Method and apparatus for adjusting the coupling reactances between twisted pairs for achieving a desired level of crosstalk
First Claim
Patent Images
1. A terminated cable assembly having a desired crosstalk level comprising:
- a cable having a plurality of twisted pairs, the twisted pairs each having two insulated conductors, the cable having an exit region where the twisted pairs exit the cable;
a de-twisted region transversely adjacent to the exit region wherein the twisted pairs transition into an untwisted configuration and arranged to mate with connecting hardware;
an isolation element located in the de-twisted region of the cable, the isolation element controlling coupling between adjacent pairs;
wherein the isolation element has a window defined therethrough, the window having a specific size and location for selectively adjusting the coupling reactances to achieve the desired amount of crosstalk.
4 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for adjusting the coupling reactances between twisted pairs contained within a data communications cable is disclosed. An isolation element is used to isolate one or more twisted pairs of wires from the other twisted pairs of wires contained within the data communications cable. The isolation element may be constructed of dielectric, conductive, or ferromagnetic materials or a combination thereof. It may also include various shapes, patterns, and/or windows for creating a specified level of crosstalk among the twisted pairs contained within the cable.
103 Citations
31 Claims
-
1. A terminated cable assembly having a desired crosstalk level comprising:
-
a cable having a plurality of twisted pairs, the twisted pairs each having two insulated conductors, the cable having an exit region where the twisted pairs exit the cable;
a de-twisted region transversely adjacent to the exit region wherein the twisted pairs transition into an untwisted configuration and arranged to mate with connecting hardware;
an isolation element located in the de-twisted region of the cable, the isolation element controlling coupling between adjacent pairs;
wherein the isolation element has a window defined therethrough, the window having a specific size and location for selectively adjusting the coupling reactances to achieve the desired amount of crosstalk. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A terminated cable assembly having a desired crosstalk level comprising:
-
a cable having a plurality of twisted pairs, the twisted pairs each having two insulated conductors, the cable having an exit region where the twisted pairs exit the cable;
a de-twisted region transversely adjacent to the exit region wherein the twisted pairs transition into an untwisted configuration and arranged to mate with connecting hardware;
an isolation element located in the de-twisted region of the cable, the isolation element controlling the coupling between adjacent pairs;
whereinthe isolation element has a window defined therethrough, the window having a specific size and location selected to produce a desired magnitude of crosstalk.
-
-
11. A terminated cable assembly having a desired crosstalk level comprising:
-
a cable having a plurality of twisted pairs, the twisted pairs each having two insulated conductors, the cable having an exit region where the twisted pairs exit the cable;
a de-twisted region transversely adjacent to the exit region wherein the twisted pairs transition into an untwisted configuration and arranged to mate with connecting hardware;
an isolation element located in the de-twisted region of the cable, the isolation element controlling the coupling between adjacent pairs;
whereinthe isolation element having a window defined therethrough, the window having a specific size and location selected to produce a desired phase of crosstalk.
-
-
12. A terminated cable assembly having a desired crosstalk level comprising:
-
a cable having a plurality of twisted pairs, the twisted pairs each having two insulated conductors, the cable having an exit region where the twisted pairs exit the cable;
a de-twisted region transversely adjacent to the exit region wherein the twisted pairs transition into an untwisted configuration and arranged to mate with connecting hardware;
an isolation element located in the de-twisted region of the cable, the isolation element controlling the coupling between adjacent pairs wherein the isolation element has features which create compensating reactances between the plurality of twisted pairs; and
wherein the features include a window defined through the isolation element.- View Dependent Claims (13, 14, 15, 16, 17)
-
-
18. A terminated cable assembly having a desired crosstalk relative to a conventional cable comprising:
-
a cable having a plurality of twisted pairs, the twisted pairs each having two insulated conductors;
the cable further having a de-twisted region wherein the twisted pairs transition into an untwisted configuration and arranged to mate with connecting hardware;
a means for isolating the two insulated conductors of one of the plurality of the twisted pairs from the two insulated conductors of another plurality of twisted pairs, wherein in the means for isolating also adjusts the coupling reactances within the de-twisted region of the cable between the insulated conductors;
whereby the desired level of crosstalk between the twisted pairs is achieved;
wherein the means for isolating the two insulated conductors includes an isolation element for separating the two insulated conductors of one of the plurality of twisted pairs from the two insulated conductors of another of the plurality of twisted pairs; and
the isolation element includes at least one window element defined therethrough. - View Dependent Claims (19, 20, 21, 22)
-
-
23. A cable assembly having a repeatable level of crosstalk terminated with mating hardware, the cable comprising:
-
a cable containing a plurality of twisted pairs of conductors;
the cable having an exit region wherein the plurality of twisted pairs exit from the cable;
a first region adjacent to the exit region of the cable;
an isolation element having top and bottom surfaces, an end region distal to the exit region of the cable, and constructed and arranged to physically separate and at least partially electrically isolate each twisted pair from one another;
a second region adjacent to the end region of the isolation element, wherein each twisted pair is detwisted and oriented to electrically mate with the mating hardware;
wherein the plurality of twisted pairs of conductors have a distance between adjacent twists of wire equal to a twist lay, and the first region has a length between one-half and one twist lay. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
wherein each of the two sub-channels contains a single conductor of the twisted pair disposed within the main channel.
-
-
27. The cable as in claim 25 the isolation element further comprising a laminated structure.
-
28. The cable as in claim 27 wherein the laminated structure of the isolation element includes at least first, second, and third layers, wherein said first layer is a conductor and is disposed between said second and third layers, and the second and third layers are dielectric materials.
-
29. The cable as in claim 28 wherein the first layer is composed of stainless steel.
-
30. The cable as in claim 28 wherein the second and third layers are composed of Mylar tape.
-
31. The cable as in claim 28 wherein the first layer is at virtual ground with respect to the plurality of twisted pairs.
Specification