Abstract: A disconnect device for suspended lines has: (1) a ground member that provides a supporting structure for mechanically grounding and/or tying the device to a supporting pole and (2) a disconnect member to which a suspended line or cable is attached that is movable or rotatable for detachment from the ground member.

Abstract: The Universal 220-240V Power Strip for 110-120V Outlet provides the ability to use 220-240V electronic devices in standard 110-120V outlets. The Universal Power Strip is the similar to a standard power strip but features multiple country plugs and two power cables which will be plugged into two different power outlets instead of one. By this method the Universal Power Strip will increase the electricity from 110-120V to 220-240V and power the 220-240V devices. Notably, residences in North America are pre-wired with a 220-240V circuit, and this device will allow full usage of the system.

Abstract: A socket having an overheating destructive limiting element includes a housing, a live wire conductive plate, a neutral wire conductive plate, at least one live wire terminal, at least one neutral wire terminal, and at least one limiting element. The live wire terminal includes a live wire contact portion in contact with the live wire conductive plate. The neutral wire terminal includes a neutral wire contact portion in contact with the neutral wire conductive plate. The limiting element is an insulating body, and is placed at contact parts of the live wire conductive plate and the live wire contact portion, and/or at contact parts of the neutral wire conductive plate and the neutral wire contact portion. When an operating temperature becomes excessively high, the limiting element becomes deformed and destructed to form a turn-off position.

Abstract: An electronic appliance powered by a power supply unit connected to a mains type electricity network, and for connection to a transmission line having two conductor elements and to a terminal in order to transfer data between the line and the terminal. The appliance has a front-end component connected to the line via an isolating transformer. Also, various additional components are connected to an electrical ground of the appliance. A discharge component is connected to the conductor elements of the line and becomes conductive in the event of a voltage surge due to a lightning strike. This eliminates the surge by establishing a flow of current from the line to electrical ground. A capacitive and/or resistive type divider component is interposed between the discharge component and electrical ground in order to co-operate with the power supply unit and/or one or more additional components to constitute a divider bridge.

Abstract: A method for heating a fiber/plastic composite material (FPC) comprising at least one layer (L) of carbon fibers (F) in a plastic matrix (P) includes inducing a magnetic field (MF) by means of a microwave antenna (MA) in the fiber/plastic composite material (FPC), and the field direction of the magnetic field (MF) runs in a plane of the layer (L) of carbon fibers (F).

Abstract: An apparatus and method for laser probing of a DUT is disclosed. The system enables laser voltage imaging state mapping of devices within the DUT. A selected area of the DUT is illuminating a while the DUT is receiving test signals causing certain of the active devices to modulate. Light reflected from the DUT is collected and is converted into an electrical signal. Phase information is extracting from the electrical signal and a two-dimensional image is generated from the phase information, wherein the two-dimensional image spatially correlates to the selected area.

Abstract: An integrated electromagnetic interference (EMI) filter circuit with electrostatic discharge (ESD) protection and incorporating capacitors is provided. At least one passive element, i.e. resistor or inductor is connected between an input terminal and an output terminal. A first capacitor is connected between ground and the input terminal, and a second capacitor is connected between ground and the output terminal. A first diode and a second diode are connected in parallel to the first capacitor and the second capacitor. One or multiple parallel capacitors are connected in parallel to the passive element and between the input terminal and the output terminal for frequency compensation by employing the novel EMI LPF circuit, it is extraordinarily advantageous of enhancing its rejection band attenuation and meanwhile maintaining high cut-off frequency while implementation.

Abstract: An apparatus includes a printed circuit board including a connector footprint comprising a first footprint portion operative to receive a first connector portion and a second footprint portion operative to receive a second connector portion. The first footprint portion is compliant with a first communications link type and the first and second footprint portions are jointly compliant with a second communications link type. The printed circuit board includes first conductive traces coupled to the first footprint portion and a first device footprint. The first conductive traces are selectively configurable according to a selected one of the first and second communications link types. The printed circuit board includes a second conductive traces coupled to the second footprint portion and the first device footprint. in at least one embodiment of the apparatus, the first communications link type is AC-coupled and the second communications link type is DC-coupled.

