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Formats
Tenth Edition (June 1988)
This is a revision of GA27-3l36-8 1 which is now obsolete.
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(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 request unit.
Chapter 5.2 identifies the formats and meanings of the bytes in a response unit.
Chapter 6 explains the transmission services and function management profiles that
SNA defines to describe session characteristics.
Chapter 7 identifies the formats and meanings of the bytes 1n user-structured
subfields that appear in a request or response unit.
Chapter 8 identifies the formats and meanings of the control vectors, session keys,
and management services vectors that appear in a request or response unit.
Chapter 9 explains the meanings of the sense data defined by System Network
Architecture (SNA) that appear in a negative response units.
Chapter 10 presents the descriptions and formats of the different function
management headers.
Preface 111
Chapter 11 identifies the formats and meanings of the bytes in a presentation
services, header.
Chapter 12 identifies the formats and meanings of the general data stream (GDS)
variables that are specific to SNA service transaction programs.
Chapter 13 identifies the formats and meanings of the message units that SNA
Distribution Services transaction programs use.
ChQPter 14 identifies the general data stream (GDS) variables that are for general
use.
Appendix A provides a summary of SNA character sets and symbol-string types.
Appendix B provides a summary of general data stream identifier (GDS ID) value
assignments.
Appendix C lists the abbreviations and symbols that are used 1n this book.
RELATED PUBLICATIONS
Related publications, providing overview and protocol information, are: