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Low delay skew multi-pair cable and mehtod of manufacture

A low-latency, cable technology, applied in directions with twisted/quad twisted cables, etc., to solve problems such as lost data, impact, transmission errors, etc.

Inactive Publication Date: 2002-07-03
KRONE DIGITAL COMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Problems arise when the delay skew of a signal transmitted by one twisted pair and another twisted pair is too great and the device receiving the signal cannot properly recombine the signal
This delay skew produces transmission errors or lost data
[0006] In addition, in high-speed data communication applications, as the amount of data output increases, the delay skew problem may become more serious
Even if the transmitted signal is reassembled correctly, the delay due to the skew of the signal is significant and has an adverse effect on the output signal

Method used

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  • Low delay skew multi-pair cable and mehtod of manufacture
  • Low delay skew multi-pair cable and mehtod of manufacture
  • Low delay skew multi-pair cable and mehtod of manufacture

Examples

Experimental program
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example 1

[0028] As a first example, a stranded conductor, typically consisting of seven strands of 32 AWG wire, is twisted to form a first center conductor. The lay length (strand twist length) of the first center conductor is between 0.5 and 1.5 inches. Insulation is then applied to the first center conductor to form an insulated conductor. The two insulated conductors are then paired and twisted together to form a first twisted pair. Preferably, the strand length of the twisted center conductor is 0.5 to 1.5 times the lay length of the twisted pair. An additional twisted pair may be added to form the cable, and each additional twisted pair may have a different lay length than the first twisted pair. In this case, the second twisted pair may comprise a center conductor having a strand twist length that is less than the selected strand twist length of the first center conductor, as long as the second twisted pair has a twist length greater than the first twist length. The right twis...

example 2

[0030] A cable consisting of 4 twisted pairs (pairs 1-4) has the characteristics shown in Table 1:

[0031] right#

Strand twist length of center conductor

degrees (inches)

Twist length of twisted pair

(inch)

1

0.33

0.87

2

0.36

0.74

3

0.40

0.58

4

0.50

0.49

[0032] Center Conductor Outer Diameter: 0.24”

[0033] Insulated conductor outer diameter: 0.40”

[0034] Twisted wire outer diameter: 0.80”

[0035] Overall Outside Diameter of Cable: 0.250”

[0036] When constructed as described in Example 2, the inventive cable can realize a capacitance of 12.5 ± 0.5 pF / ft with an associated impedance of 100 ± 3Ω, thereby reducing and substantially eliminating delay skew and its associated data loss. Table 1 also shows the inverse relationship between the strand twist length of the center conductor and the lay length of the twisted pair...

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PUM

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Abstract

The invention is directed to a multi-pair cable having an outer jacket and at least two pairs of twisted wire cables having different lay lengths and being disposed within the jacket. The wires of each twisted wire pair have a conductor surrounded by an insulating material, wherein the conductors of the respective twisted wire pairs have different strand twist lengths. The lay lengths of the twisted wire pairs are correlated with the strand twist length of the conductors of the individual twisted wire pairs so that the phase delay of the twisted wire pairs of the cable is matched to within an acceptable range for data transmission. Conversely, where the lay lengths of the twisted wire pairs is specified, the strand twist lengths of the respective conductors of the individual twisted wire pairs can be correlated with the lay lengths of the twisted wire pairs so that the phase delay of the twisted wire pairs of the cable is brought to within an acceptable range for the intended application.

Description

[0001] This application claims priority to co-pending US Provisional Application Serial No. 60 / 136,674, filed May 28, 1999, entitled "Low Delay Skew Multi-Pair Cable and Method of Manufacture." This application is also related to pending U.S. Provisional Application Serial No. 09 / 322857, filed May 28, 1999, entitled "Optimizing LAN Cable Performance," and Serial No. 60 / 137,132, filed May 28, 1999, entitled Pending U.S. Provisional Application for "Tuned Patch Cable", and Pending U.S. Provisional Application Serial No. 09 / ___ filed on May 25, 2000, entitled "Tuned Patch Cable", these The content of the application is hereby incorporated by reference in its entirety. field of invention [0002] This invention relates to cables comprising twisted pairs, and more particularly, the present invention relates to cables comprising twisted pairs suitable for high speed data communication applications. Background of the invention [0003] One method of transmitting data and other sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B11/02
CPCH01B11/02
Inventor 斯普林·拉特里奇
Owner KRONE DIGITAL COMM INC