IBM GA27-3136-9 SNA Formats Jun88 free download

File name GA27-3136-9_SNA_Formats_Jun88.pdf

---- - - - -.- - --_- ------ Systems Network Architecture - GA27-3136-9 - - - --- ----- Formats ---- ------ - - -- - -- - --- - - Systems Network Architecture GA27-3136-9 ----- ---,- ,R) Formats Tenth Edition (June 1988) This is a revision of GA27-3l36-8 1 which is now obsolete. It is possible that this material may contain references tO or information about, I IBM products (machines and programs) or services that are not announced in your country. Such references or information must not be construed to mean that IBM intends to announce such IBM products .or serVlces ln your country. The following paragraph does not apply to the United Kingdom or any country where such provisions are inconsistent with local law: INTERNATIONAL BUSINESS MACHINES CORPORATION PROVIDES THIS PUBLICATION "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. In the United States, some states do not allow disclaimer of express or implied warranties in certain transactions; therefore, this statement may not apply to you. Publications are not stocked at the address given below; the licensed documents are available to customers that have a product license. A form for reader's comments is provided at the back of this publication. If the form has been removed, comments may be addressed to IBM Corporation, Information and Interface Development Support, Department E01, P. O. Box 12195 1 Research Triangle Park, North Carolina U.S.A. 27709. IBM may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligation whatever. You maYI of course, continue to use the information you supply. (c) Copyright International Business Machines Corporation 1977 1 1988. All rights reserved. PREFACE ABOUT THE BOOK This book describes the Systems Network Architecture (SNA) formats used between subarea nodes and peripheral nodes, and between type 2.1 nodes using peer-to-peer protocols. HOW THIS BOOK IS ORGANIZED This book identifies the formats and meanings of the bytes that a basic link unit (BLU) contains. A BLU is the basic unit of transmission at the data link and link station level. The figure on page vii illustrates the organization of this book. Chapter 1 identifies the formats and meanings of the bytes in a link header and a link trailer. Chapter 2 identifies the formats and meanings of the information-field bytes 1n an SDLC and System/370 DLC Exchange Identification (XID) command and response. Chapter 3 identifies the formats and meanings of the bytes 1n a transmission header. Chapter 4 identifies the formats and meanings of the bytes 1n a request or response header. Chapter 5.1 identifies the formats and meanings of the bytes in a re