1、 STD-ITU-T RECMN M-It1bO-ENGL 1997 D 48b2591 Ob3744b LOO W INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOM M U N I CATION STANDARDIZATION SECT0 R OF ITU M.1160 (04/97) SERIES M: TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED
2、CIRCUITS Mobile telecommunication systems and services Maintenance aspects of aeronautical mobile telecommunication service via satellite ITU-T Recommendation M. I 160 (Previously CCITT Recommendation) ITU-T M-SERIES RECOMMENDATIONS TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TE
3、LEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Introduction and general principles of maintenance and maintenance organization International transmission systems International telephone circuits Common channel signalling systems International telegraph systems and phototelegraph transmi
4、ssion International leased group and supergroup links International leased circuits Mobile telecommunication systems and services International public telephone network International data transmission systems Designations and information exchange International transport network Telecommunications ma
5、nagement network Integrated services digital networks Common channel signalling systems M.10-M.299 M. 300-M. 559 M.560-M.759 M.760-M.799 M.800-M.899 M.900-M.999 M. 1000-M. I O99 M.1100-M.1199 M. 1200-M. 1299 M. 1 300-M. 1 399 M. 1400-M. 1999 M. 2 O O O-M .2 99 9 M. 3000-M. 3599 M.3600-M.3999 M. 4000
6、-M ,4999 For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION M.1160 MAINTENANCE ASPECTS OF AERONAUTICAL MOBILE TELECOMMUNICATION SERVICE VIA SATELLITE Summary This Recommendation describes special maintenance requirements for the Aeronautical Mobile- satellite Se
7、rvice. Source ITU-T Recommendation M.1160 was revised 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-Aero System; Maintenance Aspects; Satellite Aeronautical Mobile. FOREWORD ITU (International Telecommunicat
8、ion Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a
9、 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 ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recom
10、mendations by the Members of the ITU-T is 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
11、 “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RTGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intelle
12、ctual Properly Right. The ITU takes no position 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 had/had
13、not received notice of intellectual property, 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 right
14、s reserved. No part 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 M.1160 (04/97) Il 1 1.1 1.2 2 3 3.1 3.2 4 5 6 6.1 6.2 6.3 6.4 6.5 7 7.1 7.2 CO
15、NTENTS Page General . Scope References Available services . System configuration Aeronautical satellite system 3.1.1 Space segments . 3.1.2 Aircraft Earth Station (AES) . 3.1.3 Aeronautical Ground Earth Station (GES) 3.1.4 Test Terminal (TT) 3.1.5 Interconnection with the international public switch
16、ed telephone/data network . Network Channel Management System (NCMS) . General maintenance principles Lining-up and maintaining public switched telephone/data circuits Lining-up and maintaining aeronautical satellite circuits . Control. sub-control and responsibilities 6.1.1 General 6.1.2 Assignment
17、 of control stations 6.1.3 Assignment of sub-control stations . 6.1.4 Transmission characteristics . Lining-up procedures Fault reporting procedures Responsibilities of control and sub-control station . Maintenance procedures . Maintenance organization for aeronautical satellite system . Aircraft ea
18、rth station maintenance responsibility Maintenance organization as applicable to Inmarsat 7.1.1 7.1.2 7.1.3 7.1.4 Cooperation between the general maintenance organization (Recommendation M.7 1 O SI) and the aeronautical satellite maintenance organization Ground earth station maintenance responsibili
19、ty Network channel management system maintenance responsibility Network operations centre maintenance responsibility . Recommendation M.1160 (04/97) 1 1 2 4 4 4 4 5 5 5 5 7 . 111 Recommendation M.1160 MAINTENANCE ASPECTS OF AERONAUTICAL MOBILE TELECOMMUNICATION SERVICE VIA SATELLITE (1 992; revised
20、in 1997) 1 General 1.1 Scope The purpose of this Recommendation is to describe the special maintenance procedures and facilities that are required for the maintenance of the Inmarsat aeronautical mobile telecommunication system via satellite, and to define interrelationship and interworking issues o
21、f such systems with terrestrial voice and data publidprivate networks. Wherever 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.
