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  • Analysis of PoE technology in the security network cameras


        With the widespread use of network cameras, as a practical and efficient power transmission, Power over Ethernet (PoE) technology - this function can not be used in the analog monitor, allows IP network equipment powered through PoE switch through the same cable to transmit IP data without specialized deployment of the cable to provide power to simplify installation of IP cameras, reducing installation and maintenance costs, and improve the stability of the IP video surveillance system - with its This advantage, PoE Network Camera formal the Mairu An anti-stage and the strong concern of the market.
        The concept of POE
        Of POE (Power Over Ethernet) refers to the existing Ethernet Cat.5 wiring of infrastructure does not make any changes in the case of IP-based terminals (such as IP telephones, wireless LAN access point AP, the network cameras, etc.) and transmit data signals at the same time, but also to provide the DC power supply technology for such devices. POE technology can guarantee the normal operation of the existing network while ensuring the safety of the existing structured cabling, minimizing cost.
        POE is also known as a LAN-based power supply system (POL, the Power over LAN), or Active Ethernet (Active Ethernet) is also sometimes referred to as Power over Ethernet, which is the use of the existing standard Ethernet cable simultaneous transmission of data and electrical power of the latest standard specification, and to maintain compatibility with existing Ethernet systems and users. IEEE802.3af standard is based on the new standard for Power over Ethernet POE, it a IEEE802.3´s based on the relevant standards are powered directly through the network cable is an extension of the existing Ethernet standard, is the first With regard to the international standard for power distribution. The advantages of using Ethernet cable power supply is obvious:
        POE only need to install and support a cable, simple and space-saving, and the device can be moved.
        Cost savings. Number of energized equipment, such as surveillance cameras and so needs to be installed in difficult to deploy AC power of POE eliminates the need for expensive power supply and installation of power-consuming, cost and time savings.
        Data transmission, POE can use the Simple Network Management Protocol (SNMP) to monitor and control the device. Power supply device can also be to provide a system management capabilities, such as application of the Simple Network Management Protocol (SNMP). This function can be provided such as night shutdown, remote restart and the like function.
        POE power supply side equipment will only need to supply equipment supply, only to connect the devices to be powered Ethernet cable will have a voltage is present, thus eliminating the risk of leakage on the line.
        A single UPS can provide the supply of all equipment in a power outage.
        The user can automatically and safely on the network mix of original equipment and POE devices, these devices can co-exist with the existing Ethernet cable.
        Easy to manage network devices. Because the remote device connected to be able to remote control, reconfiguration or reset.
        Wireless LAN, POE can be simplified RF testing tasks, and access points can be easily moved and access.
        POE technology in the network monitoring
        We all know, the network camera in addition to the need to transmit video signals through a network cable, must also weather to provide enough power. In the real construction, often because they can not provide a stable power supply, but had to re-design of the camera installation site. As a result, the design re-installation site amount may result in appeared monitoring corners, so that the monitor lost its meaning.
        Camera installation location without power supply or installation position of power but it is the lighting power, and can not provide all-weather supply, this is not uncommon, but the crux of the problem is the supply of network cameras. To make the network cameras installed correctly, we must solve the supply problem of the network camera in the expected location. Since I can not provide electricity, we can consider using a network cable to the camera power supply, after all, the deployment of a cable´s much easier than the deployment of a strong wire, and, if you use a network cable, power supply, as long as the power of the data switch side interruption, the IP camera can work properly.
        POE Network Camera is the use of POE technology to network video surveillance network camera with POE powered device side, the use of supply-side of the Power over Ethernet equipment (PSE) to provide DC, through the twisted pair transmission power end (PD). Compared with the normal network cameras, POE Network Camera has the following advantages: in addition to provide a common power supply support from the Ethernet cable to connect devices, POE reduces investment spending, thereby reducing integration into the electrical equipment in a unified IP infrastructure The total cost of deployment.
        Of course, it is important to note that the PoE standard to support up to 15.4W, common network camera is enough. However, for actions that can detect moving objects, steering and zoom PTZ IP camera, it needs electricity to work properly in 20-30W, PTZ IP cameras with power output up to 30W of PoE + standard support. Of course, now has many of the latest PoE switches support PoE + standard.
        POE technology can guarantee the normal operation of the existing network while ensuring the safety of the existing structured cabling, minimizing cost. It can be foreseen that with the increasing market share of network cameras in the security field, POE technology will also be in its simplified wiring and flexible, energy-saving, safety and convenience advantages are widely used in the field of network monitoring.

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