Electrical connectors – With insulation other than conductor sheath – Plural-contact coupling part
Patent
1995-05-03
1997-10-21
Bradley, P. Austin
Electrical connectors
With insulation other than conductor sheath
Plural-contact coupling part
439941, H01R 2302
Patent
active
056790279
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
a) Field of the Invention
The present application relates to a method and apparatus for cross talk cancellation and is particularly applicable to cancellation of cross talk in communications systems for data transmission.
b) Description of the Prior Art
In a typical data communication system, data and voice signals are passed along unshielded twisted pair (UTP) cables. In a typical cable system a plurality of twisted pairs are enclosed in a single cable. Such cables have, however, to be interconnected with, for example, peripheral equipment such as digital telephones, facsimile machines, etc. by means of plugs and jacks.
Thus the speed at which data is being passed along UTP cables is increasing all the time. It is therefore important that the connecting hardware (plugs and jacks) have at least equal transmission performance to that of the UTP otherwise the performance characteristic of any overall system may be compromised.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a method and apparatus for reducing cross talk in communication systems.
It is a further object to provide a jack socket incorporating apparatus for reducing cross talk on communication systems.
The present invention therefore provides a method of reducing cross talk in data communication systems in which an electrical signal is coupled onto a first signal path including generating an antiphase electrical signal in a second signal path and adding the antiphase signal to the electrical signal in the first signal path to cancel cross talk present on the first signal path.
The present invention also provides apparatus for reducing cross talk in data communication systems including a first conductive signal path and a second conductive signal path said first signal path including cross over connection means for changing over the position of the conductor of the first signal path at a point intermediate between the ends of the first and second conductive signal paths to reduce cross talk in the first and second conductive signal paths.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings in which:
FIG. 1 shows diagrammatically in side elevational cross section an eight way connecting system comprising a plug and jack socket illustrative of an embodiment of the present invention;
FIG. 2 shows the plug and socket of FIG. 1 in schematic rear elevation;
FIG. 3 shows the plug and socket of FIG. 1 in schematic front elevation;
FIG. 4 shows the arrangement of pairs of wires in an 8-way Western Electric or American WECO RJ45 connection system of the type shown in FIGS. 1 to 3;
FIG. 5 illustrates theoretically the principle of the present invention;
FIG. 6 illustrates the principles of cancellation of cross talk in accordance with the present invention using parallel conductive paths on a printed circuit;
FIG. 7 illustrates a particular example of cross talk cancellation used for the arrangement of conductors of FIG. 4; and
FIG. 8 shows an alternative cross talk cancellation system.
DESCRIPTION OF THE EMBODIMENTS
With reference now to FIGS. 1 to 3, a plug and jack socket arrangement 10 is shown comprising a plug 20 and a jack socket 30.
The plug comprises an eight contact system comprising individual connector contacts 22 in a body of plastics material 24. Each contact 22 is connected to one wire of an unshielded twisted pair (UTP) cable shown diagrammatically at 26. The cable 26 connects, for example, to an item of electrical equipment such as a facsimile machine, digital telephone, etc.
The plug 20 fits in a known manner within the socket 30 which comprises a plurality of contacts 32 which contact with the respective connector contacts 22. Only four contacts 32 are shown in FIGS. 2 and 3 for clarity.
In a known jack socket arrangement wires would be connected directly to the opposite ends 32' of the contacts 32. These wires are illustrated as dotted lines 34. These wires 3
REFERENCES:
patent: 5226835 (1993-07-01), Baker, III et al.
patent: 5282754 (1994-02-01), Kish et al.
patent: 5299956 (1994-04-01), Brownell et al.
patent: 5310363 (1994-05-01), Brownell et al.
patent: 5399107 (1995-03-01), Gentry et al.
patent: 5414393 (1995-05-01), Rose et al.
patent: 5454738 (1995-10-01), Lim et al.
Bradley P. Austin
Pressac Ltd.
Wittels Daniel
LandOfFree
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