Abstract: A network switch testing device and a method for testing at least one network switch involve a central processing unit (CPU), a first acceleration port, a second acceleration port, and at least one transmission port connectable with at least one to-be-tested transmission port of at least one to-be-tested network switch. The first and second acceleration ports and the at least one transmission port are set to the same virtual local area network (VLAN). The CPU transmits at least one packet to the first acceleration port. The first and second acceleration ports use internal loopbacks and VLAN's flooding mechanism to make the packet(s) reach a predetermined line rate, and transmit the predetermined-line-rate-reaching packet(s) to the at least one transmission port. The at least one transmission port transmits the predetermined-line-rate-reaching packet(s) to the to-be-tested transmission port(s), and the CPU stops the transmission port(s) from transmitting the packet(s) when the testing time ends.

Abstract: An antenna system with a switchable horizontal half-power beamwidth includes: a ground plane module including rows of patch groups that jointly form a ground plane; an antenna unit spaced apart from the ground plane by an interval; and a control module that can receive at least one beam control message. Each two adjacent rows of the patch groups are provided therebetween with at least one switching unit. The control module can bring each of the at least one switching unit to be turned on or turned off according to contents of the at least one beam control message, so as to adjust the electrical properties of the ground plane and change the horizontal half-power beamwidth of the antenna unit. Accordingly, the antenna system has a relatively low-profile spatial property, and requires no extra mechanism design for horizontal half-power beamwidth adjustment and switching based on practical needs.

Abstract: A microstrip antenna includes a substrate, a feedline, an impedance matching structure, and a patch radiator, wherein the substrate has a surface. The feedline is disposed on the surface and extends along a first axial direction. The impedance matching structure is disposed on the surface and has a first end and a second end in the first axial direction, wherein the first end is connected to the feedline. The impedance matching structure has a stepped impedance change. The patch radiator is disposed on the surface, wherein the patch radiator and the second end of the impedance matching structure are adjacent and spaced by a distance in the first axial direction, and the second end of the impedance matching structure is coupled with the patch radiator through the distance. Therefore, a bandwidth of the microstrip antenna could be increased.

Abstract: An airtight-level sensor includes an air pump, a sounding mechanism, and a processing device. The air pump comprises an inlet valve and an outlet valve, the sounding mechanism is disposed near the outlet valve to generate a sound wave corresponding to an airflow blown from the outlet valve, and the processing device is disposed near the sounding mechanism to receive the sound wave generated therefrom and determines an airtight-level of an airtight chamber wherein the airtight-level sensor is disposed.

Abstract: A circuit for status monitoring, and fault recovery and isolation for an I2C bus is provided. The I2C bus is electrically connected to a master device and a plurality of slave devices. Each of the slave devices has an address. The circuit includes a receiver unit, a decoder unit, and a troubleshooting unit. The receiver unit can receive a data signal and a clock signal that are transmitted from the master device to the I2C bus. The decoder unit is configured to obtain address information and a read/write bit based on the data signal and the clock signal. The troubleshooting unit is configured to, when the troubleshooting unit determines that a target slave device is malfunctioning based on the data signal, the clock signal, and the read/write bit, identify the target slave device based on the address information, and perform a troubleshooting operation on the target slave device.

Abstract: A thermal module for being disposed in an electronic device comprises a driving device and at least one thermal device. The driving device includes a driving member and a driven member which are connected together, wherein the driving member is adapted to drive the driven member to operate. The at least one thermal device includes a fan, wherein two opposite ends of the fan respectively have a mating portion and a connecting portion. The mating portion is adapted to be connected to the driven member, so that the driving member drives the driven member to drive the fan to rotate. The connecting portion of the fan is adapted to be connected to the mating portion of a fan of another thermal device, so that when the driving member drives the fan to rotate, the fan drives the fan of the another thermal device to rotate.

