A universal serial bus (USB) server includes USB connectors. Each USB connector is configured to interface via USB to an endpoint server. The server includes a terminal manager configured to issue a command to a first endpoint server via a selected one of the USB connectors. The selected USB connector is associated with and connected to the first endpoint server. The terminal manager is further configured to determine whether a response has been received to the command, and, based on a determination that no response has been received to the command, attempt to power up the first endpoint server through the selected one of USB connectors.

A method for verifying interconnection of a PSE and PD with 4-pair PoE capabilities includes performing a first classification event on first and second pairs, respectively, and detecting a first predetermined class current on first and second sets of twisted pairs, respectively. The method includes performing a second classification event on first and second pairs, respectively, and detecting first and second predetermined class currents on first and second pairs, respectively. After expiration of a first variable delay period related to a first pseudo-random variable of the PSE, the method includes performing a third classification event on the first pair and detecting a first derived class current on the first pair. After expiration of a second variable delay period related to a second pseudo-random variable of the PD, the method includes performing the third classification event on the second pair and detecting a second derived class current on the second pair.

A method for a multichannel geophysical data acquisition system is provided in the field of electrical resistivity tomography. Individual and autonomous node operating systems are provided. Separate communication channels for upstream and downstream data transfer, high voltage transfer and synchronization signals are provided. A novel use of high voltage isolation barriers is also provided. A direct memory access data transfer process is provided.

A power management subsystem included in a computer system may include a host device and a power circuit group. The power circuit group includes multiple power circuits arranged in a tree-like structure. The resources of the multiple power circuits are mapped to corresponding addresses within a common address space. The host device sends, via a first communication bus, commands to a branch power circuit of the multiple power circuits, which, in turn, relays the commands, using a second communication bus, to corresponding ones of the other power circuits based on respective power resources specified in the commands received from the host device.

A charger, a data cable, and a charging device. The charger includes a first Type-A port, a PD charging processing unit, a non-PD charging processing unit, a data cable matching unit, and a first switching unit; where the first Type-A port includes a first communication pin and a second communication pin, and in a case that the charger is connected to a first data cable, the first switching unit connects the first communication pin to the PD charging processing unit and the second communication pin to the data cable matching unit to transmit a PD charging signal through the first communication pin, where the data cable matching unit determines, based on a communication signal transmitted through the second communication pin, whether the data cable is a first data cable.

A galvanically separating interface for transmitting electrical energy and data packets is based upon the clocked polarity reversal of a primary coil such that a corresponding alternating voltage signal is induced in a secondary coil. The primary coil is separated from the supply voltage or ground after each polarity reversal per cycle for a defined dead time. Electrical pulses are generated in the primary coil within dead times and correspond to the data packet to be transmitted. By rectifying the alternating voltage signal induced in the secondary coil, the transmitted energy can be used. Simultaneously, the pulses generated on the primary side can be detected via the secondary coil in accordance with the transmission standard as the data packet to be transmitted. This use of dead times as a “bit” enables a rapid data transmission rate which corresponds to the polarity reversal clock rate.

An arrangement that includes a bus subscriber with two power supply terminals, at least one bus line terminal and a bus interface circuit for controlling a data flow via the at least one bus line terminal, wherein a controllable switch is located between the bus interface circuit and the at least one bus line terminal and the bus subscriber contains a sensor circuit which records the voltage between the power supply terminals or a voltage derived therefrom and closes the controllable switch if the recorded voltage exceeds a threshold value and opens the same if the recorded voltage fails to reach the threshold value, where with an arrangement including at least two bus subscribers, these bus subscribers are connected with their bus line terminals to a bus having at least one bus line and with their power supply terminals via two current lines to a shared voltage source.

A power sourcing equipment is provided. The power sourcing equipment may include an input terminal, an output terminal, a switch, and a device detection circuit. The input terminal may receive a power signal. The output terminal may be electrically coupled to a powered device via a coaxial cable, which transmits the power signal from the power sourcing equipment to the powered device or a data signal from the powered device to the power sourcing equipment. The switch may control an electrical connection between the input and output terminal(s). The device detection circuit may detect whether the data signal is being transmitted from the powered device to the power sourcing equipment. If the data signal is not being transmitted from the powered device to the power sourcing equipment, the device detection circuit may control an operation of the switch based on an electrical parameter associated with the powered device.

In an embodiment, a data processing system comprises: a power distribution circuit that is configured to distribute electrical power to one or more network devices; a microcontroller; data transceiving logic that is configured to establish connectivity with the one or more network devices and the power distribution apparatus; receive a first data stream from a first network device; generate a combined signal by combining the first data stream with a power signal into the combined signal; one or more ports that are configured to transmit the combined signal to the one or more network devices.

In one embodiment, a master device has a first port and a second port and initially applies a DC voltage only to the first port. A plurality of slave devices, each have a third port and a fourth port, are serially connected to the master device in a ring, via conductors, starting at the first port and ending at the second port. The conductors simultaneously carry the DC voltage and differential data. Each slave device, after performing a detection routine, then sequentially applies the DC voltage to the adjacent downstream slave device in a first direction around the ring. If the master does not detect the presence of the DC voltage at its second port, the master device applies the DC voltage to both the first port and the second port to sequentially power up the slave devices in both directions around the ring of slave devices.