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

It enables low cost and V1.1 and V2.0. 802.3ab specified that copper gigabit Ethernet requires autonegotiation, if you can disable auto-negotiation and "force" gigabit connection in the settings, it most probably means that your hardware still uses the older, no-so-compatible According to IEEE Interpretation: Although operating speed is allowed to be manually selected by disabling Auto-Negotiation in Control Register 0, selecting 1000BASE-T mode of operation still requires that Auto-Negotiation be used. 802.3z is commonly referred to as 1000BASE-X, where -X refers to either -CX, -SX, -LX, or (non-standard) -ZX. 100Base-TX: requires cat 5 or better. Standards, IEEE 802.3 10Base-T Ethernet IEEE 802.3u 100Base-TX Fast Ethernet IEEE 802.3ab 1000Base-T Gigabit Ethernet ANSI/IEEE Std 802.3 Nway Auto-Negotiation IEEE 802.3x flow control. 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). The docs below IEEE 802.3u standard clause 28 (for Fast Ethernet) IEEE standard 802.3z Standard clause 37 (for Gigabit Ethernet)". The Gigabit Ethernet standard is described in the IEEE 802.3z standard, which was defined in 1998. "The IEEE 802.3 standard default is to run with autonegotiation enabled. IEEE 802.3, 802.3u and 802.3ab (10BASE-T, 100BASE-TX, and 1000BASE-T) compatible. The 5 ports Gigabit Ethernet Switch is a high performance Smart Gigabit switch that provides an ideal solution for workgroup or department Gigabit applications. Has evolved into the most widely implemented. Gigabit ethernet doesn't even officially support anything but autonegotiation. It implements 10/ 100/1000Mbps Ethernet LAN function based on IEEE802.3, IEEE802.3u, IEEE802.3ab standards or HomePNA standard. The IEEE 802.3z defines the Gigabit Ethernet over fiber and cable, which has a physical media standard 1000Base-X (1000BaseSX - short wave covers up to 500m, and 1000BaseLX - long wave covers up to 5km). Full Duplex mode can double bandwidth to 200 Mbps. The AX88178 USB to 10/100/1000 Gigabit Ethernet/HomePNA/HomePlug controller is a high performance and highly integrated ASIC with embedded 40KB SRAM for packet buffering. The 802.3ab document specifically describes the 1000BASE-T standard, which was done in 1999.