1、- CEN ENVa41502 91 m 3404589 0025797 O m EUROPEAN PRESTANDARD PRENORME EUROPEENNE EUROPAISCHE VORNORM ENV 41502:1991 June 1991 UDC: 681.327.8:621.397.48:003.62 Descriptors: Data processing, Teleprocessing, Information interchange, Data transmission, Teletex, Character sets, Coded character sets, Gra
2、phic characters, Directories, Codification English. Version Information Systems Interconnection - Character repertoires for information received from or transmitted to the Teletex Service or private information processing systems using Teletex technology e. Interconnection de systmes dinformation -
3、Rpertoires et codage - Schriftzeichenvorrat und Codierung de caractres graphiques pour linterfonctionnement avec les services Teletex-Diensten Teletex de la CEPT Kommunikation von Informationssystemen fr die Zusammenarbeit mit CEPT This European Prestandard (ENVI was approved by CENCENELEC on 1991-0
4、5-15 as a prospective ENV is limited initially to three years. After two years the members of CENICENELEC will be requested to submit their comments, particularly on the question whether the ENV can be converted into an EN. standard for provisional application. The period of validity of this CENICEN
5、ELEC 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 in force (in parallel to the ENVI until the final decision about the
6、possible conversion of the ENV into an EN is reached. CENICENELEC members are the national standards bodies and national committees, . respectively, of Austria, Belgium, Denmark, Finland, France, Germany, Greece, .Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swi
7、tzerland and United Kingdom. CENCENELEC The joint European Standards Organization Organisation Commune Europenne de Normalisation Die Gemeinsame Europische Normungsorganisation Central Secretariat: rue de Stassart, 36 B-1050 Brussels (cl CENCENELEC 1991 Ref. No. ENV 41502:1991 E Copyright reserved t
8、o all CEN and CENELEC members CEN ENV*41502 91 3404589 0025798 2 Page 2 ENV 41502:1991 FOREWORD This European Prestandard (ENVI was developed by the working group CEN/CENELEC/IT/WG CSC (secretariat held by SIS) and originally adopted by the CEN/CENELEC members on 87-01-08. The Two-Review Enquiry on
9、the ENV was started by the CEN/CENELEC CS on 89-01-30, the conclusion of which was for WG CSC to revise tne standard. The revised standard was voted upon at a CEN/CENELZC voting meeting. The recuit of the voting from the meeting, held on 91-04-16, was positive an6 the revised document has consequent
10、ly been accepted as a European Prestandard. CEN ENVP4L502 71 3404587 0025797 4 = Page 3 ENV 41502:1991 Contents page O INTRODUCTION . 4 1 SCOPE AND FIELD OF APPLICATION . 4 2 REFERENCES .- 4 2.1 Base references 4 2.2 Additional references 4 3 4 5 6 7 7.1 7.2 7.3 8 DEFINITIONS 5 ABBREVIATIONS 5 SCENA
11、RIO DESCRIPTION . 5 CONFORMANCE 6 CHARACTER REPERTOIRES 7 Latin repertoire for the Teletex Service . 7 Latin repertoire for private Teletex systems . 7 Optional supplementary Greek alphabetic repertoire 7 IDENTIFICATION OF OPTIONS 8 ANNEX A Difference from the ENV 41502 of March 1987 9 - CEN ENV*415
12、02 91 = 3404589 0025800 7 Page 4 ENV 41502:1991 O INTRODLICTION The concept 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 te
13、chnology standards should be used. This Functional Standard specifies the 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 ot
14、her functional standards that specify strings of coded graphic characters 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 ENV 41 506.
15、 2 REFERENCES 2.1 Base re?erences CCITT Recommendation T.61: Character repertoire and coded character sets for the international Teletex service (1988). ETS 300 015: Terminal equipment; requirements for teletex terminal equipment participating in the teletex service (in preparation) ENV 41503 : Info
16、rmation systems interconnection; European graphic character repertoires and their coding (19911 ENV 41505: Information systems interconnection; Character repertoire and coding for line drawing (1991) ENV 41506: Information systems interconnection; Data stream formats for information received from or
17、 transmitted to the Teletex Service or private information processing systems using Teletex technology (1991 1 2.2 Additional references M-IT-O 1 : CEN/CENELEC/ETSI Memorandum on the Concept and Structure of Functional Standards for Information Technology (March 1986) M-I T-O 2 : CEN/CENELEC/ETSI Me
18、morandum on Directory of Functional Standards (forth issue, August 1989) CEN/CENELEC Report R-IT-04: Information systems interconnection; Code trans- formation functions and gateway functions between information processing systems and public telematic services CEN ENV*41502 91 m 3404589 0025801 9 m
19、IPS ! Trans- ! Teletex ! Trans- ! formation network formation I 1 I module !. I module Page 5 ENV 41502:1991 IPS 2 3 DEFINITIONS The terms used in this Functional Standard are defined in the references, 4 ABBREVIATIONS The abbreviations used in this Functional Standard are defined in the references,
20、 5 SCENAIO DESCRIPTION With the field of application as stated in section 1, the scenario for this Functional Standard is as follows: This Functional standard specifies four different character repertoires, 5.1 5.2 5.3 Note : Repertoire Option A is intended to be used for information to be received
21、from or transmitted to the Teletex Service, comprising Latin alphanumeric and special graphic characters. Repertoire Option B is intended to be used in private information processing systems using teletex technology. alphanumeric and special graphic characters, Either of the repertoires Option A or
