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”)

 

Because TPs are considered users of the network, not components, they

NOTE

 

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.

32

Chapter 1