Abstract: The invention relates to a spark gap arrangement comprising two preferably flat, opposing electrodes (1) that are held apart in a housing body (13), said electrodes forming an arc combustion chamber, and comprising a gas-cooling and pressure-compensating chamber that is connected to the arc combustion chamber. According to the invention, the housing body (13) is formed from two half-shells (14, 16), each of which has first recesses that lie opposite each other in one plane for electrode connecting limbs (3), said limbs being connected to a connecting terminal (15) on the outside of the housing body. Each of the half-shells (14, 16) has a first space for receiving an insulating material support (11) for the electrodes (1) and a second space for receiving a cooling block (8), which has channels, with a high heat capacity.

Abstract: An isolator 10 is formed with an isolation transformer 13 that blocks an abnormal voltage entering from a communication line 30 and protects a protection target device 40. A pulse transformer 43 in the device 40 includes a primary winding 43a connected to a secondary winding 13b of the transformer 13 and a secondary winding 43b connected to an inner circuit. A medium tap of the primary winding 43a is grounded through an inner capacitance Ci of the device 40. A parasitic capacitance Cs between the primary winding 13a and the secondary winding 13b of the transformer 13 and the inner capacitance Ci are connected in series, an abnormal voltage is divided by the capacitance Cs and the capacitance Ci, and a capacitance value of the capacitance Cs is set such that the divided voltage of the capacitance Ci is equal to or below a predetermined value.

Abstract: A method for multivariable measurements using a single-chip impedance analyzer includes providing a sensor, exposing the sensor to an environmental parameter, determining a complex impedance of the sensor over a measured spectral frequency range of the sensor, and monitoring at least three spectral parameters of the sensor.

Abstract: A high voltage discharge protective device for an RF device having a signal port, includes a blocking capacitor arranged at the signal port of the RF device, a circuit board for mounting the blocking capacitor, and a metal conductor grounded and partially bare. The blocking capacitor includes a main body and two leads connected to the main body and secured to the circuit board. The bottom portion of the main body is bare to form an exposed portion. The exposed portion is spaced apart from the circuit board to form an interval. The metal conductor is disposed within the interval and corresponds to the exposed portion of the blocking capacitor. When the passing voltage within the blocking capacitor reaches a predetermined value, the exposed portion of the blocking capacitor sparkly discharges to the metal conductor. An RF device is also provided.

Abstract: An F connector coupled to a transmission line applies a radio frequency (RF) signal to an RF input of a filter of a set-top box via an impedance matching network that includes a first inductor and a second inductor that are coupled in series. A capacitor and a third inductor are coupled in parallel between a discharge tube and a junction terminal that is interposed between the series coupled inductors for protecting electronic components such as the filter from a voltage surge developed in the transmission line.

Abstract: A signal generator generates an electrical signal that is sent to an amplifier, which increases the power of the signal using power from a power source. The amplified signal is fed to a sender transducer to generate ultrasonic waves that can be focused and sent to a receiver. The receiver transducer converts the ultrasonic waves back into electrical energy and stores it in an energy storage device, such as a battery, or uses the electrical energy to power a device. In this way, a device can be remotely charged or powered without having to be tethered to an electrical outlet.

Abstract: An overvoltage clipping device for clipping an overvoltage occurring at a main transformer of a wind turbine is provided. The overvoltage clipping device includes a detection unit for detecting an actual voltage level at the main transformer. The determination unit which is operatively connected to the detection unit determines whether the actual voltage level is above a predetermined reference voltage level. At least one switching unit is provided which is operatively connected to the determination unit for electrically coupling at least two transformer terminals of the main transformer. The control unit drives the switching unit if the detected actual voltage level is above the predetermined reference voltage level such that the at least two transformer terminals are electrically coupled to each other by the switching unit.

