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Method and apparatus for measuring far end interference in order to determine isoelectric level for end interference

A far-end crosstalk and equal-level technology, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, can solve problems such as inability to accurately express system characteristics

Inactive Publication Date: 2008-08-06
JOHN FLUKE MFG CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because of the use of this particular wiring, the test structure is not the actual structure that will ultimately carry the data outside of the test conditions, since the user wiring is removed during the test
Therefore, measurements may not accurately represent the characteristics of the system once special wiring has been removed

Method used

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  • Method and apparatus for measuring far end interference in order to determine isoelectric level for end interference
  • Method and apparatus for measuring far end interference in order to determine isoelectric level for end interference
  • Method and apparatus for measuring far end interference in order to determine isoelectric level for end interference

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Embodiment Construction

[0028] A system according to a preferred embodiment of the present invention includes, for example, a network test instrument with microprocessor controlled operation. The system is configured to perform various measurements and use these measurements to accurately determine all transmission parameters, especially far-end crosstalk.

[0029]In implementing the present invention, two important assumptions are used. First, crosstalk originating from capacitive and inductive imbalances causes crosstalk currents in the disturbed pair of wires, which have a fixed (90° or 270°) phase angle, where the crosstalk occurs. This is clearly seen in the circuit model of crosstalk in twisted-pair wiring (Transmission Systems for Communications, Fourth Edition, February 1970, Member of Technician Bell Laboratories: Chapter 11, Crosstalk, pp. 11.3 node coupling crosstalk). The distance to the measurement point causes a change in phase angle which is proportional to the frequency of the test ...

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Abstract

A system for determining FEXT and ELFEXT of generic cabling systems provides accurate measurements of these parameters by determining and removing the effect of the connectors at the respective ends of the link, thereby giving measurement values that correspond to the defined link, rather than including the crosstalk contributions of the connectors, which can be substantial.

Description

technical field [0001] The present invention relates to the measurement of far-end crosstalk (FEXT) and the determination of equal-level crosstalk (ELFEXT). Background technique [0002] Transmission performance parameters such as attenuation, near-end crosstalk, return loss, and equal level crosstalk (ELFEXT) are extremely important in twisted pair cabling typically used in local area network (LAN) systems. [0003] For 1000BASE-T (1 Gbps Ethernet) currently under development by the IEEE 802.3ab committee, the ELFEXT performance of the link is important for satisfactory operation. [0004] 1, it is a schematic diagram of a typical 1Gbps Ethernet link between a workstation and a LAN device. The 1Gbps Ethernet link between a workstation 10 and a LAN device 12 uses 4 wire pairs 14, 16, 18 and 20, each There is bi-directional transmission (send and receive) on the wire pair. One of the modes of signaling for 1 Gbps Ethernet over twisted pair cabling involves signals that are ...

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Application Information

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IPC IPC(8): H04B3/46G01R27/04G01R27/28G01R31/02G01R31/08
CPCH04B3/464H04B3/487G01R31/08
Inventor 亨里克斯·科曼杰弗里·S·博特曼
Owner JOHN FLUKE MFG CO INC