Presentation Services Layer

The presentation services (PS) layer of SNA contains the function that presents the communications data interface to the user. The presentation services layer is defined in the architecture for all LU types except LU 0. LUA contains a unique subset of the presentation services layer within Personal Communications. For more information about the presentation services layer, refer to Systems Network Architecture Concepts and Products.

The LU services functions are a part of the SNA-session message flow layers. These functions supply support before session establishment, build session structures, and take down session structures. LUA functions interface with common Personal Communications and Communications Server support to define LUs and to start and stop SNA sessions.