Ethernet maps the two lowest layers of osi model ( seven - layer module ) : data link layer and physical layer and divides them to some function sublayers including pcs ( physical coding sublayer ) , pma ( physical medium attachment ) and pmd ( physical medium depend ) in physical layer . in these sublayers , logical link control ( llc ) is implemented through operation system , nic driver software and medium access control ( mac ) and the physical layer below it are implemented by the nic 以太網(wǎng)對應(yīng)了osi開放系統(tǒng)模型( 7層網(wǎng)絡(luò)模型)的最下兩層:數(shù)據(jù)鏈路層和物理層,并將其細(xì)分為一些功能子層,包括數(shù)據(jù)鏈路層的llc (邏輯鏈路控制)子層和mac (介質(zhì)訪問控制)子層,物理層的pcs (物理編碼子層) 、 pma (物理介質(zhì)附加子層)和pmd廈門大學(xué)碩士學(xué)位論文摘要(物理介質(zhì)相關(guān)于層) 。