BS 7094:1989 - Open Systems Interconnection: connection-oriented presentation protocol specification
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OSI Layer Coverage:
Covers the Presentation Layer (Layer 6) in the OSI Reference Model.
Focuses on connection-oriented communication, where a logical connection is established and maintained during the data exchange.
Protocol Specification:
Specifies the rules and procedures for the Presentation Protocol (PP) to operate over an existing Session Layer connection.
Includes data structure negotiation, syntax selection, and transfer syntax encoding.
Functionality Provided:
Data formatting and translation (e.g., converting from EBCDIC to ASCII)
Character set negotiation
Data structure negotiation
Abstract and transfer syntax handling
Optional support for compression and encryption (though handled mostly by other layers or application protocols)
Connection-Oriented Model:
Assumes a reliable session connection exists.
Manages dialogue control and presentation context during the lifetime of the session.
Compatibility and Conformance:
Aligns with ISO 8822 and ISO 8823 standards.
Ensures interoperability between heterogeneous systems in open network environments.
Use Cases:
Relevant to applications such as:
Remote file access (e.g., FTAM – File Transfer, Access and Management)
Database access
Network management
Messaging systems
