说明：  IEEE 802.3 2012 标准,以太局域网络操作 1 Mb / s到100 Gb / s的采用通用的媒体访问控制（MAC）规范和管理信息库（MIB）。带有冲突检测（CSMA / CD）的载波侦听多路访问 MAC协议指定共享介质（半双工）的操作，以及全双工操作。速度具体媒体独立接口（MIIS）允许使用选定的物理层设备（PHY）工作在同轴电缆，双绞线或光纤电缆。系统注意事项多段共享接入网络描述使用被定义为中继器运行速度高达1000 Mb / s的。支持局域网（LAN）运行在所有速度。其他特定功能包括对接入网络的各种PHY类型，物理层适于城域网的应用，并在所选择的提供功率的双绞线PHY类型
(IEEE 802.3 2012 standard,Ethernet local area network operation is specified for selected speeds of operation from 1 Mb/s to 100 Gb/s using a common media access control (MAC) specification and management information base (MIB). The Carrier Sense Multiple Access with Collision Detection (CSMA/CD) MAC protocol specifies shared medium (half duplex) operation, as well as full duplex operation. Speed specific Media Independent Interfaces (MIIs) allow use of selected Physical Layer devices (PHY) for operation over coaxial, twisted-pair or fiber optic cables. System considerations for multisegment shared access networks describe the use of Repeaters that are defined for operational speeds up to 1000 Mb/s. Local Area Network (LAN) operation is supported at all speeds. Other specified capabilities include various PHY types for access networks, PHYs suitable for metropolitan area network applications, and the provision of power over selected twisted-pair PHY types)