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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.
For other uses, see Cacophony (disambiguation) and Euphony (disambiguation). Phonaesthetics (from the Greek: ÏÏÎ½Î® phÅnÄ, voice-sound; and Î±á¼°ÏÎ¸Î·ÏÎ¹ÎºÎ® aisthÄtikÄ, aesthetics) is the study of the inherent pleasantness (euphony) or unpleasantness (cacophony) of the sound of certain words, phrases, and sentences. The closely related but different concept of phonaesthesia should be distinguished from this meaning.