Communications with Peer-to-Peer SNA Networks

Devices in peer-oriented SNA networks participate in Advanced Peer-to-Peer Networking (APPN). Each APPN device, known as a type 2.1 physical unit (PU 2.1) can communicate directly with other PU 2.1 devices using Advanced Program-to-Program Communications (APPC) sessions.

Each PU 2.1 device relies on its own intelligence and does not require constant access to a centrally located host system.


Although networks that use APPC are usually associated with AS/400 host systems, mainframe systems can also use APPC-based networking.

In an AS/400 environment, APPC is used for a variety of applications including 5250 access and file transfers. Programs that use APPC to communicate are called transaction ...

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