physical layer - definizione. Che cos'è physical layer
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Cosa (chi) è physical layer - definizione

THE LOWEST-LEVEL ELECTRONIC OR OPTICAL TRANSMISSION FUNCTIONS OF A NETWORK
Physical signaling sublayer; OSI layer 1; PHY; PHYceiver; Physical protocol layer; Layer 1; Physical link; Physical channel; Physical Layer; Physical-layer; OSI Layer 1; Ethernet PHY; PHY chip; Layer-1; PHY (chip); High PHY; Low PHY
  • Texas Instruments DP83825 - 3mm x 3mm 3.3V PHY chip
  • RTL8201 Ethernet PHY chip
  • Micrel]] KS8721CL - 3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver

physical layer         
<networking> Layer one, the lowest layer in the OSI seven layer model. The physical layer encompasses details such as electrical and mechanical connections to the network, transmission of binary data as changing voltage levels on wires or similar concepts on other connectors, and {data rates}. The physical layer is used by the data link layer. Example physical layer protocols are CSMA/CD, token ring and bus. (2004-06-29)
Physical layer         
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. This layer may be implemented by a PHY chip.
layer 1         

Wikipedia

Physical layer

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. The shapes and properties of the electrical connectors, the frequencies to broadcast on, the line code to use and similar low-level parameters, are specified by the physical layer.

At the electrical layer, the physical layer is commonly implemented by dedicated PHY chip or, in electronic design automation (EDA), by a design block. In mobile computing, the MIPI Alliance *-PHY family of interconnect protocols are widely used.

Historically, the OSI model is closely associated with internetworking, such as the Internet protocol suite and Ethernet, which were developed in the same era, along similar lines, though with somewhat different abstractions. Beyond internetworking, the OSI abstraction can be brought to bear on all forms of device interconnection in data communications and computational electronics.

Esempi dal corpus di testo per physical layer
1. "To come up with a mix of the two approaches for that physical layer would not be practical." The two sides could use one camp‘s disc structure and the other‘s software, generating royalties for both.