US20010033109A1 - Bypass device for amplifier - Google Patents
Bypass device for amplifier Download PDFInfo
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- US20010033109A1 US20010033109A1 US09/894,624 US89462401A US2001033109A1 US 20010033109 A1 US20010033109 A1 US 20010033109A1 US 89462401 A US89462401 A US 89462401A US 2001033109 A1 US2001033109 A1 US 2001033109A1
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- amplifier
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- 239000000758 substrate Substances 0.000 claims abstract description 37
- 238000004891 communication Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 125000006850 spacer group Chemical group 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
- H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
Definitions
- This invention relates to communication systems and electronic devices for use therein, and more specifically to distribution equipment, such as broadband network amplifiers.
- RF signals radio frequency
- video signals such as video signals
- RF signals originate from a central location commonly referred to as the “headend”.
- a broadband network distribution system such as a cable television system
- these passives must also pass RF signals (which can be referred to as “upstream” or “reverse” signals) from the home to the headend without interfering with RF signals (which can be referred to as “downstream” or “forward” signals) sent to other passives and amplifiers.
- Prior art amplifiers amplify and transmit RF signals that carry video and voice data from a central location or headend to a plurality of subscribers.
- the amplifiers can be upgraded, such as to support higher frequency signals, repaired, or replaced in the field. Doing any of these things, however, requires removal and replacement of the circuitry inside the amplifier housing, which temporarily disconnects service downstream. Such a temporary disconnection in service is often unacceptable to customers and, in two-way systems, to communication service providers as well.
- FIG. 1 is a block diagram of a communication system, such as a broadband network, including an amplifier in accordance with the present invention.
- FIG. 2 is a block diagram of an amplifier included in the communication system of FIG. 1 in accordance with the present invention.
- FIG. 3 is a top view of a bypass device included in the amplifier of FIG. 2 in accordance with the present invention.
- FIG. 4 is a bottom view of the bypass device of FIG. 3 in accordance with the present invention.
- FIG. 5 is a side view of the bypass device of FIG. 3 when the bypass device is set in an open mode in accordance with the present invention.
- FIG. 6 is a side view of the bypass device of FIG. 3 when the bypass device is set in a closed mode in accordance with the present invention.
- FIG. 7 is an exploded perspective view of the bypass device of FIG. 3 and an amplifier housing in which it can be situated in accordance with the present invention.
- FIG. 8 is a top view of the amplifier housing of FIG. 7 including the bypass device of FIG. 3 in accordance with the present invention.
- FIGS. 9 - 11 show the amplifier housing of FIG. 7 including the bypass device of FIG. 3 and an amplifier circuit in accordance with the present invention.
- the headend 105 typically receives radio frequency (RF) signals carrying the multimedia information from a satellite, cable, fiber optic networks, microwave, VHF, UHF, or other sources and transmits these signals to a subscriber home or business via a distribution network.
- the distribution network can include a fiber optic communication channel 110 for coupling the headend equipment 105 to a node 115 , which converts optical signals provided by the headend 105 to electrical signals for further distribution over one or more electrical communication channels 120 .
- Amplifiers 125 within the network 100 amplify signals in the downstream direction or, in two-way systems, in both directions. Portions of the amplified signals are split of by taps 130 , which route signals to and from subscriber equipment 135 , such as computers, telephones, televisions, modems, and set-top decoders/encoders.
- subscriber equipment 135 such as computers, telephones, televisions, modems, and set-top decoders/encoders.
- An example amplifier 125 receives a downstream RF signal at input port 150 .
- the downstream RF signal is filtered by the highpass portion of a diplex filter 160 , then processed by forward gain stages 165 .
- the amplified downstream signal is routed through a second diplex filter 175 and provided at output port 185 .
- Upstream signals such as signals generated by subscriber equipment 135 , enter the amplifier at output port 185 and are filtered by the lowpass portion of the diplex filter 175 .
- the upstream signals are then amplified by reverse gain stages 170 , filtered by diplex filter 160 , and provided at port 150 .
- the amplifier 125 also includes a bypass device comprising at least two bypass switches 155 , 180 , one at the amplifier input and one at the amplifier output. More specifically, a first bypass switch is located between input port 150 and the conventional amplifier circuitry, which, in FIG. 2, is shown as including the diplex filter 160 as the first conventional amplifier component encountered in the downstream direction.
