IBM SNA

Systems Network Architecture

PU - physical unit

 * PU5: subarea node with SSCP (S/390, AS/400)
 * PU4: subarea node without SSCP (Communications Controller 37xx)
 * PU2.1: peripheral node, programmable, APPN (AS/400, ES, 3174 opt., 6611)
 * PU2.0: peripheral node, programmable (Cluster Controller, 3174, 3274)
 * PU1: peripheral node, non-programmable (Terminal Controller, 6670)

LU - logical unit

 * LU0 -
 * LU1 - SCS printer
 * LU2 - SNA display
 * LU3 - SNA printer
 * LU4 - SCS terminal
 * LU6 - application to application
 * LU7 - 5250 terminal to application

Publications

 * Stephen J. Randesi; Donald H. Czubek: SNA: IBM's Systems Network Architecture - Van Nostrand Reinhold 1991, ISBN 0-442-00504-0