10 Gigabit Ethernet - Computer Definition
Standardized by the IEEE as 802.3ae, 10GbE uses the same frame format and medium access control (MAC) layer as predecessor Ethernets. 10GbE runs only in full-duplex (FDX) mode, which makes collision control unnecessary.The primary line coding technique used in both 10GbE and GbE is 8B/10B, which carries a 25 percent overhead penalty, thereby forcing the system to run at a signaling rate of 125 Gbps. Some 10GbE systems use the more recently developed 64B/66B line coding, which is similar but much more efficient.Although the signaling rates discourage the use of copper transmission media, 802.3ae currently specifies 10GBase-T for short distances using Cat 6 and Cat 7 twisted pair. Fiber optic systems are preferable, however, and 802.3ae specifies a number of options, including 10GBase-SR, SW; 10GBase-LR, LW; 10GBase-ER, EW; and 10GBase-LX4. 10GbE has application in the backbones of very bandwidth intensive local area networks (LANs) and metropolitan area networks (MANs). See also 10GBase-CX4; 10GBase-SR, SW; 10GBase-LR, LW; 10GBase-ER, EW; 10GBase-LX4; 64B/66B; 802.3ae; 8B/10B; Cat 6; Cat 7; IEEE; LAN, line coding; MAC; MAN; overhead; and signaling rate.
StandardFiber TypeCore DiameterWavelengthDistance (Maximum) 10GBase-SR, SW MMF 62.5
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An Ethernet standard that transmits at 10 Gbps. Introduced in 2002 and abbreviated "10 GbE," "10GE" or "10G Ethernet," it extended the familiar and ubiquitous Ethernet used in local area networks (LANs) to high-speed storage networks (SANs) as well as backbones in large enterprise networks and wide area and metropolitan area networks. See LAN, SAN, WAN and MAN. Full Duplex and No Collisions 10G Ethernet works only in full-duplex mode and does not support CSMA/CD, the common Ethernet collision method used to gain access to the physical medium. A "WAN interface sublayer" (WIS) makes 10G Ethernet compatible with the SONET transport at 10 Gbps (OC-192). See SONET. Fiber or Copper The 10GBASE-LX4 version (see below) carries four wavelengths of light on one pair of fibers. In 2004, 10G Ethernet over copper wire was introduced. Using four twinaxial cables, the copper version was designed for short distances between switches and storage devices in the datacenter. See Ethernet and FCoE. 10G ETHERNET OVER FIBER (802.3ae) Fiber (F) Fiber Max Version SONET (S) Type Distance 10GBASE-SR F MMF/850 nm 65 m 10GBASE-LRM F MMF/1310 nm 220 m 10GBASE-LRM F MMF/850 nm 260 m 10GBASE-LX4 F MMF/1310 nm 300 m 10GBASE-LR F SMF/1310 nm 10 km 10GBASE-ER F SMF/1550 nm 40 km 10GBASE-ZR** F SMF/1550 nm 80 km 10GBASE-LX4 F SMF/1310 nm 10 km 10GBASE-SW S MMF/850 nm 65 m 10GBASE-LW S SMF/1310 nm 10 km 10GBASE-EW S SMF/1550 nm 40 km MMF = multimode fiber SMF = singlemode fiber ZR** = non standard 10G ETHERNET OVER COPPER (802.3ak) FOR DATACENTER USE Version Cable Max. Distance 10GBASE-CX4 Twinax 15 m
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