Simple understanding of Poe and UPS Technology

- POE：

• POE Also known as LAN based power supply system (PoL, Power over LAN ) Or active Ethernet ( Active Ethernet), Sometimes referred to as Ethernet power supply .POE (Power Over Ethernet) In the existing Ethernet Cat.5 Without any changes to the cabling infrastructure , For some people based on IP Terminal （ Such as IP telephone 、 WLAN access point AP、 Webcam, etc ） While transmitting data signals , Technology that can also provide DC power supply for such equipment .POE Technology can ensure the safety of the existing structured cabling and the normal operation of the existing network , Minimize costs .
• The standard category 5 network cable has four pairs of twisted pair , But in 10M BASE-T and 100M BASE-T Only two of them are used in .IEEE802.3af Two usages are allowed , When applying idle pin power ,4、5 The pin connection is positive ,7、8 Pin connection is negative . If the rated current of the equipment is large , The current of a cat. 5 network cable cannot reach the rated current , It can be powered by connecting the idle pin of the multi-channel network cable .

- Incidentally, there are several common types of network cables ：

• Class V network cable ： Cat 5 cable supports 100 megabit transmission rate , The maximum transmission rate is 100Mbps.
• Super category 5 network cable ： The network cables circulating in the market are generally super five types ; Compared with the five types of network cables , The attenuation of super class 5 network cable is smaller , Better anti-interference ability .
• Category VI network cable ： Support Gigabit Network , Often called “ Gigabit network cable ”; Class VI line provides 200MHz Comprehensive attenuation to crosstalk ratio and overall 250MHz The bandwidth of the ; Cat 6 cable is mainly used in Gigabit Networks , The transmission performance is much higher than the standard of super class 5 network cable .
• Cat 6 network cable ： Cat 6 network cable is an improved version of Cat 6 cable , The maximum transmission rate can reach 1000Mbps; Relative to class VI line , In crosstalk 、 attenuation 、 The signal-to-noise ratio has been greatly improved .
• Seven kinds of lines ： Cat 7 wire is a kind of shielded twisted pair , It is mainly used for 10 Gigabit Network , Transmission rate up to 10Gbps; Middle of class VII line , Each pair has a shielding layer , Four pairs of wires together have a common shielding layer , The appearance is much thicker than the common network cable .

- UPS：

• UPS Uninterruptible power supply (Uninterruptible Power Supply), It is an uninterruptible power supply with energy storage device . It is mainly used for supplying power to some equipment that requires high power stability , Provide uninterrupted power supply . When the current input is normal ,UPS Supply the current to the load after stabilizing the voltage , At this time UPS It's an AC voltage regulator , At the same time, it also charges the battery inside ; When the current is interrupted （ The accident was cut off ） when , UPS Immediately turn the DC power of the battery , Continue to supply power to the load through inverter switching 220V Alternating current (ac) , Keep the load working normally and protect the load soft 、 The hardware is not damaged .UPS Equipment usually provides protection against high or low voltage .