High performance data cable
A data cable, high-performance technology, applied in communication cables, insulated cables, cable/conductor manufacturing, etc., can solve problems such as non-adherence, uneven attenuation, and poor impedance value
Inactive Publication Date: 2005-05-25
BELDEN WIRE & CABLE
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AI Technical Summary
Problems solved by technology
The small wrap angle of metal shielding tape often causes problems during wiring operations for the tape to unwind before it is captured by the wire tie or spiral wrap drain wire
[0003] Also, the tape usually does not fit snugly against the underlying pair
This process creates a band gap around the unshielded twisted pair core which is not grounded stably enough to meet industry standard electrical requirements such as CENELEC prEN50288-4-1
[0004] The known cable constructions described above are mechanically unstable under static conditions and have unreliable electrical performance under installed conditions since a single integral braid is not sufficient to ensure that the tape coating does not "flower" when the cable is bent
This "blooming" can lead to an increase in Near-End Crosstalk (NEXT) due to ground disruption and further erode impedance / RL performance
This will make the attenuation uneven
Impedance values may even deteriorate in the bent state due to changes in conductor center spacing and ground plane
Method used
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Effect test
example
[0030] A 99.97 meter (328 ft) long 99.97 meter (328 ft) length of the above high performance data cable having four twisted shielded twisted pairs 10B bundled with a metal braid was tested at 23.0°C. The impedance of each of the four helically shielded twisted-pair pairs is tested from 0.3 to 600 MHz. Perform at least 350 detections between 1.0 and 600MHz.
[0031] The first helical shielded twisted pair has a standard impedance deviation of 3.2294 in a range of 98.5280 mean impedance.
[0032] The second helically shielded twisted pair has a standard impedance deviation of 2.7258 over a range of 96.5 mean impedances.
[0033] The third helical shielded twisted pair had a standard impedance deviation of 2.8652 obtained over a range of 97.9824 mean impedances.
[0034] The fourth helical shielded twisted pair had a standard impedance deviation of 2.6130 obtained over a range of 100.4164 mean impedance.
[0035] The high performance cable 20 of this example has an average sta...
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Abstract
An improved high performance twisted pair data cable having a calculated impedance standard deviation of less than 3.5 at an average impedance of 90 to 110 ohms at a maximum of 50 to 200 ohms. The twisted pair is helically wrapped with metal shielding tape under tension to provide a shielded twisted pair with a cross-sectional void of less than 25%, preferably less than 18%. The tape is helically wrapped at 35-45 degrees to the longitudinal axis of the cable with an overlap of 30-45%. This cable has a frequency up to 600MHz.
Description
technical field [0001] The present invention relates to a high performance data cable capable of successfully transmitting in the frequency range from 0.3 MHz to 600 MHz. In particular, the present invention provides a helically shielded twisted pair having an impedance standard deviation of 3.5 or less at an average impedance of about 50 to 200 ohms. In addition, the present invention provides a high performance data cable comprising several pairs of helically shielded twisted wires and having an average standard deviation of 3.5 or less, with no single standard deviation greater than 4.5 for all cables. Background technique [0002] Existing high performance data cables can typically use heavy rigid 0.051 mm (2 mil) aluminum tape backed with 0.025 mm (1 mil) polyester (Mylar) as the shield. The shield is wrapped around each unshielded pair subgroup for a wrap length equal to the overall lay length of the cable, typically 101.6 to 152.4 mm (4.0 to 6.0 in.) . The strip is...
Claims
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IPC IPC(8): H01B11/02H01B7/00H01B11/10H01B11/06H01B13/00
CPCH01B11/02H01B11/1025
Inventor 盖伦·M·加雷
Owner BELDEN WIRE & CABLE