1、DRAFT FOR DEVELOPMENT DD ENV 41502:1991 Implementation of ENV41502:1991 Information Systems Interconnection Character repertoires for information received from or transmitted to the Teletex Service or private information processing systems using Teletex technologyDDENV41502:1991 This Draft for Devel
2、opment was published under the authority ofthe Standards Board and comesinto effect on 30September1991 BSI04-2000 The following BSI reference relates to the work on this Draft for Development: Committee reference IST/2 ISBN 0 580 20134 1 Cooperating organizations The joint European Standards Institu
3、tion (CEN/CENELEC), under whose Supervision this European Prestandard was prepared, comprises the National Committees of the following countries: Austria Italy Belgium Luxembourg Denmark Netherlands Finland Norway France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom
4、 Amendments issued since publication Amd. No. Date CommentsDDENV41502:1991 BSI 04-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of ENV41502:1991 3DDENV41502:1991 ii BSI 04-2000 National foreword This Draft for Development is identical with the
5、 European Prestandard ENV41502:1991 “Information Systems Interconnection Character repertoires for information received from or transmitted to the Teletex Service or private information processing systems using Teletex technology” prepared by CEN/CENELEC whose members have committed themselves to ma
6、king it available in an appropriate form. In the UK the Draft for Development is the form now chosen for ENVs in the information technology area. This Draft for Development is published under the direction of the Information Systems Technology Standards Policy Committee whose Technical Committee IST
7、/2 has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on interpretation, or proposals for change, and to keep UK interests informed; monitor related international and European developments and promulgate them in
8、the UK. NOTEInternational and European Standards, as well as overseas standards, are available from BSI Sales Department, BSI, Linford Wood, Milton Keynes, MK146LE. After two years this ENV will be reviewed by CEN/CENELEC members with a view to its: conversion into a European Standard (which would b
9、e implemented in the UK as a BritishStandard); extension once for a further two years; replacement by a revised ENV (which would be published in the UK as a revised Draft for Development); withdrawal. The future of this Draft for Development is therefore bound to that of the ENV and the Draft for De
10、velopment will not be reviewed or developed separately. This publication is not to be regarded as a BritishStandard. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theENV title page, pages2 to6 and a back cover. This standard has been updated (see copyri
11、ght date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN PRESTANDARD PRENORME EUROPEENNE EUROPISCHE VORNORM ENV41502:1991 June1991 UDC 681.327.8:621.397.48:003.62 Descriptors: Data processing, Teleprocessing, Information int
12、erchange, Data transmission, Teletex, Character sets, Coded character sets, Graphic characters, Directories, Codification English Version Information Systems Interconnection Character repertoires for information received from or transmitted tothe Teletex Service or private information processing sys
13、tems using Teletex technology Interconnection de systmes dinformation Rpertoires et codage de caractres graphiques pour linterfonctionnement avec les services Teletex de la CEPT Kommunikation von Informationssystemen Schriftzeichenvorrat und Codierung fr die Zusammenarbeit mit CEPT Teletex-Diensten
14、This European Prestandard (ENV) was approved by CEN/CENELEC on1991-05-15 as a prospective standard for provisional application. The period of validity of this ENV is limited initially to three years. After two years the members of CEN/CENELEC will be requested to submit their comments, particularly
15、on the question whether the ENV can be converted into an EN. CEN/CENELEC members are required to announce the existence of this ENV in the same way as for an EN and to make the ENV available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards i
16、n force (in parallel to the ENV) until the final decision about the possible conversion of the ENV into an EN is reached. CEN/CENELEC members are the national standards bodies and national committees, respectively, of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Ita
17、ly, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN/CENELEC The Joint European Standards Institution Organisation Commune Europenne de Normalisation Die Gemeinsame Europische Normungsorganisation Central Secretariat: rue de Stassart 36, B-1050 Brussels CE