Abstract: A broadband dual-feed circularly-polarized antenna includes first, second and third substrate modules. The first substrate module includes a parasitic element, and a radiator disposed below the parasitic element. The second substrate module is stacked below the first substrate module, and is provided with first and second slots. The third substrate module is stacked below the second substrate module, and includes first and second feed lines. When the antenna operates in a transmit mode, signals fed to the first and second feed lines are electromagnetically coupled to the first and second slots, then to the radiator, and finally to the parasitic element, and the parasitic element transmits an electromagnetic wave. When the antenna operates in a receive mode, the parasitic element receives an electromagnetic wave, and the electromagnetic wave is electromagnetically coupled to the radiator, then to the first and second slots, and finally to the first and second feed lines.

Abstract: A device includes a signal-edge detector, an anomaly detector and a reset-interrupt generator. The signal-edge detector outputs a timing-start signal when detecting that a logic level of an SDA signal from an SDA line of an I2C bus changes from logical high to logical low, and outputs a timing-reset signal when detecting that the logic level changes from logical low to logical high. Upon receiving the timing-start signal, the anomaly detector starts to time a timing duration, and outputs an error signal when the timing duration reaches a preset time duration. Upon receiving the timing-reset signal, the anomaly detector resets the timing duration to zero. In response to receipt of the error signal, the reset-interrupt generator outputs an interrupt signal to a processor for removing an abnormal state, or outputs a pin-reset signal to an optical module to reset a pin connected to the SDA line.

Abstract: An electronic device includes a heat dissipation structure including a first heat dissipation member and a second heat dissipation member. The first heat dissipation member is disposed on a circuit board and is made of a thermally conductive material. The second heat dissipation member is disposed close to an antenna. A projection of the second heat dissipation member on an output surface of the antenna at least covers a portion of the output surface of the antenna. The second heat dissipation member is in contact with the first heat dissipation member. The second heat dissipation member is made of a plastic material mixed with a plurality of ceramic particles.

Abstract: A radome for protecting a radar device is disposed in the transmission path of signals to/from the radar device. The radome includes a shell; a first circuit board disposed at a side of the shell facing a radar device to be protected, and configured with a first inner circuit ring and a first outer circuit ring facing toward the shell; a second circuit board disposed between the first circuit board and the shell, and configured with a second inner circuit ring and a second outer circuit ring facing toward the shell; a first insulation layer disposed between the first circuit board and the second circuit board; and a second insulation layer disposed between the second circuit board and the shell. The first and second inner circuit rings are enclosed with and insulated from the first and second outer rings, respectively, and each of the circuit rings forms a closed loop.

Abstract: An apparatus for synchronous Ethernet comprises a processor, a field programmable gate array, a synchronizer, a physical layer implementor and a media accessing controller, wherein, the processor transmits a control data through a first transmission interface; the field programmable gate array receives the control data, generates a control instruction in accordance with the control data and transmits the control instruction through a second transmission interface; the synchronizer receives the control instruction and generates a synchronous clock in accordance with the control instruction; and each of the physical layer implementor and the media accessing controller receives and works in accordance with the synchronous clock and media accessing control protocol.

Abstract: A system for physical-distancing detection in a specified area includes a locator locating a positioning quadrangle plane in a specified area; an image-capturing device obliquely capturing an image of the specified area to generate a captured image of the specified area; and a coordinate converter defining a coordinate conversion function according to raw coordinates of selected points of the positioning quadrangle plane in the captured image of the specified area and reference coordinates of the selected points of the positioning quadrangle plane in an overlooked image of the specified area. The image-capturing device converts raw coordinates of the captured image of the specified area into converted coordinates of the overlooked image of the specified area by way of the coordinate conversion function, determines a physical-distancing condition between two persons according to the converted coordinates, and automatically takes an action corresponding to the physical-distancing condition.

Abstract: A multiband antenna includes a first radiator, a feed element, a first ground element, a second radiator, a connecting element, and a second ground element, wherein the first radiator is made of a metal plate. The feed element is electrically connected to the first radiator and is adapted to feed a signal. The first ground element is electrically connected to the first radiator. The second radiator is made of a metal plate and surrounds an outer side of the first radiator, wherein the first radiator and the second radiator are spaced by an interval. The connecting element is electrically connected to the first radiator and the second radiator. The second ground element is electrically connected to the second radiator. In this way, the multiband antenna is suitable for transmitting signals in multiple frequency bands.

