physical layer; PHY
Technical term in computer networking; the lowest layer of the OSI model, responsible for transmission of raw bits over a physical medium.
The physical layer defines the electrical specifications of cables and wireless signals.
There are various speed standards for the Ethernet physical layer.
physical medium dependent (PMD)
Compound of 物理 (ぶつり, 'physics') and 層 (そう, 'layer'), a direct translation of the English term 'physical layer'.