Patent ID: 6989735
Filing Date: 2006-01-24
Classification: H04B,H04L

Abstract:
1. A power-delivery circuit for delivering a combined power and data signal to a network device, the power delivery circuit comprising: a power-input port receiving a power supply signal; a data-input port receiving a data signal; a mixer circuit combining the power supply signal and the data signal to generate the combined power and data signal; a data/power-output port communicating the combined power and data signal to the network device over a network data cable; a data/power-input port receiving the combined power and data signal via the network cable; and an isolation circuit electrically isolating the network device from the data-input, power-input and data/power-input ports in the event of a specific predefined voltage signal being applied to one of the power-input port, data-input and data/power input ports.