Development of POE Technology

- Jul 13, 2019-

In the construction of WLAN, due to the large number of wireless AP deployment, the complex implementation conditions of access deployment location and power supply mode, different requirements are put forward for local power supply and network extension of operators. At present, AP power supply mainly includes three modes: AP local power supply, POE remote power supply and ONU supporting POE.

(1) In the early construction of WLAN, because of fewer services and terminals, a single user group and a small number of AP, it is an effective way to get local power (or through power supply module). With the acceleration of WLAN construction, the number of AP deployments has increased dramatically, and different application scenarios put forward different requirements for AP deployment location. AP usually needs to be deployed to the ceiling, walls or even outdoor and other special places. It becomes very difficult for AP to access power near the network. Because of the addition of a fault point in the network structure, it is impossible to centralize the local access. Network management.

(2) Because of the high failure rate, complex network structure and the inability to realize intelligent network management and power supply function in the early local power supply module mode, this kind of network mode can not meet the requirement of building WLAN in large quantities at the present stage. It is the most mainstream application mode for operators to apply POE technology to Ethernet switch and provide remote intelligent power supply. A complete POE system includes two parts: Power Souring Equipment (PSE) and Power Device (PD). PSE equipment supplies power to the Ethernet terminal equipment, and is also the manager of the whole POE Ethernet power supply process. The PD equipment receives the PSE load of power supply. Based on IEEE802.3af standard, the connection situation and equipment type of the receiving terminal device PD are established between PSE and PD devices. PSE supplies power to PD through Ethernet. POE switching opportunity automatically detects the PD devices, and decides whether the power distribution of the device is optimal or not according to the current power supply port priority configuration and port power configuration. In the first step, while providing data transmission, the intelligent power supply for the PD device can solve the problem of wiring and centralized management to a great extent.

(3) In recent years, with the construction of PON access network for major operators, equipment manufacturers have proposed to integrate POE functions into ONU devices, and introduced ONU supporting POE functions. Although ONU is highly integrated and the solution network level is concise, due to its late launch, fewer supporting vendors, higher price and less consumption in the deployment of operators, its environmental adaptability and AP compatibility need to be fully verified in practical applications.

SHENZHEN OPTFOCUS TECHNOLOGY CO., LTD. After more than ten years of development, from the initial optical transceiver to a series of optical transmission products, including PoE switch, industrial switch, EPON system, optical fiber switch and guideway industrial switch, optical fiber transmission access equipment. Products are all over the country, in public security, radio and television, telecommunications, banking, real estate, power and energy, rail transit, highway, bridge, tunnel, airport and other network systems have been widely used. And relying on strong technical strength, stable product performance, good after-sales service and mature system solutions have been widely recognized by the market.

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