Telecommunications networks utilize cables designed to maintain signal integrity. The cables include pairs of twisted copper wires surrounded by a cable jacket. The cables are terminated by a plug that secures the ends of the copper wires for alignment and contact with a series of plug contacts. When the plug is inserted into a matching jack, the plug locks into place and the plug contacts transmit the signal to corresponding contacts inside the jack. An RJ45 type connector plug is one example of a plug that can be used to terminate a cable.
Each plug contact includes tines where contact is made with a copper wire. The tines of each plug contact are offset towards opposite sides of the mating wire. The offset is small because the plug contacts are slotted close together inside the plug housing in order to align with the contacts of the jack. A reliable connection requires that the tines of each plug contact fall on opposite sides of each wire so that they straddle the wire. When this occurs, the plug contact and wire deform with some resilience such that a contact force is created and maintained.
It can be challenging to achieve reliable connections between the plug contacts and the copper wires inside the plug because it is difficult to align the tines of the planar plug contacts with the linearly positioned wires. For this and other reasons, improvements are desirable.
One aspect relates to a modular plug for terminating a telecommunications cable having twisted pairs of wires. The modular plug comprises a housing defining an internal cavity and one or more slots on a distal end thereof; one or more plug contacts held by the slots of the housing, each plug contact structured to form an electrical interface with a wire from the twisted pairs of wires; a wire manager inside the internal cavity, the wire manager structured to receive the twisted pairs of wires inside the housing; and a wire sled extending from the wire manager, the wire sled defining one or more grooves each shaped to position a wire from the twisted pairs of wires at an angle with respect to a corresponding plug contact.
Another aspect relates to a method of terminating a cable using a modular plug. The method comprising positioning twisted pairs of wires from the cable through one or more channels defined by a wire manager of the modular plug; untwisting the twisted pairs of wires; positioning the wires on a wire sled of the modular plug, the wire sled defining a plurality of grooves for positioning each individual wire at an angle with respect to a plug contact; trimming the wires to be flush with a distal end of the wire sled; inserting the wire manager and wire sled into a housing of the modular plug; and crimping the plug contacts to contact the individual wires positioned by the wire sled.
Another aspect relates to a modular plug for terminating a telecommunications cable having twisted pairs of wires. The modular plug comprising a housing defining an internal cavity and slots positioned toward a distal end, each slot being parallel to a central axis of the modular plug; a wire manager fitted inside the internal cavity, the wire manager defining channels for positioning the twisted pairs of wires inside the housing; a wire sled extending from the wire manager, the wire sled defining a plurality of grooves, each groove shaped to position an individual wire from the twisted pairs of wires at an angle with respect to the central axis; and a plurality of plug contacts, each plug contact held by a slot on the distal end of the housing, and structured to form an electrical interface with a wire positioned by the wire sled.
A variety of additional inventive aspects will be set forth in the description that follows. The inventive aspects can relate to individual features and to combinations of features. It is to be understood that both the forgoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the broad inventive concepts upon which the examples disclosed herein are based.
DESCRIPTION OF THE FIGURES
The following drawing figures, which form a part of this application, are illustrative of described technology and are not meant to limit the scope of the disclosure in any manner.
Various embodiments will be described in detail with reference to the drawings, wherein like reference numerals represent like parts and assemblies throughout the several views. Reference to various embodiments does not limit the scope of the claims attached hereto. Additionally, any examples set forth in this specification are not intended to be limiting and merely set forth some of the many possible embodiments for the appended claims.
As shown in
The housing 200 includes an array of slots 210 along a distal end of the housing. As shown in
The wire sled 500 includes a plurality of grooves 502 to align each individual wire from the telecommunications cable 10 with a plug contact 110. As will be described in more detail, each groove 502 is structured to position an individual wire from the twisted pairs of wires in the telecommunications cable 10 at an angle with respect to a corresponding plug contact 110. In one embodiment, the wire sled 500 includes ribs 508 on opposite sides. The ribs 508 are structured to create an interference with the housing 200 to ensure that the wire sled 500 is centered inside the internal cavity of the housing 200. In the example embodiment shown in the figures, there are eight plug contacts, eight slots, and eight grooves. Accordingly, the modular plug 100 may correspond to an RJ-45 jack. However, other configurations are also possible.
The housing 200 further includes a latching handle 206 and shoulders 208. The latching handle 206 and shoulders 208 are configured to engage a corresponding structure in a receptacle of a telecommunications jack to secure the modular plug 100 in the telecommunications jack.
The rear component 400 has an arm 404 that extends therefrom. The arm 404 can include a depression 402 that receives a distal end of the latching handle 206 of the housing 200. The arm 404 functions to prevent the latching handle 206 from snagging or being snagged.