Abstract: An F connector coupled to a transmission line applies a radio frequency (RF) signal to an RF input of a filter of a set-top box via an impedance matching network that includes a first inductor and a second inductor that are coupled in series. A capacitor and a third inductor are coupled in parallel between a discharge tube and a junction terminal that is interposed between the series coupled inductors for protecting electronic components such as the filter from a voltage surge developed in the transmission line.

Abstract: A telecommunications system uses a breakout device to connect a primary power cable to different secondary power cables that connect to different remote radio units (RRUs). For example, the breakout device may include a power distribution terminal that connects ?48 VDC and return power lines in the primary power cable to different ?48 VDC and return power lines in the secondary power cables. In another example, the breakout device may connect a hybrid cable that includes both power lines and fiber optic lines. A surge protection system may be located in the breakout device to protect the RRUs and other electrical device from power surges. Alternatively, the surge protection system may be located in jumper power cables connected between the breakout device and the RRUs.

Abstract: A modular lightning surge protection apparatus is applied to a single-phase three-wire power system with a line, a neutral, and a ground. The modular lightning surge protection apparatus includes a substrate, a surge protection unit, a first temperature fuse, and a second temperature fuse. The surge protection unit has a first surge protection element, a second surge protection element, and a third surge protection element to form a wye connection or a delta connection structure. Furthermore, the surge protection unit, the first temperature fuse, and the second temperature fuse are electrically connected on the substrate to form a small-scale modular circuit integration structure.

Abstract: A surge suppression system provides surge protection both locally within the radio station building were the power plant and telecommunication equipment are located and remotely next to the radios and antennas located outside of the building on the communication tower. An external surge suppression unit provides a waterproof enclosure for both surge suppression devices and fiber optic connectors. A rack mountable surge suppression unit provides local in-line surge suppression protection for the electrical equipment located in the communication station. A unique surge suppression tray is hot swappable so that multiple surge suppression devices can be replaced at the same time without disrupting radio operation. Pluggable surge suppression modules can be used in both the external surge suppression unit and the rack mountable surge suppression unit.

Abstract: A protector module for use with a communication system, such as a telephone system having a tip line and a ring line, includes a base member and a plurality of electrically conductive pins mounted on the base member. A first electrical contact is fixedly mounted on the top surface of the base member and is in electrical communication with one of the tip line and the ring line. A movable second electrical contact is connected to a ground pin mounted on the base member and is situated in alignment with the first electrical contact. A solder pellet, which may melt in high current, long duration power surges, and a solid state device, are positioned between the first and second electrical contacts.

Abstract: A network signal processing circuit includes at least one transmission line and at least two transient voltage suppressors. The transmission line has a first connection end and a second connection end. Each of the transient voltage suppressors is connected between a grounding point and a node on the transmission line. Two of the transient voltage suppressors are connected in parallel. A micro resistor is connected in series on the line where each of the transient voltage suppressors is located. By using the micro resistors connected in series on the lines where the two transient voltage suppressors connected in parallel are located, an overcurrent in a lightning signal can be diverted through the two transient voltage suppressors connected in parallel.

Abstract: A method of controlling a magnitude of an electrical parameter in a power system via a high voltage electron tube. The method includes the steps of measuring the magnitude of the electrical parameter; generating a control signal based on the magnitude of the electrical parameter and on a reference magnitude of the electrical parameter; and switching the high voltage electron tube via the control signal such that the reference magnitude of the electrical parameter is essentially obtained. A control arrangement and a power system is also presented.

Abstract: A device for suppressing very fast transients, applicable in protecting electric and/or electric power equipment, and especially transformers operating in electric power substations and in wind power plants, connected in a supply network circuit downstream of a circuit breaker and upstream of the protected equipment is disclosed. The device is a component of an induction character, comprising a high-frequency magnetic core arranged around the current-conducting lead. On the magnetic core is wound at least one winding with at least one pair of terminals used for connecting at least one damping resistor. The inventive device contains an insulating body in which there is a magnetic core, a damping resistor and a winding, or an insulating body in which there is a magnetic core together with a damping resistor, a winding and a section of a current-conducting lead.

