The present invention relates to cable modems and cable TV set-top boxes at subscriber locations. More particularly, the present invention relates to devices and methods to dissipate and/or eliminate noise on an outer conductor of a port of the F-type, so as to reduce and/or eliminate common mode noise on a center conductor of the F-type port and any coaxial cable attached thereto.
Devices within a subscriber's premises, such as a cable modem box and cable television (CATV) set-top box, can generate radio frequency (RF) noise. Often the RF noise is coupled to the metal frame or housing of the box. The outer conductor of the device's RF input/output port, e.g., a female F-type port, is typically mounted directly to the metal frame or housing. Hence, the noise signal is present on the outer conductor of the F-type port.
The service provider signal is typically brought to the box by a coaxial cable terminated to male coaxial connector of the F-type. When the F-type connector is properly connected to the F-type port of the box, the RF noise, present on the outer conductor of the F-type port, transmits directly to the outer conductor of the coaxial cable terminated by the F-type connector. The RF noise does not degrade or interfere with Internet or CATV service signals carried on the center conductor of the coaxial cable, but rather gets carried along the outer conductor.
Sometimes, the F-type connector can have its center conductor engaged to the center conductor of the mating port, but the outer conductor of the F-type connector is not tightly coupled to the outer conductor of the F-type port. If the connection is sufficiently loose, such that contact between the outer conductors of the connector and port is lost, the noise signal on the outer conductor can transfer to the center conductor through a process called common mode coupling.
The loose connection may occur at the port of the modem box or CATV set-top box. However, there are many other points at which the common mode coupling can occur. For example, the cable connected to the customer's box, typically runs only a few feet to a wall plate with a female coaxial port and that connection may be loose. A first segment of cable runs from the backside of wall plate to a splitter, e.g., in the attic, a second segment of cable runs from the splitter to an amplifier, e.g., in the basement, a third segment of cable runs from the amplifier to a ground block on an outside wall of the subscriber's premises. Also, there are multiple cable segments that run from the amplifier and/or splitter to other wall outlets and other RF devices. Hence, if noise is traveling on the outer conductor of the coaxial cable and it encounters any loose couplings along the various segments/paths, common mode coupling can occur, and noise can jump from the outer conductor to the center conductor of the coaxial cable.
After common mode coupling, the noise signal will travel on the center conductor of the cable. If the noise is in the frequency band of the operational frequencies used in the network, or has a harmonic in that frequency band, the noise can interfere with and degrade the quality of, and thus performance of, the provided services, e.g., Internet, phone, entertainment programming.
This problem could be addressed with a re-design of the customer's modem box or CATV set-top box. For example, general noise suppression circuitry could be added within the box and/or of the RF input port could be isolated from the noise sources. Some newer customer boxes have employed these measures to deal with the noise issues. However, a significant number of older boxes are still in deployment, e.g., perhaps more than thirty million boxes, and it is too expensive to do a large scale change out of potentially problematic boxes, which produce noise on the outer conductor of the RF port. What is needed is a solution that can be applied to the currently deployed customer boxes in a manner that does not require entry into the housings of customer boxes. Entry into the housing and making modifications to internal circuitry would be so time consuming that it would probably be more economical to replace the customer boxes.
It is an object of the present invention to address the drawbacks of the background art, as noted above. The Applicant has invented solutions to the problem of common mode coupling of noise from the outer conductor of the F-type port to the center conductor of the F-type port and/or a center conductor of a coaxial cable attached to the F-type port.
These and other objects are accomplished by an apparatus comprising: a power cord including: three insulated electrical conductors within a jacket; a male outlet plug having two blades and a ground pin for mating to a standard 110 volt AC outlet receptacle, disposed at a first end of said power cord; a power plug having first and second electrical leads electrically connected to first and second insulated electrical conductors of said three insulated electrical conductors within said jacket, respectively, said power plug being disposed at a second end of said power cord and adapted to provide alternating current (AC) power to a power port of a radio frequency (RF) device; an electrically conductive connector having a shape and size to fit around a base of a F-type female coaxial port and make electrical contact with the outer conductor of the F-type female coaxial port; and a jumper wire, wherein said electrically conductive connector is electrically connected to a first end of said jumper wire, wherein a second end of said jumper wire is electrically connected to a third insulated electrical conductor of said three insulated electrical conductors within said jacket, and wherein said third insulated electrical conductor is electrically connected to said ground pin of said male outlet plug.
Moreover, these and other objects are accomplished by an apparatus comprising: a coaxial cable segment including: an inner conductor; a dielectric layer surrounding said inner conductor; an outer conductor surrounding said dielectric layer; a jacket surrounding said outer conductor; and a male F-type coaxial connector attached to a first end of said coaxial cable segment; an electrically conductive connector having a shape and size to fit around a base of a F-type female coaxial port and make electrical contact with the outer conductor of the F-type female coaxial port; and a jumper wire, wherein said electrically conductive connector is electrically connected to a first end of said jumper wire, and wherein another portion of said jumper wire is in electrical contact with said outer conductor of said coaxial cable segment.
