Energy Efficient Ethernet (EEE), defined by IEEE 802.3az, is a capability integrated into Layer 1 (Physical Layer) and Layer 2 (Data Link Layer) to operate in Low Power Idle (LPI) mode. In LPI mode, power is saved during periods of low packet utilization. EEE defines the protocol to enter and exit LPI mode without dropping the link or corrupting packets. The transition time into and out of LPI mode is short enough to be transparent to the upper layers within the OSI model.
The DP83822 EEE supports 100 Mbps and 10 Mbps speeds. In 10BASE-Te operation, EEE operates with a reduced transmit amplitude that is fully interoperable with a 10BASE-T PHY.