The arm 404 can also function as an actuator for the latching handle 206 that transmits a pressure asserted onto the arm 404 to actuate the latching handle 206 to insert or remove the modular plug 100 from a jack. Thus, the difficulty of actuating the latching handle 206 due to the relatively small size of the modular plug 100 is reduced or eliminated by the arm 404.
The rear component 400 further includes latching members 406. Each latching member 406 engages a corresponding edge 302 on the wire manager 300. Accordingly, the rear component 400 is configured to snap-fit onto the wire manager 300.
The hood 600 has latching members 602. Each latching member 602 engages a corresponding edge 304 on the wire manager 300. Accordingly, the hood 600 is configured to snap-fit onto the wire manager 300. In alternative embodiments, the hood 600 is integral with the wire manager 300 such that the hood 600 is not a separate component.
The housing 200 includes slots 204 on opposite sides of the housing. Each slot 204 receives a corresponding tab 408 of the rear component 400. Thus, the housing 200 is configured to house and secure the wire manager 300 with the hood 600 and rear component 400 attached thereto when inserted inside the housing 200.
The wire manager 300 has internal walls 306 that define the central channel 308 and outer walls 310 that define with the internal walls 306 the lateral channels 312. The internal and outer walls 306, 310 are flexible to accommodate the pairs of twisted wires. While the example embodiments depicted in the drawings show the outer walls 310 as part of the wire sled 500, in alternative embodiments the outer walls 310 can be part of the wire manager 300 without being a part of the wire sled 500. Additionally, while the example embodiments depicted in the figures show the wire sled 500 as integral with the wire manager 300, in alternative embodiments the wire sled 500 can be a separate component that attaches to the wire manager 300.
The internal walls 306 include opposing edges 314 that together define a gate 316 (see
The gate 316 is structured to position pairs of twisted wires such that the pairs of twisted wires are only able to pass through the gate 316 in a stacked arrangement. Advantageously, the gate 316 maintains the twist and spacing between the pairs of twisted wires before the wires reach the wire sled 500. By maintaining the twist and spacing, the wire manager 300 substantially reduces variability in crosstalk between the wires inside the modular plug 100, and thus substantially improves the performance of the modular plug 100. Additionally, the gate 316 holds the pairs of twisted wires making it easier for a technician to untwist the wires.
A first pair of twisted wires can be pushed beyond the tabs 318 and into the lower portion 322 of the gate 316. The internal walls 306 are structured to flex in opposite directions to allow the first pair of twisted wires to be pressed beyond the tabs 318 and into the lower portion 322.
As shown in
A second pair of twisted wires is positioned in the upper portion 320 of the gate 316. As shown in
The wire manager 300 further includes opposing edges 330 between the internal walls 306 and outer walls 310 that define a gate 332 in each lateral channel 312. The internal walls 306 curve in opposite directions towards the outer walls 310 to at least partially define the gates 332 in the lateral channels 312. The gates 332 in the lateral channels 312 are offset with respect to the gate 316 in the central channel 308 on the central axis AA of the modular plug 100. For example, the gates 332 are in closer proximity to the wire sled 500 than the gate 316. The gates 332 in the lateral channels 312 each position a third and a fourth pair of twisted wires.
The gates 332 decrease the width of the lateral channels 312. The gates 332 position the third and fourth pairs of twisted wires such that the wires are only able to pass through the gates 332 in a stacked arrangement. The gates 332 maintain the twist and spacing of the third and fourth pairs of twisted wires before the wires reach the wire sled 500 to substantially reduce variability in crosstalk between the wires inside the modular plug 100, and thus substantially improves the performance of the modular plug 100. Additionally, the gates 332 hold the third and fourth pairs of twisted wires making it easier for a technician to untwist the wires.
A rear portion 340 of the wire manager 300 includes a flange 346 that abuts a rear portion of the housing 200 when the wire manager 300 is inserted inside the housing 200. The rear portion 340 defines an interior surface 342 that partially fits around the jacket of the telecommunications cable 10. The interior surface 342 can have a concave shape that fits around a circular outer jacket of the cable, or may have other shapes to accommodate differently shaped cables. The interior surface 342 includes ridges 344 each having a sloped surface. The ridges 344 are configured to grip the outer protective jacket of the telecommunications cable 10 when the rear component 400 is at least partially attached to the wire manager 300.
Referring now to
Each groove 502 is exposed (e.g., uncovered) on the wire sled 500 to enable a crimping tool to crimp the plug contacts 110 into the individual wires positioned by the grooves 502. Once the plug contacts 110 and individual wires are crimped together, an electrical interface is created and maintained between the individual wires and the plug contacts 110 such that the plug contacts 110 can electrically connect the individual wires to the corresponding contacts of a jack.
Advantageously, positioning the individual wires at an angle with respect to the plug contacts 110 improves the crimping between the plug contacts 110 and the individual wires because the angle facilitates the ability to crimp the tines of each plug contact 110 on opposite sides of each individual wire so that they straddle the wire to form a more reliable connection.
