SNVAA25A January   2022  – July 2022 DP83TD510E , ESDS302 , LM5155 , LM66100 , MSP430FR2476 , TL431LI , TLV3012

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 10BASE-T1L (IEEE 802.3cg) PoDL Overview
    2. 1.2 PoDL PSE Types and Power Classes
  4. 2Terminology
  5. 3PD Design
    1. 3.1 PD Design Overview
    2. 3.2 Coupling and Decoupling Network (CDN)
    3. 3.3 VID Circuit
    4. 3.4 SCCP Communication
    5. 3.5 Protection Features
    6. 3.6 Power and Scalability
  6. 4References
  7. 5Revision History

1.2 PoDL PSE Types and Power Classes

Consider the IEEE 802.3cg standard as the 10BASE-T1S/10BASE-T1L and PoDL amendment to the IEEE 802.3bu standard which applies to 100BASE-T1 and 1000BASE-T1. The IEEE 802.3bu standard defined 4 types of PSEs Type A, Type B, Type C, and Type D. The standard also defines 10 different power classes for PDs and PSEs including 12-V, 24-V and 48-V unregulated and regulated PSE classes. The IEEE 802.3cg standard extended this by introducing type E and adding 30 V and 58 V classes bringing the total to 15 different compliant classes. Table 1-1 and Table 1-2 detail the complete type and class power matrices.

Table 1-1 PoDL PSE Type Matrix
TypeABCDE
10BASE-T1SXX
10BASE-T1LX
100BASE-T1X
1000BASE-T1XX
No data or incompatibleX
Table 1-2 PoDL Class Power Requirements Matrix
Class0123456789101112131415
VPSE(max) (V)18181818363636366060303030585858
VPSE_OC(min) (V)614.414.412122626484848302020505050
VPSE(min) (V)5.65.7714.414.411.711.726264848202020505050
IPI(max) (mA)101227249471973392154617351360922496322316001579
Pclass(min) (W)0.5661.313.596.791.143.975.591235.365.31.854.812.6311.543079
VPD(min) (V)4.944.411210.610.38.8623.321.740.836.7141414353535
PPD(max) (W)0.51351351030501.233.28.47.72052
Note: The standard specifies mandatory detection protocol for each type and power class without if SCCP communication is not implemented between the PSE and PD.

This document focuses on the design considerations of a class 12 10BASE-T1L compliant PD.