IBM SNA

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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