Electrical connectors – With insulation other than conductor sheath – Plural-contact coupling part
Patent
1997-04-08
1999-06-22
Abrams, Neil
Electrical connectors
With insulation other than conductor sheath
Plural-contact coupling part
439941, H01R 2302
Patent
active
059137029
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns an electrical connector comprising a plurality of inputs and a plurality of outputs electrically interconnected by means of spaced electrical conductors mounted on an electrically insulative surface.
The electrical connector with which the invention is concerned is intended particularly for high bit rate network jacks in which the conductors carry electrical signals at frequencies above 1 MHz.
These jacks are of the "telephone jack" or RJ45 type. Examples of such jacks are described in FR-A-2 694 456 and U.S. Pat. No. 5,186,647. These jacks comprise a jack body that is mounted on a chassis or a wall-mounting box. The jack body includes a base plate provided with wire contacts adapted to make the connection to a complementary plug.
For signals at frequencies below 1 MHz, cross-talk is compensated by transposition of the conductors connected to the base plate, i.e. by twisting them in pairs. However, cross-talk compensation is insufficient when the frequency of the signal exceeds 1 MHz and it is necessary to compensate it at the level of the contacts in the jacks and therefore to cross the inputs and the outputs over in pairs.
In the case of RJ45 type jacks, the standard arrangement establishes the following correspondence between the contact points of the inputs and the outputs: corresponding to the outputs of the connector and the letters A, B, C, D, E, F, G, H to the inputs.
With a view to compensating cross-talk patent U.S. Pat. No. 5,186,647 teaches the crossing over of conductors in the form of uninsulated wires in an area in which the wires are parallel.
This solution necessitates the production of conductors provided with crossover areas in the region in which they are retained in the insulation and requires the insulation to be provided with multiple separator partitions. This solution is difficult to implement for crossing over non-contiguous wires.
The aim of the present invention is to remedy this drawback.
SUMMARY OF THE INVENTION
Accordingly, the invention is directed to an electrical connector comprising a plurality of inputs and a plurality of outputs electrically interconnected by means of spaced electrical conductors mounted on an electrically insulative surface.
In accordance with the invention, this connector is characterized in that the inputs are in a first plane of said surface and the outputs are in a second plane of said surface, each input being connected to the corresponding output by a conductor that has a first part in the first plane and a second part in the second plane, the two parts being joined together at the intersection of the two planes, and in that the inputs are symmetrically aligned about the intersection between the two planes.
Thus the invention transposes the conductors by a simultaneous change of plane of all the connection points, without the conductors crossing over. This change of plane considerably reduces magnetic coupling between the conductors (i.e. cross-talk).
This principle allows any input/output transposition configuration without increasing the length of the conductors.
In a preferred version of the invention the two planes of the insulative surface are perpendicular.
The outputs are preferably parallel to the intersection of the two planes and the conductors in the plane of the outputs are preferably parallel to each other.
In a first version the inputs are disposed in two rows.
In a second version the inputs are aligned in a single row.
Another feature of the present invention concerns the base plate of the network jack which is molded in one piece from plastics material, the conductors being either molded into the base plate or inserted into openings formed in the base plate.
In accordance with another feature of the present invention, the base plate may also include a first substantially parallelepiped-shape block surmounted by a second block extending vertically from the middle of the first block, the inputs being aligned on the face of the first block opposite the second block, the o
REFERENCES:
patent: 4790769 (1988-12-01), Kanada
patent: 5299956 (1994-04-01), Brownell et al.
patent: 5536182 (1996-07-01), Atoh et al.
Abrams Neil
Framatome Connectors International
Standig Barry M. L.
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