Chapter X: X: X.21 X-Y Recorder

X.21

A CCITT standard that governs the interface between data terminal equipment (DTE) and data communications equipment (DCE) for synchronous operation mode on public data networks.

X.25

A CCITT standard that governs the interface between data terminal equipment (DTE) and data communications equipment (DCE) for terminals that operate in the packet mode on public data networks.

X.400

An ISO standard for session layer. A CCITT standard for messaging and document distribution protocol. X.400 is also used to connect different e-mail systems.

x-axis

The horizontal axis on a coordinate plane.

XbarR chart

In statistical process control (SPC), a plot that shows the range of sample values as well as the arithmetical mean of the average for the sample of data.

XGA

Extended Graphics Adapter (Array). A video display technology that is faster than VGA and causes less eyestrain but works only on Micro Channel 386SX PCs or better. XGA resolution is 1024 x 768 pixels, and 256 colors are supported.

See also CGA, EGA, PGA, SVGA, VGA, and UXGA.

xerography

A dry copying process that involves the photoelectric discharge of an electrostatically charged plate. The copy is made by tumbling a resinous powder over the plate. The remaining electrostatic charge is discharged, and the resin is transferred to paper or to an offset printing master.

X-height

In the typographical composition of screen displays and printing, the height of lowercase letters, not including ascenders and descenders.

The Automation, Systems, and Instrumentation Dictionary, Fourth Edition

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