1、 STDSITU-T RECMN F-LBq-ENGL L77b Li8b257L 0b23377 33b INTERNATIONAL TELECOMMUNICATION UN ION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU F.184 (07/96) SERIES F: NON-TELEPHONE TELECOMMUNICATION SERVICES Telematic services - Public facsimile service Operational provisions for the internation
2、al public facsimile service between subscriber stations with group 4 facsimile terminals (telefax 4) ITU-T Recommendation F.184 (Previously CCITT Recommendation”) STD-ITU-T RECMN F-189-ENGL L77b m 48b257L Ob23378 272 m ITU-T F-SERIES RECOMMENDATIONS NON-TELEPHONE TELECOMMUNICATION SERVICES TELEGRAPH
3、 SERVICE Operating methods for the international public telegram service The gentex network Message switching F. 1-F. 109 F.l-F.19 F.20-F.29 F.30-F.39 The international telemessage service F.40-F.58 The intemational telex service F.59-F.89 Statistics and publications on international telegraph servi
4、ces F.90-F.99 Scheduled and leased communication services Phototelegraph service Mobile services and multidestination satellite services MOBILE SERVICE F. 100-F. 1 O4 F. 105-F. 109 F. 1 1 O-F. 1 59 F.llO-F.159 Teletex service F.200-F.299 Videotex service General provisions for telematic services MES
5、SAGE HANDLING SERVICES DIRECTORY SERVICES DOCUMENT COMMUNICATION Document communication Programming communication interfaces DATA TRANSMISSION SERVICES AUDIOVISUAL SERVICES ISDN SERVICES UNIVERSAL PERSONAL TELECOMMUNICATION HUMAN FACTORS F.300-F.349 F.350-F.399 F.400-F.499 F.500-F.549 F.550-F.599 F.
6、550-F.579 F.580-F.599 F.600-F.699 F.700-F.799 F.800-F.849 F.850-F.899 F.900-F.999 For further details, please refer to ITU-T List of Recommendations. FOREWORD The -T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (IT). The IT-T is respons
7、ible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the
8、 -T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the IT-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation F.184 was revised by ITU-T Study Group 1 (1993-
9、1996) and was approved under the WTSC Resolution No. 1 procedure on the 19th of July 1996. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1996 All rights reserved. No pa
10、rt 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 F.184 (07/96) 1 STDmITU-T RECMN F-L8LI-ENGL L97b M 48b2571 Ub23380 920 M 1 6 7 8 9 10 11 CONTEN
11、TS Introduction 1.1 scope 1.2 Service definitions 1.4 Restrictions on the use of the Telefax 4 service . Network requirements Numbering plan Coding scheme . Operation of the Telefax 4 service . 5.1 General 5.2 Call phases 5.3 Call identification . 5.4 ISDN supplementary services . Quality of service
12、 . 6.2 Error protection . 6.3 International routes . 6.4 Duration of service . 6.5 Observations on the quality of the service Subscriber terminals . 7.1 General 7.2 Coding scheme 7.5 Alarm indicators . 7.6 Terminal identification . 7.7 Page format, Telefax 4 service . Customer information 8.1 Direct
13、ories 8.2 Operating instructions . 7.4 Receiving capability . Access to facsimile message handling facilities . Tariff principles Recommendation F.184 (07/96) Page 1 1 1 2 2 2 3 3 3 4 4 5 6 6 6 6 6 6 6 7 7 7 7 8 9 9 9 9 9 SUMMARY This Recommendation defines the operational provisions for the interna
14、tional public facsimile service between subscriber stations with Group 4 facsimile machines (Telefax 4). Study Group 1 has agreed to delete the Recommendations covering the teletex service and this has required the amendment of Recommendation F.184 to remove references to teletex. Recommendation F.1
15、84 (07/96) . 111 - STD.ITU-T RECMN FaL89-ENGL 177b m 48b2571 b23382 7T3 m Recommendation F.184 OPERATIONAL PROVISIONS FOR THE INTERNATIONAL PUBLIC FACSIMILE SERVICE BETWEEN SUBSCRIBER STATIONS WITH GROUP 4 FACSIMILE TERMINALS (TELEFAX 4) (revised in 1996) 1 Introduction 1.1 Scope 1.1.1 service. This
16、 Recommendation defines the rules to be followed in the international Group 4 Facsimile (Telefax 4) 1.1.2 subscribers to exchange correspondence either manually or automatically via telecommunication networks. The telefax 4 is an international service, offered by Recognized Operating Agencies (ROAS)
17、 enabling 1.1.3 The basic element of the correspondence between people using the service is the page, as the smallest unit of text treated as an entity. No restrictions shall exist as far as the operator procedures for generation of the text or the positioning of text within the reproducible area on
18、 a page are concerned. 1.1.4 Recommendations. Questions of an essentially technical nature concerning the Telefax 4 services are dealt with by the T-Series 1.1.5 In this Recommendation, the word “terminal” is used instead of “apparatus” which appears in Recommendations T.563 and T.6. These two words
19、 should be considered as being equivalent. 1.2 Service definitions 1.2.1 General An essential characteristic of the Telefax 4 service is that it provides a basic level of compatibility between ail terminais participating in the service. 1.2.2 Basic requirements 1.2.2.1 The basic requirements of Tele
20、fax 4 service are as follows: a) the basic level of compatibility is provided between any two terminais both nationally and internationally so that they may communicate image-coded information to each other. This is to be achieved by requiring that terminals comply with Recommendations T.6, T.62, T.
