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Power Over Ethernet (PoE)

Power Over Ethernet (PoE)

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Current Mode PWM Controller PD-Power Controller Hot Swap DC/DC Down Converter Power Source Equipment (PSE) PD-PoE Controller + Converter PD System Power Microcontroller

Design Considerations

Power Over Ethernet (PoE)

Power over Ethernet is a technology specified in the IEEE 802.3af standard, which integrates data and power over standard LAN infrastructure. It provides reliable, uninterrupted 15W max (13W load), 48V nominal supply to the devices connected to the Ethernet using existing, commonly used Category 3 (4 pairs) and Category 5 cable infrastructure.

The Core Subsystems include:

  • Power Source Equipment (PSE) Controller
     - detects, classifies, and supplies (PD detection algorithm) power to the devices at the other end of the ethernet cable.
     
  • Microcontroller
    - controls and monitors the PoE ports and power supply unit.
     
  • Powered Device (PD) Controller
     - draws or requests power by participating in the PD detection algorithm.
     
  • Power Supply
     - 48VDC Uninterrupted Power Supply unit (UPS).
     
  • Power Management
     - converts input power from the ethernet cable to run various functional blocks on the powered devices.

Application Notes

Most useful technical documents for Power Over Ethernet (PoE) Help

     

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