In one embodiment, a method includes transmitting data on two wire pairs carrying pulse power, wherein the pulse power comprises a plurality of voltage pulses with the voltage pulses on the wire pairs offset between the wire pairs to provide continuous power and identifying transitions between at least one of a pulse-on time and a pulse-off time, and a pulse-off time and a pulse-on time on at least one of the wire pairs. Data transmission on the wire pair is controlled during the identified transitions on the wire pair to prevent interference between the pulse power and the data.

Systems, methods, and processor readable media for distributing digital data and electrical power to a plurality of devices over high-impedance cables are disclosed. Certain embodiments include a gateway device connected to a power source, a first device connected to the gateway device by a cable, the cable being a high-impedance cable having at least two conductive paths, and wherein the first device receives electrical power and digital data from the gateway device via the cable over the same conductive path of the cable, a second device connected to the gateway device by the cable wherein the second device receives power and digital data from the gateway device via the cable over the same conductive path, and wherein the power source provides power to the first and second devices via the cable, and wherein the second device is connected to the gateway device through the first device via a daisy-chain topology.

A communication apparatus is connected to another communication apparatus via a power source line, a signal line, and a shared line. The communication apparatus includes a detector and a communicator. The detector detects the phase of an alternating-current voltage applied between a first terminal for connecting to the power source line and a second terminal for connecting to the shared line. The communicator communicates with the other communication apparatus by executing at least one of transmission or reception of an electric current signal generated by opening and closing a circuit including the signal line and the shared line except when the phase detected by the detector is within a specific range. The specific range is defined as a range in which an induced electric current flowing through the signal line due to the alternating-current voltage is greater than a reference value.

In one embodiment, a method includes transmitting data on two wire pairs carrying pulse power, wherein the pulse power comprises a plurality of voltage pulses with the voltage pulses on the wire pairs offset between the wire pairs to provide continuous power and identifying transitions between at least one of a pulse-on time and a pulse-off time, and a pulse-off time and a pulse-on time on at least one of the wire pairs. Data transmission on the wire pair is controlled during the identified transitions on the wire pair to prevent interference between the pulse power and the data.

A polyphase electric power supply system via which powerline communications are set up between a transmitter and a receiver. The transmitter: detects a first zero-crossing of an alternating electrical signal on a phase connected to the transmitter; determines a first instance when the transmitter is expected to transmit a dataset; determines a first time difference between the first zero-crossing and the first instance; includes in the data set information of the phase to which the transmitter is connected, when the first time difference is below a predefined threshold. The receiver: detects a second zero-crossing of the alternating electrical signal on the phase connected to the receiver; detects a second instant when the receiver receives the data set; determines a second time difference between the second zero-crossing and the second instant; determines the phase connected to the receiver, from the second time difference and the transmitter phase information.

The present disclosure relates to a system for at least one of identifying or verifying which specific data center device, from a plurality of data center devices, is being powered from an AC outlet of a power distribution unit. The system includes a message encoding algorithm module, a message decoding algorithm module and an input signal monitoring subsystem. The input signal monitoring subsystem monitors an AC power signal being supplied to the data center devices, wherein one of the data center devices includes an AC powered target device. A power distribution unit (PDU) supplies the AC power signal to the AC powered target device. The PDU has a controller which uses the message encoding algorithm to create a modulated AC power signal that includes an encoded message in accordance with a predetermined power cycle profile (PCP) event. The target device analyzes the PCP event as the modulated AC power signal is received and creates a decoded message therefrom. The decoded message is used to indicate whether the AC outlet of the PDU is providing power to the target device.

A communication apparatus is connected to another communication apparatus via a power source line, a signal line, and a shared line. The communication apparatus includes a detector and a communicator. The detector detects the phase of an alternating-current voltage applied between a first terminal for connecting to the power source line and a second terminal for connecting to the shared line. The communicator communicates with the other communication apparatus by executing at least one of transmission or reception of an electric current signal generated by opening and closing a circuit including the signal line and the shared line except when the phase detected by the detector is within a specific range. The specific range is defined as a range in which an induced electric current flowing through the signal line due to the alternating-current voltage is greater than a reference value.

Systems, methods and apparatus are described that facilitate transmission of data between two devices within an electronic apparatus. A data transfer method includes receiving from a three-wire interface, a first packet of data encoded in a first sequence of symbols representing transitions in signaling state of the three wires, and transmitting on the three-wire interface, a second packet of data encoded in a second sequence of symbols representing transitions in signaling state of the three wires. The first sequence of symbols may include up to five types of symbol. The second sequence of symbols may include two or three types of symbol.

Systems, methods, and processor readable media for distributing digital data and electrical power to a plurality of devices over high-impedance cables are disclosed. Certain embodiments include a gateway device connected to a power source, a first device connected to the gateway device by a cable, the cable being a high-impedance cable having at least two conductive paths, and wherein the first device receives electrical power and digital data from the gateway device via the cable over the same conductive path of the cable, a second device connected to the gateway device by the cable wherein the second device receives power and digital data from the gateway device via the cable over the same conductive path, and wherein the power source provides power to the first and second devices via the cable, and wherein the second device is connected to the gateway device through the first device via a daisy-chain topology.

A power switch controller includes a condition detector, a zero crossing detector, a retimer, and a driver. The condition detector detects a change in a sense signal towards a first or second condition. The zero crossing detector detects zero crossings in an AC powerline signal. The power switch controller drives a latching relay that connects a load to powerlines. The power switch controller activates or deactivates the latching relay based on the sensed condition, and retimes activation and deactivation pulses to align the relay contact opening and closing times to coincide with the AC powerline zero crossings, compensating for contact travel times. The activation and deactivation pulses have a duration of max 20 ms, and an amplitude of at least 110% of the maximum sustainable voltage for the relay coil(s). A power-on reset deactivates the relay, aligned with a second AC zero crossing.