Abstract: A powered device (PD) configured for receiving power over a communication link, such as an Ethernet link, has a power interface controller for implementing a power supply protocol. The power interface controller acquires multiple pieces of PD information representing multiple characteristics of the PD for transferring the PD information to a power supply device.

Abstract: System and methodology for supplying power to a powered device (PD) over a communication link, such as an Ethernet link. The system has a power supply device that provides power to the PD, and a dynamic power allocation mechanism that dynamically modifies power allocated to the PD in accordance with tasks of the PD.

Abstract: System and methodology for providing classification of a load in a power supply system for providing power over a communication link. The power supply system has a classification engine for probing the load to determine a characteristic of the load. The classification engine supplies the load with multiple classification signals to determine multiple response signals presented by the load in response to the respective classification signals.

Abstract: A novel system for supplying power over a communication link, such as an Ethernet cable, having first and second wire sets each composed of two pairs of conductors. The system includes a power supply device, such as power sourcing equipment (PSE), configured for applying power to both the first wire set and the second wire set to deliver the power to a powered device.

Abstract: A Power over Ethernet (PoE) system having a Power Sourcing Equipment (PSE) and a Powered Device (PD) configured for interacting over four pairs of wire provided for supplying power from the PSE to the PD. The PSE and the PD are configured to perform separate PD classification procedures over first and second 2-pair sets to support PoE operations that are not defined by the IEEE 802.3af standard.

Abstract: Novel system and methodology for adjusting a current limit threshold in a Power over Ethernet (PoE) system in accordance with requirements of a Powered Device (PD). A system for supplying power to a PD over a communications link has a requirement determining circuit for determining a PD's requirement, and a control circuit for setting a parameter restricting an output signal of the PSE in accordance with the determined PD's requirement. The control circuit may set a current limit threshold of the PSE and/or the PD in accordance with the determined PD's requirement, such as a power requirement.

Abstract: A power supply system for providing power over a communication link has current limit circuitry for restricting an output current of the system based on a current limit threshold, and threshold circuitry for setting the current limit threshold in accordance with an output parameter of the system. In particular, the threshold circuitry may control the current limit threshold in accordance with an output voltage of the system so as to achieve a substantially constant output power of the system.