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In IEEE 802 LAN/MAN standards, the medium access control (MAC), also called media access control, is the layer that controls the hardware responsible for interaction with the wired (electrical or optical) or wireless transmission medium. The MAC sublayer and the logical link control (LLC) sublayer together make up the data link layer.
Industrial Ethernet (IE) is the use of Ethernet in an industrial environment with protocols that provide determinism and real-time control. [1] Protocols for industrial Ethernet include EtherCAT , EtherNet/IP , PROFINET , POWERLINK , SERCOS III , CC-Link IE , and Modbus TCP .
In 2003, Apple was the first to introduce commercial products with the new connector, including a new model of the Power Mac G4 and a 17" PowerBook G4. The full IEEE 1394b specification supports data rates up to 3200 Mbit/s (i.e., 400 MB/s) over beta-mode or optical connections up to 100 metres (330 ft) in length.
Thus any MAC may be used with any PHY, independent of the network signal transmission medium. The MII can be used to connect a MAC to an external PHY using a pluggable connector, or directly to a PHY chip on the same PCB. On older PCs the CNR connector Type B carried MII signals.
The physical-layer specifications of the Ethernet family of computer network standards are published by the Institute of Electrical and Electronics Engineers (IEEE), which defines the electrical or optical properties and the transfer speed of the physical connection between a device and the network or between network devices.
Key management and the establishment of secure associations is outside the scope of 802.1AE, but is specified by 802.1X-2010.. The 802.1AE standard specifies the implementation of a MAC Security Entities (SecY) that can be thought of as part of the stations attached to the same LAN, providing secure MAC service to the client.
Autonegotiation is the procedure by which two connected devices choose common transmission parameters, e.g. speed and duplex mode. Autonegotiation was initially an optional feature, first introduced with 100BASE-TX (1995 IEEE 802.3u Fast Ethernet standard), and is backward compatible with 10BASE-T.
MAC-48 was used to address hardware interfaces within existing 802-based networking applications; EUI-48 is now used for 802-based networking and is also used to identify other devices and software, for example Bluetooth. [3] [4] The IEEE now considers MAC-48 to be an obsolete term. [5] EUI-48 is now used in all cases. In addition, the EUI-64 ...