Business telecommunications and IT systems

The X series Recommendations from the ITU-T regarding dedicated data communications networks.

Designed to replace earlier V.24 and V.25 interface recommendations, it covers the connection of terminals to modems.

A general purpose interface between DTE and data circuit terminating equipment for synchronous operation on public data networks, using, for example, Kilostream.

General purpose interface between DTE and DCE with synchronous data.

Electrically V.28 presented on a 25 way D-Type connector (DB-25).

i)  Interface between DTE and data circuit terminating equipment for terminals operating in the packet switching mode on public data networks.

ii) In Frame Relay terms, an OSI Layer 3 PSDN packet switched connection oriented buffered network protocol with sequencing, extensive error checking and recovery that allows virtual circuits to be established over a physical link.

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.

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

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

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

Support Packet Mode Terminal Equipment by an ISDN.

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.

Networks message handling systems Series.

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.

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 Corporation.

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

see Extended Graphics Array.

see Extended Graphics Array.