22、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 infor- mation to be received from or transmitted to the Teletex Service, and repertoire Option D the Latin and Greek repertoire to be use
23、d in private information processing systems using teletex technology. It comprises Latin This Functional Standard does not describe the Teletex service. In the preparation of this Functional Standard the specifications of Teletex was assumed to be as in ETS 300 015, CEN ENV*41502 91 3404589 0025802
24、O = Page 6 ENV 41502:1991 6 CONFORMANCE 6.1 Conformance of infomation 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 requirements of claus
25、e 7 of this Functional Standard. A claim of conformance shall identify the option adopted as specified in clause 8. 6.2 Conformaace of devices A device is in conformance with this Standard if it conforms to the requirements of 6.2.1, and either or both.of clauses 6.2.2 and 6.2.3 below. A claim of co
26、nformance shall identify the documents which contains the description specified in clause 6.2.1 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 the user may sup
27、ply characters to the device, or may recognize them when they are made available to him, as specified respectively in clauses 6.2.2 and 6.2.3 below. 6.2.2 Originating devices An originating device shall allow its user to supply any sequence of characters conforming to the adopted option of this Func
28、tional 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 to clause 6
29、.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 definitions: CC-
30、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, and/or can
31、receive, coded information within CC-data-elements. (It may be an input/output device in the conventional sense, or a process such an 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 as an a
32、pplication program if the “device“ is a code convertor or a gateway function, for example.) - CEN ENVM41502 91 3404589 0025803 2 W Page 7 ENV 41502:1991 7.1 Latin repertoire for the Teletex Service The Latin repertoire for the Teletex service (repertoire Option A) comprises 308 graphic characters as
33、 follows: - the 234 Latin alphabetic characters, and the 74 non-alphabetic characters, listed in clauses 3.2.2 and 3.2.3 of CCITT Recommendation T.61. 7.2 Latin repertoire for private information processing systems using teletex techno1 ogy The Latin repertoire for private information processing sys
34、tems using teletex technology (repertoire Option B) comprises 347 graphic characters: - the 308 characters according to clause 7.1 of this Functional Standard, - the following 10 characters from the repertoire denoted as S/14 in ENV 41 503: SM07 SM11 SM14 NSO1 . SM53 (R) SM52 (CI SM66 1 SP31 NBSP SP
35、32 SHY SM65 REVERSE SOLIDUS LEFT CURLY BRACKET RIGHT CURLY BRACKET SUPERSCRIPT ONE REGISTERED SIGN COPYRIGHT SIGN NOT SIGN NON-BREAK SPACE SOFT HYPHEN BROKEN BAR - the 29 linedrawing characters denoted as repertoire SI18 in ENV 41 505, 7.3 Optional supplementary Greek alphabetic repertoire The suppl
36、ementary Greek alphabetic repertoire comprises 70 characters: - the 69 Greek alphabetic characters according to claues 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 supplementary Greek alphabetic repertoire is u
37、sed together with either the repertoire of clause 7.1 (forming repertoire Option Cl, or with the repertoire of clause 7.2 (forming repertoire Option DI. CEN ENV*4L502 91 3404589 0025804 4 m Page 8 ENV 41502:1991 8 IDENTIFICATION OF OPTIONS If a reference to this Functional Standard is made for speci
38、fication purposes in another Functional Standard, the repertoire shall be clearly identified. The following table summarizes. the options defined by this Functional Standard, Option reference A B C D Repertoire Latin repertoire for interworking with the Teletex service Latin repertoire for private i
39、nformation proces- sing systems using teletex technology LatinlGreek repertoire for interworking with the Teletex service Latin/Greek repertoire for private infomation processing systems using teletex technology CEN ENV*41502 91 W 3404589 0025805 b = Page 9 ENV 41502: i991 Annex A (Not part of the F
40、unctional Standard) DIFFERENCES FROM THE ENV 41502 OF MARCH 1987 This Functional standard differs from the earlier version of ENV 41502 of March 1987 in the following main respects: - The term “interworking with“ is changed to “information received from - Four different options of character repertoi
41、res have been specified: - Option A is intended for use with the public Teletex service and com- prises all characters required by the CCITT Recommendation of 1988 - Option B is intended for use with private information processing systems which use teletex technology. It includes the 10 special char
42、acters required to make the repertoire a superset of repertoire S/14 (the basic-1 repertoire) in ENV 41503, as well as the linedrawing .repertoire S/18 in ENV 41505. of the preceding options, according to the provision for Standardized Options in Annex E of CCITT Recommendation T.61, in ENV 41 506. or transmitted to“ - A Greek alphabetic repertoire may optionally be combined with either - The coding method(s) are not specified in this Functional Standard but For a general discussion of coding methods, as well as the differences between the repertoires, refer to CEN/CENELEC Report R-IT-04.
