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Detailed Knowledge Of Poe Power Supply

With the rapid development of IP phones, wireless LAN access points, and network monitoring in recent years, the technical threshold has become higher and higher, and the technical support provided by manufacturers has become more comprehensive and systematic. In technical exchanges, one of the most perplexing problems for engineering companies is the problem of POE power supply. PoE Injector manufacturer shares with you:

Question 1: What is PoE technology?

PoE (Power Over Ethernet) refers to the existing Ethernet Cat.5 cabling infrastructure without any changes, for some IP-based terminals (such as IP phones, wireless LAN access points AP, network cameras Etc.) While transmitting data, it can also provide DC powered technology for such devices. PoE technology can ensure the normal operation of the existing network while ensuring the safety of the existing structured wiring, and minimize the cost.

A complete PoE system includes two parts: Power Supply Equipment (PSE) and Powered Device (PD).

Power Supply End Equipment (PSE): Ethernet switch, router, hub or other network switching equipment supporting POE function

Powered Device (PD): Wireless APs are mainly wireless APs

Question 2: Is the PoE power supply stable?

From a technical point of view, the technology of PoE has developed for many years and is currently in a very mature stage. However, due to the pressure of cost in the current monitoring market, the quality of the PoE switch or cable used is too low, or the design of the scheme is unreasonable, resulting in a particularly heavy workload for the maintenance of PoE-powered projects. Therefore, PoE power supply for engineering companies is widespread Stable view.

In the case of very large data transmission volume, high power, and uninterrupted work around the clock, the use of quality-assured PoE equipment and wires is a guarantee for the stability of the entire system.

Question 3: What are the advantages of the PoE power supply solution?

1. Simplify wiring and save labor costs

One network cable transmits data and power at the same time. PoE eliminates the need for expensive power supplies and the time taken to install power supplies, saving costs and time.

2. Safe and convenient

poe supplier only supplies power to the equipment that needs to be powered. Only when the equipment that needs to be powered is connected, the Ethernet cable will have a voltage, thus eliminating the risk of leakage on the line. Users can safely mix legacy and PoE devices on the network, and these devices can coexist with existing Ethernet cables.

Industrial Poe

Industrial Poe

3. Facilitate remote management

Like data transmission, PoE can monitor and control the device by using Simple Network Management Protocol (SNMP). This function can provide functions such as night shutdown, remote restart and so on.

Question 4: What are the risks or disadvantages of PoE power supply technology in engineering applications?

1. Insufficient power, the receiving end does not move: 802.3af standard (PoE) output power is 15.4W. For high-power front-end equipment, the output power cannot meet the requirements.

2. Risk is too concentrated: Generally speaking, one PoE switch will supply power to multiple APs at the same time. Any failure of the POE power supply module of the switch will cause all equipment to fail to work and the risk will be too concentrated.

3. High equipment and maintenance costs: Compared with other power supply methods, PoE power supply technology will increase the workload of after-sale maintenance. In the sense of safety and stability, the stability and safety of independent power supply is the best.

Question 5: How to choose a PoE switch?

1. How much power is required to power the device: The output power of the PoE switch will be different according to different standards. For example, the maximum power of IEEE802.3af does not exceed 15.4W. Due to the loss of transmission wires, the maximum power consumption can not exceed 12.95W. Powered by your device. A PoE switch that complies with the IEEE802.3at standard can supply power to devices with a maximum power consumption of less than 25W.

2. How many devices can be powered at most: An important indicator of the PoE switch is the total power of the PoE power supply. Under the IEEE802.3af standard, if the total PoE power of a 24-port poe switch reaches 370W, then it can supply 24 ports (370 / 15.4 = 24), but if the single port according to the IEEE802.3at standard is the largest The power supply is calculated at 30W. At the same time, it can only power up to 12 ports (370/30 = 12).

3. Need the number of interfaces, whether with fiber port, with or without network management, speed (10/100 / 1000M).

Industrial poe has high requirements on the wire. It is recommended not to save costs on the wire.