Editing XAUI (section)

{{Short description|10 Gigabit Attachment Unit Interface}}

'''10 Gigabit Attachment Unit Interface''' ('''XAUI''' {{IPAc-en|ˈ|z|aʊ|i}} {{respell|ZOW|ee}}) is a standard for extending the [[XGMII]] (10 Gigabit Media Independent Interface) between the [[Medium access control|MAC]] and [[PHY]] layer of [[10 Gigabit Ethernet]] (10GbE) defined in Clause 47 of the [[IEEE 802.3]] standard. The name is a concatenation of the [[Roman numeral]] X, meaning ten, and the initials of "[[Attachment Unit Interface]]".

The purpose of the XGMII Extender, which is composed of an XGXS (XGMII Extender Sublayer) at the MAC end, an XGXS at the PHY end and a XAUI between them, is to extend the operational distance of the XGMII and to reduce the number of interface signals. Applications include extending the physical separation possible between MAC and PHY components in a 10 Gigabit Ethernet system distributed across a circuit board.