ISO/IEC INTERNATIONAL STANDARD 9040 Second edition 1997-06-15 Information technology Open Systems Interconnection - Virtual Terminal Basic Class Service (Osi) - Service de classe de base de terminal virtuel IEC ISO Reference number 1.4 ISO/IEC9040:1997(E) ISO/IEC 9040:1997(E) Contents 1 Scope. . 2 Normative references. 3 Definitions..... 2 3.1 Global OSi definitions. . . . 2 3.2 Association Control Service Element definitions 2 3.3 Virtual Terminal Service definitions 2 4 Abbreviations . . 5 4.1 General... 5 4.2 Modes of operation. 5 4.3 VTE model components 4.4 Access-rules . 6 5Conventions. 6 General features . 6 6.1 Introduction. . 6 6.2 Features of the Virtual Terminal Basic Class Service . . 6 6.3 VT Environment (VTE) and VTE-parameters. 6.4 Virtual Terminal Environment Profiles 6.5 Dialogue Control. . . . 7 Communication facilities. : 7.1 Establishment facility . . 7.2 Termination facility 7.3 Negotiation facility 7.4 Data Transfer facility. . 7.5 Delivery Control facility. 7.6 Dialogue Management facility 7.7 Interrupt facilities 7.8 Exception Reporting facility @ ISO/IEC 1997 All rights reserved. Unless otherwise specified no part of this publication may be reproduced or utilized in any fom or by any means, electronic or mechanical, including photocopying andmicrofilm,withoutpermission inwritingfromthepublisher. ISO/IEC Copyright Office · Case Postale 56 · CH-1211 Geneve 20 · Switzerand Printed in Switzerland ii @ ISO/IEC ISO/IEC 9040:1997(E) 8 Modes of operation 8 8.1 S-mode. 8.2 A-mode. . . 8 9 Access-rules 8 10 VT functional units ..... 9 10.1 Negotiation functional units . . 10.2 Negotiated Release functional unit 10.3 Urgent Data functional unit. . . 10 10.4 Break functional unit. 10 10.5 Enhanced Access-rules functional unit 10.6StructuredControlObjectsfunctionalunit.. 10.7 Blocks functional unit . . 10 10.8 Fields functional unit. . 10 10.9 Reference Information Objects functional unit .10 10.10Ripplefunctionalunit. 10.11Exceptionsfunctionalunit 10.12 Context Retention functional unit . 11 11 VT Environment Profiles (VTE-profiles) 11 12 The VTE Model. 11 13Display Objects 12 13.1 Structure. . . 13.2 Attributes 14 Control objects .16 14.1 CO structure facilities and related restrictions .17 14.3 Standard control object for dynamic termination conditions 14.4 Standard control object for notifying termination . . . . .18 14.5 Standard control object for echo control .18 14.6 Standard control object for ripple mode editing .18 15 Reference Information Objects 18 15.1 Structure....... .18 15.2 Generation and use of RIOs .18 16 Device objects .. 19 17 VTE Parameters and directed graph. . 19 17.1 Directed graph of VTE-parameters . 19 17.2 VTE consistency rules . .19 18 Display Object VTE-parameters . 22 18.1 Primary VTE-parameters . . .22 18.2 Secondary VTE-parameters. . 22 18.3 Tertiary VTE-parameter . . 19 Operations on display objects . . 26 19.1 Addressing operations . . .26 19.2 Ripple operations . . . 30 19.3Logicalrippleoperations .31 19.4 Update operations . . 19.5 Access control over display object. . ili @ ISO/IEC ISO/IEC 9040:1997(E) 20 Control object VTE-parameters. . 39 20.1 Usage and effects of control object VTE-parameters 40 20.2 Usage and effects of data element VTE-parameters. . . . . 41 20.3Standardcontrolobjects... 41 21 Reference Information Object VTE-parameters. ... . 46 21.1 Availability. . . . 46 21.2 VTE-parameters for RIOs. 46 22 Operations on RIOs . 47 22.1Availability. 47 22.2 identification of RIO and RIO records 47 22.3 RIO update operations . . . . 47 22.4 RiO reterence operations. 47 23 Device object VTE-parameters . . 48 23.1DefaultcontrolobiectVTE-parameters 48 23.2 Minimum Length VTE-parameters . 48 23.3 Device object VTE-parameters for Attributes. 48 23.4TerminationVTE-parameters. 49 23.5 Interaction between use of TCCO or FDCO and device object VTE-parameters. 50 24 Delivery controi, synchronisation and net-effecting 50 24.1Nodelivery-control 50 24.2 Simple delivery-contr