1、CCITT RECMN*F*LSO 91 4862593 0563230 B INTERNAT ONAL TELECOMMUNICATION UN CCITT ON F.150 THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEGRAPH AND MOBILE SERVICES OPERATIONS AND QUALITY OF SERVICE SERVICE AND OPERATIONAL PROVISIONS FOR THE INTEX SERVICE Recommendation F.150 Gene
2、va, 1991 CCITT RECMN*F.350 93 4862593 0563233 T INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMM IlTEE TELEGRAPH AND MOBILE SERVICES OPERATIONS AND QUALITY OF SERVICE F.150 SERVICE AND OPERATIONAL PROVISIONS FOR THE INTEX SERVICE Recommendation
3、F.150 Geneva, 1991 - . CCITT RECMN*F.LSO 93 4862593 0563232 3 FOREWORD The CCIIT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union o. CC is responsible for studying technical, operating and tariff questions and issuin
4、g Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CCJTT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CC
5、IT between Plenary Assemblies is covered by the procedure laid down in CCIT Resolution No. 2 (Melbourne, 1988). Recommendation F.150 was prepared by Study Group I and was approved under the Resolution No. 2 procedure on the 11th of October 1991. CCITT NOTES 1) In this Recommendation, the expression
6、“Administration” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. 2) A list of abbreviations used in this Recommendation can be found in Annex A. O IT 1991 Ail rights reserved. No part of this publication may be reproduced or util
7、ized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. CCITT RECNN*F.L50 91 = 4862571 05bL233 3 = Recommendation F.150 SERVICE AND OPERATIONAL PROVISIONS FOR THE INTEXl) SERVICE 1 Introduction 1.1 With the continu
8、ing development of the infrastructures of the networks which currenly support, amongst others, the international telex service, it is feasible that some of these networks could support other services operating at speeds in excess of 50 bauds and using character sets other than those of International
9、 Telegraph Alphabet No. 2 (ITAS). There may be benefits to both customer and Administrations if a new text service could be introduced that would utilize the same network infrastructure as the international telex service, 2 Scope 2.1 service, initially operating asynchronously at 300 bids and using
10、International Alphabet No. 5 (IAS). This Recommendation sets out the service and operational principles for the introduction of a new text 3 Service outline 3.1 rate of 300 bids. The use of other transmission rates at a future date is for further study. 3.2 transparent mode (see 0 4.8). 3.3 3.4 with
11、 that used for the international telex service. This service wili be real-time circuit switched and provide asynchronous operation with a basic transmission The service will be haif-duplex in its normal mode (see 8 4.5) but will allow for full duplex operation in the The Intex service will use the d
12、estination codes detailed in Recommendation F.69. It is recommended that the national numbering scheme for the Intex service be similar to and compatible 4 Service description 4.1 Call set up procedures should be in accordance with the relevant Recommendations. 4.2 To allow maximum flexibility of us
13、e of the service and to ensure the compatibility of terminals interworking at the higher speed, four separate operating modes may be provided. These are normal mode, telex interworking mode, extended mode and transparent mode. As a minimum, normal and telex interworking mode should be provided, with
14、 the choice of operating in three modes, other than telex interworking, being a customer option on a call-by-call basis, or within a call. 4.3 4.4 the relevant CCIT Recommendation. At the beginning of any incoming or outgoing call an Intex terminal shaii always default to the normal mode. Character
15、sets, structure and procedures for generating mode changes should generally be in accordance with The use of the name Intex is conditional on its being freely available in Member countries and hence the name of the service offered may vary from country to country. Recommendation F.150 1 CCITT RECMN*
16、F-LSO 73 4862571 0563234 5 4.5 Nom1 mode Nod mode is the mode of the basic Intex call for the exchange of text. There is no need for any prearrangement or pre-knowledge with regard to the capabilities of the called terminal over and above that of normal mode functions. The character set in this mode
17、 shall be derived from the International Alphabet No. 5 in accordance with Recommendation S.34. 4.6 Telex interworking mode Telex interworking mode is intended for interworking with the international telex service (see 5 7). This mode may be invoked at the start of a call where it is known that the
18、called party is a terminal participating in the intemational telex service or it will be entered into automatically where the call is found to terminate on such a terminal and the service identifier TLX will be indicated at the Intex terminal. When the call is established in manual mode, the Intex o
