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IEEE 802.3 is a working group and a collection of standards defining the physical layer and data link layer's media access control (MAC) of wired Ethernet.The standards are produced by the working group of the Institute of Electrical and Electronics Engineers (IEEE).
On May 14, 2018, the PAR for the IEEE P802.3ck Task Force was approved. The scope of this project is to specify additions to and appropriate modifications of IEEE Std 802.3 to add Physical Layer specifications and Management Parameters for 100 Gbit/s , 200 Gbit/s , and 400 Gbit/s electrical interfaces based on 100 Gbit/s signaling.
In May 2018, IEEE 802.3 started the 802.3ck task force to develop standards for 100, 200, and 400 Gbit/s PHYs and attachment unit interfaces (AUI) using 100 Gbit/s lanes. [24] The new standards were approved in September 2022.
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Later Type 3 and Type 4 were introduced in IEEE 802.3bt-2018, respectively supporting up to 51 W and up to 71.3 W delivered power, optionally by using all four pairs for power. [10] Each pair needs to handle a current of up to 600 mA (Type 3) or 960 mA (Type 4). [11] Additionally, support for 2.5GBASE-T, 5GBASE-T and 10GBASE-T is included. [12]
802.3 Ethernet packet and frame structure Layer Preamble Start frame delimiter (SFD) MAC destination MAC source 802.1Q tag (optional) Ethertype (Ethernet II) or length (IEEE 802.3)
On November 12, 2018, the IEEE P802.3cn Task Force started working to define PHY supporting 50-Gbit/s operation over at least 40 km of SMF. [ 8 ] The IEEE 802.3cd standard was approved on December 5, 2018.
EtherType is a two-octet field in an Ethernet frame.It is used to indicate which protocol is encapsulated in the payload of the frame and is used at the receiving end by the data link layer to determine how the payload is processed.