About the IEEE802.3bt standard


Recently, the IEEE802.3bt standard has finally been approved. The newly approved IEEE 802.3bt standard is aimed at the rapidly growing market demand and driving force, laying the foundation for the steady growth of the Power over Ethernet (PoE) market.

​Brief history of PoE development

PoE is called Power Over Ethernet, and PoE is also called LAN-based power over LAN (PoL, Power over LAN) or Active Ethernet. Sometimes it is also referred to as Power over Ethernet. The Ethernet transmission cable meets the power application requirements of power supply while transmitting data, and maintains compatibility with existing Ethernet systems and users.

Power over Ethernet (PoE) has become an important power strategy in the past decade. Based on this technology, network administrators, installers and integrators can use structured cabling to provide power and data to many network devices. With the rapid development of new services such as WLAN, VoIP, and network video surveillance, POE power supply has gradually become mainstream, but with the emergence of high-power applications for equipment, it is clear that 30W power supply power is difficult to meet demand.

Power is supplied through 10BASE-T, 100BASE-TX, 1000BASE-T Ethernet networks. The reliable power supply distance is up to 100 meters, and 10BASE-T1 can reach 1000 meters. In this way, remote centralized power supply can be provided for devices such as IP phones, IP cameras, wireless APs, and data collection terminals, without the need to consider the wiring of their power systems. In terms of versatility, as long as the current PoE power supply system complies with the IEEE 802.3 standard, it can solve the problem of adaptability between power supply and powered devices of different manufacturers.

With the advent of the IEEE802.3bt standard PoE switch, the power supply capability has been continuously enhanced, which can not only meet PoE equipment (including electric surveillance cameras, video phones, high-definition displays, and low-power intelligent building equipment such as controllers, sensors, and actuators), etc. And, it can meet the retail store business point (POS), video conference terminal point, public area communication terminal, building controller and sensor setting position, multi-channel wireless AP setting position, smart terminal device setting position, etc.

IEE802.3bt most noteworthy points

The arrival of IEEE 802.3bt heralds a new era of strong market opportunities for PoE technology, and the standard is a solid foundation for expanding the Ethernet Alliance's PoE certification program. One of the innovations is still very interesting:

First: IEEE 802.3bt triples the maximum power of power supply equipment (PSE), from 30 W to 90 W, and increases the power level of power consumption equipment (PD) to 71.3 W.

Second: IEEE 802.3bt will increase the number of supported levels from 4 to 8 for Type 3 and Type 4 Power Supply Equipment (PSE) and Powered Equipment (PD) for 4-90 W and 3.84-71.3 W, respectively.

Third: The IEEE 802.3bt standard provides many new features and functions, such as support for efficient 4-wire pair power transmission, and channel definitions that support 2.5 Gbps, 5 Gbps, and 10 Gbps PoE operation.

Insider reviews

Driven by the increasing popularity of IEEE 802.11ac wireless access points and various new applications including network-attached storage, building automation, security, entertainment, etc., the demand for PoE-enabled switch ports is expected to soar to new heights "It is expected that port shipments will reach 850 million in the next five years," said Tam Dell'Oro, CEO of Dell'Oro Group. "As power transmission capacity increases, coupled with cost-effectiveness, flexibility and scalability In addition, PoE has developed into a highly competitive solution for enterprises and consumers. "

"The IEEE 802.3bt standard is cleverly designed to facilitate the rapid expansion of a range of PoE use cases," said John D'Ambrosia, Chairman of the Ethernet Alliance. Helps to lay a network that will never be outdated. As the number of levels of the IEEE 802.3bt standard and the scope of use cases increase, there must be an effective way to easily identify which powered devices (PD) and powered devices (PSE) can be coupled in Together, this is where the Ethernet Alliance's second-generation PoE certification program comes in. This program helps promote interoperability among multiple vendors by providing a fast and easy way to intuitively identify compatible products Make sure users get the full benefits of current and future PoE solutions. "