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On-Demand Webinar:

PoE and Smart Building, with a focus on the new 802.3bt specification requirements

This webinar examines the PoE specifications 802.3af, 802.3at and 802.3bt, with a focus on bt, specifically: Autoclass, Inrush, MPS, LLDP, Single and Dual Signature. A smart building power efficiency use case will be examined. Multiple smart building block diagrams and ON Semiconductor PoE solutions will be highlighted.

Originally presented: August 27, 2019
Duration: 1 hour
Presented by:


The PoE specification is relatively complex and not easily accessible on the web. This webinar extracts the fundamental PoE requirements and presents them in a clear and digestible manner. Isolated vs. non -isolated PoE powered LED drivers, and 25W vs. 70W PoE powered security camera smart building block diagrams are included. Highlights of the webinar include:

  • Advantages Powering Smart Building with PoE
    • Poe Topologies and terms
    • Smart Building Cable Loss Case Study
    • 2pair 4 pair
    • Voltages and DC resistance
  • IEE802.3af Detection and Classification (15W)
  • IEE802.3at Detection and Classification (30W)
  • IEE802.3bt Detection and Classification (90W)
    • Autoclass
    • Inrush
    • MPS (Maintain Power Signature)
    • LLDP (Link Layer Discovery Protocol)
    • Single vs. Dual Signature
  • ON Semiconductor PoE (PD) Product Portfolio
  • Smart Building Application Block Diagram Examples

Key Takeaways

  • Learn the fundamentals of the PoE Specification, including the latest 802.3bt, 90W requirements.
  • Understand the importance of Autoclass, Inrush, MPS, and Single vs. Dual Signature, 2-pair and 4-pair power.
  • Explore PoE Smart Building applications like LED and Security Camera.
  • Learn PoE topologies and terms like; PSE, PD, Endspan and Midspan (injectors) PSE's, and PoE Splitters.
  • Learn about a PoE "Smart Building" Efficiency Use Case.


Bob Card, Americas’ Marketing Manager, Analog Solutions Group (ASG), ON Semiconductor

Bob Card has over 25 years of experience in the Semiconductor Industry, tackling applications like li-ion battery management and charging, USB, wireless/wired communications, SERDES and authentication. Bob is the marketing manager responsible for On Semiconductor's Analog Solutions Group (ASG) for the Americas' region.