1、CCITT RECMN*F*bO 92 48b259L 0574443 473 W INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEGRAPH AND MOBILE SERVICES OPERATIONS AND QUALITY OF SERVICE F.60 (08/92) OPERATIONAL PROVISIONS FOR THE INTERNATIONAL TELEX SERVICE Recommendatio
2、n F.60 Geneva, 1992 CCITT RECMN*F*bO 92 4862573 0574444 30T INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEGRAPH AND MOBILE SERVICES OPERATIONS AND QUALITY OF SERVICE F.60 (08192) OPERATIONAL PROVISIONS FOR THE INTERNATIONAL TELEX SER
3、VICE Recommendation F.60 Geneva, 1992 CCITT RECflN*F=bO 92 4862593 0574445 246 m FOREWORD The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union 0. CCIIT is responsible for studying technical, operating and tarif
4、f questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CCITT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendation
5、s by the members of CCIT between Plenary Assemblies is covered by the procedure laid down in CCIT Resolution No. 2 (Melbourne, 1988). Recommendation F.60 was revised by Study Group I and was approved under the Resolution No. 2 procedure on the 4th of August 1992. CC NOTES 1) telecommunication admini
6、stration and a recognized private operating agency. In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a 2) A list of abbreviations used in this Recommendation can be found in Annex C O ITLJ 1992 Ail rights reserved. No part of this publication may be re
7、produced 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.bO 92 4Bb2591 0574446 182 Recommendation F.60 OPERATIONAL PROVISIONS FOR THE INTERNATIONAL TELEX SERVICE (revised 1992) 1 Introd
8、uction 1.1 Scope 1.1.1 These provisions fix the rules to be followed in the international telex service. 1.1.2 The International telex service is a telegraph service for subscribers whereby they can communicate directly and temporarily between themselves using equipment operating at a modulation rat
9、e of 50 bauds and presenting a start-stop telegraph interface to the international telex network and employing International Telegraph Alphabet No, 2. 1.1.3 The general characteristics of the international telex service are described in Recommendation F.59 which provides a convenient guide to the va
10、rious Recommendations dealing with the international telex service, including the R-, S- and U-Series Recommendations which deal with matters of an essentially technical nature. 1.2 intemational telex circuits -Routes 1.2.1 International telex circuits are made up by using telegraph-type circuits. 1
11、.2.2 directly connected and shall thereby constitute the international telex network. The networks of the countries participating in the international telex service shall, as far as practicable, be 1.2.3 In case of breakdown, any defective international circuit (or section of an international circui
12、t) must be repaired with all possible speed and, pending repair, every attempt must be made to provide a replacement circuit with the minimum delay. 1.2.4 primary telex routes and, to the extent necessary and possible, upon secondary telex routes. For each relation, the Administrations concerned sha
13、ll, by mutual agreement, decide upon one or more 1.2.5 In this respect, the Administrations shall conform, as far as possible, with the principles recommended by the CCITT as regards the constitution and maintenance of circuits and installations. In particular, the provisions of Recommendation U.8 r
14、egarding end-to-end performance objectives and call set-up time should be taken into account when intemational telex routes are being established between two countries, or via a transit country. 1.2.6 dation F.95. A Table of international telex relations and traffic i is published in accordance with
15、 Recommen- 1.3 Duration of service - kgal time 1.3.1 Each Administration shall fix the working hours of its centres. 1.3.2 Automatic international telex centres are in principle continuously open. 1.3.3 Manual international telex centres should, as far as possible, afford continuous service. 1.3.4 c
16、losing hours when there are cails in progress. 1.3.5 Switching centres that are not open continuously are required to extend their service beyond the normal Each centre shail use the legai time of its country or of its zone. CCITT RECMN*F.bO 72 4862573 0574447 O39 - 2 2.1 2.1.1 2.1.2 2.2 2.2.1 Class
17、es of telex call General Accepted classes of telex cal are: a) b) c) In the manual and semi-automatic services only, the following additional classes of call are accepted: a) safety of life telex calls; b) Government telex calls. ordinary private telex calls between subscribers; service telex calls,
18、 including requests for directory information between telex centres; privilege telex calls (see Recommendation D.193). Service telex calls Service telex callsmay be exchanged free of charge between the Administrations participating in the international telex service (see Recommendations F.17 and D.1
