Glossary Terms and Definitions Beginning with the Letter X

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XAUI Innovation of the 10 Gigabit Ethernet Task Force. XAUI (pronounced "Zowie") is a ten Gigabit/second interface. The "AUI" portion is borrowed from the Ethernet Attachment Unit Interface. The "X" represents the Roman numeral for ten and implies ten gigabits per second. The XAUI is designed as an interface extender, and the interface which it extends is the XGMII, the ten Gigabit Media Independent Interface.
XCO Crystal clock oscillator (XCO): An oscillator that relies on a crystal for its frequency reference. A piezoelectric crystal oscillates at a very stable frequency.
xfmr See Transformer
xmitter See Transmitter