Power over ethernet (PoE)

While Power over Ethernet (PoE) has been around for years, the latest standard IEEE 802.3bt increases the maximum power that can be delivered via a twisted pair Ethernet cable. The new standard was ratified in 2018 and opens the door for many new PoE applications.
Power Sourcing Equipment (PSE) now provides up to 100W with 8 different power classes whereas Powered Devices (PD) will have up to 71W available for 100m Ethernet cabling. Among others, the adoption of this new PoE standard depends largely on the capability of being able to increase the power density on the PSE side while maintaining the same form factor.

Infineon has long-standing expertise in power supplies and offers a highly reliable and efficient MOSFET portfolio for the power supply in your PoE designs.

• Power Sourcing Equipment (PSE) is any equipment that is able to provide and source power on the twisted pair Ethernet cable, such as PoE switches, extenders, and injectors. PSE needs to be highly reliable to prevent device failure and ensure uninterruptible operations of connected PD. With 802.3bt Type 3 and Type 4, PoE the power demand for PoE switches significantly increases which will make modifications in power supply design necessary.
  
  
• Powered Devices (PD) include devices powered by PoE such as IP telephones, RFID readers, 5G small cell radio units, Wi-Fi access points, thin clients, IP cameras, conference systems, public address systems or access control units. They need to be power efficient while power density increases and work reliably in the field even under potentially rough conditions for a long time.