19、92). 2.2.2 Service telex calls may be requested only by persons authorized to do so by their respective Administrations. 2.3 Government telex calls (manual and semi-automatic service only) 2.3.1 2.3.2 subscriber. The person booking a Government telex cail must state his name and rank on request. A G
20、overnment telex call shall have priority only if priority has been specifhilly requested by the calling 3 Operation of the international telex service 3.1 Operating systems 3,l. I The international telex service may operate: - automatically; - semi-automatically; or - manually. 3.1.2 in the internat
21、ional relations that concern them. Adminisuations shall reach mutual agreement upon the most appropriate method of operation to be applied 3.2 Automatic operation 3.2.1 that it be possible for subscribers to reach one another by fully automatic selection. It is strongly recommended that the telex ne
22、twork of each country be on an automatic switching basis and 3.2.2 the intemational telex network, if required, which is fixed according to national rules. To establish a connection in the automatic service the subscriber should normally select: an access code to 3.2.3 In accordance with Recommendat
23、ion U.l, through-connection is normally indicated to the calling subscriber by the return of the called subscribers answerback code. In order to facilitate the checking of this code within the delay provided by Recommendations F.6 1 and U. 1, insertion by the network of any signals between the call-
24、connected signal and the called subscribers answerback should be avoided. 2 Recommendation F.60 (Osp92) CCITT RECMN*F.bO 92 4862591 0574448 T55 Note - For future systems on international connections, it Is also desirable to avoid the addition by the called network of date, the and other signals afte
25、r the called subscribers answerback. However, service codes or other information in accordance with U-series Recommendations may be sent by the called network, for example, NCH or RDI in accordance with Recommendation U.41. 3.2.4 3.2.5 Administrations may set a limit on the maximum duration, for exa
26、mple, 12 hours or 24 hours. In the automatic service no priority shall be given to the various classes of calls listed in $2.1. The duration of calls in the automatic service should not be limited. However, for operational reasons, 3.2.6 In the automatic operation of the international telex service,
27、 if, during an established connection, there is a prolonged period of idle condition, the originating network may initiate clearing. This provision does not apply to either transit or the terminating network. Where such protection against inadvertent holding of a circuit is provided, it is recommend
28、ed that Administrations make any necessary arrangements for the facility not to operate where requested by the subscriber or for certain types of calls. 3.2.7 For any given trdfic relation between two countries, the number of circuits provided should be arranged such that, during the busy hour, the
29、probability of lost calls due to the lack of international circuits should not exceed 1 call in 50. For the calculation of the number of circuits, tbe requirements of Recommendation F.64 should be applied. 3.3 Semi-automatic and manual operation 3.3.1 General provisions 3.3.1.1 Wherever fully automa
30、tic selection has not yet been adopted, it is recommended that semi-automatic operation should be introduced, whereby the operator of the originating international telex position receives the booking, sets up and controls the call. 3.3.1.2 Where semi-automatic service is not possible, calls shall be
31、 established manually by means of two or more international telex positions in tandem whereby the operator of the originating international telex position normally receives the booking. 3.3.1.3 The operator of the originating international position must be acquainted with the necessary operating par
32、ticulars of the networks in the destination country. The incoming Administration will give all the necessary technid information to the outgoing Administration. 3.3.1.4 technical service responsible for their maintenance. 3.3.1.5 The technical services responsible for the maintenance of telex circui
33、ts are recommended to use the abbreviations given in the List of service abbreviations for maintenance of telegraph circuits, published in Annex A of Recommendation R.90. Any faults in installations noted by international telex positions must be reported without delay to the 3.3.1.6 as far as possib
34、le for a no-delay telex service. The number of circuits between two networks and the switching equipment should in all cases be calculated 3.3.2 Booking of telex calls 3.3.2.1 the country, the subscribers exchange if necessary, and his national number. 3.3.2.2 Bookings of telex calls not completed s
