Low cross talk plug and jack

Details Low cross talk plug and jack Low cross talk plug and jack

1999-12-21

2001-06-12

Bradley, Paula (Department: 2833)

Electrical connectors

With insulation other than conductor sheath

Plural-contact coupling part

C439S941000

Reexamination Certificate

active

06244906

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to electrical connectors and, more particularly, to a modular plug and jack of the type used in telecommunications equipment.
BACKGROUND OF THE INVENTION
Modular plug and jack connectors provide easy connect/disconnect capability between electrical circuits within telecommunications equipment. Such modular plugs and jacks are particularly popular in association with telephone sets, where they were first used, and more recently in association with a large variety of peripheral devices that are connected to telephone lines, e.g., modems, facsimile machines, personal computers, etc. However, conventional modular plug and jack connectors were not necessarily designed to handle the high speed data rates that are common place with many peripheral devices. As a result, problems have arisen as a result of the use of conventional modular plug and jack connector systems in non-conventional applications.
For example, it is well known in the art that cross-talk occurs when signals conducted over a first signal path, e.g., a pair of terminal contact wires associated with a communications connector, are partly transferred by inductive or capacitive coupling into a second signal path, e.g., another pair of terminal contact wires in the same connector. The transferred signals are defined as “cross-talk” in the second signal path, and such cross-talk degrades any signals that are routed over the second path. As data transmission speeds have increased, the deleterious effects of cross-talk on data transmissions has also increased. Numerous prior art connectors have been proposed for reducing the effects of such “cross-talk” by, e.g., adding compensating “cross-talk” to the overall circuit, i.e., adding capacitances to nullify or compensate for the inherent cross-talk in the system.
It is also the case that modular plug and jack connectors experience cross-talk and require compensating devices or circuits. Often, such modular plug and jack connectors are designed to compensate for plugs or jacks having a prescribed amount of cross-talk. This can be disadvantageous since the very circuitry that has been added for compensating for cross-talk in a particular plug or jack may in fact diminish signal integrity when mated to another plug or jack having less than the prescribed amount of cross-talk. As a result, there is a need for a low cross-talk plug and jack connector system which allows for “backward” compatibility with existing plug and jack systems.
SUMMARY OF THE INVENTION
The present invention provides a modular plug having a dielectric housing including a first end and a second end. The first end defines an electrical connector section having signal conductors arranged to mate with a modular jack. At least two substantially planar blades are positioned adjacent to one another in the first end such that a dielectric wall is positioned between the blades with an edge portion of each of the blades being electrically and mechanically accessible, wherein each of the blades is aligned with one of the signal conductors.
A modular jack is provided that includes an insulating body having an interior cavity communicating with a modular plug receiving opening formed in a front end of the body for receiving a complementary modular plug. A plurality of openings in the body communicate with the cavity and are sized and shaped to each receive a jack contact. A plurality of jack contacts are mounted within the cavity. Each jack contact has an engagement portion exposed within the cavity wherein each engagement portion of each of the jack contacts comprises an upper interface region and a lower interface region that are offset relative to one another such that the lower interface region is spaced away from the modular plug receiving opening.


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