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The Secret of Power over Ethernet: Why This Technology Can Change the Network World?
In today's high-tech network environment, Power over Ethernet (PoE) is becoming a key technology, allowing many network devices to transmit data and power simultaneously through a single Ethernet cable. The rise of this technology not only simplifies the equipment installation process, but also improves the flexibility and scalability of the equipment.
Power over Ethernet technology allows network devices to no longer be restricted by power sockets, promoting the development of various applications.
Technical Principles
PoE is based on several standards, primarily built within the IEEE 802.3 specification. These standards have been developed and mature since 2003 and mainly include three technologies: Alternative A, Alternative B and 4PPoE. Alternatives A and B provide different transmission methods. The former uses two sets of data signal pairs to transmit power, while the latter isolates power from data transmission, which makes fault detection more convenient.
With the advancement of technology, 4PPoE technology can transmit power in parallel among all four pairs of twisted cables, which is even more important for applications such as high-performance wireless access points (WAPs) and cameras. In short, the emergence of this technology allows us to clearly foresee how the future online world will work.
Standards Development
The earliest PoE standard IEEE 802.3af-2003, also known as Type 1, can provide a maximum of 15.4W of DC power per port. As demand increases, IEEE 802.3at-2009 (Type 2) also provides higher power in subsequent updates. In 2018, IEEE 802.3bt introduced Category 3 and Category 4 standards, supporting maximum power of 51W and 71.3W respectively.
The gradual evolution of these standards not only meets market demand, but also provides sufficient resources for powering the next generation of devices.
Application scenarios
When it comes to the application of PoE, its practicality can be seen in all walks of life. The technology can be found in everything from VoIP phones, IP cameras, wireless access points to small network switches. Especially in monitoring systems, power stability and instant data transmission are crucial to ensuring safety.
In addition, the convenience of PoE also enables it to provide power supply support for sound systems in special occasions such as theaters and public venues, and even plays an important role in the application of outdoor wireless transmission equipment.
Future Trends
As the demand for higher power and more efficient devices increases, PoE technology continues to evolve. In the future, when smart devices are everywhere, people will increasingly rely on PoE to meet the needs of various applications.
Even so, the technology faces challenges. Critics argue that PoE is less efficient than traditional AC power, especially when using long cables, where power loss becomes a factor that cannot be ignored.
SummaryHowever, supporters point out that a centrally powered setup offers significant advantages in terms of system simplification and improved energy efficiency when users centrally manage multiple AC adapters.
In summary, as an innovative technology, Power over Ethernet not only has the potential to promote the evolution of equipment, but is also an indispensable part of the daily operation of network systems. In the balance between convenience, efficiency and flexibility, PoE shows extremely high value. As more new devices emerge in the future, how will PoE evolve to meet changing needs?
