HP CommonIO Products Instrukcja Użytkownika Pobierz pdf (Strona 18)

About the X.25 Product

Application (L7), Presentation (L6), and Session (L5) Levels

Chapter 118

Application (L7), Presentation (L6), and

Session (L5) Levels

The X.25 link does not provide any components for the general support of

the application and presentation levels (levels 7 and 6, respectively),

although X.25/9000 PAD Services do provide some of the functionality of

these levels.

User-written application programs, Internet Services/Berkeley Services

(via BSD Sockets) and NS (via NetIPC Sockets), are accessed by means

of TCP or UDP Transport Level (level 4) protocols.

For application level services, you can install OSI Services to run over

the X.25 network (for more information, refer to OSI Services

documentation). The OTS/9000 product provides access to X.25 for OSI

Services. You can install application level services such as

Internet/Berkeley Services and Network Services (for more information,

refer to the documentation for these products).

BSD IPC (Berkeley Software Distribution InterProcess Communication)

allows direct programmatic access to the X.25 packet level (level 3), or

TCP/UDP at the transport level (level 4), for user-written application

programs.

NetIPC sockets also provides a programmatic interface to TCP/UDP at

the transport level.

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HP CommonIO Products Instrukcja Użytkownika Strona 18