- a bypass switch is located between input port 150 and the conventional amplifier circuitry, which, in FIG. 2, is shown as including the diplex filter 160 as the first conventional amplifier component encountered in the downstream direction.
- the second bypass switch 180 is located between the output port 185 and the conventional amplifier circuit, i.e., on the downstream side of other signal processing circuitry. If the amplifier 125 includes additional outputs, additional bypass devices may be provided at each of these ports also.
- the first and second bypass switches 155 , 180 are, during normal operation of the amplifier 125 , in an open, or operational, position in which electrical signals pass into and out of the conventional amplifier circuitry, e.g., diplex filters 160 , 175 and gain stages 165 , 170 , via input and output ports 150 , 185 .
- the switches 155 , 180 are, according to a preferred embodiment of the present invention, mechanically activated so that insertion of an amplifier module or circuit board, cover, or other amplifier component engages the switches, which are thereby held in the operational position. Removal of the engaging device, such as an amplifier module, circuit board, cover, or other component, releases a switch member such that the switches 155 , 180 operate in a closed, or bypass, position in which conventional amplifier circuitry is bypassed.
- FIGS. 3 - 6 illustrate the mechanical features and operation of each of the bypass switches 155 , 180 .
- the bypass switch as shown in the top view of FIG. 3, includes a substrate 205 , comprising a material suitable for mechanically supporting various devices, on which is mounted a primary terminal 215 through which signals enter and/or exit the amplifier 125 via either port 150 or port 185 , depending upon the switch location (upstream or downstream) within the amplifier 125 .
- An amplifier terminal 220 couples signals from the primary terminal 215 to and from the amplifier circuitry when the switch is in its operational position, and signals are routed to and from a bypass terminal 235 when the switch is in its bypass position.
- the primary terminal 215 is located on a bottom surface of the substrate 205 and is accessible from the top surface thereof through an opening 210 in the substrate 205 , and the amplifier and bypass terminals 220 , 235 are formed on the top surface.
- An actuator 225 for moving the switch between its operational and bypass positions extends through the substrate 205 via aperture 230 so that downwards and upwards forces exerted on the actuator 225 actuate the switch.
- an electrically nonconductive spacer 245 is coupled to the bottom surface of the substrate 205 , which can, for example, be formed from a conductive material.
- an electrically conductive primary element 250 is formed or mounted to electrically couple the primary terminal 215 to the amplifier terminal 220 .
- the primary element 250 is preferably fixed in position.
- An electrically conductive bypass element 255 is coupled to the bypass terminal 235 and is vertically aligned with the amplifier terminal 220 .
- FIG. 5 a side view of the switch in its operational mode is depicted.
- the amplifier and bypass terminals 220 , 235 are formed on the top substrate surface.
- the amplifier terminal 220 extends through the substrate 205 and through the spacer 245 to electrically contact and mechanically secure the primary element 250 at a first end.
- the opposite end of the primary element 250 is electrically coupled to the primary terminal 215 via a fastener 215 formed on the bottom surface of the substrate 205 .
- the bypass terminal 235 extends through the substrate 205 , via aperture 240 , and through the spacer 245 to electrically and mechanically couple to the bypass element 255 at a first of its ends.
- the electrical and mechanical connection between the bypass element 255 and the bypass terminal 235 can be formed, for example, by use of a rivet 238 or other electrically conductive securing mechanism.
- the switch actuator 225 is formed from an electrically insulative material, such as plastic, and extends through the substrate 205 and the spacer 245 . It can be fastened, such as by a rivet 260 , to the bypass element 255 , or it can simply be configured to contact and exert force upon the bypass element 255 as necessary. According to the present invention, a force exerted downwards upon an actuating surface 290 of the actuator 225 causes the bypass element 255 to flex away from the primary element 250 in a vertical direction, thereby electrically decoupling the two elements 250 , 255 to place the switch in its operational position. In this position, signals travel between the primary terminal 215 and the amplifier terminal 220 , with no connections to or from the bypass terminal 235 .
- bypass element 255 As shown in FIG. 6, removal of the downward force on the actuator 225 causes the bypass element 255 to spring upwards towards the substrate 205 . This results in electrical and mechanical contact between the bypass element 255 and the primary element 250 at a location approximately beneath the amplifier terminal 220 . In this bypass position, the switch electrically couples the primary terminal 215 to the bypass terminal 235 .
