The third edition of this undergraduate and post-graduate text should be of interest to those needing a grounding in the principles of Open Systems Interconnection. The OSI material in the third edition has been expanded and updated to include the 1988 revision of the Message Handling Systems recommendations, changes to CCR and the acknowledged connectionless LAN logical link control class of procedure. The book is organized into five parts. It begins with a critical analysis of traditional message switching techniques, based on the now defunct BSC protocol, in order to highlight the weaknesses of this approach rather than examine these procedures in detail. This discussion leads naturally to a discussion of protocol structuring and standardization. The second part of the book extends the standardization discussion, containing a chapter on standards organizations and the standards process, followed by detailed discussions of HDLC, X.25 and the "triple X" character terminal handling recommendations. Part Three introduces OSI concepts, such as service primitives and layering, by briefly examining some UK academic interim application protocols.
The reference model itself is then discussed, together with general OSI conventions. To round off this part, the lowest three OSI layers (physical, data link and network) are examined in detail, particular emphasis being placed on local area networks, IEEE project 802 and the relationship of X.25 to OSI. Part Four continues the study of OSI by examining host OSI support for applications, chapters being devoted to the transport, session and presentation layers, as well as the structure of the application layer and the ACSE (1988), CCR (1990), RTSE (1988) and ROSE (1988) application services. The discussion of the presentation layer includes detailed material on ASN.1. Part Five is now entirely devoted to the application layer, and includes a chapter each on the FTAM, JTM, VT and MHS standards, as well as one containing material on registration, formal definition, conformance, profiles, the OSI directory and brief discussions of some other emerging applications such as MMS, ODA, SGML, TP and RDA. The three appendices contain lists of OSI acronyms, ISO OSI standards and CCITT recommendations."synopsis" may belong to another edition of this title.
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