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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1922 : 1998 The Eur
2、opean Standard EN 1922 : 1997 has the status of a British Standard ICS 35.040 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Information technology Character repertoire and coding for interworking with Telex services Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:5
3、1:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the DISC Board, was published under the authority of the Standards Board and comes into effect on 15 February 1998 BSI 1998 ISBN 0 580 28883 8 BS EN 1922 : 1998 Amendments issued since
4、publication Amd. No.DateText affected National foreword This British Standard is the English language version of EN 1922 : 1997. It supersedes DD ENV 41504 : 1991 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee IST/2, Character Sets and Information Co
5、ding, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in
6、the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled
7、 International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN
8、title page, pages 2 to 6, an inside back cover and a back cover. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:51:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretar
9、iat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1922 : 1997 E EUROPEAN STANDARDEN 1922 NORME EUROPE ENNE EUROPA ISCHE NORM September 1997 ICS 35.040.70; 35.040 Descriptors: Data process
10、ing, teleprocessing, information interchange, data transmission, telex, coded character sets, directories, codification English version Information technology Character repertoire and coding for interworking with Telex services TechnologiesdelinformationRe pertoiredes caracte res et codage pour lint
11、eraction avec les services te lex Informationstechnik Zeichenvorrat und Codierung fu r die Zusammenarbeit mit Telex-Diensten This European Standard was approved by CEN on 15 August 1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givi
12、ng this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versi
13、ons (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, C
14、zech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:51:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 1922 : 199
15、7 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 304, Character Set Technology, the secretariat of which is held by STRI. This European Standard supersedes ENV 41504 : 1990 (drawn up by CEN/CENELEC/IT/ WG-CSC). This European Standard shall be given the statu
16、s of a national standard, either by publication of an identical text or by endorsement, at the latest by March 1998, and conflicting national standards shall be withdrawn at the latest by March 1998. This standard is available in English and German only. According to the CEN/CENELEC Internal Regulat
17、ions, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the Uni
18、ted Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Description3 5Conformance4 5.1Conformance of information interchange4 5.2Conformance of devices4 5.2.1General4 5.2.2Device description4 5.2.3Originating devices4 5.2.4Receiving devices4 6Repertoire description4 6.1Rep
19、ertoire options4 6.2Graphic characters4 6.2.1Latin graphic repertoire4 6.2.2Greek letter case5 6.3Control functions5 7Coding methods5 7.1Coding methods for Latin repertoire5 7.2Coding methods for Latin and Greek repertoire5 7.3Coding methods for control characters5 7.416/32 coding environments5 8Ide
20、ntification of options5 Annexes A(normative) Extended repertoire for national or private use5 B(informative) Application to Latin and Greek character repertoires5 Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:51:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 1922 : 1997 BSI 1998
21、 1 Scope This European Standard specifies the graphic character repertoire and control functions relevant for information interchange via Telex services. It is intended to be used with and identified within other European functional standards that specify strings of coded characters for the intercha
22、nge of coded information between information processing systems (IPS) via Telex services. This standard specifies two alternative options for graphic character repertoires: option A for Latin graphic characters; and option B for Latin and Greek graphic characters. NOTE. The assignment of characters
23、to three of the code positions is outside the scope of this standard. Such assignment is subject to national or private agreement. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the
24、 appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated by amendment or revision. For undated references the latest edition of the public
25、ation referred to applies. prEN 1923European character repertoires and their coding 8-bit single-byte coding ISO/IEC 6429Information technology Control functions for coded character sets ISO/IEC 8859-1Information processing 8-bit single-byte coded graphic charactersets Part 1: Latin alphabet No. 1 I
26、SO/IEC 8859-7Information processing 8-bit single-byte coded graphic character sets Part 7: Latin/Greek alphabet ISO/IEC 10646-1Information technology - Universal multiple-octet coded character set (UCS) - Part 1: Architecture and basic multilingual plane ITU-T Recommendation S.1, 1993 International
27、Telegraph Alphabet No. 2 ELOT 1095Character set intended to be used in the Hellenic Telex and telegraphic service (in Greek) 3 Definitions For the purposes of this standard the definitions given in ISO/IEC 10646-1 and the following apply. 3.1 CC-data-element An element of interchanged information th
28、at is specified to consist of sequences of coded representations of characters, in accordance with one or more identified standards of coded character sets. 3.2 device A component of information processing equipment which can transmit, and/or can receive, coded information within CC-data-elements. (
29、It may be an input/output device in the conventional sense, or a process such as an application program or gateway function). 3.3 user A person or other entity that invokes the services provided by a device. (This entity may be a process such as an application program if the device is a code convert
