IS0 8571 PT*1 88 T2 9%95h50 E06T5h INTERNATIONAL ISO STANDARD 8571-1 First edition 1988-10-01 AMENDMENT 2 1993-08-15 Information processing systems -- Open Systems Interconnection - File Transfer, Access and Management - Part 1 : General introduction AMENDMENT 2 : Overlapped access Systemes de traitement de I'information - Interconnexion de systemes ouverts - Transfert, acces et gestion de fichiers - Partie 1 : Introduction generale AMENDEMENT 2 : Chevauchement d'acces IEC Reference number ISO 8571-1:1988/Amd.2:1993 (E) Copyright International Organization for Standardization Not for Resale d without license from IHS 57* oSI E065h 0545687150 IS0 8571-1:1988/Amd.2:1993 (E) Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. iSO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non- governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEc have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Amendment 2 to International Standard ISO 8571-1:1988 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology. IsO 8571 consists of the following parts, under the general title Information processing systems - Open Systems Interconnection - File Transfer, Access and Management: -Part1:Generalintroduction -Part2:VirtualFilestoreDefinition -Part 3: File Service Definition - Part 4 : File Protocol Specification - Part 5 : Protocol Implementation Conformance Statement Proforma @ISO/EC1993 All rights reserved. No part of this pubication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfim, without permission in writing from the publisher. ISO/EC Copyright Office · Case postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland Not for Resale 4851903 0545688 097 IS0 571 PT*1 8 ISO 8571-1:1988/Amd.2:1993 (E) Information processing systems -- Open Systems Interconnection - File Transfer, Access and Management - Part 1 : General introduction AMENDMENT 2 : Overlapped access other BDT actions, subject to restrictions; this is called 0 Introduction consecutive access. Secondly, read and write actions can be performed in parallel, so that both directions of data Clause O provides an introduction to this amendment. The transfer are exploited at any one time. Requests are then text in this clause is not intended for inclusion in ISO 8571 taken from the queue whenever either direction of transfer part 1. becomes free. This is called concurrent access The transfer of a single FADU, specified in a single F-READ 0.1 General request has the same interpretation as in IsO 8571. The resultant effect on the virtuai filestore of a set of overiapped ISO 8571 part 1 defines in an abstract way the extermally requests using consecutive access shall be the same as visible file transfer, access and management service. that of the equivalent set of requests issued in series; the service provided is serializable. If concurrent access is This amendment extends this service definition to used then the resultant effect of a set of write actions on the incorporate the services offered by overlapped access. virtual filestore, is also serializable. However, due to the non-determinism introduced by the use of concurrent access, it is also possible that in