POE (Power Over Ethernet) is to not make any changes in the existing Ethernet Cat.5 wiring in infrastructure, IP-based terminal (such as IP telephones, wireless LAN access point AP, network camera, etc.) transmit data signals at the same time, but also for such equipment, to provide DC power technology. POE technology to ensure the normal operation of the existing network, minimizing costs while ensuring the safety of the existing structured cabling. POE is also known as the LAN-based power supply system (POL, Power over LAN) or Active Ethernet (Active Ethernet), sometimes also referred to as Power over Ethernet, which is the use of the existing standard Ethernet transmission cable at the same time transfer data and electrical power standards and to maintain compatibility with existing Ethernet systems and users. IEEE 802.3af standard Power over Ethernet system the POE the new standard, it is powered via the network cable directly increase on the basis of the IEEE 802.3 standard, is an extension of the existing Ethernet standard, is the first international standards on the distribution of power. POE Network Camera is powered cable network camera, which means using the POE ip camera, no longer need a separate power supply line. A complete POE system includes two parts of the supply-side equipment (PSE, Power Sourcing Equipment) and Powered Device (PD, Power Device). A PSE device Ethernet client devices powered devices, but also the entire process of POE Power over Ethernet managers. PD device is powered PSE load, that is, the the POE system of client devices, such as IP phones, ip cameras, AP and Pocket PC (PDA) or mobile phone chargers many other Ethernet devices. Advanced network camera in the equivalent of a small computer to its own CPU, memory, and data encoder, some even with native storage interface (SD or USB interface), so the ip camera is the most popular easiest remote monitoring equipment. Very obvious power advantages to using an Ethernet cable, POE only need to install and support a cable, simple and space-saving, and the equipment can be moved; many live equipment such as network surveillance cameras and so need to be installed in places difficult to deploy AC power , POE so that it no longer need expensive power supply and installation of power time-consuming, cost and time savings; POE powered end devices will only need to supply the equipment supply, only connect the equipment needs to be powered, Ethernet network cable will have a voltage is present, thus eliminating the risk of leakage on the line; POE by using the Simple Network Management Protocol (SNMP) to monitor and control the equipment; power to provide the device can also be used for system management, such as the application of the Simple Network Management Protocol (SNMP), this feature can provide, such as night shut down a single UPS can provide all equipment power supply, remote restart functionality; Users can automatically and safely mix original network and POE devices, these devices can coexist with existing Ethernet cable, making it easy to manage network devices, remote ip camera only when the remote control is connected to the network before we can, reconfiguration or reset. General ip camera in addition to the need to transmit video signals through the cable, but also must weather to provide enough power. Real construction often unable to provide a stable power supply and had to re-design the ip camera installation site re-design of the installation location may lead to the monitoring dead ends, so monitoring lose its meaning. POE ip camera is to use POE technology to network video surveillance ip camera with POE powered device side, the use of the PoE supply-side equipment (PSE) provided DC, to a twisted pair transmission electric terminal (PD). POE ip camera has the following advantages compared with ordinary network cameras, from the Ethernet cable for connecting the device to provide a common supply support, POE reduce investment spending, thereby reducing power equipment integrated into a unified IP infrastructure The total cost of deployment. Camera mounting location without power, but power supply or installation location lighting power is unable to provide all-weather supply situation is not uncommon, but in order to make the ip camera is properly installed in the expected location, we must solve the supply problem of inetwork cameras. Since I can not properly provide electricity, we can consider the use of the network cable to the camera power supply than the deployment of a strong wire is much easier, after all, the deployment of a network line, and if the power cable as long as data switch end power without interrupting the network camera can work properly.
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