1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU MA 170 (04/97) SERIES M: TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Mobile telecommunication systems and services Maintenanc
2、e aspects of mobile digital telecommunication service via satellite TU-T Recommendation M. I 170 (Previously CCITT Recommendation) ITU-T M-SERIES RECOMMENDATIONS TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Introductio
3、n and general principles of maintenance and maintenance organization M. 10-M.299 International transmission systems M.300-M.559 International telephone circuits M.560-M.759 Common channel signalling systems M.760-M.799 International telegraph systems and phototelegraph transmission M.800-M.899 Inter
4、national leased group and supergroup links International leased circuits M. 900-M. 999 M. 1000-M. 1 O99 yste se 00-M.1 I9 International public telephone network M.1200-M.1299 International data transmission systems M.1300-M.1399 Designations and information exchange M. 1400-M. 1999 International tra
5、nsport network M.2000-M.2999 Telecommunications management network M.3000-M.3599 Integrated services digital networks M.3600-M.3999 M .4000-M .4999 Common channel signalling systems For further details, please re to ITU-T List of Recommendations. ITU-T RECOMMENDATION M.1170 MAINTENANCE ASPECTS OF MO
6、BILE DIGITAL TELECOMMUNICATION SERVICE VIA SATELLITE Summary This Recommendation describes general maintenance aspects of mobile-satellite digital systems for maritime andor land use predominantly based on INMARS AT-M and INMARS AT-B maintenance requirements. Source ITU-T Recommendation M.1170 was p
7、repared by ITU-T Study Group 4 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 19th of April 1997. Keywords INMARSAT-B, INMARSAT-M; Maintenance Aspects, Mobile Satellite Digital Systems. FOREWORD ITU (International Telecommunication Union) is the United Nations Speciali
8、zed Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the IT. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications
9、on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is
10、covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. . NOTE In this Recommendation, the expression “Administration“ is used for concisenes
11、s to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no p
12、osition concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU hadihad not received notice of intellectual prop
13、erty, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1997 All rights reserved. No part of this publication
14、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. 11 Recommendation M.1170 (04/97) STD-ITU-T RECMN M-LL70-ENGL 1997 W 48b2571 Ob374bG L2b W 1 1.1 1.2 2 3 3.1 3.2 4 5 5.1 5.2 6 6.1 6.2
15、 7 7.1 7.2 CONTENTS Page General . Scope References Available services . System configuration Space segment Earth facilities . 3.2.1 Land Earth Station (LES) . i 3.2.2 Mobile Earth Station (MES) . 3.2.3 Ship Earth Station (SES) . 3.2.4 Test terminal 3.2.5 Network Coordination Station (NCS) . General
16、 maintenance pnnciples Lining-up and maintaining circuits . Terrestrial circuits . 5.1.1 Lining-up and maintaining international public switched telephone circuits Mobile satellite digital circuits . 5.2.1 Control, sub-control and responsibilities 5.2.2 Transmission design characteristics 5.2.3 Faul
17、t reporting procedures Test facilities at mobile earth stations Automatic testing Manual testing Maintenance organization for the mobile satellite digital system Maintenance organization as applicable to the INMARSAT-BA4 system responsibility . Land Earth Station (LES) maintenance responsibility 7.1
18、.1 7.1.2 7.1.3 Network Coordination Station (NCS) maintenance responsibility . 7.1.4 Network Operations Centre (NOC) maintenance responsibility . Cooperation between the general maintenance organization (Recommendation M.7 1 O 7) and the maritime satellite maintenance organization Mobile Earth Stati
19、on (MES)/Ship Earth Station (SES) maintenance 1 4 6 6 7 . Recommendation M.1170 (04/97) 111 Recommendation M.1170 MAINTENANCE ASPECTS OF MOBILE DIGITAL TELECOMMUNICATION SERVICE VIA SATELLITE (Geneva, 199 7) 1 General 1.1 Scope The purpose of this Recommendation is to describe general maintenance pr
20、ocedures and facilities that are required for the maintenance of the mobile digital telecommunication system via satellite INMARS AT-M and INMARSAT-B, denoted as INMARSAT-M/B hereafter) and define interrelationship and interworking issues of such systems with terrestrial voice and data networks. Whe
21、rever possible, the standard maintenance procedures and facilities specified in the M- and O- Series Recommendations, and appropriate X-Series Recommendations for data should be followed for the maintenance of these systems. 1.2 References The following ITU-T Recommendations and other references con
22、tain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore encouraged to investiga
23、te the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. CCITT Recommendation M.715 (19SS), Fault reportpoint (circuit). CCITT Recommendation M.716 (1988), Fault report
24、point (network). CCITT Recommendation M. 15 1 O (1 992), Exchange of contact point information for the maintenance of international services and the international network. ITU-T Recommendation F. 127 (1 996), Operational procedures for interworking between the international telex service and the ser
25、vice offered by the INMRSAT-C system. ITU-T Recommendation X.25 (I 996), Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit. CCITT Recommendation M. 1 140 (
26、1 992), Maritime mobile telecommunication services via satellite. CCITT Recommendation M.7 1 O (1 988), General maintenance organization for the international automatic and semi-automatic telephone service. CCITT Recommendation O. 1 1 (1 992), Maintenance access lines. Available services The mobile
27、digital telecommunication system is intended for the provision of telephone, facsimile, telex and data communication services. Recommendation M. 1170 (04/97) 1 3 System configuration The INMARSAT-MA3 system consists of the following major elements per ocean region (see Figure 1): a) b) c) Land Earth
28、 Stations (LESS); d) Mobile Earth Stations (MESS); 4 Ship Earth Station (SES); the space segment including satellites; the Network Coordination Station (NCS); 3.1 Space segment The space segment comprises the satellite communications transponder(s) for each ocean region and associated frequency band
