HP -UX SNAplus2 Manual do Utilizador descarregar pdf (Página 40)

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40 Chapter 1

SNA Terms and Concepts

Basic SNA Concepts

As shown in Figure 1-3, “Communication between Transaction Programs

and Logical Units,” information is exchanged between TPs and LUs to

enable one node to communicate with another. Although the TPs appear

to be communicating directly, the LUs on each node are the

intermediaries in every exchange.

Figure 1-3 Communication between Transaction Programs and Logical

Units

SNA deﬁnes two types of conversations: basic and mapped. These two

types of conversations use different methods to indicate the length of

transmitted or received data packages to be passed between SNAplus2

and the TP.

• In a basic conversation, data must be formatted by the TP as logical

records before being presented to the SEND function.

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