Abstract: A network device includes a status displaying module, a network module, a processor, a power providing module, and a power saving circuit. The network module implements network functions of the network device. The status displaying module receives displaying signals from the network module. The processor directs the network module to implement the network functions. The power providing module provides power for the processor, the network module, and the status displaying module. The power saving circuit couples the displaying signals to obtain coupled signals and controls modes of the processor and the power providing module according to presence of the coupled signals.

Abstract: A network device includes a status displaying module, a network module, a processor, a power providing module, and a power saving circuit. The network module implements network functions of the network device. The status displaying module receives displaying signals from the network module. The processor directs the network module to implement the network functions. The power providing module provides power for the processor, the network module, and the status displaying module. The power saving circuit couples the displaying signals to obtain coupled signals and controls modes of the processor and the power providing module according to presence of the coupled signals.

Abstract: A transmission cable includes a cable (20) and a plug (10). The cable includes a communication line (22), a power line (26), a plurality of inner jackets, an outer jacket wrapping the communication line and the power line together, and a metallic jacket for wrapping the communication line. The power line includes a plurality of power conductors, and each of the power conductors is wrapped by one of the inner jackets. The communication line includes a plurality of communication conductors, and each of the communication conductors is wrapped by one of the inner jackets. The plug includes a shell (12), a socket (14) and a plurality of pins (16) disposed in the socket. Each of the communication conductors electrically connects with one of the pins respectively, one of the power conductors electrically connects with pins of the remaining pins, and the metallic jacket is electrically connected to the shell.

Abstract: An inrush current limiting circuit (12) includes a transistor (Q), a switch element (M), and a short-circuit protection circuit (121). An emitter of the transistor is as an input of the inrush current limiting circuit. An input of the switch element is connected to a collector of the transistor. A second output of the switch element is as an output of the inrush current limiting circuit. A first terminal of the short-circuit protection circuit is connected to a first output of the switch element. A second terminal of the short-circuit protection circuit is connected to a base of the transistor. A third terminal of the short-circuit protection circuit is connected to the second output of the switch element.

Abstract: A transmission cable includes a cable (20) and a plug (10). The cable includes a communication line (22), a power line (26), a plurality of inner jackets, an outer jacket wrapping the communication line and the power line together, and a metallic jacket for wrapping the communication line. The power line includes a plurality of power conductors, and each of the power conductors is wrapped by one of the inner jackets. The communication line includes a plurality of communication conductors, and each of the communication conductors is wrapped by one of the inner jackets. The plug includes a shell (12), a socket (14) and a plurality of pins (16) disposed in the socket. Each of the communication conductors electrically connects with one of the pins respectively, one of the power conductors electrically connects with pins of the remaining pins, and the metallic jacket is electrically connected to the shell.

Abstract: A power supply device (1) converting received power signals to direct current signals to ensure a load to work normally. The power supply device includes a transformer circuit (10), a rectifier circuit (11), and an inrush current control circuit (12). The transformer circuit converts the received power signals to alternating current signals. The rectifier circuit is connected to the transformer circuit, and converts the alternating current signals to direct current signals. The inrush current control circuit is connected to the rectifier circuit, for limiting inrush current from the power supply device. The inrush current control circuit includes a voltage divider resistor (R1) and a filter capacitor (C1). The filter capacitor is connected to the voltage divider resistor in series. In the invention, the power supply device uses the inrush current control circuit to limit the inrush current, thus life of the components is lengthened, and the power supply device is stable.

Abstract: A network device (10) includes a communication slot (100), a first signal processing circuit (300), a second signal processing circuit (400), and a central processing unit (200). The communication slot is used for receiving signals of different bands. The first signal processing circuit is connected to the communication slot, and is used for selecting a first band signal from the signals of different bands, and processing the first band signal thereby generating a processed first band signal. The second signal processing circuit is connected to the communication slot, and is used for selecting a second band signal from the signals of different bands, and processing the second band signal thereby generating a processed second band signal. The central processing unit is connected to the first and the second signal processing circuits, and is used for processing the processed first and second band signals.

Abstract: A method for preventing the snap down effect in a power rectifier with higher breakdown voltage comprises the step of forming an isolation layer between the semiconductor substrate and the epitaxy layer. The isolation layer can prevent the dislocation occurred upon the semiconductor substrate from influencing the p-n junction atop. Therefore, the power rectifier manufactured by the method of the present invention can work under a higher breakdown voltage exceeding 450 V with reduced cost.