29、s assigned for use by the INMARSAT-MA3 system. The ocean regions are the Atlantic East, the Atlantic West, the Pacific and the Indian Oceans. 3.2 Earth facilities 3.2.1 Land Earth Station (LES) A land earth station in the mobile-satellite service is an earth station which interfaces with the space s
30、egment (at C-band and L-band) on the one hand and with the fixed voice and data networks on the other hand. 2 Recommendation M.1170 (04/97) STD-ITU-T RECMN M.LL70-ENGL L777 m gBb257L Ob374b7 735 I I I -ci 1 5; W a C O d c W CI v .- * 5 5 m a m CI 3 I m CI * I v) W vi v) . 2 - e O m s CI O m .- U - E
31、 Recommendation M.1170 (04/97) 3 STD-ITU-T RECMN M.117O-ENGL 1997 D 48b2591 Ob374bB 871 D 3.2.2 Mobile Earth Station (MES) A mobile earth station in the mobile-satellite service is a station which provides an interface for connection of a mobile satellite digital circuit to a mobile local system (se
32、e Figure 1). This generic definition applies to both maritime and land mobile (INMARSAT-M) terminals. 3.2.3 Ship Earth Station (SES) A ship earth station in the mobile-satellite service is a maritime station which provides an interface for connection of a mobile satellite digital circuit to a mobile
33、 local system (see Figure 1). 3.2.4 Test terminal A test terminal is a ship or mobile earth station installed at each LES and used for test purposes. In this regard, the maritime test terminal may carry out some tests, normally considered to be within the province of a sub-control station, on behalf
34、 of a mobile earth station. 3.2.5 Network Coordination Station (NCS) Each ocean region is served by an NCS which manages common space segment resources and controls access of MESS to the system. The NCS provides central control of satellite channel resources to LESs and MESs/SESs within an ocean reg
35、ion. It maintains a pool of fiequencies, assigns frequencies on demand to LESs, and supervises and monitors the use of these frequencies. In addition, it administers common data, e.g. MESEES identi lists and system parameters, and is responsible for collection of call-record information for statisti
36、cal purposes. 4 General maintenance principles In an intemational connection which includes a mobile earth station, the mobile satellite digital system may be regarded, from a transmission point of view, as analogous to a national network, and the mobile local system as analogous to a subscriber ter
37、minal within that network. Nevertheless, it should be noted that the mobile satellite digital circuit is set up between the land earth station and the mobile earth station on a demand assignment basis. Therefore, a land earth station in a mobile system may not have direct responsibility for the main
38、tenance of a particular mobile satellite digital circuit and a particular mobile earth station all of the time. The operation and maintenance of the overall INMARS AT mobile satellite digital system is the responsibility of the mobile satellite digital system operator. The maintenance organization i
39、n each participating Administration is, in general, responsible for the maintenance of the mobile satellite digital circuit usually under the guidance and coordination of the Network Operations Centre (NOC) and/or NCS. 5 Lining-up and maintaining circuits 5.1 Terrestrial circuits 5.1.1 The circuit b
40、etween the international telephone switching centre and the land earth station should be lined up and maintained in accordance with those M-Series Recommendations appropriate to international switched telephone/facsimile/data circuits and specific procedures of the INMARS AT mobile satellite system
41、operator. Lining-up and maintaining international public switched telephone circuits 4 Recommendation M.1170 (04197) 5.2 Mobile satellite digital circuits 5.2.1 Control, sub-control and responsibilities 5.2.1.1 General The assignment of control and sub-control stations and respective responsibilitie
42、s must be addressed according to the configuration of the mobile satellite digital system. A control station must be assigned to each circuit and, in addition, sub-control stations as required for efficient maintenance. 5.2.1.2 Assignment of control stations The land earth station is the control sta
43、tion for the mobile satellite digital circuit. 5.2.1.3 Assignment of sub-control stations In principle, the ship earth station or the mobile earth, station should act as the sub-control station for the mobile satellite digital circuits. However, the required staff and facilities may not always be av
44、ailable to meet the circuit sub-control responsibilities. 5.2.1.4 Control stations dealing with mobile satellite digital circuits should fulfill the responsibilities of control stations as defined in the M-Series Recommendations. The same applies to sub-control stations. Responsibilities of control
45、and sub-control station 5.2.2 Transmission design characteristics The transmission design characteristics for such satellite channels are defined by the satellite system operator for the INMARSAT-MA3 system. 5.2.3 Fault reporting procedures Fault report points (circuits) should be identified in acco
46、rdance with Recommendation M. 715 i. Fault report points (network) should be identified in accordance with Recommendation M.716 2. One such point for the INMARSAT networks is the Network Operations Centre (NOC). However, international networking problems should be referred to the fault report points
47、 (network) concerned. Exchange of contact point information should be in accordance with Recommendation M. 15 1 O 3. 6 Test facilities at mobile earth stations 6.1 Automatic testing Mobile units operated in mobile environments would not in general have personnel with adequate expertise for testing a
48、nd maintaining equipment connected to the international network. Therefore, remote automatic testing of a mobile earth station would be possible by including automatic test equipment at the land earth station and the mobile earth station. The required facilities include quiet termination test line a
49、nd loop around test line as given in Recommendation 0.1 1 SI. 6.2 Manual testing It should be possible to undertake manual testing of the transmission performance of mobile earth stations. This type of test is essential when a mobile earth station is being lined-up after it has been repaired. It should be possible to initiate the test either from the land earth station or from the mobile earth station. Recommendation M.1170 (04/97) 5 7 Maintenance organization for the mobile satellite digital system 7.1 The maintenance responsibility within a mobile satellit
