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Definition of "Physical Layer" |
Layer 1 of the OSI architectural model which defines the size and shape of the connector, the gender, and pin assignments. The physical connections to the media and their characteristics, and their interface topology. Whether the transmission is by serial bits or multiple bits in parallel, and if any Handshaking between data bits or words is required. How communication between nodes is accomplished, either by full-duplex or half-duplex transmission and the raw signaling speed and clock rate. Including the definition of symbols with respect to signal characteristics (signal amplitude and pulse time), and electrical requirements including impedance, attenuation, acceptable noise and so on. / In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first layer. The implementation of this layer is often termed PHY. The physical layer consists of the basic networking hardware transmission technologies of a network. / An error-detection code by itself does not control errors, but it can be used to request repeated transmission of errored code words until they are received error-free. This technique is called ARQ. |
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