what is class 6 or class 4 High-Power PoE Standard

 Power over Ethernet (PoE) is a technology that combines both data signals and electrical power into a single Ethernet cable connection to enable remote powered device operation. By eliminating the need for separate data and power cables, PoE provides the advantages of simplicity and cost savings.

In 2003, IEEE published the 802.3af standard, which outlined the characteristics of Power over Ethernet (PoE) at up to 15.4 W of DC power, running over 10BASE-T and 100BASE-T. Power was delivered over two of the four twisted pairs on Cat 3 cabling or higher.

 In 2009, IEEE introduced 802.3at, also known as the “PoE+” standard. This update allowed for the delivery of up to 30 W, and supported 1000BASE-T over CAT 5 or 6. It also limited power delivered over two of the four cable pairs. While PoE+ switches support devices that require higher power, they can also detect devices requiring 13 Watts or less and deliver the appropriate level of power required. 

In 2013, IEEE announced the study group for creating 802.3bt, which defined PoE over four pairs and includes support for 10GBASE-T, 5GBASE-T, and 2.5GBASE-T over CAT5e or higher. 

The IEEE 802.3bt standard was finalized in September of 2018 and defines two types of PoE:

• Type 3 which supports up to 60 Watts 

• Type 4 which supports up to 90 Watts 

This new technology uses all 4 pairs in an Ethernet cable to deliver power and data over the same medium. 

APPLICATIONS FOR HIGH POWER POE 

Applications for Power over Ethernet continue to grow as the technology and standards advance. Emerging applications that are poised to take advantage of new higher power wattage needs at the access layer include: 

• Building infrastructure such as LED lighting 

• Retail POS systems and digital signage 

• High Performance Wireless Access Points

• High definition pan-tilt-zoom security cameras with heaters for harsh environments