Information technology; international standardized profiles AFTnn; file transfer, access and management; part 3: AFT 11; simple file transfer service (unstructured) (ISO/IEC/ISP 10607-3:1990, modified)

This technical specification outlines the architectural and functional requirements for a specific subset of document exchange protocols within the realm of information technology. The document establishes the rules governing the transmission, retrieval, and management of data files using a simplified service model designed for unstructured content. It defines the operational procedures for establishing communication sessions, handling error conditions during data transfer, and ensuring the integrity of exchanged documents across diverse network environments. The framework supports the exchange of information between heterogeneous systems by providing a standardized interface that abstracts lower-level network complexities. Key aspects include the definition of message formats, control sequences, and state transitions necessary for successful file delivery. This specification serves as a reference for implementing interoperable services that facilitate efficient data movement without requiring complex structural constraints on the transmitted content. It addresses the fundamental mechanisms needed to ensure reliable communication in environments where structured metadata may be absent or variable, focusing on the core capabilities required for basic document transport and management operations within the broader ecosystem of international protocol standards.