- bypass element 255 should be flexible enough so that the downward force on the actuator 225 causes the bypass element 255 to flex and decouple from the primary element 250 , yet rigid enough to spring back into contact with the primary element 250 upon removal of the force from the actuator 225 .
- the bypass switch 155 is inserted into a housing 305 of the amplifier 125 and preferably positioned so that the bypass and primary elements 255 , 250 are insulated, mechanically and electrically, from contact with other amplifier elements.
- a first bypass switch 155 should be employed at an upstream location within the amplifier 125
- a second bypass switch 180 should be employed at a downstream location within the amplifier 125 , as shown in FIG. 2 and explained in reference thereto.
- FIGS. 9 - 11 illustrate the use of the bypass switch 155 in conjunction with other amplifier components.
- an amplifier module or circuit board 310 housing the remainder of the amplifier circuitry is inserted into the housing 305 .
- a portion of the amplifier module 310 mechanically contacts the actuation surface 290 (FIG. 5) of the actuator 225 of each bypass switch so that insertion of the module 310 pushes the actuator 225 down, thereby placing each switch in its operational mode.
- the switches electrically couple the amplifier module 310 to the input and output ports 150 , 185 (FIG. 2) of the amplifier 125 .
- the bypass terminal 235 of each switch is accessible even when the amplifier module 310 is positioned within the housing 305 .
- bypass device comprising at least one switch 155 , 180
- the bypass switches of the above-described bypass device could be included at an input and an output of a headend device, a node, a hub, another type of amplifier, or a tap.
- bypass switches could be used to bypass circuit modules or components located within any of the above types of electronic devices.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
Description
- This invention relates to communication systems and electronic devices for use therein, and more specifically to distribution equipment, such as broadband network amplifiers.
- When distributing radio frequency (RF) signals, such as video signals, over broadband networks, it is common practice to transmit RF signals over a coaxial cable through an amplifier to a plurality of passive devices. These RF signals originate from a central location commonly referred to as the “headend”. Passives tap off the RF signal from a broadband network distribution system, such as a cable television system, and feed the tapped-off RF signal to various subscriber equipment. With the advent of interactive television, these passives must also pass RF signals (which can be referred to as “upstream” or “reverse” signals) from the home to the headend without interfering with RF signals (which can be referred to as “downstream” or “forward” signals) sent to other passives and amplifiers.
- Prior art amplifiers amplify and transmit RF signals that carry video and voice data from a central location or headend to a plurality of subscribers. The amplifiers can be upgraded, such as to support higher frequency signals, repaired, or replaced in the field. Doing any of these things, however, requires removal and replacement of the circuitry inside the amplifier housing, which temporarily disconnects service downstream. Such a temporary disconnection in service is often unacceptable to customers and, in two-way systems, to communication service providers as well.
- FIG. 1 is a block diagram of a communication system, such as a broadband network, including an amplifier in accordance with the present invention.
- FIG. 2 is a block diagram of an amplifier included in the communication system of FIG. 1 in accordance with the present invention.
- FIG. 3 is a top view of a bypass device included in the amplifier of FIG. 2 in accordance with the present invention.
- FIG. 4 is a bottom view of the bypass device of FIG. 3 in accordance with the present invention.
- FIG. 5 is a side view of the bypass device of FIG. 3 when the bypass device is set in an open mode in accordance with the present invention.
- FIG. 6 is a side view of the bypass device of FIG. 3 when the bypass device is set in a closed mode in accordance with the present invention.
- FIG. 7 is an exploded perspective view of the bypass device of FIG. 3 and an amplifier housing in which it can be situated in accordance with the present invention.
- FIG. 8 is a top view of the amplifier housing of FIG. 7 including the bypass device of FIG. 3 in accordance with the present invention.
- FIGS.9-11 show the amplifier housing of FIG. 7 including the bypass device of FIG. 3 and an amplifier circuit in accordance with the present invention.
