Multi-pair communication cable using different twist lay lengths and pair proximity control

• US 7,015,397 B2
• Filed: 05/27/2003
• Issued: 03/21/2006
• Est. Priority Date: 02/05/2003
• Status: Expired due to Fees

• Current Assignee: Belden Technologies, LLC (Belden Inc.)
• Original Assignee: Belden CDT Networking, Inc. (Belden Inc.)
• Inventors: Clark, William
• Primary Examiner(s): Nguyen, Chau N.
• Application Number:
  US10/446,518
• Publication Number:
  US 20040149484A1
• Time in Patent Office: 1,029 Days
• Field of Search: 174/113.R, 174/113.C, 174/131.A, 174/36, 174/27
• US Class Current: 174/113.00R
• CPC Class Codes: H01B 11/04 with pairs or quads mutually positioned to reduce cross-talk

Abstract

A multi-pair cable including four twisted pairs of insulated conductors each having a respective unique twist lay length, thereby providing six twist deltas between the twist lay lengths of the four twisted pairs, wherein at least five of the six twist deltas are greater than 15%. Alternatively, a multi-pair cable including a first twisted pair of conductors having a first twist lay length, and a second twisted pair of conductors having a second twist lay length that is shorter than the first twist lay length, wherein the first and second twisted pairs of conductors are in physical contact with one another along substantially an entire length of the multi-pair cable, and wherein a difference between the first twist lay length and the second twist lay length is at least 15% of the second twist lay length.

Claims

1. A multi-pair cable comprising:

four twisted pairs of insulated conductors including a first twisted pair, a second twisted pair, a third twisted pair and a fourth twisted pair, each having a unique twist lay length, thereby providing six twist deltas between the respective unique twist lay lengths of the four twisted pairs;

wherein the first and second twisted pairs of insulated conductors are nested together and substantially physically separate the third and fourth twisted pairs; and

wherein each of the six twist deltas is greater than 15%.

2. The multi-pair cable as claimed in claim 1, wherein a first twist delta between the first and second twisted pairs is greater than a second twist delta between the third and fourth twisted pairs.

3. The multi-pair cable as claimed in claim 1, wherein a diameter of conductors of at least one of the first and second twisted pairs is larger than a diameter of conductors of the third and fourth twisted pairs.

4. The multi-pair cable as claimed in claim 1, further comprising at least one dielectric filler located adjacent the first and second twisted pairs of insulated conductors.

5. The multi-pair cable as claimed in claim 4, wherein at least one of the third and fourth twisted pairs of insulated conductors is spaced apart from the first and second twisted pairs of insulated conductors by the at least one dielectric filler.

6. The multi-pair cable as claimed in claim 4, wherein the at least one dielectric filler separates the third twisted pair and the fourth twisted pair, and wherein a twist delta between the third twisted pair and the fourth twisted pair is less than a twist delta between the first and second twisted pairs.

7. The multi-pair cable as claimed in claim 1, wherein each of the four twisted pairs of insulated conductors comprises a first insulated conductor and a second insulated conductor, and wherein each of the four twisted pairs of conductors comprises an individual metallic shield disposed about the first and second insulated conductors.

8. The multi-pair cable as claimed in claim 1, wherein an arrangement of the four twisted pairs of insulated conductors is such that any crosstalk between each of the four twisted pairs of insulated conductors meets industry standard category six requirements.

9. The multi-pair cable as claimed in claim 1, further comprising a jacket that surrounds the four twisted pairs of insulated conductors.

10. The multi-pair cable as claimed in claim 1, wherein the four twisted pairs of insulated conductors are cabled together in a same direction as a twist direction of the four twisted pairs of insulated conductors to form the multi-pair cable.

11. A multi-pair cable comprising:

a first twisted pair of insulated conductors having a first twist lay length; and

a second twisted pair of insulated conductors having a second twist lay length that is shorter than the first twist lay length;

a third twisted pair of insulated conductors; and

a fourth twisted pair of insulated conductors disposed such that the third and fourth twisted pairs are separated from one another by the first and second twisted pairs;

wherein the first and second twisted pairs of insulated conductors are nested together to form a central core of the multi-pair cable, the central core defining two interstices; and

wherein a difference between the first twist lay length and the second twist lay length is at least 15% of the second twist lay length.

12. The multi-pair cable as claimed in claim 11, further comprising at least one dielectric filler disposed in one of the two interstices of the central core.

13. The multi-pair cable as claimed in claim 12, wherein the third twisted pair of insulated conductors is spaced apart from the first and second twisted pairs of conductors by the at least one dielectric filler.

14. The multi-pair cable as claimed in claim 11, further comprising a third twisted pair of insulated conductors and a fourth twisted pair of insulated conductors, the third and fourth twisted pairs of insulated conductors being disposed at least partially within the two interstices of the central core.

15. The multi-pair cable as claimed in claim 14, wherein an arrangement of the first, second, third and fourth twisted pairs of insulated conductors is such that any crosstalk between each combination of the first, second, third and fourth twisted pairs meets industry standard category six requirements.

16. The multi-pair cable as claimed in claim 11, wherein a diameter of conductors of the first twisted pair of conductors is larger than a diameter of conductors of the third twisted pair of conductors.

17. The multi-pair cable as claimed in claim 11, further comprising a jacket surrounding the first and second twisted pairs of insulated conductors.

