High performance data communications cable
Two electromagnetic interference (EMI) controlling tape application methodologies for unshielded twisted pair (UTP) cable include Fixed Tape Control (FTC) and Oscillating Tape Control (OTC). In FTC, tape application angle and edge placement are controlled to maintain position of the tape edges over a base of nonconductive filler in the cable. In OTC, the tape application angle is continuously varied, resulting in crossing of the tape edges over all of the pairs of conductors with varying periodicity. In both implementations, the filler allows a cylindrical shape.
1. A fixed tape control high performance data cable, comprising:
a plurality of twisted pairs of insulated conductors;
a filler comprising a plurality of arms separating each twisted pair of insulated conductors, each arm having a terminal portion;
a multi-layer conductive barrier tape surrounding the filler and plurality of twisted pairs of insulated conductors, the multi-layer conductive barrier tape comprising a continuous conductive material contained between two layers of a dielectric material, the conductive material of the barrier tape extending to each lateral edge of the two layers of the dielectric material; and
a jacket surrounding the conductive barrier tape;
wherein the filler is configured in a helical twist at a first angle; and
wherein the conductive barrier tape is configured in a helical twist at the first angle, and a seam of the conductive barrier tape is positioned above a terminal portion of an arm of the filler.
2. The fixed tape control high performance data cable of claim 1 , wherein a second seam of the conductive barrier tape is positioned above a terminal portion of a second arm of the filler, the second seam overlapping a portion of the conductive barrier tape.
3. The fixed tape control high performance data cable of claim 1 , wherein the seam of the conductive barrier tape is approximately centered above the terminal portion of the arm of the filler.
4. The fixed tape control high performance data cable of claim 1 , wherein the filler has four arms and a cross-shaped cross section.
5. The fixed tape control high performance data cable of claim 1 , wherein each twisted pair of insulated conductors is positioned in the center of a channel formed by two adjacent arms and corresponding terminal portions of the filler.
6. An oscillating tape control high performance data cable, comprising:
a plurality of twisted pairs of insulated conductors, each configured in a helical twist at a corresponding plurality of angles;
a filler comprising a plurality of arms separating each twisted pair of insulated conductors, the filler having a helical twist at a first angle distinct from the plurality of angles;
a conductive barrier tape surrounding the plurality of twisted pairs of insulated conductors comprising a conductive material contained between two layers of a dielectric material, the conductive material of the barrier tape extending to each lateral edge of the two layers of the dielectric material; and
a jacket surrounding the conductive barrier tape; and
wherein the conductive barrier tape is configured in a helical twist at an application angle varying between a second angle and a third angle, distinct from the first angle and distinct from the plurality of angles.
7. The oscillating tape control high performance data cable of claim 6 , wherein the barrier tape comprises a continuous conductive material contained between two layers of a dielectric material.
8. The oscillating tape control high performance data cable of claim 7 , wherein the second angle comprises the first angle minus a predetermined value and wherein the third angle comprises the first angle plus the predetermined value.
9. The oscillating tape control high performance data cable of claim 7 , wherein the application angle varies from the second angle and the third angle along a length of the cable longer than a length of one helical twist of the filler.
10. The oscillating tape control high performance data cable of claim 7 , further comprising a filler comprising a plurality of arms separating each twisted pair of insulated conductors, each arm having a terminal portion; and
wherein a position of a first seam of the conductive barrier tape varies from a first position above a first channel formed by two adjacent arms and corresponding terminal portions of the filler, to a second position over a terminal portion of a first arm of said adjacent arms.
11. The oscillating tape control high performance data cable of claim 10 , wherein the position of the first seam further varies to a third position over a second channel formed by the first arm of said adjacent arms and a third arm and corresponding terminal portions of the filler.
12. The oscillating tape control high performance data cable of claim 10 , wherein the filler has four arms and a cross-shaped cross section.
13. The oscillating tape control high performance data cable of claim 10 , wherein each twisted pair of insulated conductors is positioned in the center of a channel formed by a first arm and a first portion of a terminal portion of the first arm, and an adjacent second arm and a second portion of a terminal portion of the second arm identical to the first portion.
14. A method of manufacture of a high performance data cable, comprising:
helically twisting each of a plurality of twisted pairs of insulated conductors at a corresponding plurality of angles;
positioning a filler comprising a plurality of arms, each arm having a radially-symmetric terminal portion, the filler having a helical twist at a first angle distinct from the plurality of angles;
positioning each pair of the plurality of twisted pairs of insulated conductors within a channel formed by adjacent arms of the filler and corresponding terminal portions;
wrapping the helically twisted plurality of twisted pairs and filler with a conductive barrier tape at an application angle varying between a second angle and a third angle distinct from the plurality of angles, the conductive barrier tape comprising a conductive material contained between two layers of a dielectric material, the conductive material of the barrier tape extending to each lateral edge of the two layers of the dielectric material; and
jacketing the barrier tape and helically twisted filler and plurality of twisted pairs.
15. The method of claim 14 , wherein the second angle comprises the first angle minus a predetermined value and wherein the third angle comprises the first angle plus the predetermined value.
16. The method of claim 14 , wherein varying the application angle between the second angle and the third angle comprises positioning a feed of the conductive barrier tape tangent to a roller or bar; and moving the roller bidirectionally along a track in a direction at an angle to the length of the cable.
17. The method of claim 14 , wherein the conductive material of the barrier tape is a continuous layer.