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  • X Series Recommendations drawn up 51 by the ITU-TS to establish interfaces for Terminal Equipment (DTE) and Data Circuit Terminating Equipment (DCE) and public data networks (PDN). The series includes:
  • X.1 International user classes of service.
  • X.2 International data transmission services and optional facilities.
  • X.3 Packet Assembly/Disassembly (pad).
  • X.4 International Alphabet No.5 for character oriented data.
  • X.20 Asynchronous communications interface definitions for use over the PSTN.
  • X.20 bis V-series compatible modem, asynchronous communications interface definitions for use over the PSTN.
  • X.21 Synchronous communications interface definitions for use over the PSTN.

  • X.21 bis V-series compatible modem, synchronous communications interface definitions for use over the PSTN.
  • X.25 Interface between DTE and DCE for terminals using packets over public data networks.
  • X.28 DTE/DCE interface for asynchronous DTE accessing a pad.
  • X.29 Definition of handshake protocol for use between pads and between the pad and DTE.
  • X.30 Support of X.20 bis, X.21 and X.21 bis DTEs by ISDN.
  • X.31 Support of packet mode DTEs by ISDN.
  • X.32 Interface between DTE and DCE for terminals operating in packet mode accessing public data networks via PSTN, ISDN or circuit switched PDN.
  • X.50 Fundamental parameters of multiplexing scheme for the international interface between synchronous data networks.
  • X.50bis Fundamental parameters of 48Kbit/s transmission for the international interface between synchronous data networks.
  • X.51 Fundamental parameters of multiplexing scheme for the international interface between synchronous data networks using 10-bit envelope structure.
  • X.51bis Fundamental parameters of a 481Kbit/s transmission scheme for the international interface between synchronous data networks using a 10-bit envelope structure.
  • X.58 Fundamental parameters of multiplexing scheme for the international interface between synchronous data networks using a 10-bit envelope structure.

  • X.60 Common channel signaling for circuit switched data applications.
  • X.61 Signaling system no.7 - data user part.
  • X.70 Terminal and transit control signaling for asynchronous services on international circuits between anisochronous data networks.
  • X.71 Decentralized terminal and transit control signaling on international circuits between synchronous data networks.
  • X.75 Packet switched signaling between public networks providing data transmission services.
  • X.80 Interworking of inter-exchange signals for circuit switched data services.
  • X.92 Hypothetical reference connections for synchronous PDNs.
  • X.96 Call progress signals in PDNs.
  • X.110 international routing principles and routing plan for PDNs.
  • X.121 International numbering plan for PDNs.
  • X.130 Call set-up and clear-down times for international connection to synchronous PDNs.
  • X.132 Grade of service over international connections to PDNs.
  • X.400 A message handling system standard that permits the electronic exchange of text as well as other electronic data like graphics and fax. The X.400 standard is an overview which is broken down under these numbers:

  • X.402 Overall Architecture.
  • X.403 Conformance Testing.
  • X.407 Abstract service definition conventions.
  • X.408 Encoded information type conversion rules.
  • X.411 Message transfer system.
  • X.413 Message store.
  • X.419 Protocol specifications.
  • X.420 Interpersonal messaging system.
  • X.500 A directory standard that lets applications like e-mail access information which can either be central or distributed. The benefit of a directory is the ability to minimize the impact on the user of changes to a network. The standard is broken down under subsequent numbers:
  • X.501 Models.
  • X.509 Authentication framework.
  • X.511 Abstract service definition.
  • X.518 Procedures for distributed operation.
  • X.519 Protocol specifications.

  • X.520 Selected attribute types.
  • X.521Selected object types.
  • Xapia (X.400 Application Programming Interface Association) Body standardizing the interface to X.400 e-mail services. Other APIS, like VIM and MAPI, are likely to comply with Xapia when it is finalized.
  • X/Open A body comprising of computer vendors, responsible for researching, defining and publicizing open systems.
  • X.Windows A networked GU I based on a client/server architecture, it displays information from multiple networked hosts on a single workstation. Available on PCs as X.terminal emulation and emulation on LAN servers.



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