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OSI address

The OSI network address consists of up to 20 octets and is used to locate an OSI transport instance.

The OSI address is formatted in two parts: the Initial Domain Part( IDP), which is standardized for various address domains, and the Domain Specific Part( DSP), which forms the addressing authority for that domain.

The OSI address for the presentation layer is used to address the application instance. It consists of the OSI network address and up to three selectors, one each for the transport, session and presentation instance.


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