21、70, T.503, T.563 and TAOO-Series; it is for each ROA to decide on the network) on which the Telefax 4 service will be carried. There shall be no restriction on the type of network to be used; b) c) d) it should be possible to extend the Telefax 4 service to any number of countries; to permit private
22、 use options, for example encryption, there shall be no technical limitation on the bit sequence of the subscribers information that may be transmitted; e) a received Telefax 4 message can be printed or displayed as decided by the recipient and the terminal characteristics. If the message is printed
23、, the receiving subscriber will be furnished with a document that is identical with that produced by the sending subscriber as far as its contents, layout and format are Concerned; it is intended that the Telefax 4 service should require no changes to the Recommendations for existing services or net
24、works. f) Recommendation F.184 (07/96) 1 1.2.3 Standardized options 1.2.3.1 It is recognized that some subscribers may need to use their Group 4 facsimile terminals to communicate nationally and internationally using service features that are not included in the basic requirements. A number of ITU-T
25、 standardized options should, therefore, be defined. However, the provision of any option in a service leads to some degree of incompatibility and the number of standardized options should be restricted to those features which are listed below for which a clear international need can be foreseen. Th
26、e sending terminal shall ensure the transmission of documents using only those options that have been indicated as being available at the receiving terminal. 1.2.3.2 The standardized options should provide means for: a) b) c) d) e) printable areas (Recommendation T.563); f) g) h) NOTES 1 2 different
27、 pel transmission densities (Recommendation T.563); optional coding schemes (Recommendations T.6, T.81 and T.82); grey scale images (Recommendations T.42, T.81, T.82 and T.85); colour images (Recommendations T.42, T.81, T.82 and T.85); escape into national and private options (Recommendation T.62);
28、resolution conversion algorithms (Recommendation T.563); file transfer - for further study. Administrations and ROAS are encouraged to ensure that standardized and nationally defined options are used in such As the service develops, there is a need for further study and consequently changes may be r
29、equired to the above list. a way as to minimize the need for the introduction of private use options. 1.4 Restrictions on the use of the Telefax 4 service NOTE - Please refer to Recommendation F. 160 for details. 2 Network requirements 2.1 It is the responsibility of each ROA to decide on which netw
30、ork(s) the Telefax 4 service is to be provided. The term Telefax 4 network, as used in this Recommendation, shall be taken to mean a network on which Telefax 4 service is provided. 2.2 Considering that the Telefax 4 service may be operated on the following networks: a) b) c) Telefax 4 service on an
31、Integrated Services Digital Network (ISDN). Telefax 4 service on a Circuit Switched Public Data Network (CSPDN). Telefax 4 service on a Packet Switched Public Data Network (PSPDN). Interworking between Group 4 facsimile terminals supported on any networks must be possible. 2.3 agreements to use othe
32、r means may be made where necessary. 2.4 networks, Recommendation X.300 shall apply. 2.5 up to 64 kbit/s. The intemational connection shall use international data transmission facilities. Exceptionally, bilateral In the case of international interworking between Group 4 facsimile terminals connected
33、 to dissimilar International routes between ISDNs for the Telefax 4 service shall be capable of supporting user data rates of 3 Numbering plan 3.1 Considering that it is the responsibility of each ROA to decide on the network(s) to be used for the Telefax 4 service in accordance with the options not
34、ed in clause 2, the Telefax 4 numbering pian must accommodate these options. 2 Recommendation F.184 (07/96) 3.2 Recommendation E.164 for ISDN, and Recommendation X. 121 for Public Data Networks (PDNs). The Telefax 4 numbering plan is based upon the individual numbering plans of each of these network
35、s, i.e. 3.3 Each of these numbering plans provides for international calls between similar networks. 3.4 existing networks. Further study is required. Administrations are requested to consider the numbering plan of their particular implementation relative to the 4 Coding scheme 4.1 The basic coding
