"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

X-by-Wire Bus A term used to describe an automotive or vehicle Bus. Normally an X-by-Wire interface is a serial bus.

XAUI Ten Attachment Unit Interface

XGMII 10 Gigabit Media Independent Interface. Uses SSTL_2 interface levels. XGMII provides an optional interconnection between the Media Access Control (MAC) sublayer and the Physical layer (PHY) of 10 Gigabit Ethernet.

XSBI 10-Gb Sixteen Bit Interface.

XOFF An abbreviation for the ASCII transmissioncontrol character meaning “Transmitter off.” (188)

XON An abbreviation for the ASCII transmissioncontrol character meaning “Transmitter on.”(188).

X. -SERIES. Sets of data telecommunications protocols and interfaces defined by CCITT Recommendations.