Device and network system

Abstract

Provided are a device and a network system, wherein plural communication ports are switched appropriately between a power receiving port and a power feeding port, thereby dealing with supply of electric power through a network in various network configurations. Plural devices (10) are connected to a network cable (20) to form a network system. In an initial state before power receiving, all plural communication ports (10a,10b) of the device (10) are put in to a power receiving enabling state. When the electric power is supplied from one of the communication ports, other communication ports are put into a power receiving disabling state. The device (10) feeds part of the received electric power to another adjacent device (10) by utilizing the communication port (10a,10b) put into the power receiving disabling state. The supply of electric power can sequentially be performed from the device that receives the supply of electric power from an external power feeding installation (6) to an adjacent device (1,5), and finally all the devices (1-6) receive the supply of electric power through the network.

Description

Technical field [0001] The present invention relates to equipment and network systems that constitute a network, and more specifically, relates to a technical improvement of power supply to the equipment via the network. Background technique [0002] PoE (Power over Ethernet (registered trademark): Power Ethernet) is a technology for power supply using an Ethernet (registered trademark) cable. By using this PoE, it is possible to easily supply power to devices installed in locations where it is difficult to directly supply power. In addition, this PoE can transmit both data and power on the cable, so there is no need to separately arrange the cable for data communication and the cable for power supply, and it can be easily wired when installing various devices that constitute a network system on site. deal with. [0003] In addition, in a network system having a power supply function such as this PoE, a technique has been proposed in which a device connected to the network suppli...

AI Technical Summary

Problems solved by technology

In order to predetermine the function in this way, not only the setting becomes troublesome, but also if a failure occurs in the communication port for power reception or the network cable connected to the communication port, even if the communication port set for power supply is Yes, there is also the problem of not being able to receive power supply using the communication port used for power supply

Furthermore, as disclosed in Patent Document 1, the connection method of each device is limited to a network structure such as power supply from upstream to downstream, such as a series structure, a radial (hub and spoke) structure, or a combination thereof, and it is difficult to Applicable to problems in network systems where multiple communication ports may be able to receive power, such as a ring-type network structure

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