- Referring to FIG. 1, there is shown a
system 100 for distributing data, sound, and video, generally referred to as multimedia information, from aheadend unit 105 tosubscriber equipment 135. Theheadend 105 typically receives radio frequency (RF) signals carrying the multimedia information from a satellite, cable, fiber optic networks, microwave, VHF, UHF, or other sources and transmits these signals to a subscriber home or business via a distribution network. The distribution network can include a fiberoptic communication channel 110 for coupling theheadend equipment 105 to anode 115, which converts optical signals provided by theheadend 105 to electrical signals for further distribution over one or moreelectrical communication channels 120.Amplifiers 125 within thenetwork 100 amplify signals in the downstream direction or, in two-way systems, in both directions. Portions of the amplified signals are split of bytaps 130, which route signals to and fromsubscriber equipment 135, such as computers, telephones, televisions, modems, and set-top decoders/encoders. - An
example amplifier 125, shown in more detail in FIG. 2, receives a downstream RF signal atinput port 150. In a two-way broadband network 100, the downstream RF signal is filtered by the highpass portion of adiplex filter 160, then processed byforward gain stages 165. The amplified downstream signal is routed through asecond diplex filter 175 and provided atoutput port 185. Upstream signals, such as signals generated bysubscriber equipment 135, enter the amplifier atoutput port 185 and are filtered by the lowpass portion of thediplex filter 175. The upstream signals are then amplified byreverse gain stages 170, filtered bydiplex filter 160, and provided atport 150. - According to the present invention, the
amplifier 125 also includes a bypass device comprising at least twobypass switches input port 150 and the conventional amplifier circuitry, which, in FIG. 2, is shown as including thediplex filter 160 as the first conventional amplifier component encountered in the downstream direction. One of ordinary skill in the art will understand, however, that other types of circuits, such as AC bypass circuits, could precede thediplex filter 160, and that thediplex filter 160 could be omitted entirely in one-way systems. What is important is that thebypass switch 155 be farther upstream in theamplifier 125 than other signal processing circuitry. Thesecond bypass switch 180 is located between theoutput port 185 and the conventional amplifier circuit, i.e., on the downstream side of other signal processing circuitry. If theamplifier 125 includes additional outputs, additional bypass devices may be provided at each of these ports also. - The first and
second bypass switches amplifier 125, in an open, or operational, position in which electrical signals pass into and out of the conventional amplifier circuitry, e.g.,diplex filters gain stages output ports switches switches - FIGS.3-6 illustrate the mechanical features and operation of each of the
bypass switches substrate 205, comprising a material suitable for mechanically supporting various devices, on which is mounted aprimary terminal 215 through which signals enter and/or exit theamplifier 125 via eitherport 150 orport 185, depending upon the switch location (upstream or downstream) within theamplifier 125. Anamplifier terminal 220 couples signals from theprimary terminal 215 to and from the amplifier circuitry when the switch is in its operational position, and signals are routed to and from abypass terminal 235 when the switch is in its bypass position. - According to an example switch that was manufactured and tested, the
primary terminal 215 is located on a bottom surface of thesubstrate 205 and is accessible from the top surface thereof through anopening 210 in thesubstrate 205, and the amplifier andbypass terminals actuator 225 for moving the switch between its operational and bypass positions extends through thesubstrate 205 viaaperture 230 so that downwards and upwards forces exerted on theactuator 225 actuate the switch. - As can be seen in FIG. 4, which shows a bottom view of the switch, an electrically
nonconductive spacer 245 is coupled to the bottom surface of thesubstrate 205, which can, for example, be formed from a conductive material. On thespacer 245, an electrically conductiveprimary element 250 is formed or mounted to electrically couple theprimary terminal 215 to theamplifier terminal 220. Theprimary element 250 is preferably fixed in position. An electricallyconductive bypass element 255 is coupled to thebypass terminal 235 and is vertically aligned with theamplifier terminal 220. - Referring next to FIG. 5, a side view of the switch in its operational mode is depicted. As mentioned, the amplifier and
