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PHY is an abbreviation for the physical layer of the OSI model and refers to the circuitry required to implement physical layer functions. A PHY connects a link layer device (often called MAC as an abbreviation for media access control) to a physical medium such as an optical fiber or copper cable.
Definition of PHYLOGENY. 1. : the evolutionary history of a kind of organism. 2. : the evolution of a genetically related group of organisms as distinguished from the development of the individual organism.