System Overview
4
TIDUES1A – October 2019 – Revised February 2020
Copyright © 2019–2020, Texas Instruments Incorporated
EMC Compliant 10/100-Mbps Ethernet PHY Reference Design With IEEE
802.3at Type-1 (
≤
12.95 W) PoE-PD
2
System Overview
2.1
Block Diagram
shows the system block diagram for the TIDA-010046 reference design. To demonstrate
combined power and networking over longer Ethernet cable, the major building blocks of this reference
design system are:
Network traffic generator:
IXIA network emulator tool
PSE Side Board or Board-1:
Since this board comprises two Ethernet PHYs (DP83822I and DP83825I)
connected in RMII back-to-back mode and an IEEE 802.3at Type-1 compliant (15.4 W) PSE (TPS23861),
it functions as a PoE Ethernet extender. The PSE is the network PoE element that injects power onto an
Ethernet cable. It may also be an endspan device, such as a PoE-enabled switch, or a single-port or multi-
port midspan PoE injector located between the switch and the PD.
PD Side Board or Board-2:
This board contains an IEEE 802.3at Type-1 compliant PD (TPS23755) and
one Ethernet PHY (DP83825I) to receive power and data both over Ethernet cable. It could be a PoE-
enabled IP phone, a wireless access point, IP network camera or any other IP device that requires power.
Ethernet cable:
Up to 150 m
Laptop:
USB-2-MDIO serial management GUI based tool runs on laptop that allows access to the MDIO
status and control and configuration registers of Texas Instruments' Ethernet PHYs.
