z/OS Communications Server: SNA Network Implementation Guide
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Physical unit

z/OS Communications Server: SNA Network Implementation Guide
SC27-3672-01

Physical units (PUs) exist in type 4, type 5, type 2.0, and type 1 nodes. Combined type 2.0/2.1 nodes, such as a 3174 controller, have both a CP and PU.

A PU provides the following functions:
  • Receives and acts upon requests from CPs, such as activating and deactivating links to adjacent nodes
  • Manages links and link stations while accounting for the unique aspects of different link types
  • Manages network addresses, virtual routes, and explicit routes in type 4 and type 5 nodes
The PU supports sessions with the SSCP in type 5 nodes.
Parent topic: Network accessible units

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