The Cable Center

This glossary of cable and telecommunications terms is intended to enhance your understanding of this dynamic industry. We are able to present this information with the generous help of CableLabs - consult their website for the most up-to-date information about cable technology.

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X.509 Certificate
A public key certificate specification developed as part of the ITU-T X.500 standards directory.

XAIT
Extended Application Information Table. Used for launching and managing the lifecycle of unbound applications.

xDSL
The general term applied to a whole family of high-speed digital data products. The letters DSL stand for Digital Subscriber Line. The x is a place keeper for the term describing the type of DSL connection: A for Asymmetric, H for High Speed, I for ISDN, S for Symmetric. These new technologies, ADSL, HDSL, IDSL, and SDSL are expected to be the next-generation high-speed data products that will someday replace existing technologies like ISDN and Fractional T-1 lines.

Xlet
Xlet is the interface used for execution engine application lifecycle control.