IEEE 802.3 is a collection of IEEE standards defining Ethernet, a widely used computer networking technology. It defines the physical layer and the data link layer's media access control (MAC) of wired Ethernet networks. This includes specifying cabling, data transmission speeds, and frame formats. It is commonly used for local area networks (LANs) allowing devices to communicate within a building or campus. Different variants of 802.3 define Ethernet speeds ranging from 10 Mbit/s to 400 Gbit/s and beyond. It has evolved to include technologies such as Power over Ethernet (PoE) allowing devices to receive power over the same Ethernet cable used for data.
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