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IEEE Std 802.3ab (GigaBit Ethernet 1000BaseT)
Publisher: Institute of Electrical & Electronics Enginee

The Working Group 802.2 have developed standards for Logical Link Control (LLC); while the IEEE 802.3 Ethernet Working Group have specified the physical layer (Layer 1) and MAC portion of the data link layer (Layer 2). The docs below IEEE 802.3u standard clause 28 (for Fast Ethernet) IEEE standard 802.3z Standard clause 37 (for Gigabit Ethernet)". My understanding is the IEEE 802.3ab standard (1000BASE-T aka Gigabit Ethernet) was originally developed for use with Cat 5 cabling. Technology improvements, and better interoperation of autonegotiation make it the preferred mode of operation, and is required on new technologies such as 1000BASE-T (802.3ab). Gigabit ethernet doesn't even officially support anything but autonegotiation. Leveraging these two technologies means that the standard can take advantage of the existing high-speed physical interface technology of FibreChannel while maintaining the IEEE 802.3 Ethernet frame format, backward compatibility for .. 1000base-T is the copper based version of the gigabit Ethernet standard defined by 802.3ab which, since it is over 6 months old, is available free of charge from the enlightened IEEE. The LLC sublayer is the cable length is 100 meters. IEEE 802.3 Ethernet Working IEEE 802.2 standards is the IEEE 802 standard defining Logical Link Control (LLC). 1000BASE-T) – specified in 802.3z and 802.3ab. The IEEE 802.3ab committee is examining Gigabit Ethernet transmission over UTP Category 5 cable (1000BaseT). "The IEEE 802.3 standard default is to run with autonegotiation enabled.