Off-set communications cable

• US 7,145,080 B1
• Filed: 11/08/2005
• Issued: 12/05/2006
• Est. Priority Date: 11/08/2005
• Status: Expired due to Fees

• Current Assignee: Hitachi Cable America Incorporated (Proterial Ltd.)
• Original Assignee: Hitachi Cable Manchester Incorporated (Hitachi, Ltd.)
• Inventors: Boisvert, Kevin, Urbina, Eugenio, Griggs, Brian
• Primary Examiner(s): Mayo, III, William H.
• Application Number:
  US11/269,865
• Time in Patent Office: 392 Days
• Field of Search: 174/36, 174/28, 174/110.R, 174/113.R, 174/120.R, 174/113.AS, 174/113.C, 174/120.SR, 174/120.SP
• US Class Current: 174/110.00R
• CPC Class Codes: H01B 11/06 with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens

Abstract

A cable includes an outer sleeve for offsetting an inner jacket from a central axis of the outer sleeve in order to reduce crosstalk between adjacent cables. In one embodiment, an inner surface of the outer sleeve includes a plurality of fingers of different length extending inwardly to support the inner jacket offset from the central axis of the outer sleeve. The inner jacket may include two or more twisted pairs of electrical conductors and is supported in the offset position in order to randomize the location of the twisted pairs between cables when the cables are bundled together. In one embodiment, the cable also includes an inner divider core for further reducing crosstalk between adjacent twisted pairs within the cable.

Claims

1. An offset cable for reducing crosstalk between adjacent cables, comprising:

an inner tubular jacket having a center point;

two or more pairs of conductors supported within the inner tubular jacket;

an outer sleeve including a center point, the outer sleeve being disposed about the inner tubular jacket;

a plurality of teeth supported between the inner tubular jacket and the outer sleeve, the plurality of teeth each having a length that extends between the inner tubular jacket and the outer sleeve, the length of the plurality of teeth being varied relative to each other; and

wherein when assembled, the inner tubular jacket is held in an offset position relative to the outer sleeve by the plurality of teeth, such that the center point of the inner tubular jacket is not aligned with the center point of the outer sleeve.

2. The offset cable of claim 1, further comprising a core member constructed and arranged to physically separate the two or more pairs of conductors within the inner tubular jacket.

3. The offset cable of claim 1, wherein the plurality of teeth gradually increase in length from a first point adjacent the outer sleeve to a second point opposite the first point.

4. The offset cable of claim 1, wherein the plurality of teeth have a shape selected from the group consisting of a generally triangular shape, generally rectangular shape and a generally rounded shape.

5. The offset cable of claim 1, wherein the plurality of teeth are supported on an inner wall of the outer sleeve.

6. The offset cable of claim 1, wherein the plurality of teeth are supported on an outer wall of the inner jacket.

7. The offset cable of claim 1, wherein the plurality of teeth are supported on an annular member disposed between the outer sleeve and the inner jacket.

8. The offset cable of claim 1, wherein the two or more pairs of conductors comprise two or more twisted pairs.

9. The offset cable of claim 1, in combination with at least one other offset cable, wherein the offset cables are bundled together into a hybrid cable.

10. The offset cable of claim 1, wherein the plurality of teeth extend substantially around the entire inner surface of the cable.

11. A hybrid cable assembly having reduced crosstalk, comprising:

an outer jacket;

two or more internal cables disposed within the outer jacket, each of the two or more cables comprising;

a) an inner tubular jacket having a center point;

b) two or more twisted pairs of conductors supported within the inner tubular jacket;

c) an outer sleeve including a center point, the outer sleeve being disposed about the inner tubular jacket;

d) a plurality of teeth supported between the inner tubular jacket and the outer sleeve, the plurality of teeth each having a length that extends between the inner tubular jacket and the outer sleeve, the length of the plurality of teeth increasing from a first point adjacent the outer sleeve to a second point opposite the first point so as to hold the inner tubular jacket in an offset position relative to the outer sleeve, such that the center point of the inner tubular jacket is not aligned with the center point of the outer sleeve; and

wherein the distribution of the two or more cables is randomized within the outer jacket by the offsetting of the inner jacket relative to the outer sleeve so as to reduce cross talk between the two or more cables.

12. The hybrid cable assembly of claim 11, wherein the plurality of teeth have a shape selected from the group consisting of a generally triangular shape, generally rectangular shape and a generally rounded shape.

13. The hybrid cable assembly of claim 11, wherein the plurality of teeth are supported on an inner wall of the outer sleeve.

14. The hybrid cable assembly of claim 11, wherein the plurality of teeth are supported on an outer wall of the inner jacket.

15. The hybrid cable assembly of claim 11, wherein the plurality of teeth are supported on an annular member disposed between the outer sleeve and the inner jacket.

16. The hybrid cable assembly of claim 11, further comprising an inner core constructed and arranged to physically separate the two or more twisted pairs of conductors within the inner tubular jacket.