18. A multi-pair cable comprising:

a plurality of twisted pairs of insulated conductors including a first twisted pair having a first twist lay length, a second twisted pair having a second twist lay length, a third twisted pair having a third twist lay length and a fourth twisted pair having a fourth twist lay length to comprise six twist deltas between the first, second, third and fourth twisted pairs;

wherein the second twist lay length is at least 15% longer than the first twist lay length thereby providing a first twist delta of the six twist deltas of at least 15% between the first and second twisted pairs of insulated conductors;

wherein the third and fourth twist lay lengths are selected such that the remaining twist deltas of the six twist deltas between the first, second, third and fourth twisted pairs are equal to or larger than the first twist delta; and

wherein the first and second twisted pairs are nested together and substantially physically separate the third twisted pair from the fourth twisted pair.

19. The multi-pair cable as claimed in claim 18, wherein a diameter of conductors of at least one of the first and second twisted pairs is larger than a diameter of conductors of the third and fourth twisted pairs.

20. The multi-pair cable as claimed in claim 18, further comprising at least one dielectric filler located adjacent the first and second twisted pairs.

21. The multi-pair cable as claimed in claim 20, wherein at least one of the third and fourth twisted pairs of insulated conductors is spaced apart from the first and second twisted pairs of insulated conductors by the at least one dielectric filler.

22. A multi-pair cable comprising:

an first grouping including a first twisted pair of insulated conductors having a first twist lay length and a second twisted pair of insulated conductors having a second twist lay length;

an second grouping including a plurality of twisted pairs of insulated conductors;

wherein the second twist lay length is at least 15% longer than the first twist lay length thereby providing a first twist delta of at least 15% between the first and second twisted pairs;

wherein the first and second twisted pairs are nested together such that the first and second twisted pairs are in substantial physical contact along substantially an entire length of the multi-pair cable; and

wherein first grouping further comprises third and fourth twisted pairs of insulated conductors disposed within two interstices formed by nesting together of the first and second twisted pairs of insulated conductors.

23. The multi-pair cable as claimed in claim 22, wherein the first grouping further comprises a first dielectric filler located in an interstitial space formed by nesting of the first and second twisted pairs of insulated conductors.

24. The multi-pair cable as claimed in claim 23, wherein the plurality of twisted pairs of insulated conductors in the second grouping comprises at least fifth and sixth twisted pairs of insulated conductors, and wherein the second grouping further comprises a second dielectric filler disposed between the fifth and sixth twisted pairs of insulated conductors.

25. The multi-pair cable as claimed in claim 22, wherein the third twisted pair of insulated conductors has a third twist lay length that is at least 15% longer than the second twist lay length.

26. The multi-pair cable as claimed in claim 25, wherein the fourth twisted pair of insulated conductors has a fourth twist lay length that is at least 15% longer than the second twist lay length.

27. The multi-pair cable as claimed in claim 22, further comprising a jacket surrounding the first and second groupings.

28. A method of manufacturing a category six compliant multi-pair cable, comprising:

twisting together a first pair of insulated conductors with a first twist lay length;

twisting together a second pair of insulated conductors with a second twist lay length that is at least 15% greater than the first twist lay length;

twisting together a third pair of insulated conductors with a third twist lay length that is at least 15% greater than the second twist lay length;

twisting together a fourth twisted pair of insulated conductors with a fourth twist lay length that is at least 15% greater than the second twist lay length;

cabling the first and second twisted pairs of insulated conductors together such that the first and second pairs of insulated conductors are nested together in substantial physical contact along substantially an entire length of the multi-pair cable, thereby providing two intersticial spaces; and

cabling the third and fourth twisted pairs together with the first and second twisted pairs such that the third and fourth twisted pairs are disposed at least partially within the intersticial spaces provided by nesting together of the first and second twisted pairs.

29. The method as claimed in claim 28, further including a step of disposing a dielectric filler at least partially within one of the two intersticial spaces.

30. The method as claimed in claim 29, wherein the step of cabling includes cabling the first, second and third pairs of insulated conductors such that the third pair of insulated conductors is at least partially separated from the first and second pairs by the dielectric filler.

31. The method as claimed in claim 28, further including a step of twisting and arranging the first, second, third and fourth pairs of insulated conductors such that any crosstalk between each combination of the first, second, third and fourth pairs of insulated conductors is within industry standard category six requirements.

32. A method of manufacturing a category six compliant multi-pair cable, comprising:

twisting together a first pair of insulated conductors with a first twist lay length;

twisting together a second pair of insulated conductors with a second twist lay length that is at least 15% longer than the first twist lay length;

twisting together a third pair of insulated conductors with a third twist lay length that is at least 15% longer than the second twist lay length;

twisting together a fourth pair of insulated conductors with a fourth twist lay length that is at least 15% greater than the second twist lay length; and

cabling the first, second, third and fourth pairs of insulated conductors together such that the first and second twisted pairs are nested together, thereby defining two intersticial spaces adjacent abutting sides of the first and second pairs, and the third pair of insulated conductors is disposed adjacent the first and second pairs and on an opposite side of the first and second pairs from the fourth twisted pair.

33. The method as claimed in claim 32, further including a step of disposing a dielectric filler at least partially within one of the two intersticial spaces.