1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU TELEGRAPHY ALPHABETICAL TELEGRAPH TERMINAL EQUIPMENT s.35 (03/93) ANSWERBACK CODING FOR THE INTEX SERVICE ITU-T Recommendation S.35 (Previously “CCITT Recommendation”) ITU-T RECMNJtS.35 93 4862591 0586386 8T9
2、 FOREWORD The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecom- munication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications
3、on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. ITU-T Recommendation S.35 was prepared by the ITU-T Study Group
4、 IX (1988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). NOTES 1 As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased to exist as of 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (ITU-T) was
5、 created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication Sector. In order not to delay publication of this Recommendation, no change has been made in the text to references containing the acronyms “CCITT, CCIR or IFRB” or thei
6、r associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new IT structure. 2 telecommunication administration and a recognized operating agency. In this Recommendation, the expression “Administration”
7、is used for conciseness to indicate both a O ITU 1994 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. Recommendation S.35 ANSWERBACK
8、 CODING FOR THE INTEX SERVICE (Helsinki, 1993) The KITT, considering (a) that new networks are being introduced based upon stored program control techniques; (b) that these networks as well as being able to carry the International Telex Service, can also carry the Intex service using alphabets other
9、 than International Telegraph Alphabet No. 2 and that interworking between these services is essential; (c) that the Intex service requires the establishment of new types of signalling, and that these signalling types shall permit interworking between Intex terminals, between telex terminals and Int
10、ex terminals and between telex terminals and terminals capable of operating both telex and Intex dual service terminals; (dl (e) Service and the Intex service; that Recommendation S.33 defines the alphabet and presentation characteristics for the Intex service; that Recommendation U.210 defines the
11、network interworking requirements between the International Telex (f) Telex Service; that Recommendation S.34 describes Intex terminal requirements to effect interworking with the International ts) (h) Intex service and the International Telex Service; that Recommendation F.150 defines the operation
12、al and service requirements of the Intex service; that Recommendation F.82 defines the operational and service requirements for interworking between the (i) well as content then the composition of answerbacks for Intex service must facilitate interworking; (i) International Telex Service; provisions
13、 of this Recommendation should be applied to such services. that since many telex terminals employ answerback checking mechanisms based upon format and length as that Recommendations F.60 and S.6 describe the answerback requirements for terminals connected to the NOTE - The development in the future
14、 of services similar to Intex may occur. It may be possible that some of the unanimously declares the view that 1 the answerback code for Intex customers equipment shall include: a) b) c) d) 2 If a Intex customer has more than one line arranged in a group and the network automatically hunts over the
15、se lines then the answerback code of each terminal of the group shall, apart from the terminal identification letter(s), be identical. the customers national number; followed by terminal identity letter or letters (if required); followed by (optionally) an abbreviated name designating the customer;
16、the telex network identification code preceded by a space. 3 The Intex terminal answerback shall comprise a sequence of 20 IA5 characters as follows: a) for terminals without identification letters: - character 1/15; - character O13 (carriage return); - character 040 (line feed); Recommendation S.35
17、 (03/93) I ITU-T RECMN*S-35 93 = 4862571 058bL88 671 2 - - character 1/14; - character U0 (space); - - character U0 (space); - - character 1/14, b) for terminals with identijication letters: - character 1/15; - character 0/13 (carriage return); - character 0110 (line feed); - - character 1/14; - - c
18、haracter 2/0 (space); - - character 2/0 (space); - - character 1/14, for terminals without identification letters and whose answerback code does not include letters indicating the name of the customer: - character 1/15; - character 0/13 (carriage return); - character 040 (line feed); - - character 1
19、/14; - character 2/0 (space); - - character 1/14, d) for terminals with identcation letters and whose answerback code does not include letters indicating the me of the customer: - character 1/15; - character 0/13 (carriage return); - character 0/10 (line feed); - - character 1/14; - - character 2/0
20、(space); - - character 1/14, numeric characters representing the national number of the customer; alpha characters indicating the name of the customer; one or two alpha characters representing the telex network identification code; numeric characters representing the national number of the customer;
21、 one or two alpha characters identifying the terminal; alpha characters indicating the name of the customer; one or two alpha characters representing the telex network identification code; c) numeric characters representing the national number of the customer; one or two alpha characters representin
22、g the telex network identification code; numeric characters representing the national number of the customer; one or two alpha characters identifying the terminal; one or two alpha characters representing the telex network identification code; Recommendation 5.35 (03/93) e) for terminals providing m
23、ailbox or similar store and retrieval facilities: - character 1/15; - character 0113 (carriage return); - character 0/10 (line feed); - - character 3/13; numeric characters representing the national number of the customer; - character 1/14: - - character 210 (space); - - character 1/14. two alpha ch
24、aracters identifying the mailbox; one or two alpha characters representing the telex network identification code; 4 the necessary number of characters 1/14 inserted before the telex network identification code. If the signals in the answerback code do not fill all the 20 places available, the unused
25、 places shall be filled by 5 The alpha fields of Intex terminal answerbacks shall comprise characters representing only single case letters. 6 These answerback formats, when subjected to the code conversion rules applied by networks (see Recommendation U.210). will result in answerback formats ident
26、ical with those used by telex terminals (see Recommendation F.60). Thus, no change in answerback checking algorithm need be adopted by telex terminals in order to converse with Intex terminals. Similarly, a telex answerback, when subjected to code conversion by networks will appear in the format shown above. Intex terminals will not therefore need to adopt different checking algorithms for answerbacks received from such terminals. Recommendation S.35 (03/93) 3
