Overview of 802.3bt - Power over Ethernet standard

Lennart Yseboodt, Philips Lighting
David Abramson, Texas Instruments
April 2018

Contents
1 Introduction 7
2 System overview 8
2.1 Power Interface
2.2 Class
2.3 Device Types
2.4 Cable / link section requirements
2.5 2-pair and 4-pair powering
3 Detection 14
4 Connection check and PD signature configuration 16
4.1 Single-signature PD configuration.
4.2 Dual-signature PD configuration
4.3 Requirements to provide 4-pair power
5 Classification 20
5.1 Classification terminology
5.2 Class probing
5.3 Mutual identification
5.4 Data Link Layer Classification.
6 Autoclass 28
6.1 PSE Autoclass requirements .
6.2 PD Autoclass requirements
7 Inrush 31
7.1 PSE inrush
7.2 PD inrush
8 Operating power 34
8.1 PD power limits
8.2 PSE power
8.3 Powering configurations.
9 Current unbalance 41
9.1 PSE current unbalance
9.2 PD current unbalance.
10 Maintain Power Signature (MPS) 43
10.1 PSE MPS measurements.
10.2 PD MPS design consideration
11 LLDP Power over Ethernet TLV 49
11.1 Power via MDI Measurements TLV

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