Abstract: An electrical surge protection device can provide surge protection and electrostatic discharge protection to power over Ethernet (PoE) ports and devices attached thereto. The PoE surge protection device includes connectors on each side thereof with a surge protection circuit disposed between the connectors. The surge protection circuit offers low capacitance while protection equipment connected to the device. The surge protection device can be, for example, mounted on a patch panel to protect equipment connected thereto.

Abstract: A high voltage discharge protective device for an RF device having a signal port, includes a blocking capacitor arranged at the signal port of the RF device, a circuit board for mounting the blocking capacitor, and a metal conductor grounded and partially bare. The blocking capacitor includes a main body and two leads connected to the main body and secured to the circuit board. The bottom portion of the main body is bare to form an exposed portion. The exposed portion is spaced apart from the circuit board to form an interval. The metal conductor is disposed within the interval and corresponds to the exposed portion of the blocking capacitor. When the passing voltage within the blocking capacitor reaches a predetermined value, the exposed portion of the blocking capacitor sparkly discharges to the metal conductor. An RF device is also provided.

Abstract: An electronic appliance powered by a power supply unit connected to a mains type electricity network, and for connection to a transmission line having two conductor elements and to a terminal in order to transfer data between the line and the terminal. The appliance has a front-end component connected to the line via an isolating transformer. Also, various additional components are connected to an electrical ground of the appliance. A discharge component is connected to the conductor elements of the line and becomes conductive in the event of a voltage surge due to a lightning strike. This eliminates the surge by establishing a flow of current from the line to electrical ground. A capacitive and/or resistive type divider component is interposed between the discharge component and electrical ground in order to co-operate with the power supply unit and/or one or more additional components to constitute a divider bridge.

Abstract: To prevent damage on an element even when a voltage high enough to break the element is input. A semiconductor device of the invention operates with a first voltage and includes a protection circuit which changes the value of the first voltage when the absolute value of the first voltage is higher than a reference value. The protection circuit includes: a control signal generation circuit generating a second voltage based on the first voltage and outputting the generated second voltage; and a voltage control circuit. The voltage control circuit includes a transistor which has a source, a drain, and a gate, and which is turned on or off depending on the second voltage input to the gate and thus controls whether the value of the first voltage is changed based on the amount of current flowing between the source and the drain. The transistor also includes an oxide semiconductor layer.

Abstract: Approaches are described for managing effects such as interference, crosstalk, and other types of noise in an electronic environment using a physical and/or electronic switch to improve antenna performance. For example, in the situation where the connector is connected to the device and no data and/or power is being transferred through the connector, the switch is caused to be open. In this situation, because the connector will be an electrically floating metal instead of a grounded metal due to the open switch, at least a portion of the radiated and/or received antenna signals will not couple to the connector. In the situation where the connector is connected to the device and is being used to transfer data and/or power, the switch is caused to be closed, which will result in the connector being grounded. In such a situation, at least a portion of the noise generated by the connector due to transferring data and/or power will be grounded instead of being coupled to the antenna.

Abstract: The present invention relates to a device and method for displaying the lifecycle of a surge protection device, and more particularly to a device and method for displaying the lifecycle of a surge protection device, which detects an increase in leakage current according to a deterioration in performance of the surge protection device in order to provide notice of a replacement time for the surge protection device. According to the present invention, it is possible to for a user to provide notice of a replacement time by displaying the lifecycle of a surge protection device (SPD) to the outside. Additionally, as another effect of the present invention, it is possible to confirm an amount of leakage current flowing into the ground of the SPD and whether the SPD is properly installed on a ground line by using a current and ground state detecting sensor.