22、2 References The following ITU-T Recommendations and other references contain 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 revisio
23、n; all users of this Recommendation are therefore encouraged to investigate 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. i 2 3 4 CCITT Recommendation M.715 (19
24、88), Fault reportpoint (circuit). CCITT Recommendation M.7 16 (1 988), Fault report 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. CCITT Recommendation M. 1 140 (1 992), Marit
25、ime mobile telecommunication services via satellite. 5 CCITT Recommendation M.7 1 O (1 988), General maintenance organization for the international automatic and semi-automatic telephone service. 6 ITU-T Recommendation F. 127 (1 996), Operational procedures for interworking between the international
26、 telex service and the service ofered by the Inmarsat-C system. ITU-T Recommendation X.25 (1996), 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. 7 2 Av
27、ailable services The aeronautical mobile telecommunication system is intended for the provision of telephone, fax and data communication services to and from aircraft. The range of possible applications for these services includes airline crew and passenger communications (public correspondence), ai
28、rline operations communications, air traffic control services and distress urgentsafety calls. Recommendation M.1160 (04/97) I 3 System configuration 3.1 Aeronautical satellite system The major elements of the aeronautical satellite system are as follows (see Figure 1): a) the space segment includin
29、g satellites (one for each ocean region); b) the Network Channel Management System (NCMS) for each satellite region; cl aeronautical Ground Earth Stations (GESs); d) Aircraft Earth Stations (AESs). 3.1.1 Space segments The space segment comprises the satellite communications transponder(s) for each
30、ocean region and associated frequency bands assigned for use by the aeronautical mobile-satellite system. The ocean regions are the Atlantic East, the Atlantic West, the Pacific and the Indian Ocean. 3.1.2 Aircraft Earth Station (AES) An aircraft earth station interfaces with the space segment (at L
31、-band) for communications with aeronautical ground earth stations, for the purpose of setting up communication with the existing airborne equipment, and with crew and passenger telephone, packet and circuit mode (Recommendation V.22) data, positioning and other avionics equipment, in accordance with
32、 the relevant technical and operational requirements. The AES may have various combinations of voice andor data channels/circuits in typical configurations that define its class and transmission capabilities. The AES interfacing to voice and data terminations can also vary from a simple telephone to
33、 complex PBX-like arrangements for voice/circuit mode data and/or a number of packet-mode (IS0 8208) DTEs individually addressable. 3.1.3 An aeronautical ground earth station interfaces with the space segment (at C-band and L-band), on the one hand, and with the fixed voice and data networks on the
34、other hand. It operates in accordance with the relevant technical and operational requirements for communications with AESs. Each GES contains access control and signalling equipment which controls access to the satellite communication system and also acts as a gateway, interfacing with the PSTN and
35、 PSPDN or private data network communication links. The GES forms the link between the ground fixed network subscribers and airborne users. Aeronautical Ground Earth Station (GES) 2 Recommendation M.1160 (04/97) iJ AES RF IF CP NCMS PBX Earth Station Satellite Aircraft Earth Station Radio Frequency
36、(equipment) Intermediate Frequency (equipment) Channel Processing (equipment) Network Channel Management System Private Branch Exchange NOTE 1 - +R dBr and -S dBr in the aeronautical ground earth station correspond to the levels +R dBm and -S dBm using a modulation signal with the level of O dBmO. N
37、OTE 2 - +R dBr and -S dBr in the aeronautical earth station correspond to the levels of +R dBm and -S dBm using a modulation signai with a levei of O dBmO. NOTE 3 - See Figure 1M.1140 4 for 4-wire test access points. NOTE 4 -Interface protocols for data are those given in Recommendations F.127 6 and
38、 X.25 7. Figure 1M.1160 - Configuration of an aeronautical GES and Aircraft Earth Station 3.1.4 Test Terminal (TT) A test terminal is an aircraft earth station, installed at an aeronautical GES, used for test purposes: it can be either a real AES or special equipment simulating all AES capabilities
39、for testing purposes. 3.1.5 Each ocean region is served by a NCMS which manages circuit mode channel resources and controls access of the AES to the system. It can be independent of the GES or Co-located at designated ground earth stations. A network channel management system interfaces via the spac
40、e segment (at C- band) with the GESs for the purpose of managing a common pool of circuit mode satellite channels for optional frequency reuse between spot beams of the same region or between different regions. Alternatively, NCMS functions may be incorporated into all GESs of a region until a full
41、NCMS becomes operational for that region. This becomes possible since in such cases a fixed pool of channels is permanently allocated to each GES. Network Channel Management System (NCMS) 3.2 Interconnection with the international public switched telephone/data network A circuit between the Internat
42、ional Switching Centre (ISC) and aeronautical GES is considered as equivalent to an international public switched telephone/data circuit. Recommendation M.1160 (04/97) 3 STD-ITU-T RECMN M-LLbO-ENGL 2997 W 4db259L Ob37454 287 X.75 links are used for interfacing with PSDN sub-networks, while X.25 link
43、s may be used for directly accessing private service providers or airline networks. 4 General maintenance principles In an international connection which includes an Inmarsat aeronautical earth station, the aeronautical satellite system may be regarded, from a transmission point of view, as a nation
44、al network. Nevertheless, it should be noted that the aeronautical satellite circuit is set up between the aeronautical ground earth station and the aircraft earth station on a demand assignment basis. Therefore, an aeronautical ground earth station in the aeronautical satellite system may not have
45、direct or full responsibility for the maintenance of a particular aeronautical satellite circuit and a particular aircraft earth station all of the time. The operation and maintenance of the overall aeronautical satellite system is the responsibility of the aeronautical satellite system operator, e.
46、g. Inmarsat. The maintenance organization in each participating Administration is, in general, responsible for the maintenance of the aeronautical satellite circuit usually under the guidance and coordination of the Inrnarsat Network Operations Center (N0C)l andor Network Channel Management System (
47、NCMS). 5 The circuit between the International Switching Centre (ISC) and the aeronautical ground earth station should be lined up and maintained in accordance with those M-Series Recommendations appropriate to international public switched telephone/data circuits. Lining-up and maintaining public s
48、witched telephone/data circuits 6 Lining-up and maintaining aeronautical satellite circuits 6.1 Control, sub-control and responsibilities 6.1.1 General The assignment of control and sub-control stations and respective responsibilities must address the configuration of the aeronautical satellite syst
49、em. A control station must be assigned as regards circuits, and, in addition, sub-control stations as required for efficient maintenance. 6.1.2 Assignment of control stations The aeronautical ground earth station is the control station for the aeronautical satellite circuit. 6.1.3 Assignment of sub-control stations In principle, the aircraft earth station should act as the sub-control station for the aeronautical satellite circuit. However, the required staff and facilities may not be available on an aircraft to meet the circuit sub-control responsibilities. 6.
