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Power over Ethernet (PoE) technology

        With the IP telephone network, network video surveillance and wireless Ethernet applications more and more extensive power over Ethernet support itself more and more pressing demands. Since in most cases, AP (wireless access point, Access Point) required to supply DC power, while the AP is usually installed at a relatively high distance from the ground (such as the ceiling, etc.), the vicinity of hard to have a suitable power outlet, even if there is socket, AP required the resettlement of AC-DC converter so that there is also a headache for network administrators. Moreover, a lot of large-scale wireless LAN applications, administrators need to manage simultaneously a number of AP, they also need to standardize the AP and unified management of supply, Power over Ethernet (PoE) to solve the problem. Principles of PoE devices are unshielded twisted pair through four pairs of lines in the two pairs of lines to transmit power, transmit data at the same time the DC transmission. AP because often require the use of an uninterruptible power supply (UPS) supply of electricity, the use of PoE devices, AP only through the end of an RJ-45 cable and network connections that can transfer data and power simultaneously, the use of PoE devices, therefore, all The AP is using a UPS in the protection of PoE end devices. If you do not use PoE equipment required for each AP on with a UPS, but also need to install the power outlet near the AP, an increase of cost. Therefore the use of PoE equipment will greatly reduce the equipment costs and management costs. IEEE 802.3af specification defines a permit through the Ethernet cable DC power transmission method

    In June 2003 finally approved IEEE standard 802.3af. The standard defines a permit transmission of data through the Ethernet at the same time in DC power transmission methods. This method used to build the power supply equipment and electrical equipment, including unshielded twisted-pair on the 48v transmission cables used in existing devices, such as type 5/5e/6 cable, patch panel, output connecting hardware. It is safe, reliable manner PoE technology into existing network infrastructure and the existing network and compatible devices. PoE via a single cable, not only provides network connectivity, also provides the necessary power supply equipment. This means that the terminal at the workstation, no need to give more power equipment and add the cost of a higher AC. This network equipment can be powered directly through the Ethernet connection without the use of the wall AC power outlet, thereby greatly simplifying the wiring, and make management more flexible, while reducing power generated as a result of the laying of the network infrastructure construction costs . In addition, from the reliability point of view, the adoption of a centralized power management system to enhance reliability and prevent power overload, power-down, surge and spike. Concentrated solution simplifies power distribution, and support the deployment of centralized UPS, thereby greatly reducing the business interruption. PoE obvious advantages of PoE has a very distinct advantage, as follows:

    ● simplify installation, reduce costs, not for each separate data network equipment and power cables.

  ● improve flexibility, network devices can be installed in any location without the need has existed for close to a power output.

  ● reliability enhanced PoE capabilities have SNMP devices, can be put into effect long-range detection and control, can effectively deal with or repair the power plant and (or) Failure.

   In accordance with the 802.3af standard, Ethernet is defined as the power in the ISO11801: 2002 standards at the same time on the cabling system to provide low-voltage and Ethernet data.

    At present, PoE can provide some equipment (such as VoIP phones, wireless network access points, network security devices and more equipment) to provide power. Principles of PoE devices are unshielded twisted pair through four pairs of lines in the two pairs of lines (4 / 5 and 7 / 8) to transmit, in the transmission of data transmission as well as DC. 802.3af standard PoE implementation defines two methods: one for the "End-Span", another for the "Mid-Span". The former is used to transmit data simultaneously on transmission DC cables, the signal frequency and the Ethernet data signals of different frequencies, and its equipment in support of PoE Ethernet switches, routers, hubs or other network switching equipment , the replacement cost of the equipment of these networks is relatively high. While the latter are not using the LAN cable used to transmit the line of DC, because in Ethernet, only four pairs of cables used in the two pairs of lines to transmit data. Its support equipment are used to add Power over Ethernet functionality to an existing network equipment, so this method do not have to replace network equipment, simply on the basis of the existing network to add the relay equipment and the jumper .

Shenzhen acorid co.,ltd supply LRE&POE together switches