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Home > Resources > Telephony and IT terms

Telephony and IT terms

There are 1522 entries in this glossary.
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TermDefinition
X.28

DTE/DCE interface for a start/stop mode DTE accessing the packet assembly/disassembly facility (PAD) on a public data network situated in the same country.

X.29

Procedures for exchange of control information and user data between a packet mode DTE, and a packet assembly/disassembly (PAD) facility.

X.3

Packet assembly/disassembly facility (PAD) in public data networks.

X.30

Rate adaption to low speed synchronous and asynchronous used by ISDN.

X.31

Support Packet Mode Terminal Equipment by an ISDN.

X.32

Interface between DTE and data circuit terminating equipment for terminals operating in the packet switching mode and accessing a packet switch public data network through the PSTN.

X.400

Networks message handling systems Series.

X.500

A Directory Services standard that permits applications such as email to access a standard directory to enable global access to users.

X.500 is the series of computer networking standards covering electronic directory services and was developed by ITU-T, formerly known as CCITT, and first approved in 1988.

xDSL

A generic term for the family of technologies designed to bring advanced digital services to the home using the standard copper access cable.

Typically, the download speed of consumer DSL services ranges from 256kbit/s to 24,000kbit/s, depending on DSL technology, line conditions and service level implemented.

Typically, upload speed is lower than download speed for ADSL and equal to download speed for SDSL.

see ADSL, HDSL, DSL Lite & VDSL.

Xerox

Xerox Corporation.

Am major manufacturer of color and black-and-white printers, multifunction systems, photo copiers, digital production printing presses and supplies.

XGA

see Extended Graphics Array.

XGA+

see Extended Graphics Array.

Y2K

see Year 2000.

Yahoo

A popular Internet search engine.

Year 2000

The term used to describe the roll-over from 1999 to 2000 (midnight, 31.12.1999).

The concern was whether computers would be able to continue working due to embedded date problems.

Yellow Book

The set of telecommunications Recommendations issued by the ITU-T in 1980.

It was referred to as the yellow book because it had yellow covers.

Superceded by the Red Book and the Blue Book in 1988.

Z39.50

Z39.50 is a protocol mainly used in library environments, being incorporated into integrated computer library systems.

The protocol began its life in the 1970s, with the last version being released in 2003.

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