While the example embodiments illustrated in the figures show the grooves 502 angled toward a right side of the wire sled 500 (see, for example,
The body 112 of the plug contact 110 further includes first and second tines 120, 122 that each have a sloped surface 124, 126. As shown in the figures, the first and second tines 120, 122 are offset with respect to a central axis BB of the plug contact such at a terminal end 123 of the first tine 120 is one side of the central axis BB, while the terminal end 125 of the second tine 122 is on an opposite side of the central axis BB. The sloped surfaces 124, 126 diverge in opposite directions with respect to the central axis BB in a scissor-like manner. The offset between the first and second tines 120, 122 of each plug contact 110 is small because the plug contacts 110 are slotted close together inside the slots 210 to be aligned with the contacts of a jack.
A reliable connection requires that the first and second tines 120, 122 fall on opposite sides of the individual wire 12 so that the electrical interface between the plug contact 110 and the individual wire 12 is secure and stable. Referring now to
Referring back to
In one embodiment, each groove 502 on the wire sled 500 has a first portion 504 and a second portion 506. The first portion 504 of each groove 502 is located toward a proximal end of the wire sled 500 and is substantially parallel to the central axis AA of the modular plug 100 to provide a smooth transition for the individual wires from the wire manager 300 to the grooves 502 of the wire sled 500. The second portion 506 of each groove 502 transitions from the first portion 504, and extends toward a distal end of the wire sled 500. The second portion 506 of each groove 502 is angled with respect to the central axis AA of the modular plug 100 to align each individual wire at an angle with respect to a plug contact 110 held by the housing 200.
The grooves 502 have a cross-sectional profile shape along a plane perpendicular to the central axis AA. The cross-sectional profile shape allows the grooves 502 to engage the exterior surface of the individual wires to help position the individual wires at an angle with respect to the plug contacts 110. In some embodiments, the cross-sectional profile shape is semi-circular. Additional cross-sectional profile shapes are possible.
In certain embodiments, the grooves 502 on the wire sled 500 are angled at an angle of about 2 degrees to about 10 degrees with respect to the central axis AA of the modular plug 100. In certain embodiments, the grooves 502 on the wire sled 500 are angled at an angle of about 3 degrees to about 8 degrees with respect to the central axis AA of the modular plug 100. In one embodiment, the grooves 502 on the wire sled 500 are angled at an angle of about 4.4 degrees with respect to the central axis AA of the modular plug 100. In some embodiments, the grooves 502 each have a length of about 0.12 inches to about 0.18 inches. In some embodiments, the grooves 502 each have a diameter of about 0.030 inches to about 0.045 inches.
Next, the method 700 includes an operation 706 of untwisting the twisted pairs of wires, and an operation 708 of positioning the wires onto the wire sled 500. As described above, the wire sled 500 defines a plurality of grooves 502 for positioning each individual wire at an angle with respect to a plug contact 110 held by the housing 200. In certain embodiments, operation 708 includes using the grooves 502 of the wire sled 500 to position the wires at an angle of about 2 degrees to about 10 degrees with respect to the plug contacts 110. In certain embodiments, operation 708 includes using the grooves 502 of the wire sled 500 to position the wires at an angle of about 3 degrees to about 8 degrees with respect to the plug contacts. In one embodiment, operation 708 includes using the grooves 502 of the wire sled 500 to position the wires at an angle of about 4.4 degrees with respect to the plug contacts.
The method 700 includes an operation 710 of trimming the wires to be flush with a distal end of the wire sled 500, followed by an operation 712 of inserting the wire manager 300 and wire sled 500 into the housing 200. As described above, the rear component 400 attaches to the wire manager 300 and includes tabs 408 that snap-fit into the slots 204 of the housing 200 to secure the wire manager 300 and rear component 400 inside the housing 200. In one embodiment, operation 712 includes using the ribs 508 of the wire sled 500 to create an interference with the housing 200 and thereby ensure that the wire sled 500 is centered inside the housing 200. Thereafter, the method 700 includes an operation 714 of crimping the plug contacts 110 held by the housing 200 to contact the individual wires positioned by the wire sled 500.
The various embodiments described above are provided by way of illustration only and should not be construed to limit the claims attached hereto. Those skilled in the art will readily recognize various modifications and changes that may be made without following the example embodiments and application illustrated and described herein, and without departing from the true spirit and scope of the following claims.
This application is being filed on Apr. 30, 2021 as a PCT International Patent Application and claims the benefit of U.S. Patent Application Ser. No. 63/017,706, filed on Apr. 30, 2020, the disclosure of which is incorporated herein by reference in its entirety.
Filing Document | Filing Date | Country | Kind |
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PCT/US2021/030232 | 4/30/2021 | WO |
Number | Date | Country | |
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63017706 | Apr 2020 | US |