Embodiments of this application disclose an optical network unit and a PoE power supply system. The optical network unit in embodiments of this application includes a conductive connection terminal, a switch module, a network transformer, a first voltage conversion module, and a network interface connector. The conductive connection terminal is configured to be connected to a power over Ethernet PoE power supply device, and the conductive connection terminal is connected to the network transformer.

Various embodiments provide for data transmission using alert signals to carry data, which can be used in such applications as data network communications between sensors (e.g., cameras, motion, radar, etc.) and computing equipment within vehicles (e.g., smart and autonomous cars).

A switching device shuts down a machine installation in failsafe fashion. The switching device includes an input for a defined input signal, a first output providing a first current path to the machine installation, a display element capable of assuming first and second states, and a processor having first and second modes of operation. The first current path includes a switching element capable of assuming closed and open operating states. In the first mode, the processor controls the switching element in response to the defined input signal in order to selectively close or interrupt the first current path. In the second mode, the processor controls the switching element into the open operating state regardless of the defined input signal. In the first mode, the display element assumes the first and second display states in response to the switching element being in the closed and open operating states, respectively.

A network and power sharing device is for being connected to first optical network equipment and second optical network equipment that are built in an optical network, so as to establish power supply architecture for the optical network. The network and power sharing device includes: a power input port and a first power port wherein the first power port is connected to the first optical network equipment; and a power control unit received in the casing, for detecting if the power input port and the first power port output power signals and for controlling a power switch unit to switch power supply transmission paths of the power input port and first power port.

A network and power sharing device is for being connected to first optical network equipment and second optical network equipment that are built in an optical network, so as to establish power supply architecture for the optical network. The network and power sharing device includes: a power input port and a first power port wherein the first power port is connected to the first optical network equipment; and a power control unit received in the casing, for detecting if the power input port and the first power port output power signals and for controlling a power switch unit to switch power supply transmission paths of the power input port and first power port.

The meter monitoring device includes a housing, a power supply unit, an image capture unit, a control unit, a first switch, and a clock unit. The housing is configured to be detachably attached to a meter device. The image capture unit is electrically connected to the power supply unit. The control unit is configured to control the image capture unit to capture an image of a surface of the meter device. The first switch is connected between the power supply unit and the control unit. The power supply unit is configured to supply electrical power to the control unit via the first switch. The clock unit is configured to control the first switch to be turned on according to a setting. The power supply unit, the control unit, the image capture unit, the first switch, and the clock unit are all fixed to the housing.

A switching device for switching on and/or switching off an electrical load has an input section for receiving a defined input signal, an output section having an output switching element that provides a current path to the electrical load, and a control section that can be operated in a first active mode of operation or in a second active mode of operation. The control section actuates the output switching element on the basis of the defined input signal in order to close or interrupt the current path. A display element assumes a first display state when the control section is in the first active mode of operation and the output switching element is in the closed operating state. The display element assumes an alternative second display state when the control section is in the first active mode of operation and the output switching element is in the open operating state. The control section interrupts the current path regardless of the defined input signal in the second active mode of operation. The display element assumes the first display state or the alternative second display state in the second mode of operation on the basis of the defined input signal. Preferably, the switching device is used to shut down a dangerous machine installation in failsafe fashion.

Example devices described herein include endpoint devices which may communicate with an access point device by modulating a channel associated with the wireless communication to encode transmit data. The channel modulation may be performed by utilizing a switch to control an impedance of an antenna at the endpoint device to either reflect or absorb wireless network communication signals received by the endpoint device. The access point device may extract the transmit data by decoding changes in the channel caused, at least in part, by the modulation. Access point devices may transmit a pattern of packetsthe presence or absence of which may correspond with transmit data. Endpoint devices may decode this data by using an energy detector to differentiate between the presence or absence of a packet.

A key telephone system includes a terminal and a primary device. The primary device transmits a command for transition into a power-saving state to the terminal, together with a power-saving duration time datum and/or a power-saving deactivating time datum, when the time reaches a power-saving state transition time. The terminal specifies the power-saving duration time and/or the power-saving deactivating time in the timekeeper means, and halts the communication means for communicating with the primary device at the time of receiving the command for transition into the power-saving state from the primary device, and activates the communication means being halted at a time when the timekeeper means has measured the lapse of the power-saving duration time and/or the power-saving deactivating time.

Embodiments of this application disclose an optical network unit and a PoE power supply system. The optical network unit in embodiments of this application includes a conductive connection terminal, a switch module, a network transformer, a first voltage conversion module, and a network interface connector. The conductive connection terminal is configured to be connected to a power over Ethernet PoE power supply device, and the conductive connection terminal is connected to the network transformer.