Detection for four pair powered devices

摘要

A twin power sourcing equipment constituted of: a first power sourcing equipment; and a second power sourcing equipment arranged for connection to a powered device over respective power paths; the first and second power sourcing equipments arranged to: simultaneously perform detection of the powered device; and in the event that at least one of the first and second power sourcing equipments detects the presence of the powered device, alternately perform detection of the powered device to detect a signature impedance; and in the event that each of the alternate detection is indicative of the presence of the signature impedance, provide power to the powered device simultaneously by the first and second power sourcing equipment. Power is not provided to the powered device in the event that the simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path.

主权项

1. A local area network adapted to supply power to a plurality of types of powered devices over communication cabling, the local area network comprising:
a powered device; a first power sourcing equipment; a second power sourcing equipment; and a communication cabling comprising a plurality of twisted wire pairs arranged to connect said first and second power sourcing equipment to said powered device, said communication cabling providing a first power path comprising a first set of twisted wire pairs of said communication cabling between said first power sourcing equipment and said powered device and a second power path comprising a second set of twisted wire pairs of said communication cabling between said second power sourcing equipment and said powered device, said first set different from said second set, said first and second power sourcing equipments arranged to:
simultaneously perform detection of the powered device by each applying a detection voltage to said powered device via the respective one of the first path and the second path to detect said powered device, and determine whether said powered device is present or absent; andin the event that at least one of said first and second power sourcing equipments detects the presence of the powered device by said simultaneous detection, alternately perform detection of the powered device by each alternately applying the detection voltage to said powered device via the respective one of the first path and the second path to detect a signature impedance; andin the event that each of said alternate detection is indicative of the presence of the signature impedance, provide power to said powered device simultaneously by said first and second power sourcing equipment,wherein the power is not provided to said powered device from either the first power sourcing equipment or the second power sourcing equipment in the event that said simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path, and wherein in the event that said simultaneous detection is indicative of the absence of the powered device on each of the first path and the second path, said first and second power sourcing equipments do not alternately perform the detection.