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32 Chapter 1
SNA Terms and Concepts
Basic SNA Concepts
• CPI-C (Common Programming Interface for Communications)—LU
type 6.2 only
• CSV (Common Service Verb) API
• HLLAPI (high-level language application programming
interface)—as part of the SNAplus2 3270 emulation program
• LUA API
In addition, SNAplus2 includes the following proprietary programming
interfaces (only for HP-UX systems):
• MS (Management Services) API
• NOF (Node Operator Facility) API
For an overview of the APIs provided with SNAplus2, see “Application
Programming Interfaces”.
Network Accessible Units
Communication between a TP and the SNA network occurs through
network accessible units or NAUs (formerly called “network addressable
units”), which are unique network resources that can be accessed
(through unique local addresses) by other network resources.
SNA provides the following types of NAUs:
• Physical units (see “Physical Units”)
• Logical units (see “Logical Units”)
• Control points (see “Control Points”)
NOTE Because TPs are considered users of the network, not components, they
are not classified as NAUs.
Physical Units
Each SNA node contains a physical unit (PU). The PU manages
resources (such as link resources) and supports communication with a
host.