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The letter used by the ITU to categorize standards relating to data communications over digital circuits; the number following the letter identifies a particular standard. Some of the more important standards in the X-series are listed.X3 PAD control;X25 data signaling between the equipment associated with the PTT and the user;X28 communication between a PAD and an ASCII device;X29 communication between two PADs;X75 communication between networks using X25;X121 standards for addressing in an X25 network;X400 message handling services: all standards in the range X400 to X499 relate to various aspects of message handling;X500 directory services: all standards in the range X500 to X599 relate to various aspects of directory services.

X3 PAD control;

X25 data signaling between the equipment associated with the PTT and the user;

X28 communication between a PAD and an ASCII device;

X29 communication between two PADs;

X75 communication between networks using X25;

X121 standards for addressing in an X25 network;

X400 message handling services: all standards in the range X400 to X499 relate to various aspects of message handling;

X500 directory services: all standards in the range X500 to X599 relate to various aspects of directory services.

Subjects: Computing.


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