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Introduction

This page contains a large number of resource links that points to tutorials, RFCs, papers, lecture notes of various university courses about "X.25". In addition to lecture notes we also listed some online free books which can be downloaded.

RFC

• Cisco Systems X.25 over TCP (XOT) - RFC 1613.
  
  It is sometimes desirable to transport X.25 over IP internets. The X.25 Packet Level requires a reliable link level below it and normally uses LAPB. This memo documents a method of sending X.25 packets over IP internets by encapsulating the X.25 Packet Level in TCP packets. click here
• SNMP MIB extension for Multiprotocol Interconnect over X.25 - RFC 1461.
  
  This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in TCP/IP-based internets. In particular, it defines objects for managing Multiprotocol Interconnect (including IP) traffic carried over X.25. click here
• PPP in X.25 - RFC 1598.
  
  The Point-to-Point Protocol (PPP) [1] provides a standard method for transporting multi-protocol datagrams over point-to-point links. This document describes the use of X.25 for framing PPP encapsulated packets. click here
• SNMP MIB Extension for the X.25 Packet Layer - RFC 1382.
  
  This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in TCP/IP-based internets. In particular, it defines objects for managing the Packet Layer of X.25. click here
• Critique of X.25 - RFC 874.
  
  The widely touted network interface protocol, "X.25", and its attendant conceptual framework, the International Standards Organization's Reference Model for Open System Interconnection (ISORM), are analyzed and found wanting. The paper is a companion piece to M82-48, and M82-51. click here
• SNMP MIB Extension for X.25 LAPB - RFC 1381.
  
  This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in TCP/IP-based internets. In particular, it defines objects for managing the Link Layer of X.25, LAPB. click here
• SMTP on X.25 - RFC 1090.
  
  This memo proposes a standard for SMTP on the virtual circuit facility provided by the X.25 standard of the CCITT. click here
• ISO-TP0 bridge between TCP and X.25 - RFC 1086.
  
  This memo proposes a standard for the Internet community. Hosts on the Internet that choose to implement ISO TP0 transport connectivity between TCP and X.25 based hosts are expected to experiment with this proposal. click here
• Multiprotocol Interconnect on X.25 and ISDN in the Packet Mode - RFC 1356.
  
  This document specifies the encapsulation of IP and other network layer protocols over X.25 networks, in accordance and alignment with ISO/IEC and CCITT standards. click here

Tutorials

• X.25 Protocol Stack - Protocols.com.
  
  Protocols.com offers a comprehensive listing of data communications protocols, their functions in respect to the OSI model, the structure of the protocol and various errors and parameters. Here you will find indepth details of X.25 protocol stack how they designed. click here
• X.25 Protocol - RAD Communications.
  
  This tutorial was built as a final project for the course "Protocols and Computer Networks" at Tel Aviv University. This project provides an overview of the X.25 protocol, including its three identified levels of architecture. click here
• X.25 Overview - Cisco.
  
  This overview provides the history and development of the X.25 protocol, describes the basic functions and components of X.25, as well as the frame formats of X.25. click here
• X.25 Packet Layer Protocol (PLP) Overview - Techfest.com.
  
  This document discusses the X.25 PLP is an implementation of the NETWORK layer, Layer 3, of the OSI architecture. As such, X.25 PLP is primarily concerned with network routing functions pertaining to end-user entities of public and private PACKET networks. click here
• X.25 Technical Guides - Devrytcom.com.
  
  A good resource center related to X.25 which contains detailed guides on topics like Packet Switching Fundamentals,X.25 Networks,X.25 multiplexer (Dataplexer) configuration guide , X.25 switch (Xplexer) configuration guide,X.25 Network Addressing, and Interpreting X.25 transmission statistics . click here
• X.25 and Netcom-II Guides - Netcom II On-line Manuals for UnixWare.
  
  This guide describes how to administer Netcom II, a comprehensive hardware/software package used to provide X.25 protocol services to a PC. Netcom II is designed to connect to packet-switched data networks. It can operate as either a DCE (i.e. network switch) or DTE (i.e. customer-provided equipment), allowing direct connection to another computer without an intervening network. The Programmer's Guide describes the interfaces available to application developers who wish to access and control the WAN lines from a C language program. Developers should be familiar with data communications concepts and have a rudimentary knowledge of the protocols before using these interfaces. click here
• Linux, X.25 and Related Info.
  
  This page contains tidbits relating to X.25 and Frame Relay for Linux. Caveat Emptor: This page is sporadically maintained and incomplete; the last major revision was made in 1997, with only minor changes since then! click here
• Configuring X.25 Services - Bay Networks, Inc.
  
  If you are responsible for configuring and managing Bay Networks® routers, read this guide to learn how to customize Bay Networks router software for X.25 services. click here
• X.25 Overview - From Wikipedia, the free encyclopedia.
  
  A single page and big article on X.25 which covers history, development, architecture, addressing, technical details, Virtual circuits and future. It also points several other usefull resources on the net. click here

X.25 Papers

• X.25 White Papers - ITPapers.com.
  
  ITPapers is the Web's largest library of technical IT white papers, webcasts, and case studies. Covering IT categories including Data Management, IT Management, Networking, Communications, Enterprise Applications, Storage, Security and much more, ITPapers.com is the best source for technical white papers and IT information. A huge list of X.25 white papers, webcasts, and case studies are available to download with a free registration. click here

Online Books

• X.25/9000 Programmer's Guide - Hewlett Packard.
  
  This is an excellent book for programmers of X.25. It discusses the X.25 technology in the perspective of programmer. This book covers general X.25 concepts, X.25 packet formats, with some example programs written in C. click here