Abstract: An easily mountable device bracket assembly includes a first bracket having a side that can be provided with at least one mounting member, a second bracket, and a third bracket having a side that can be fixed to a device housing and at least one bent portion having an inner wall spaced apart from an outer wall of the third bracket to form a slide groove. At least one gap formed by the mounting member and the side of the first bracket forms another slide groove. The second bracket can extend into the another slide groove in a connecting direction to be connected with the first bracket. When the device mounted with the third bracket is placed into an open rack or rack-type cabinet, the slide groove is in contact with the first bracket, and the third bracket is connected to the first bracket slidingly along the connecting direction.

Abstract: A screw having stacked screw heads includes a screw shank portion with a thread and a screw head portion rigidly connected to each other. The screw head portion is driven to bring the screw shank portion to rotate. The screw head portion includes a first screw head and a second screw head. The first screw head has a first shaped groove on its top plane to receive an operating torque. A neck portion is connected to a bottom plane of the first screw head and a top plane of the second screw head. The second screw head has a second shaped groove on its top plane. The neck portion or the connection between the neck portion and the first screw head or the second screw head has lower torsional endurance than each of the first screw head and the second screw head.

Abstract: In a voice signal relay and transfer method for a voice call between a radio voice terminal and a remote device includes, a radio voice signal is received from the radio voice terminal and converting the radio voice signal into a digital voice signal. The digital voice signal is further converted into a group of voice packets in a streaming form. Then the group of voice packets is transmitted to a streaming server via a mobile communication network. The group of voice packets is further transferred from the streaming server to the remote device in a streaming form.

Abstract: A separated heat dissipating device, and an optical module system thereof, includes at least one heat dissipating module and at least one suspension mechanism. The heat dissipating module has a lateral surface that can abut against an electronic device's surface, and another lateral surface disposed with at least one first mounting member and mountable with the suspension mechanism. The suspension mechanism includes at least one elastic element that can be sleeved around the first mounting member, a fixing plate formed with at least one through hole allowing passage of the first mounting member and the elastic element to be located between the heat dissipating module and the fixing plate, and at least one second mounting member that can be assembled with the first mounting member. The heat dissipating module moves towards the fixing plate and compresses the elastic element when a surface thereof is applied with a force.

Abstract: A computing device includes a processing unit, a memory unit, a NIC that is for receiving a packet, and a network virtualization platform accommodating a plurality of virtual network applications. The NIC, the processing unit and the memory unit are collectively defined as a hardware layer for the network virtualization platform to operate thereon. The network virtualization platform includes a virtual network layer having a UPF plugin installed therewith. The UPF plugin performs rule matching according to a packet header of the packet, and determines which one of the following steps is to be performed: offloading the packet to one of the virtual network applications in the application layer for the virtual network application to provide services; and re-packaging the packet and forwarding the packet to the another computing device.

Abstract: A computing device includes a processing unit, a memory unit, a NIC that is for receiving a packet, and a network virtualization platform accommodating a plurality of virtual network applications. The NIC, the processing unit and the memory unit are collectively defined as a hardware layer for the network virtualization platform to operate thereon. The network virtualization platform includes a virtual network layer having a UPF plugin installed therewith. The UPF plugin performs rule matching according to a packet header of the packet, and determines which one of the following steps is to be performed: offloading the packet to one of the virtual network applications in the application layer for the virtual network application to provide services; and re-packaging the packet and forwarding the packet to the another computing device.

Abstract: A circuit system for digitally regulating direct-current fan rotation speed includes a parallel data generator circuit, a trapezoidal resistor network circuit, a current amplifier circuit, a linear voltage-controlled resistor circuit, and a fan power converter circuit. The parallel data generator circuit can receive control data and generate corresponding digital parallel data. The trapezoidal resistor network circuit can receive the parallel data and transfer it into a corresponding analog current signal. The current amplifier circuit can receive the current signal and convert it into a corresponding voltage signal. The linear voltage-controlled resistor circuit can receive the voltage signal and generate a corresponding resistance signal according thereto.