35、hall cease to be valid In the booking of a cail, the telex insailation of the subscriber required must be designated by the name of Where all the offices concerned are open continuously: a) at midnight if the telex call has been booked before 10 p.m. on the same day: b) at 8 am. if the telex call ha
36、s been booked after 10 p.m. the previous evening; c) in each case the times indicated shall be those of the originating telex centre. Where all the offices concerned are not open continuously: - at the closing time of the originating telex centre. Recommendation F.60 (OSD2) 3 CCITT RECMN*F.bO 92 486
37、2591 0574449 991 3.3.2.3 caller may, so long as the required subscriber has not been obtained In the case of all bookings of telex calls, and subject to the provisions relative to the validity of bookings, the a) cancel his booking; b) c) 3.3.2.4 Modifications of bookings sha be permitted free of ch
38、arge; the origin Administration may, however, make a special charge covering the additional work of recording. This charge shall not enter into the international accounts. 3.3.3 Priori0 of telex calls 3.3.3.1 classes of call. 3.3.3.2 service, either normally or temporarily, international telex calls
39、 shall be set up in the following order: specify the time after which the booking should be cancelled; change the number of the station required within the destination country. When the manual telex service normally provides a demand service, no priority shall be given to the various Under fault or
40、congestion conditions, and in general when a national telex service does not provide a demand a) calls concerning safety of life; b) service calls concerning the re-establishment of international telecommunication links following a major breakdown or disruption in service (see Recommendation A.30);
41、c) government calls for which priority has specifically been requested; d) government calls for which priority has not been requested, ordinary private calls, service caiis other than those mentioned in b); e) privilege calls. 3.3.3.3 the exchange. In the international telex centre, caiis shall take
42、 their priority according to their class and time of receipt at 3.3.4 Establishment and disconnection of calls by the international telex positions 3.3.4.1 Telex calls established manually or semi-automatically will normally be controlled by the international telex position in the origin country. Ho
43、wever, where a call is established over two or more international links and access to the second link is obtained manually in the transit country concerned, control of the cai1 will be exercised by the operator in the transit country in the following circumstances: if the fust iink is provided by la
44、ndline, satellite, microwave link or submarine cable and the second or subsequent link by ARQ radio; if the call is booked with the operator in the transit country and connection with the subscriber in the origin country is established semi-automatically. a) b) 3.3.4.2 International telex centres co
45、nnected with each other by several international telex circuits may, by mutual agreement, allocate certain of these circuits for setting up transit cas or for the establishment of traffic in one direction only. 3.3.4.3 For the operation of international telex circuits, the French or English language
46、 shall be used between Administrations having different languages, in the absence of special agreements between them for the use of other languages. 3.3.4.4 In the manual service, all bookings, modifications of bookings and cancellation advices shall be transmitted as quickly as possible to the inte
47、rnational telex centre charged with establishing the cas booked. 3.3.4.5 In the manual service, calling signals on international circuits must be answered immediately. 3.3.4.6 On bothway circuits, calls of the same class are established alternately. The international telex centres may, by mutual arr
48、angement, temporarily change to one-way working to improve the flow of traffic. 3.3.4.7 Telex calls already prepared must not be delayed for the benefit of cails of higher priority, with the exception of calls concerning safety of life. 4 Recommendation F.60 (08192, CCITT RECMN*F.bO 92 4862571 05744
49、50 603 W 3.3.4.8 Without prejudice to the provisions of 8 3.3.6, the operator directing the calls at the international telex position shall verify that transmission between the correspondents is satisfactory. He shall note the time when the call is established as well as the time when the call ends and/or its duration. He shall record service incidents and other items necessary for the preparation of the international accounts. 3.3.4.9 With the exception of the cases where the duration of calls is limited, and of cases where an infringement of the present provisions or national
