| 单词 | Gigabit Ethernet (GbE, GigE, and GigEnet) |
| 释义 | Gigabit Ethernet (GbE, GigE, and GigEnet) Standardized by the IEEE (1998) as IEEE 802.3z, GigE is a backbone Ethernet solution that operates at 1 Gbps and is fully compatible with 10/100-Mbps Ethernet. GigE is available in both shared bus and switched versions, both of which support multiple ports that can run at 1 Gbps in full-duplex (FDX). Specifications include shared bus hubs, matrix switches, and transmission media. A GigE shared bus solution is a high-speed hub that uses CSMA/CD for medium access control (MAC) and can run at a speed of several Gbps. Switched GigE buffers incoming Ethernet frames, passing them to the output port when the shared bus becomes available. More substantial switched GigE products offer nonblocking matrix switching.Transmission media specifications include twisted pair (1000Base-T) and fiber optics (1000Base-LX and 1000Base-SX), and employs the same 8B/10B line coding technique used in ESCON and Fibre Channel. Although GigE is much like the predecessor 10/100-Mbps Ethernet versions, differences include frame size. As the clock speed of GbE is one or two orders of magnitude greater, issues of roundtrip propagation delay affect error detection. To avoid potentially disastrous collision rates, the minimum frame size is increased from 64 octets to 512 octets, which generally is equivalent in duration to transmitting a 64-byte frame at 100 Mbps.The larger minimum frame size provides the same time for the transmitting device to receive and interpret a collision notification.Although nonstandard, some manufacturers have increased the maximum frame size from 1,518 bytes to a jumbo frame size of 9,000 bytes, which improves throughput as there are fewer frame headers to be analyzed and fewer inter-frame intervals. GigE is found not only in local area network (LAN) backbones, but also is used by service providers in metropolitan area networks (MANs). See also 1000Base-LX, 1000Base-SX, 1000Base-T, 8B/10B, backbone, CSMA/CD, ESCON, Ethernet, FDX, Fibre Channel, LAN, LAN switch, MAC, and MAN. |
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