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. [T1.646-1995]

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… (Read More →)

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.

Synonym altazimuth mount.

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… (Read More →)

A protocol for network interworking which supports communication between adjacent networks and communication thru transit networks.

Any type of DSL Technology (x=type)

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).

10-Gigabit-capable Symmetric Passive Optical Network

Extensible Hypertext Markup Language

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.

Abbreviation for crystal oscillator.

An abbreviation for the ASCII transmission-control character meaning "Transmitter off. "

An abbreviation for the ASCII transmission-control character meaning "Transmitter on. "

Extensible Stylesheet

Abbreviation for crosstalk.