Electrical connectors – Contact comprising cutter – Insulation cutter
Reexamination Certificate
2000-01-10
2001-11-20
Sircus, Brian (Department: 2839)
Electrical connectors
Contact comprising cutter
Insulation cutter
Reexamination Certificate
active
06319048
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to modular plugs for telecommunication systems and, more particularly, to such plugs with improved cross talk characteristics.
In unshielded twisted pair (UTP) data cabling systems, typically there are four pairs of wires in an insulating jacket. These systems are used in horizontal cabling as well as in patch cabling or patch cordage in which the cable is terminated in a RJ45 plug. There has been industry recognition of the need to control crosstalk in such systems, and a useful measurement parameter is designated terminated open circuit (TOC) which is the near end crosstalk (NEXT) characteristic measurement parameter that is used for connecting hardware performance verification in RJ45 plugs.
It has been recognized that the crimping procedure used in making the plug terminations may distort the TOC parameter; this crimping is used to force the insulation displacement contacts (IDC) through the insulation on the wires and also to securely engage the cable in the plug. Typically, the engagement of the cable within the plug is effected by a plug cable holding bar in the cable receiving cavity at the rear of the plug which is pressed firmly into the cable in the crimping operation. The distortion of the lay of the twisted pairs is one of the major causes of unsatisfactory and varying TOC values, and its effect can vary from plug to plug.
Accordingly, it is an object of the present invention to provide a novel modular plug for telecommunications systems using UTP cables in which the cable is securely engaged in the plug without excessive effect upon the TOC factor.
Another object is to provide such a modular plug which may be fabricated readily and relatively economically and which is easily assembled with UTP cable.
It is also an object to provide such a modular plug which facilitates the transition from the round configuration of the twisted pairs of the cable to a substantially planar or side-by-side orientation.
SUMMARY OF THE INVENTION
It has now been found that the foregoing and related objects may be readily attained in a modular plug for use with unshielded twisted pair (UTP) cable of circular cross section and having a multiplicity of twisted pairs of insulated wires comprises a stabilizer having an insert portion of generally rectangular cross section at one end with greater width than height, and having inner formations defining a multiplicity of laterally spaced, parallel channels for each of the wire pairs opening at the insert end of the stabilizer. The stabilizer is fabricated of a deformable material permitting crimping of the stabilizer. The other end of the stabilizer has an opening to receive the cable.
The plug housing is comprised of a pair of mating halves defining a cavity opening at one end thereof cooperatively dimensioned with and seating the insert end of the stabilizer. The housing provides adjacent its other end separate guide channels for each of the wires of the twisted pairs and insulation displacement contacts engageable with the wires. The housing is deformable about the stabilizer to effect secure engagement thereof.
In a preferred embodiment, the stabilizer is formed of mating halves which interengage and secure the wire pairs therein. Desirably, the mating halves of the stabilizer have interengaging elements which effect mechanical engagement thereof.
In another embodiment, there is included a heat-shrinkable sleeve adapted to encircle the cable and extend over the other end of the stabilizer to secure the cable in the stabilizer.
Desirably, the plug housing includes an intermediate portion providing a chamber in which the wires of each twisted pair are untwisted and led into the separate channels of the plug for engagement with the contacts.
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Aekins Robert A.
Kessler George
Smith Allen
Cummings & Lockwood
Dinh Phuong K T
Ortronics Inc.
Sircus Brian
LandOfFree
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