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Reference.org
Physical coding sublayer
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<p>The physical coding sublayer (PCS) is a networking protocol sublayer in the <a href="/facts/Fast_Ethernet/YM5HjX0C">Fast Ethernet</a>, <a href="/facts/Gigabit_Ethernet/1ItIoV2w">Gigabit Ethernet</a>, and <a href="/facts/10_Gigabit_Ethernet/FvxUohpf">10 Gigabit Ethernet</a> standards. It resides at the top of the <a href="/facts/Physical_layer/WuATCrVw">physical layer</a> (PHY), and provides an interface between the physical medium attachment (PMA) sublayer and the <a href="/facts/Media-independent_interface/CKB7edH3">media-independent interface</a> (MII). It is responsible for data encoding and decoding, <a href="/facts/Scrambler/7w50xTmw">scrambling and descrambling</a>, alignment marker insertion and removal, block and symbol redistribution, and lane block synchronization and deskew. </p>