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SNA Terms and Concepts
Basic SNA Concepts
Each node connected to a network has one or more link stations, which
are the hardware and software in a node that control data flow to a
specific adjacent node. To establish communication between two adjacent
nodes, one of the link stations must first activate the link between the
nodes.
Transaction Programs
Programs that exchange information across the SNA network are called
transaction programs (TPs).
Following are examples of application programs that can include SNA
TPs:
• Emulation programs
• File transfer
• Database transaction processing
• Network management
• Centralized data services
The TP accesses the network through a logical unit (LU) that establishes
and maintains a session with a partner LU on another node. For more
information about logical units, see "Logical Units".
NOTE
SNAplus2 includes sample TPs for most supported APIs. For more
information on sample TPs, refer to the programmer's guide for the API.
You can also purchase SNA TPs as part of other products or create your
own TPs (see "Application Programming Interfaces").
Application Programming Interfaces
SNA TPs are written using application programming interfaces (APIs).
APIs provide specific subroutines that enable SNA TPs to access SNA
functions, such as those for exchanging data and performing control
functions. These subroutines enable an SNA TP to communicate with
another SNA TP on a remote node.
SNAplus2 includes the following APIs on all platforms:
• APPC—LU type 6.2 only
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