bypass terminals amplifier terminal 220 extends through thesubstrate 205 and through thespacer 245 to electrically contact and mechanically secure theprimary element 250 at a first end. The opposite end of theprimary element 250 is electrically coupled to theprimary terminal 215 via afastener 215 formed on the bottom surface of thesubstrate 205. - The
bypass terminal 235 extends through thesubstrate 205, viaaperture 240, and through thespacer 245 to electrically and mechanically couple to thebypass element 255 at a first of its ends. The electrical and mechanical connection between thebypass element 255 and thebypass terminal 235 can be formed, for example, by use of arivet 238 or other electrically conductive securing mechanism. - The
switch actuator 225 is formed from an electrically insulative material, such as plastic, and extends through thesubstrate 205 and thespacer 245. It can be fastened, such as by arivet 260, to thebypass element 255, or it can simply be configured to contact and exert force upon thebypass element 255 as necessary. According to the present invention, a force exerted downwards upon anactuating surface 290 of theactuator 225 causes thebypass element 255 to flex away from theprimary element 250 in a vertical direction, thereby electrically decoupling the twoelements primary terminal 215 and theamplifier terminal 220, with no connections to or from thebypass terminal 235. - As shown in FIG. 6, removal of the downward force on the
actuator 225 causes thebypass element 255 to spring upwards towards thesubstrate 205. This results in electrical and mechanical contact between thebypass element 255 and theprimary element 250 at a location approximately beneath theamplifier terminal 220. In this bypass position, the switch electrically couples theprimary terminal 215 to thebypass terminal 235. - It will be understood by one of ordinary skill in the art that the
bypass element 255 should be flexible enough so that the downward force on theactuator 225 causes thebypass element 255 to flex and decouple from theprimary element 250, yet rigid enough to spring back into contact with theprimary element 250 upon removal of the force from theactuator 225. - As shown in FIGS. 7 and 8, the
bypass switch 155 is inserted into ahousing 305 of theamplifier 125 and preferably positioned so that the bypass andprimary elements bypass switch 155 is depicted for illustrative purposes, it will be appreciated that afirst bypass switch 155 should be employed at an upstream location within theamplifier 125, and asecond bypass switch 180 should be employed at a downstream location within theamplifier 125, as shown in FIG. 2 and explained in reference thereto. - FIGS.9-11 illustrate the use of the
bypass switch 155 in conjunction with other amplifier components. After all bypass switches 155, 180 are inserted into thehousing 305, an amplifier module orcircuit board 310 housing the remainder of the amplifier circuitry is inserted into thehousing 305. According to the present invention, a portion of theamplifier module 310 mechanically contacts the actuation surface 290 (FIG. 5) of theactuator 225 of each bypass switch so that insertion of themodule 310 pushes theactuator 225 down, thereby placing each switch in its operational mode. In this mode, the switches electrically couple theamplifier module 310 to the input andoutput ports 150, 185 (FIG. 2) of theamplifier 125. Preferably, thebypass terminal 235 of each switch is accessible even when theamplifier module 310 is positioned within thehousing 305. - When the amplifier circuitry is to be repaired or replaced, replacement circuitry (not shown) can be coupled to the
bypass terminal 235 of each bypass switch. Once this is accomplished, theamplifier module 310, which exerts the downward forces on theswitch actuators 225, need only be removed from theamplifier housing 305 to instantaneously decouple the amplifier circuitry from the input andoutput ports same ports amplifier 125 can be performed easily and without service interruptions in thebroadband network 100. - Although the above bypass device, comprising at least one
switch - While the principles of the invention have been made clear in the illustrated embodiments, it will be obvious to those skilled in the art that many modifications can be made to the arrangements, proportions, elements, materials, and components used in the practice of the invention without departing from those principles. The appended claims are therefore intended to cover and embrace any such modifications.
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/894,624 US6455788B2 (en) | 1999-06-14 | 2001-06-28 | Bypass device for amplifier |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/332,778 US6294846B1 (en) | 1999-06-14 | 1999-06-14 | Bypass device for amplifier |
US09/894,624 US6455788B2 (en) | 1999-06-14 | 2001-06-28 | Bypass device for amplifier |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/332,778 Continuation US6294846B1 (en) | 1999-06-14 | 1999-06-14 | Bypass device for amplifier |