19、perator should be informed if a previously-prepared message contains non-ITA2 characters. The procedures to be applied for automatic call Set-up in the case where the Intex operator is not aware of the characteristics of the called party terminal are for further study. 4.7 Entended mode Extended mod
20、e allows for the exchange of messages using the full character set of International Alphabet No. 5 in accordance with Recommendation T.50. This mode shall only be used when it has been established that it is supported by both terminals. 4.8 Transparent mode In the transparent mode the character set
21、to be used is defined by the customers involved in the call, subject only to the restriction on character structure within the network used. This mode shall only be used when it has been established that it is supported by both terminals. 5 Answerback composition 5.1 The Intex service shall employ t
22、he principle of the exchange of answerbacks, resident in the terminals and under the control of the service provider. The composition of the answerbacks for the Intex service must facilitate interworking, especially with the international telex service where many terminals employ answerback checking
23、 mechanisms based on format and length as well as content. 5.2 Intex answerbacks shall include: a) the customers national number; b) c) the terminai identity letter or letters (if required); an abbreviated namedesignating the customer; d) the identification code, equivalent to the telex network iden
24、tification code (TNIC) as specified in Recommendation F.69, preceded by a space character. 5.3 Recommendation S.35, as follows: The Intex answerback shall comprise a sequence of 20 IA5 characters, formatted in accordance with a) for terminals without identification letters: - character US (unit sepa
25、rator); - carriagereturn; 2 Recommendation F.150 CCITT RECMN*F*35O 71 48b2591 O563235 7 - line feed; - - character RS (record separator); - space; - - space; - - characterRS; for terminals with identification letters: - character US; - carriagereturn; - linefeed; numeic characters representing the n
26、ational number of the customer; alpha characters indicating the name of the customer; one or two characters representing the network identification code; b) - - character RS; - - space; - - space; - - character RS; for terminals without identification letters and whose answerback code does not inclu
27、de letters indicating the name of the customer: numeric characters representing the national number of the customer; one or two alpha characters identifying the terminal, alpha characters indicating the name of the customer; one or two characters representing the network identification code; c) - ch
28、aracter US; - carriagereturn; - line feed; - - character RS; numeric characters representing the national number of the customer; - space; - - characterRS; one or two characters representing the network identification code; d) for terminals with identification letters and whose answerback code does
29、not include letters indicating the name of the customer: - character US; - carriagereturn; - linefeed; - - character RS; - - space; numeric characters representing the national number of the customer; one or two alpha characters identifying the terminal; 3 Recommendation F.150 CCITT RECMN*F.LSO 91 4
30、862573 0563236 9 m - one or two characters representing the network identification code; - characterRS; for terminals providing mailbox or similar store and retrieval facilities: - character US; - carriagereturn; - line feed; - - = (“equals” sign); - character RS; - - space; - - character RS. e) num
31、efic characters representing the national number of the customer; two alpha characters identifying the mailbox; one or two characters representing the network identification code; If the signals in the answerback code do not fill all the 20 places available, the unused places shall be filled The alp
32、ha fields of Intex answerbacks shall comprise either upper- or lower case latin letters, but not mixed. Intex answerbacks, when subjected to the code conversion rules applied by networks, should result in by the necessary number of characters RS inserted before the network identification code. 5.4 5
33、.5 answerback formats compatible with the requirements of the service with which Intex is interworking. 6 Operations 6.1 6.2 CCIT Recommendations. International interconnection of Intex services should be agreed bilaterally. Intemational signalling and information transfer procedures should be in ac
34、cordance with the relevant 7 7.1 IA5 ITA2 RS TNIC us 4 Interworking with the international telex service Interworking with the international telex service should be in accordance with Recommendation F.82. ANNEX A (to Recommendation F.150) Alphabetical list of abbreviations used in this Recommendation International Alphabet No. 5 International Telegraph Alphabet No. 2 Record separator Telex network identification code Unit separator Recommendation F.150