18、N/CENELEC1991 Copyright reserved to all CEN and CENELEC members Ref. No. ENV41502:1991 EENV41502:1991 BSI 04-2000 2 Foreword This European Prestandard (ENV) was developed by the working group CEN/CENELEC/IT/WG CSC (secretariat held by SIS) and originally adopted by the CEN/CENELEC members on87-01-08
19、. The Two-Review Enquiry on the ENV was started by the CEN/CENELEC CS on89-01-30, the conclusion of which was for WG CSC to revise the standard. The revised standard was voted upon at a CEN/CENELEC voting meeting. The result of the voting from the meeting, held on91-04-16, was positive and the revis
20、ed document has consequently been accepted as a European Prestandard. Contents Page Foreword 2 0 Introduction 3 1 Scope and field of application 3 2 References 3 2.1 Base references 3 2.2 Additional references 3 3 Definitions 3 4 Abbreviations 3 5 Scenario description 3 6 Conformance 4 7 Character r
21、epertoires 5 7.1 Latin repertoire for the Teletex Service 5 7.2 Latin repertoire for private Teletex systems 5 7.3 Optional supplementary Greek alphabetic repertoire 5 8 Identification of options 5 Annex A Difference from the ENV41502 of March1987 6ENV41502:1991 BSI 04-2000 3 0 Introduction The conc
22、ept and structure of Functional Standards for Information Systems Interconnection are laid down in the CEN/CENELEC/ETSI Memorandum M-IT-01. The purpose of a Functional Standard is to recommend when and how certain information technology standards should be used. This Functional Standard specifies th
23、e character repertoire defined as S/15 in the CEN/CENELEC/ETSI Memorandum M-IT-02 and an additional Greek repertoire. 1 Scope and field of application This Functional Standard is intended to be used with and identified within other functional standards that specify strings of coded graphic character
24、s forming the information received from or transmitted to the Teletex service, or for use in private information processing systems using Teletex technology. This Functional Standard shall be used in conjunction with ENV41506. 2 References 2.1 Base references CCITT Recommendation T.61, Character rep
25、ertoire and coded character sets for the international Teletex service(1988). ETS300015, Terminal equipment; requirements for teletex terminal equipment participating in the teletex service (in preparation). ENV41503, Information systems interconnection; European graphic character repertoires and th
26、eir coding(1991). ENV41505, Information systems interconnection; Character repertoire and coding for line drawing(1991). ENV41506, Information systems interconnection; Data stream formats for information received from or transmitted to the Teletex Service or private information processing systems us
27、ing Teletex technology(1991). 2.2 Additional references M-IT-01, CEN/CENELEC/ETSI Memorandum on the Concept and Structure of Functional Standards for Information Technology (March1986). M-IT-02, CEN/CENELEC/ETSI Memorandum on Directory of Functional Standards (forth issue, August1989). CEN/CENELECRe
28、port R-IT-04, Information systems interconnection; Code transformation functions and gateway functions between information processing systems and public telematic services. 3 Definitions The terms used in this Functional Standard are defined in the references. 4 Abbreviations The abbreviations used
29、in this Functional Standard are defined in the references. 5 Scenario description With the field of application as stated in section1, the scenario for this Functional Standard is as follows: This Functional standard specifies four different character repertoires.ENV41502:1991 4 BSI 04-2000 5.1 Repe
30、rtoire Option A is intended to be used for information to be received from or transmitted to the Teletex Service, comprising Latin alphanumeric and special graphic characters. 5.2 Repertoire Option B is intended to be used in private information processing systems using teletex technology. It compri
31、ses Latin alphanumeric and special graphic characters. 5.3 Either of the repertoires Option A or Option B can be combined with a supplementary repertoire of Greek alphabetic characters. Repertoire Option C comprises a Latin and Greek repertoire to be used for information to be received from or trans
32、mitted to the Teletex Service, and repertoire Option D the Latin and Greek repertoire to be used in private information processing systems using teletex technology. NOTEThis Functional Standard does not describe the Teletex service. In the preparation of this Functional Standard the specifications o
33、f Teletex was assumed to be as in ETS300015. 6 Conformance 6.1 Conformance of information interchange A CC-data-element within coded information for interchange is in conformance with this Functional Standard if all the coded representations of characters within that CC-data-element conform to the r
34、equirements of clause7 of this Functional Standard. A claim of conformance shall identify the option adopted as specified in clause8. 6.2 Conformance of devices A device is in conformance with this Standard if it conforms to the requirements of6.2.1, and either or both of clauses6.2.2 and6.2.3 below
