pairs.

6. A telecommunications cable comprising:

a plurality of twisted pairs of conductors arranged helically around and running along a first axis; and

a cable jacket surrounding the plurality of twisted pairs, the cable jacket comprising a single protrusion arranged around and running along the cable jacket, wherein the single protrusion is arranged helically around the first axis; and

wherein the single protrusion twists helically around the first axis in a direction opposite to that of the plurality of twisted pairs.

7. The telecommunications cable of claim 6, wherein the single protrusion runs along an outer surface of the cable jacket.

8. The telecommunications cable of claim 6, wherein a pitch of the helical twist of the protrusion along the first axis is random.

9. The telecommunications cable of claim 6, further comprising a spline separating each of the plurality of twisted pairs.

10. The telecommunications cable of claim 6, wherein the protrusion has a substantially semi-circular cross-sectional shape.

11. A telecommunications cable comprising:

a spline comprising a central portion and two side portions, the two side portions arranged on opposite sides of the central portion and offset from one another;

a first set of two twisted pairs of conductors arranged on opposite sides of and running along the central portion of the spline and separated by a first distance; and

a second set of two twisted pairs of conductors on opposite sides of and running along the central portion of the spline and separated by a second distance less than said first distance;

wherein each of said first set of twisted pairs has a twist lay which is shorter than a twist lay of either of said second set of twisted pairs.

12. The telecommunications cable of claim 11, further comprising:

a cable jacket surrounding the first and second sets of twisted pairs and the spline; and

an elongate filler element wound helically about the first and second sets of twisted pairs underneath the jacket.

13. The telecommunications cable of claim 12, wherein the first and second sets of twisted pair are wound helically about a central axis of the telecommunications cable;

and

wherein a direction of helical rotation of the elongate filler element about the twisted pairs is opposite to a direction of helical rotation of the twisted pairs about the central axis.

14. The telecommunications cable of claim 11, wherein the two side portions of the spline are attached approximately perpendicular to the central portion.

15. A telecommunications cable comprising:

a plurality of in parallel twisted pairs of conductors, wherein each of the twisted pairs has a constant twist lay and follows a helical path along an axis, the helical path having a variable pitch;

a cable jacket surrounding the twisted pairs; and

an elongate filler element wound helically around the twisted pairs underneath the cable jacket, and wherein a direction of rotation of the elongate filler element is opposite to a direction of rotation of the twisted pairs.

16. The telecommunications cable of claim 15, wherein the plurality of twisted pairs consists of four twisted pairs.

17. The telecommunications cable of claim 15, wherein the axis corresponds to a geometrical center path of the telecommunications cable.

18. The telecommunications cable of claim 15, further comprising a spline separating each of the plurality of twisted pairs.