Overview
ISO 8571-4:1988/Amd 1:1992 is an amendment to the ISO standard for FTAM (File Transfer, Access and Management) within the OSI (Open Systems Interconnection) framework. Titled “File Protocol Specification - Amendment 1: Filestore Management,” this document revises the original Part 4 by amending the Introduction, adding initiating and responding entity actions to subclauses 8.2 and 9.2, and replacing Section 5 (Abstract Syntax) and Annex A (Protocol State Table). The amendment was prepared by ISO/IEC JTC 1 and published in 1992.
Key topics and technical requirements
- Filestore management extensions
- Adds enhanced and limited filestore-management functional units and detailed actions such as Reference Creation, Reference Deletion, Read/Change Reference Attributes, and List File Directory.
- Introduces group- and object-level operations (e.g., Group Selection, Group Move/Copy/List/Delete, Move/Copy Object, Select-Another Object).
- Protocol behavior
- Specifies new initiating and responding entity actions tied to the FTAM state machine; these actions are detailed in the revised Annex A (state table).
- Notes on default parameter behavior (examples in the ASN.1 module include defaults such as Checkpoint-window).
- Abstract syntax (ASN.1) updates
- Replaces Section five with an updated ASN.1 module that modifies the PDU structure (adds or refines choices like FSM-PDU) and extends bit-string definitions for Service-Class, Functional-Units, and Attribute-Groups.
- Updates definitions for FTAM PDUs (F-INITIALIZE, F-SELECT, F-CREATE, F-OPEN, etc.) to reflect the new filestore and group/object manipulation operations.
- Conformance and implementation notes
- The amendment clarifies when certain parameters may be sent (e.g., limited-filestore-management or group-manipulation flags) and that some attributes (like passwords) are excluded from read operations by design.
Practical applications
- Enables interoperable file transfer, access and filestore management across heterogeneous OSI-based systems.
- Provides protocol-level rules required when implementing FTAM stacks that support enhanced file-system-like operations (directory listing, object/group manipulation, attribute management).
- Useful for organizations maintaining legacy OSI/FTAM environments or integrating systems that must adhere to ISO 8571 protocol semantics.
Who should use this standard
- Network protocol engineers and implementers of FTAM/OSI application-layer products
- System integrators and vendors supporting legacy interoperable file services
- Test labs and conformance testers creating Protocol Implementation Conformance Statements (PICS)
- Researchers and archivists studying historical OSI file service protocols
Related standards
- ISO 8571 (other parts: Part 1 General introduction, Part 2 Virtual Filestore, Part 3 File Service Definition, Part 5 PICS proforma)
- ISO/IEC JTC 1 outputs related to OSI application services
Keywords: ISO 8571-4, FTAM protocol, filestore management, ASN.1, PDU, OSI file transfer, file access, file management, group manipulation.
Open preview (PDF)Information processing systems — Open Systems Interconnection — File Transfer, Access and Management — Part 4: File Protocol Specification — Amendment 1: Filestore Management
