Telecom Dictionary - Definitions of terms
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X
X-bits: Unassigned overhead bits. Transmitters should code these bits as zeros while receivers are required to be capable of ignoring the value contained in these bits.
X-dimension of recorded spot - In facsimile systems, the effective recorded spot dimension measured in the direction of the recorded line. Note 1: By "effective recorded spot dimension" is meant the largest center-to-center spacing between recorded spots, which gives minimum peak-to-peak variation of density of the recorded line. Note 2: "X-dimension of recorded spot" implies that the facsimile equipment response to a constant density in the object (original) is a succession of discrete recorded spots.
X-dimension of scanning spot - In facsimile systems, the distance between the centers of adjacent scanning spots measured in the direction of the scanning line on the object. Note: The numerical value of the X-dimension of scanning spot depends upon the type of system.
Xerographic recording - Recording enabled by the scanning action of an optical beam on a photoconducting surface on which an electrostatically charged latent image is developed with a resinous powder (toner).
XML- Abbreviation for eXtensible Markup Language. A trimmed specification or version of the Standard Generalized Markup Language (SGML) that allows Web developers to create customized tags for additional functionality.
XO- Abbreviation for crystal oscillator.
XOFF - An abbreviation for the ASCII transmission-control character meaning "Transmitter off."
XON - An abbreviation for the ASCII transmission-control character meaning "Transmitter on."
X.-series Recommendations - Sets of data telecommunications protocols and interfaces defined by CCITT (now, ITU-T) Recommendations. Note: Some of the more common X.-series Recommendations are:
- X.25: A Recommendation for public packet switched communications between a network user and the network itself.
- X.75: A Recommendation for public packet switched communications between network hubs.
- X.400: An addressing scheme for use with e-mail.
- X.500: An addressing scheme for directory services.
XT- Abbreviation for crosstalk.
X-Y Mount - Synonym altazimuth mount.
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