35、. A claim of conformance shall identify the documents which contains the description specified in clause6.2.1 and shall identify the option adopted. 6.2.1 Device description A device that conforms to this Functional Standard shall be the subject of a description that identifies the means by which th
36、e user may supply characters to the device, or may recognize them when they are made available to him, as specified respectively in clauses6.2.2 and6.2.3 below. 6.2.2 Originating devices An originating device shall allow its user to supply any sequence of characters conforming to the adopted option
37、of this Functional Standard, and shall be capable of transmitting their coded representations within a CC-data-element. 6.2.3 Receiving device A receiving device shall be capable of receiving and interpreting any coded representation of characters that are within a CC-data-element, and that conforms
38、 to clause6.1 of this Functional Standard, and shall make the corresponding characters available to its user in such a way that its user can identify them from among those of the adopted option, and can distinguish them from each other. The conformance clauses rely on the following generalized defin
39、itions: CC-data-element: An element of interchanged information that is specified to consist of sequences of coded representations of characters, in accordance with one or more identified standards of coded character sets. Device: A component of information processing equipment which can transmit, a
40、nd/or can receive, coded information within CC-data-elements. (It may be an input/output device in the conventional sense, or a process such an application program or gateway function.) User: A person or other entity that invokes the services provided by a device. (This entity may be a process such
41、as an application program if the “device” is a code convertor or a gateway function, for example.)ENV41502:1991 BSI 04-2000 5 7 Character repertoires 7.1 Latin repertoire for the Teletex Service The Latin repertoire for the Teletex service (repertoire Option A) comprises308 graphic characters as fol
42、lows: the234 Latin alphabetic characters, and the74 non-alphabetic characters, listed in clauses3.2.2 and3.2.3 of CCITT Recommendation T.61. 7.2 Latin repertoire for private information processing systems using teletex technology The Latin repertoire for private information processing systems using
43、teletex technology (repertoire OptionB) comprises347 graphic characters: the308 characters according to clause7.1 of this Functional Standard, the following10characters from the repertoire denoted as S/14in ENV41503: the29 linedrawing characters denoted as repertoire S/18 in ENV41505. 7.3 Optional s
44、upplementary Greek alphabetic repertoire The supplementary Greek alphabetic repertoire comprises70characters: the69 Greek alphabetic characters according to clause E.3.1.1.3.2 of CCITT Recommendation T.61, the diacritical mark DIAERESIS WITH ACUTE ACCENT used as a separate graphic character. The sup
45、plementary Greek alphabetic repertoire is used together with either the repertoire of clause7.1 (forming repertoire Option C), or with the repertoire of clause7.2 (forming repertoire Option D). 8 Identification of options If a reference to this Functional Standard is made for specification purposes
46、in another Functional Standard, the repertoire shall be clearly identified. The following table summarizes the options defined by this Functional Standard. SM07 REVERSE SOLIDUS SM11 LEFT CURLY BRACKET SM14 RIGHT CURLY BRACKET NS01 1 SUPERSCRIPT ONE SM53 (R) REGISTERED SIGN SM52 (C) COPYRIGHT SIGN SM
47、66 NOT SIGN SP31 NBSP NON-BREAK SPACE SP32 SHY SOFT HYPHEN SM65 | BROKEN BAR Option reference Repertoire A B C D Latin repertoire for interworking with the Teletex service Latin repertoire for private information processing systems using teletex technology Latin/Greek repertoire for interworking wit
48、h the Teletex service Latin/Greek repertoire for private information processing systems using teletex technologyENV41502:1991 6 BSI 04-2000 Annex ADifferences from the ENV41502 of March1987 (Not part of the Functional Standard) This Functional standard differs from the earlier version of ENV41502 of
49、 March1987 in the following main respects: The term “interworking with” is changed to “information received from or transmitted to” Four different options of character repertoires have been specified: Option A is intended for use with the public Teletex service and comprises all characters required by the CCITT Recommendation of1988 Option B is intended for use with private information processing systems which use teletex technology. It includes the10 special characters required to make the repertoire a superset of reper
