PHY

PHY

PHY (often pronEng|ˈfaɪ "fye") is a common abbreviation for the physical layer of the OSI model.

A PHY connects a link layer device (often called a MAC) to a physical medium such as an optical fibre or copper cable. A PHY typically includes a PCS (Physical Coding Sublayer) and a PMD (Physical Medium Dependent) layer. The PCS encodes and decodes the data that is transmitted and received. The purpose of the encoding is to make it easier for the receiver to recover the signal.

Example uses

* Ethernet: A PHY chip (called PHYceiver) is commonly found on Ethernet devices. Its purpose is digital access of the modulated link. Usually used together with an MII-chip or interfaced to a Microcontroller that takes care of the higher layer functions.
* USB: A PHY chip is integrated into most Universal Serial Bus (USB) controllers in hosts or embedded systems and provides the bridge between the digital and modulated parts of the interface.
* IrDA: The Infrared Data Associations IrDA specification includes an IrPHY specification for the physical layer of the data transport.
* S-ATA: Serial ATA controllers like the VIA6421 use a PHY.


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  • -phy — phy·ta; …   English syllables

  • phy — phy·tase; phy·tate; phy·tel·e·phas; Phy·tin; phy·tiv·o·rous; phy·to·bacteriology; phy·to·bezoar; phy·to·biology; phy·to·cecidium; phy·to·chlore; phy·to·ci·dal; phy·to·cide; phy·to·climatology; phy·to·coe·no·sis; phy·to·concretion;… …   English syllables

  • PHY — (аббревиатура от англ. Physical layer физический уровень)  интегральная схема, предназначенная для выполнения функций физического уровня сетевой модели OSI. Микросхемы PHY позволяют другим микросхемам канального уровня, называемыми MAC …   Википедия

  • phy|la — «FY luh», noun. 1. plural of phylum. 2. plural of phylon …   Useful english dictionary

  • phy|le — «FY lee», noun, plural lae« lee». 1. (in ancient Greece) a tribe or clan, based on supposed kinship. 2. (in Attica) a political, administrative and military subdivision, made chiefly on a geographical basis. ╂[< Greek ph tribe, clan, related… …   Useful english dictionary

  • phy|to|bi|ol|o|gy — «fy toh by OL uh jee», noun. the branch of biology which deals with plants …   Useful english dictionary

  • phy|to|so|ci|ol|o|gy — «FY toh SOH see OL uh jee, SOH shee », noun. the branch of plant ecology dealing with the interrelations among the plants of various areas …   Useful english dictionary

  • PHY — Ethernet PHY Chip PHY ist ein Begriff aus der Computer und Nachrichtentechnik, mit dem ein spezieller integrierter Schaltkreis oder eine funktionelle Gruppe eines Schaltkreises bezeichnet wird, die für die Kodierung und Dekodierung von Daten… …   Deutsch Wikipedia

  • PHY — En électronique et en technologie informatique, PHY est une abréviation couramment utilisée pour désigner la couche physique du modèle OSI (couche de plus bas niveau). Cette couche consiste en une cellule de conversion analogique numérique. En… …   Wikipédia en Français

  • phy|to|ge|og|ra|phy — «FY toh jee OG ruh fee», noun. the science that deals with the geographical distribution of plants: »What bearing had the phytogeography of the past on the evolution and dispersal of major groups like the flowering plants? (London Times) …   Useful english dictionary

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