Abstract: A surge suppression system provides surge protection both locally within the radio station building were the power plant and telecommunication equipment are located and remotely next to the radios and antennas located outside of the building on the communication tower. An aerodynamically shaped remote surge suppression unit provides a waterproof enclosure for both surge suppression devices and fiber optic connectors. The unit has reduced wind load and reduced weight and can be placed on a wide variety of different radio tower and building structures with tight space restrictions. A rack mountable surge suppression unit provides local in-line surge suppression protection for the electrical equipment located in the communication station. A unique surge suppression tray is hot swappable so that multiple surge suppression devices can be replaced at the same time without disrupting radio operation.

Abstract: A surge protection circuit includes a first terminal that is coupled to a transmission path, a second terminal that is coupled to a PHY circuit to transfer a signal on a physical layer, a clamping unit that is coupled so as to branch from a first line between the first terminal and the second terminal, the clamping unit clamping a voltage applied to the first terminal to a specific clamping voltage, and a first semiconductor switch that is arranged between the second terminal and a branching point at which the clamping unit branches from the first line, the first semiconductor switch having a rectification direction away from the second terminal toward the first terminal, the first semiconductor switch having a higher reverse breakdown voltage than a clamping voltage of the clamping unit.

Abstract: Rack-mountable, tiltable surge protector housings for power surge protector accessibility are disclosed. Related assemblies, methods, and base station equipment are also disclosed. The surge protector housings may be installed in an equipment rack to support the surge protector housing for use. The surge protector housings support one or more surge protectors for receiving input power through the surge protector housing. The surge protector housing is configured to provide surge protected output power from the received input power. The surge protector housings include a front section having surge protectors supported therein. The front section can be tilted to provide convenient access to the surge protectors, such as during installation and replacement of surge protectors, and connecting power to and disconnecting power from the surge protectors.

Abstract: Rack-mountable, tiltable surge protector housings having translatable surge protector trays for surge protector accessibility are disclosed. Related assemblies, methods, and base station equipment are also disclosed. The surge protector housings may be installed in an equipment rack to support the surge protector housing for use. The surge protector housings support one or more surge protectors for receiving input power through the surge protector housing. The surge protector housing is configured to provide surge protected output power from the received input power. The surge protector housings include a surge protector tray having surge protectors supported therein that is translatable to be extendible from and retracted into the surge protector housing to provide convenient access to the surge protectors, such as during installation and replacement of surge protectors, and connecting power to and disconnecting power from the surge protectors.

Abstract: In a grounded electrically conductive housing for an electrical device, common electrically conductive connection points for one or more components connected thereto to be protected from harmful voltage surges, are provided with a spark gap formed between the connection points and ground, via either electrically conductive surge rods, electrode chips, or eyelets for conducting the voltage surges across the spark gap to ground thereby protecting the associated components from damage due to a voltage surge.

Abstract: An electrical apparatus, which is immovable in a facility, comprises plural electric circuits. Each electric circuit has one or more resistance elements and is connected to each input terminal connected a power source. The electric circuits are arranged positionally closely with each other. In each electric circuit, a desired functional circuit is connected in series to the resistance element, and a protection circuit is connected in series to the resistance element and connected in parallel with the functional circuit. A discharge member is provided in each electric circuit and arranged between each input terminal and the functional circuit. The discharge member includes a discharge gap which allows the discharge member to face with the discharge member of an adjacently arranged electric circuit. The discharge gap discharge deliberately to the adjacently positioned discharge member when a voltage applied to a selected electric circuit exceeds a predetermined voltage value.

Abstract: An apparatus for an electrical equipment enclosure with tubular and/or multi-hole gland weatherproofing of electrical connections is disclosed. In one embodiment of the invention, one or more weatherproofing tubes and/or one or more multi-hole glands attached to the lid incorporating one or more openings are configured to serve as passageways for one or more electrical lines which need to stay weatherproof, watertight, and/or splash-proof from external elements. Furthermore, in one embodiment of the invention, one or more clusters of electrical connectors inside the electrical equipment enclosure receive a portion of the one or more electrical lines passing through one or more openings and one or more weatherproofing tubes and/or multi-hole glands. The apparatus as embodied by the present invention provides a reliable, durable and cost-effective weatherproof electrical equipment enclosure design.

