2018年9月に承認された「IEEE 802.bt」

　Power over Ethernet (PoE: Power Over Ethernet) is IEEE 802.3AF and IEEE 802.It is a network function defined by the 3AT standard.With PoE, the Ethernet cable allows you to supply power and data to the network device at the same time via the existing data connection.

　In addition, on September 27, 2018, IEEE 802.3BT (hereinafter, 802.The 3bt) standard has been approved by the IEEE-SA Standardization Committee, and the power that can be transmitted via an Ethernet link has increased significantly.This article describes the reason why this standard is important and the possibility of this standard.

　Why are wireless network architectures available right away, but are they still using wired connections?Certainly, wireless connection is convenient, but there are millions of miles and existing wired CAT5E cables in buildings and homes.

　Wired wires are more difficult to hack and intercept than wireless (most of the corporate networks such as universities are wired), and even long cables are quite low cost, so wired connections are still active.

　However, if the building is made of lotus, stone, or metal, it is often "lucky" to be able to obtain a good wireless signal (5G [5th generation mobile communication]).The range of reach will be improved, but it will not be possible to fully deploy it for the time being).If you want to access the Ethernet cable signal, you need to cut the cable.Furthermore, wireless may be easily interfered with other signals and wireless radio waves, but wired cables are often shielded, so they can be "plug -and -play", so service quality (QOS) has a service quality (QOS).Improve.

　802.The 3BT system architecture uses a power controller (PSE) that supplies power to the power receiving device (PD) via an Ethernet cable.

　802.3BT has the following description:

　"PD is part of a device that obtains or requests power by joining the PD detection algorithm. PD devices may have a function to obtain power from alternative power. Power interface.PDs that require power from (Pi) may also get power from alternative power at the same time. "

　The standard PD receives power from the Ethernet cable for IP phones, wireless access points, surveillance cameras, etc.Power interface (Pi) is a mechanical and electrical interface between PSE or PD and transmission medium.This is 802.In 3BT, section 1 of "PD Pi Current Definition" 1.4.It is defined in 324.

　Previous PoE standards used only four of the eight copper wires of the Ethernet cable to supply DC current, but the IEEE work group was 802..In 3BT, I chose to use all eight copper wires.802.The 3BT-2018 correction draft 2 is described as follows.

　"This amendment adds a power supply that uses all four pairs in the structured wiring equipment, which allows the terminal device to supply larger power.Add a mechanism to reduce the standby power consumption and manage the available power budgets more appropriately. "

　The IEEE standardization committee had the goal of "increasing the amount of power supplied to the power receiving device (PSE) to the power receiving device (PD)".These nominal power levels supplied to PD are up to 71.It is 3W (power supply from PSE to 90W) and greatly reduces the standby power required for PD at the same time.