DP83822 Energy Efficient Ethernet IEEE 802.3az
The DP83822 10/100Mbps Industrial Ethernet PHY offers a wide range of power saving modes that can be applied individually or in combination with each other depending on the desired operation.
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Energyefficient Industrial Ethernet Adjustable
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EEE, Energy Efficient Ethernet
I recently tested a 48 port switch with all ports connected but with no traffic and saw a decrease in actual power consumption in the switch of ~15%.