Abstract: A surge suppression system provides surge protection both locally within the radio station building were the power plant and telecommunication equipment are located and remotely next to the radios and antennas located outside of the building on the communication tower. An external surge suppression unit provides a waterproof enclosure for both surge suppression devices and fiber optic connectors. A rack mountable surge suppression unit provides local in-line surge suppression protection for the electrical equipment located in the communication station. A unique surge suppression tray is hot swappable so that multiple surge suppression devices can be replaced at the same time without disrupting radio operation. Pluggable surge suppression modules can be used in both the external surge suppression unit and the rack mountable surge suppression unit.

Abstract: Providing noise protection in a signal transmission system that includes a first component, second component, controller, switch, and pre-charged capacitor, the first and second components coupled by a signal line, the controller coupled to the switch, the switch configured to couple the signal line to the capacitor when activated, where providing noise protection includes: determining, by the controller, that a signal transmitted on the signal line transitioned to a steady state voltage; enabling, by the controller responsive to determining that the signal transitioned to the steady state voltage, noise protection to the signal on the signal line including activating the switch thereby coupling the signal line to the pre-charged capacitor, the pre-charged capacitor providing noise protection to the signal on the signal line; and prior to the signal on the signal line transitioning from the steady state voltage, deactivating the switch, thereby decoupling the signal line from the pre-charged capacitor.

Abstract: A communication system includes a host device and a peripheral device. The host device includes a data terminal and a power terminal. A data conductor extends between the host device and the peripheral device. The data conductor is configured to channel data between the data terminal and the peripheral device. A power conductor extends between the host device and the peripheral device. The power conductor is configured to channel power between the power terminal and the peripheral device. A zener diode couples the data conductor to the power conductor. The zener diode is configured to control a voltage channeled between the host device and the peripheral device while data is channeled through the data conductor at a desired speed that is greater than a predetermined threshold.

Abstract: A surge suppressor device includes a first housing defining a first cavity, input and output conductors disposed in the first cavity of the first housing, a capacitor connected in series with the input conductor and the output conductor, a first spiral inductor having an inner edge connected to the input conductor and an outer edge and a second spiral inductor having an inner edge connected to the output conductor and an outer edge. The surge suppressor device further includes a second housing defining a second cavity and connected to the first housing, a feed-through connecting the first cavity to the second cavity, a non-linear protection device positioned in the second cavity of the second housing and a first electrical wire passing through the feed-through and connecting the outer edge of the first spiral inductor to the non-linear protection device.

Abstract: Pluggable module that includes a module housing having mating and trailing ends and a sidewall that extends therebetween. The sidewall extends along a longitudinal axis. The pluggable module further comprises a latch mechanism that is attached to the trailing end of the module housing. The latch mechanism includes a coupling arm that extends along the sidewall toward the mating end and also an operator handle that is operatively connected to the coupling arm at a latch joint. The operator handle projects away from the trailing end of the module housing. The operator handle is configured to be pressed by an actuating force to move the coupling arm into a flexed position. The latch joint moves when the operator handle is pressed and the coupling arm moves away from the sidewall to the flexed position. The coupling arm returns toward the sidewall when the actuating force is removed.

Abstract: A multi-layered component is disclosed, including at least one inductive region, wherein the inductive region includes a ferrite ceramic. The inductive region has electrode structures that form at least one inductance. The multi-layered component has at least one capacitive region, wherein at least one capacitive region includes a varistor ceramic. The capacitive region forms at least one capacitance. At least one inductive region and at least one capacitive region form at least one LC filter.

Abstract: A structure for protecting a circuit connected to first and second rails of a telephone connection against overvoltages, including: first and second diodes in anti-series between the first and second rails; a first capacitor in parallel with a first resistor between a first node common to the first and second diodes and a low voltage reference node; and a protection element capable of removing fast overvoltages between any of the rails and the low reference voltage node when these overvoltages exceed a first threshold associated with the voltage of the first node.

