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