Be sure to remember the choice and use of PoE switches!
Be sure to remember the choice and use of PoE switches!
If you are going to choose or use the PoE switch, these knowledge points must look, you can avoid detours, less trouble.
First, choose what to pay attention to?
1, do not cheap, especially the core of things, you know
The domestic market is flooded with a variety of products, PoE switches are no exception. PoE switches on the market a large number of small brands, price and quality vary greatly. Some people who are in contact with the PoE power supply, as long as the PoE switch on the line, a good point does not matter, so in order to save costs, often more than N choose the lowest price.
Not that cheap is not good, cheap also have good goods, but after all less. In general, the higher the price of a thing, the use of hardware, spare parts, accessories, chips, etc. are high quality, guaranteed, the price is very cheap things, there are many hidden dangers and deficiencies. For the PoE switch, the price is too low may occur in the late use of a lot of problems, such as unstable power supply, power supply, after-sales and other issues can not be carried out.
Want to buy high quality and low price, personally think that the rich PoE switch is also OK, perhaps you can meet the requirements.
2, try to stay away from non-standard
PoE switches are mostly standard, there are a small part of the non-standard. The reason for the existence of non-standard one because of low cost, but because some places can not use non-standard. However, the non-standard PoE switch security risks exist, such as burning the network equipment connected with it. When using non-standard PoE switches, the supply voltage and the voltage of the equipment must be consistent.
Standard PoE switch is relatively safe, and can automatically connect to connect the network equipment, only support PoE power supply network equipment PoE switch will begin to power, protect the safety of the equipment.
3, choose the right model
The PoE switch model, port number 4, 8, 16, 24, a fast and Gigabit transmission rate, power 60W, 96W, 150W, 250W, 400W, need what port number and port transmission rate, need to choose the right.
Remember: the port transfer rate PoE switch utilization rate at about 40~60%, a network if the theory through fast PoE switch, then select Gigabit switch. In addition, the surveillance camera with infrared light like this, we must consider the infrared lamp power.
Two, pay attention to what?
1, the best cable, this dry, used, eat the loss of all know.
The quality of the cable is good or bad for the success of the PoE power supply is generally recommended for the use of five types of cable, more than five types of cable and the cable of the six category. The internal quality of the cable is also very important, do not use any aluminum wire, copper clad aluminum wire, copper wire, iron wire, etc., the use of pure copper wire.
2, at a distance of 80 meters
The theory of PoE power supply at the distance of 100 meters, but given the market access line quality and the influence of environment, the actual use of the power supply to maintain the distance within 80 meters.
Reminder: PoE power supply is just one of many projects, there are many other ways, have their own applicability, no matter good or bad, we can choose according to the project requirements and the difficulty of construction