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POE (Power Over Ethernet) refers to some IP-based terminals (such as IP phones, wireless LAN access points APs, network cameras) without any changes to the existing Ethernet Cat.5 cabling infrastructure. Etc.) While transmitting data signals, it is also possible to provide DC powered technology for such devices.
POE technology can ensure the normal operation of existing networks while ensuring the safety of existing structured cabling, and minimize costs.
1 POE power supply principle
To understand twisted-pair transmission friends, you should know that the standard Cat5 cable has four pairs of twisted pairs, but only two of them are used in 10M BASE-T and 100M BASE-T. IEEE802.3af allows two uses. When the idle pin power is applied, pins 4 and 5 are positive, and pins 7 and 8 are negative.
When the data pin is used for power supply, the DC power supply is added to the midpoint of the transmission transformer and does not affect the data transmission. In this way the pairs 1, 2 and the pairs 3, 6 can have any polarity.
2 What are the advantages of using POE switches in the monitoring system?
1, power transmission up to 100 meters, convenient wiring
With PoE technology, PoE switches can provide network equipment with a distance of up to 100 meters, making wiring a breeze. Especially suitable for millions of HD monitoring systems, not only can improve the image of the project, but also significantly reduce the cost of installation.
2, security monitoring field, compatible with all kinds of network switches
PoE switches are compatible with network cameras and are mainly implemented in two aspects. The first is PoE power supply. The PoE switch adopts the international standard IEEE802.3af/at design and adopts the industry-leading 8-wire end-to-end power supply method of the network cable (1236 and 4578 line sequence can be simultaneously powered), reducing the loss of more than half of the network cable material compared to similar products, and delivering the power at the end. Higher, farther driving distance. Perfectly suits PoE function settings of common cameras.
3, multiple heat dissipation design, improve stability and prolong product life
PoE switch products consume more power than ordinary switches and the chip generates more heat. Therefore, an excellent heat dissipation solution is an important guarantee for the stability of PoE switches.
4, powerful data processing capabilities to ensure the stable operation of the network
The backplane bandwidth of the switch is the maximum amount of data that can be processed between the switch interface processor/interface card and the data bus. It marks the total data exchange capacity of the switch. The higher the backplane bandwidth of a switch, the stronger the ability to process data, but at the same time the higher the design cost.
3 Comparison of PoE and Traditional Power Lines
The traditional power line supply is good, but it cannot adapt to the rapid development of network monitoring. With the construction of the safe city, surveillance cameras are spread all over the streets, such as intersections, shopping malls, hotels, supermarkets, schools, KTV, etc. They have a huge number. How to supply them with continuous and stable power supply is a very troubling thing. In this case, a PoE switch can handle it. The network monitoring transmits data through the network cable. Through the PoE switch, the network cable can transmit data and power at the same time. It can be used for both front-line and dual-use, without wiring, without power sockets, and it can supply power to countless cameras.
The use of PoE switches not only eliminates the need for power wiring, but also has many other advantages, such as freedom from wiring restrictions, more flexible networking, saving manual construction costs, no more power and more secure, convenient maintenance and management of the latter period, smart power supply guarantee The safety of powered devices is more environmentally friendly and energy-saving.
4 How to select a POE switch
The small-scale monitoring system can use one or several PoE switches to achieve stable power supply; medium and large-scale monitoring systems use switch cascading, that is, access switches, convergence switches, and core switches are respectively selected. In fact, no matter what kind of network monitoring system, as long as the PoE switch is selected correctly, it can provide stable power supply, and the transmission of video streams is also smoother.