36、scheme for the international Telefax 4 service is detailed in Recommendation T.6. 5 Operation of the Telefax 4 service 5.1 General 5.1.1 The Telefax 4 service in each country and the interconnection between countries or networks shall use fully automatic switching so that it is possible for any Tele
37、fax 4 subscriber to reach any other Telefax 4 subscriber using fully automatic selection. 5.1.2 It is a requirement to allow the through connection of a call between Group 4 facsimile terminals connected to a private automatic branch exchange (or similar systems) and those connected to public exchan
38、ges used for the Telefax 4 service. 5.1.3 One-way Communication (OWC); the calling subscriber will have full control of the Group 4 facsimile call. Two-way Alternate (TWA) communication is a capability of the Telefax 4 service, which also includes 5.1.4 Interworking with other services For further s
39、tudy 5.1.4.1 Interworking between telefax services Communication between terminals should take place at the level of compatibility at, or nearest to, the parameters initially selected by the originating user. The determination of this level should be carried out automatically via the pre- message pr
40、ocedures. This should take into account aspects of the quality of transmission media available in the participating networks and the options available on the receiving terminal. 1) Telefax 4 (ISDN) - Telefax 3 (PSnV) Interworking between terminals of the Telefax 4 service connected to the ISDN and t
41、erminals of the Telefax 3 service (see Recommendation F.180) should be provided as a function of the Group 4 terminal. Telefax 4 terminals connected to the ISDN will use specific service features of the ISDN. The capability of the Telefax 4 terminal on the ISDN shall be as follows: i) Calls from Tel
42、efax 4 (ISDN) to Telefax 3 (PSTN) should be set up using the 3.1 kHz audio bearer service if it is known that the called number is Telefax 3. Otherwise, the Telefax 4 will attempt the call using the circuit mode 64 kbit/s 8 kHz structured multi-user bearer service category (MUB - Recommendation 1.23
43、1.9) specifying the 3.1 kHz fallback option. Where a network does not support the MUB service, an alternative solution would be to attempt the Telefax 4 call initially using the 64 kbit/s bearer service and, if unsuccessful, re-attempt the call as a Telefax 3 using the 3.1 kHz, audio bearer service.
44、 This will allow the completion of calls to other ISDN terminals or PSTN Group 3 terminals. Recommendation F.184 (07/96) 3 ii) Calls from Telefax 3 (PSTN) to the ISDN terminal will be presented on the 3.1 kHz audio bearer service. The Telefax 4 (ISDN) terminai shall accept the call and operate as a
45、Group 3 terminal. NOTE -Telefax 4 (ISDN) - ISDN calls will use the 64 kbit/s bearer service. 2) Telefax 4 (PDN) - Telefax 3 (PSm) In this case, Telefax 4 terminals use data transmission facilities. Interworking shall be provided by network interworking units. As far as the numbering plans are concer
46、ned, refer to paragraphs 3.4 and 3.5. 5.1.4.2 provided in accordance with the appropriate ITU-T Recommendation. 5.1.4.3 facsimile provided over public switched networks. Interworking between Telefax 4 terminals provided on different Public Data Networks (PDNs) shall be Interworking is desirable betw
47、een terminals of the Telefax 4 service and terminals of services other than 5.2 Caii phases 5.2.1 The operation for each call may be divided into the following three phases: a) b) Transmission: Preparation: preparation of the information to be transmitted. - - - - - call clearing. NOTE 1 - During th
48、ese parts of the transmission phase the network must be transparent with respect to control procedures. Output: displaying the message either by immediate printing or from a storage medium upon control by the user. NOTE 2 -The information may consist of one or more Telefax 4 documents each consistin
49、g of one or more Telefax 4 pages. call establishment (manual or automatic); pre-information phase (see Note 1); information transfer (see Note i); post information phase (see Note 1); c) 5.2.2 to-end communication procedures between terminals in the service. 5.2.3 5.2.4 network on which the Telefax 4 service is provided (see relevant Recommendations). The control procedures as specified in Recommendations T.62, T.503 and T.400-Series shall be used as end- The network independent basic transport service for Telefax 4 is specified in Recommendation T.70. The network-dependent
