1、INTER IATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEGRAPH AND MOBILE SERVICES OPERATIONS AND QUALITY OF SERVICE F.74 (08/92) INTERMEDIATE STORAGE DEVICES ACCESSED FROM THE INTERNATIONAL TELEX SERVICE USING SINGLE STAGE SELECTION - ANSWERB
2、ACK FORMAT Recommendation F.74 Geneva, 1992 CCITT RECNN8F.74 92 W 4862591 0573791 T81 m L INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEGRAPH AND MOBILE SERVICES OPERATIONS AND QUALITY OF SERVICE F.74 (08/92) INTERMEDIATE STORAGE DEV
3、ICES ACCESSED FROM THE INTERNATIONAL TELEX SERVICE USING SINGLE STAGE SELECTION - ANSWERBACK FORMAT Recommendation F.74 Geneva, 1992 - - -_ CCITT RECMN*F.74 92 m 4862591 0573792 918 m FOREWORD The CCIIT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the In
4、ternational Telecommunication Union 0. CCIIT is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CCIIT which meets every four years, establishes the top
5、ics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CCIT between Plenary Assemblies is covered by the procedure laid down in CCIlT Resolution No. 2 (Melbourne, 1988). Recommendation F.74 was revised by Study Group I and was appro
6、ved under the Resolution No. 2 procedure on the 4th of August 1992. CCIT NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. O ITU 1992 Ail rights reserved. No part of this
7、 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. CCITT RECMN*F.74 92 4862593 0573793 854 I 4 Call establishment to an intermediate storage device I 4.1 procedures, that
8、is: Incoming calls to an intermediate storage device shall be handled in accordance with normal telex i) return of call connect in accordance with U-Series Recommendations; 3) return of answerback formatted in accordance with Figure W.74 in response to a received WRU signal; iii) return of a clear c
9、onfirmation signal in response to a received clear. Recommendation F.74 I INTERMEDIATE STORAGE DEVICES ACCESSED FROM THE INTERNATIONAL TELEX SERVICE USING SINGLE STAGE SELECTION - ANSWERBACK FORMAT (revised 1992) 1 Introduction 1.1 from the international telex service, with the ability to receive te
10、lex messages. There is an increasing trend for mailbox and other intermediate storage devices to be connected accessed 1.2 customers of the international telex service to communicate with them using normal telex procedures. Such devices are allocated network addresses that are part of the telex numb
11、ering plan thereby allowing 1.3 by the intended recipient. 1.4 The sender of the message (i.e. a telex customer) may be unaware that the addressee is a storage device, and will assume that, providing the answerback is present and correct at both start and end of the local record, the recipient will
12、receive the message without any positive action on his part. The message could remain in the storage device for some time awaiting forward transmission to or retrieval 1.5 network, and to react promptly to ensure that ineffective usage of the international telex network is minimized. Such storage de
13、vices should be required to accept ali calls delivered correctly by the international telex 2 Deftnitions 2.1 intermediate storage device An intermediate storage device is defined as any device which provides the storage of messages originating in the international telex service prior to onward tran
14、smission to or retrieval by the intended recipient. 3 Scope 3.1 The provisions of this Recommendation apply to intermediate storage devices connected to a national telex network identified by individual telex addresses which are part of the national telex numbering plan. This Recommendation recogniz
15、es that currently implemented intermediate storage devices may not conform to these provisions. However, there would be advantages if existing equipment complied with the requirements of this Recommendation where possible, but that in any case new equipment should comply in order to maintain the qua
16、lity of the international telex service. 3.2 described in the F.80- and U.200-Series Recommendations. The provisions of this Recommendation have particular application within the interworking scenarios Recommendation F.74 (08/92) . 1 - _- 5 Format of answerbacks for intermediate storage devices 5.1
17、The answerbacks of intermediate storage devices shall be formatted in accordance with the rules given in Recommendation F.60; by in addition, shall contain combination 22 in figures (= sign) separating the alpha and figure parts of the answerback. The use of “=“ in this way should be confined to the
18、 unique purpose of identifying such intermediate storage devices. - Figure-shift or (if required by the network) letter-shift - Carriage-return - Line-feed - National telex number of the intermediate storage device or (if letter-shift is fitted in the first position) figure-shift - - Letter-shift -
19、Space (optional) - Letters indicating as explicitly as possible the name of the individual customer - Space - One or two letters of the telex network identification code listed in Recommendation F.69 - Letter shift (if required by the network) followed by the national telex number of the intermediat
20、e storage device Combination No. 22 (see Notes 1 and 2) Note 1 - It should be noted that some Administrations participating in the internationai telex service use combination 22 in the figure case (=) as the initiai printing character of the answerback to indicate a bilingual terminai in its default
21、 Latin mode. Note 2 - In networks which have in use answerback codes which are arranged in an order other than the preferred in Recommendation F.60, 0 3.4.3, combination 22 in the figure case (=) (identifying an intermediate storage device) should be inserted immediately following the customers number. FIGURE W.74 Answerback format 2 Recommendation F.74 (08/92)
