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In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer: the layer most closely associated with the physical connection between devices. The physical layer provides an electrical, mechanical, and procedural interface to the transmission medium.
This layer is the protocol layer that transfers data between nodes on a network segment across the physical layer. [2] The data link layer provides the functional and procedural means to transfer data between network entities and may also provide the means to detect and possibly correct errors that can occur in the physical layer. The data link ...
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.
The Ethernet PMD sublayer is part of the Ethernet physical layer (PHY). The hierarchy is as follows: Data link layer (Layer 2) Logical link control (LLC) sublayer; Medium access control (MAC) sublayer Reconciliation sublayer (RS) – This sublayer processes PHY local/remote fault messages and handles DDR conversion; PHY layer (Layer 1)
The link layer corresponds to the OSI data link layer and may include similar functions as the physical layer, as well as some protocols of the OSI's network layer. These comparisons are based on the original seven-layer protocol model as defined in ISO 7498, rather than refinements in the internal organization of the network layer.
Physical Layer Convergence Protocol is the physical layer protocol of several data transmission networks. It is used in the 802.11 standard. References
The Stig is a character from the British motoring television show Top Gear.Created by former Top Gear presenter Jeremy Clarkson and producer Andy Wilman, the character is a play on the anonymity of racing drivers' full-face helmets, with the running joke that nobody knows who or what is inside the Stig's racing suit.
The Big One is a phrase describing any crash usually involving eleven or more cars in NASCAR, ARCA, and IndyCar racing. It is most commonly used at Daytona International Speedway and Talladega Superspeedway, although occasionally seen at other tracks as well, such as Dover Motor Speedway and Watkins Glen International.