Publications (2)
Publication Number | Publication Date |
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US20010033109A1 true US20010033109A1 (en) | 2001-10-25 |
US6455788B2 US6455788B2 (en) | 2002-09-24 |
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US09/332,778 Expired - Lifetime US6294846B1 (en) | 1999-06-14 | 1999-06-14 | Bypass device for amplifier |
US09/894,624 Expired - Lifetime US6455788B2 (en) | 1999-06-14 | 2001-06-28 | Bypass device for amplifier |
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US09/332,778 Expired - Lifetime US6294846B1 (en) | 1999-06-14 | 1999-06-14 | Bypass device for amplifier |
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Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US6294846B1 (en) * | 1999-06-14 | 2001-09-25 | Scientific-Atlanta, Inc. | Bypass device for amplifier |
WO2003019946A1 (en) * | 2001-08-24 | 2003-03-06 | Passover, Inc. | Cable tv network frequency range extension with passive bypass device |
WO2007044595A2 (en) * | 2005-10-07 | 2007-04-19 | University Of Rochester | Distributed amplifier with built-in filtering functions |
US7807935B2 (en) * | 2006-11-03 | 2010-10-05 | Antronix, Inc. | High-frequency uninterruptible signal and power bypass |
TWM498412U (en) * | 2014-10-15 | 2015-04-01 | Zinwell Corp | Uninterruptible video splitter |
US11233366B2 (en) * | 2020-03-04 | 2022-01-25 | Holland Electronics, Llc | Uninterruptable tap |
US11611181B2 (en) * | 2020-03-04 | 2023-03-21 | Holland Electronics, Llc | Uninterruptable tap |
Family Cites Families (24)
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US3881160A (en) * | 1974-05-20 | 1975-04-29 | Joseph I Ross | Catv multi-tap distribution box |
US4622443A (en) * | 1984-07-12 | 1986-11-11 | Felten & Guilleaume Energietechnik Gmbh | Single-pole load disconnecting switch arrangement in a housing |
US5264821A (en) * | 1990-11-27 | 1993-11-23 | United Technologies Automotive | Rotary, push-pull headlight switch with ceramic coated metal substrate rheostat and cam actuated dome light bypass switch |
US5455886A (en) * | 1994-05-26 | 1995-10-03 | Ryobi Motor Products Corporation | Electrical implement with variable speed control |
JPH08181559A (en) * | 1994-12-22 | 1996-07-12 | Maspro Denkoh Corp | High frequency signal branching device |
US5648745A (en) * | 1995-03-21 | 1997-07-15 | Scientific-Atlanta, Inc. | Non-interruptible tap and method |
US5581801A (en) * | 1995-03-22 | 1996-12-03 | Scientific-Atlanta, Inc. | Apparatus for distributing RF signals and AC power to taps |
CA2147410A1 (en) * | 1995-04-20 | 1996-10-21 | Robert L. Romerein | Circuitry for use with coaxial cable distribution networks |
US5677578A (en) * | 1995-06-13 | 1997-10-14 | Tang; Danny Q. | Cable TV multi-tap with uninterruptible signal/power throughput |
US5756935A (en) * | 1995-10-06 | 1998-05-26 | Nextlevel Systems, Inc. | Screwless seizure bypass platform |
CA2160854A1 (en) * | 1995-10-18 | 1997-04-19 | Robert L. Romerein | Top exit coupler |
US6031300A (en) * | 1997-03-28 | 2000-02-29 | Bell Atlantic Networks Services, Inc. | Bridge tap remover |
US5909154A (en) * | 1997-06-02 | 1999-06-01 | Antec Corporation | Broadband signal tap with continuity bridge |
US6130703A (en) * | 1998-02-10 | 2000-10-10 | Scientific-Atlanta, Inc. | Local status monitoring of taps in a cable television system |
US6129597A (en) * | 1998-02-12 | 2000-10-10 | General Instrument Corporation | Bypass system for CATV signal tap |
JP2889562B1 (en) * | 1998-04-21 | 1999-05-10 | エスエムケイ株式会社 | Coaxial connector with switch |
US6025760A (en) * | 1998-05-01 | 2000-02-15 | Tang; Danny Q. | Tool for shunting a cable multi-tap |
US6068511A (en) * | 1998-05-12 | 2000-05-30 | Lantek Electronics Inc. | By-pass connector of cable TV multi-tap |
US5994976A (en) * | 1998-07-31 | 1999-11-30 | Tang; Danny Q. | Dual compartment multi-tap |
US6024604A (en) * | 1998-08-24 | 2000-02-15 | General Instrument Corporation | Bypass tap tool |
KR100293645B1 (en) * | 1998-09-29 | 2001-08-07 | 정진택 | Digital signal distribution jack device |
US6106311A (en) * | 1999-04-09 | 2000-08-22 | Scientific-Atlanta, Inc. | Electrical connector including spring mechanism for covering leads in open position |
US6294846B1 (en) * | 1999-06-14 | 2001-09-25 | Scientific-Atlanta, Inc. | Bypass device for amplifier |
JP2001015226A (en) * | 1999-06-30 | 2001-01-19 | Matsushita Electric Ind Co Ltd | Coaxial connector switch |
-
1999
- 1999-06-14 US US09/332,778 patent/US6294846B1/en not_active Expired - Lifetime
-
2001
- 2001-06-28 US US09/894,624 patent/US6455788B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
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US6294846B1 (en) | 2001-09-25 |
US6455788B2 (en) | 2002-09-24 |
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