AS/NZS 3646.4:1993

Defines the basic protocol which supports the internal file service, and the error recovery protocol which supports the external file service. This Standard is identical with and has been reproduced from ISO 8571-4:1988 and includes Amendment 1:1992.

ISO 8571-4 consists of four main sections:a) the basic protocol (in sections two and three), which supports the internal file service;b) the error recovery protocol (in section four), which supports the external file service; For each of these, ISO 8571-4 includes a formal statement of the nature of the automaton giving the necessary behaviour of each of the participating entities. It states:1) the actions to be taken on receiving request and response primitives issued by a file service user;2) the actions to be taken on receiving indication and confirm primitives issued by the Presentation Service provider;3) the actions to be taken as a result of events within the local system.c) the definition (in section five) of the abstract syntax required to convey the file protocol control information.d) the conformance requirements to be met by implementors of this protocol (in section six).The scope of the File Protocol is limited to the interconnection of systems; it does not specify or restrict the possible implementation of interfaces within a computer system.Field of applicationThe purpose of ISO 8571-4 within the OSI scheme is to specify the behaviour which must be exhibited by a system in order to take part in the provision of the file transfer access and management service.The file protocol specification references three service definitions in order to express the environment within which it is applied. ISO 8571-3 defines the aims and objectives that the protocol must achieve. The Presentation Service (ISO 8822) and ACSE Service (ISO 8649-2) define the set of assumptions about the supporting facilities which the protocol may exploit (see figure 1).

First published as Joint Australian/New Zealand Standard AS/NZS 3646.4:1993.