30、er or a gateway function, for example). 4 Description Within the scope of this standard the processing of information interchange via Telex network equipment is as in figure 1. Information processing systems (IPS) work with character sets and coding in an ISO 8-bit environment, and these systems nee
31、d to communicate via the international Telex service, with the restriction on coding and characters this implies. This standard defines a transformation module that will transform 8-bit CC-data-elements (IPS side) in accordance with an option of prEN 1923 into 5-bit CC-data-elements in accordance wi
32、th ITU-T Recommendation S.1 (Telex side) and vice versa, while retaining as much as possible of the character repertoires functionality. This transformation module deals only with the repertoire of clause 6 of this standard, while the transformation of CC-data-elements other than those conforming to
33、 clause 6 is outside the scope of this standard. In addition, 6.2.2 specifies a Greek character repertoire, as in ELOT 1095. It follows from this, that the device to which conformance in accordance with 5.2 applies is the transformation module, and the user is the IPS. One transformation module may
34、be replaced by a sending or receiving Telex terminal. NOTE. This standard does not describe the international Telex service. In the preparation of this standard the specification of the international Telex service was assumed to be as in ITU-T Recommendation S.1 for option A, and in ITU-T Recommenda
35、tion S.1 and ELOT 1095 for option B, respectively. The use of the three code combinations in Figure Shift in the Telex code, which have been reserved for national or private use, is outside the scope of this standard. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:51:26 GMT+00:00 2006, Un
36、controlled Copy, (c) BSI Page 4 EN 1922 : 1997 BSI 1998 Figure 1. 5 Conformance 5.1 Conformance of information interchange A CC-data-element within coded information for interchange is in conformance with this standard if all the coded representations of characters within that CC-data-element confor
37、m to the requirements of clause 7 of this standard. A claim of conformance shall identify the option adopted as specified in clause 8. 5.2 Conformance of devices 5.2.1 General A device is in conformance with this standard if it conforms to the requirements of 5.2.2, and either or both of 5.2.3 and 5
38、.2.4. A claim of conformance shall identify the documents which contain the description specified in 5.2.2 and shall identify the option adopted. 5.2.2 Device description A device that conforms to this standard shall be the subject of a description that identifies the means by which the user may sup
39、ply characters to the device, or may recognize them when they are made available to him, as specified respectively in 5.2.3 and 5.2.4. 5.2.3 Originating devices An originating device shall allow its user to supply any sequence of characters conforming to the adopted option of this standard, and shal
40、l be capable of transmitting their coded representations within a CC-data-element. 5.2.4 Receiving devices A receiving device shall be capable of receiving and interpreting any coded representations of characters that are within a CC-data-element, and that conform to 5.1 of this standard, and shall
41、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. 6 Repertoire description 6.1 Repertoire options This standard specifies the following two graphic character repertoi
42、res: option A : Latin graphic character repertoire (6.2.1); or option B : Latin and Greek graphic character repertoire (6.2.1 and 6.2.2). 6.2 Graphic characters 6.2.1 Latin graphic character repertoire The Latin graphic character repertoire consists of: the character space; the 26 Latin letters A (a
43、) through to Z (z); the 10 digits zero through to nine; the following punctuation and miscellaneous characters: .full stop; ,comma; :colon; ?question mark; apostrophe; +plus sign; -hyphen-minus; /solidus; =equals sign; (left parenthesis; )right parenthesis; three unidentified characters, see note 1
44、and annex A. In this repertoire, no distinction is made between the capital and small forms of the same letter. However, a transmitting product shall allow its user to supply any letter in either its capital or its lower case form. NOTE.1. ITU-T Recommendation S.1 contains three code combinations fo
45、r which no graphic characters have been determined. The selection of these characters is left to national or regional agreement. NOTE.2. The use of extra control functions to distinguish between the capital and the small forms of the same letter is subject to national or private agreement. Licensed
46、Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:51:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 1922 : 1997 BSI 1998 6.2.2 Greek letter case The Greek graphic repertoire consists of the 24 (25) Greek letters alpha to omega, see Annex B. This repertoire makes no distinction between the ca
47、pital and lower case forms of the same letter, nor between the small Greek letter sigma and the small Greek letter terminal sigma. However, a transmitting product shall allow its user to supply any letter in either its capital or any of its lower case forms. NOTE. A special control function is provi
48、ded by the Telex service to shift between Latin and Greek graphic character repertoires, see ELOT 1095. 6.3 Control functions The repertoire of control functions shall comprise the following three control functions: line feed; carriage return; bell. NOTE. The control function WRU (Who are you?) is u
49、sed only during the establishment and confirmation of a connection, which is outside the scope of this standard. 7 Coding methods 7.1 Coding methods for Latin graphic character repertoire Information received at the 5-bit side of the transformation module, which is coded in accordance with ITU-T Recommendation S.1, shall subsequently be transformed to be coded at the information processing side (8-bit side) in accordance with the G0 set of ISO/IEC 8859-1, except that the three unidentified charact
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