Further still, these and other objects are accomplished by an apparatus comprising: a coaxial cable segment including: an inner conductor; a dielectric layer surrounding said inner conductor; an outer conductor surrounding said dielectric layer; a jacket surrounding said outer conductor; a male F-type coaxial connector attached to a first end of said coaxial cable segment; one or more ferrite members mounted to a portion of said coaxial cable segment; and an electrically conductive connector having a shape and size to fit around a base of a F-type female coaxial port and make electrical contact with the outer conductor of the F-type female coaxial port; and a jumper wire, wherein said electrically conductive connector is electrically connected to a first end of said jumper wire, and wherein a second end of said jumper wire is routed to electrically interact with said one or more ferrite members so as to dissipate any radio frequency noise to said one or more ferrite members.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus, are not limits of the present invention, and wherein:
The present invention now is described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Like numbers refer to like elements throughout. In the figures, the thickness of certain lines, layers, components, elements or features may be exaggerated for clarity. Broken lines illustrate optional features or operations unless specified otherwise.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the specification and relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein. Well- known functions or constructions may not be described in detail for brevity and/or clarity.
As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. As used herein, phrases such as “between X and Y” and “between about X and Y” should be interpreted to include X and Y. As used herein, phrases such as “between about X and Y” mean “between about X and about Y.” As used herein, phrases such as “from about X to Y” mean “from about X to about Y.”
It will be understood that when an element is referred to as being “on”, “attached” to, “connected” to, “coupled” with, “contacting”, etc., another element, it can be directly on, attached to, connected to, coupled with or contacting the other element or intervening elements may also be present. In contrast, when an element is referred to as being, for example, “directly on”, “directly attached” to, “directly connected” to, “directly coupled” with or “directly contacting” another element, there are no intervening elements present. It will also be appreciated by those of skill in the art that references to a structure or feature that is disposed “adjacent” another feature may have portions that overlap or underlie the adjacent feature.
Spatially relative terms, such as “under”, “below”, “lower”, “over”, “upper”, “lateral”, “left”, “right” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, elements described as “under” or “beneath” other elements or features would then be oriented “over” the other elements or features. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the descriptors of relative spatial relationships used herein interpreted accordingly.
A power plug 115 is disposed at a second end 121 of the power cord 101. The power plug 115 has first and second electrical leads 117 and 119 electrically connected to the first and second insulated electrical conductors A and B, respectively. The power plug 115 is adapted to provide alternating current (AC) power to a power port 123 of a radio frequency (RF) device.
In a first embodiment as depicted in
In a second embodiment as depicted in
In the first embodiment of
In the second embodiment of
The barrel-type plug 141 of
In both of the first and second embodiments, the cable modem box 125 or the CATV set-top box 131 includes a F-type female coaxial port 145. Also, in both of the first and second embodiments, an electrically conductive connector 147 has a shape and size to fit around a base of the F-type female coaxial port 145 and make electrical contact with an outer conductor of the F-type female coaxial port 145.
A jumper wire 149 is electrically connected to the electrically conductive connector 147. More specifically, a first end 151 of the jumper wire 149 is connected to the electrically conductive connector 147 and a second end 153 of the jumper wire 149 is electrically connected to the third insulated electrical conductor C of the three insulated electrical conductors A, B and C within the jacket 103. As previously mentioned, the third insulated electrical conductor C is electrically connected to the ground pin 111 of the male outlet plug 105. The jumper wire 149 may having an outer insulation layer, or may be a bare wire. It may also be formed of stranded plural wires or a solid conductor.
The plurality of teeth 159 are resilient and flexible and engage with threads formed on the outer surface of the F-type female coaxial port 145. As best seen in
The coaxial cable segment 201 has an inner conductor 203. A dielectric layer 205, best seen in
The electrically conductive connector 147, having a shape and size to fit around the base of the F-type female coaxial port 145 and make electrical contact with the outer conductor of the F-type female coaxial port 145, is also provided in the third embodiment. In the third embodiment, a first end 215 of a jumper wire 213 is attached to, and in electrical contact with, the electrically conductive connector 147. Another portion of the jumper wire 213 is in electrical contact with the outer conductor 207A and 207B of the coaxial cable segment 201.
As best seen in
As shown in
In
As best seen in
The second end 225 of the jumper wire 213A passes into the boot 231 and is electrically connected to the body 229 of the first male F-type coaxial connector 211. In other words, the jumper wire 213A is placed into electrical contact with the outer conductor 207A and 207B of the coaxial cable segment 201A by a direct connection to the first male F-type coaxial connector 211, and/or may also directly contact the outer conductor 207A and 207B of the coaxial cable segment 201A, within the first male F-type coaxial connector 211, as also shown in
In
In the embodiment of
Instead of relying upon the one or more ferrite members 233, it is also within the purview of the present invention to simply couple the electrical noise from the jumper wire 213, 213A onto the outer conductor 207A and 207B and reply upon the grounding block of the customer's residence to eliminate the electrical noise being carried by the outer conductor 207A and 207B. However, the previously described embodiments of
The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are to be included within the scope of the following claims.
This application claims the benefit of U.S. Provisional Application No. 62/680,415, filed Jun. 4, 2018, which is herein incorporated by reference.
Number | Date | Country | |
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62680415 | Jun 2018 | US |