Abstract: A surge protection apparatus for a power cable assembly is disclosed. The surge protection apparatus is located in-line with the power cable and may be integrated into or be a separate component from the power cable assembly and provide surge protection without the need to locate a surge protection device in a terminal. In this way, the terminal remains small and lightweight while the surge protection can be provided as needed. The apparatus may be used for power-only assemblies as well as hybrid power/fiber assemblies.

Abstract: In accordance with a non-limiting example, a dual level surge protector adaptively selects the protection level required in response to any expected voltages that will be applied to the tip and ring lines. In one example, the surge protector has a first set value for responding to an applied battery voltage and a second set value for responding to a combination voltage that includes a battery voltage plus a ringing voltage.

Abstract: A surge protection circuit for a line driver of a communication system includes a positive output pad; a negative output pad; a transistor, comprising a first terminal, a second terminal and a third terminal, the first terminal coupled to the positive output pad, the second terminal coupled to the negative output pad; and a trigger circuit. The trigger circuit includes an inverter, comprising an input terminal and an output terminal, the output terminal coupled to the third terminal of the transistor; and a first RC delay circuit. The first RC delay circuit includes a resistor having a terminal coupled to an input terminal of the inverter, and another terminal coupled to a power supply; and a capacitor having a terminal coupled to the input terminal of the inverter and another terminal coupled to a ground. The transistor is within an integrated circuit.

Abstract: An overvoltage protector having a housing and at least one overvoltage limiter arranged in the housing, especially a gas-filled surge arrester (1), a suppressor diode (2) or a varistor. The functional ability and the state of the overvoltage protector can be controlled during operation by associating a monitoring component with the overvoltage limiter which detects a current (i) flowing over the overvoltage limiter component, and by providing an evaluation unit that evaluates the signal of the monitoring component.

Abstract: The invention relates to a protective circuit (10) for the input-side protection of an electronic device (30) operating in the maximum frequency range from high-power interfering impulses in the working frequency range of the device (30), said protective circuit (10) between an input (11) and an output (18) comprising a first limiting circuit (12) having at least one gas discharge tube (GDT1, GDT2) for limiting high interference powers and a second limiting circuit (14, 16) disposed behind the first limiting circuit (12), said second limiting circuit having semi-conductor components (D1, . . . , D4) for limiting smaller interference powers. Protection from particularly high interference powers is achieved in that the first limiting circuit (12) comprises two gas discharge tubes (GDT1, GDT2) connected in parallel and preferably identical.

Abstract: Methods and apparatus for protecting data bus ports and their corresponding PHY devices from taking damage associated with excess voltage across one or more signal pairs during an intermittent connection are provided. Such connections cause the signal pins to carry external device current which raises the signal voltage above the power rails, exceeding the PHY device ratings and causing PHY degradation or destruction. In an exemplary embodiment, an RC circuit is used to detect the voltage level across a signal pair. If this voltage level exceeds a certain preset voltage level, power to the outgoing serial bus port is shut off and return power is abated. While the circuit is responding, the exemplary embodiment uses a 3.6V Zener diode to bleed excess voltage to ground. A current monitor/limiter is also used for limiting current if the voltage level detected exceeds a certain threshold.

Abstract: Embodiments of the present invention disclose a lightning protection radio remote unit RRU, which includes a primary circuit, a secondary circuit, and a working circuit, where the primary circuit and the secondary circuit are configured to convert a power supply output by a power supply system into a working power supply to power the working circuit; the shield layer located on the RRU side of the shielded cable and the shield layer located on the power supply system side of the shielded cable are grounded respectively; a surge over-voltage withstand capability between the primary circuit and the earth is not less than a lightning over-voltage; a surge over-voltage withstand capability between each inner conductor in the shielded cable and the shield layer of the shielded cable is not less than the lightning over-voltage.