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An instantiation of 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. A PHY device typically includes a Physical Coding Sublayer (PCS) and a Physical Medium Dependent (PMD) 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.
- Wireless LAN or Wi-Fi: The PHY portion consists of the RF, mixed-signal and analog portions, that are often called transceivers, and the digital baseband portion that use digital signal processor (DSP) and communication algorithm processing, including channel codes. It is common that these PHY portions are integrated with the media access control (MAC) layer in System-on-a-chip (SOC) implementations. Other similar wireless applications are 3G/4G/LTE, WiMAX, UWB, etc.
- Ethernet: A PHY chip (PHYceiver) is commonly found on Ethernet devices. Its purpose is to provide analog signal physical access to the link. It is usually used in conjunction with a Media Independent Interface (MII) chip or interfaced to a microcontroller that takes care of the higher layer functions.
- Universal Serial Bus (USB): A PHY chip is integrated into most 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.
- Serial ATA (SATA): Serial ATA controllers like the VIA Technologies VT6421 use a PHY.
- SDRAM chip interfaces
- Flash memory chip interfaces
Ethernet physical transceiver
An Ethernet physical transceiver is often referred to as a physical layer transmitter and/or receiver, a physical layer transceiver, a PHY transceiver, a PHYceiver, or simply a PHY. The term PHYceiver is often shown as being TM (Trade Marked) but is not currently registered with TESS United States Patent and Trademark Office. PHYceiver is used in marketing data sheets and frequently referenced in Patents. It is a component that operates at the physical layer of the OSI network model. The transceiver implements the Ethernet physical layer portion of the 1000BASE-T, 100BASE-TX, and 10BASE-T standards.
An Ethernet PHYceiver is a chip that implements the hardware send and receive function of Ethernet frames; it interfaces to the line modulation at one end and binary packet signaling at the other. Functions like MAC addressing are implemented by the Media Access Control function. Wake-on-LAN and Boot ROM functionality is implemented in the network interface card (NIC), which may have PHY, MAC and other functionality integrated into one chip or as separate chips.