1、ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU M.1150 (04197) SERIES M: TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Mobile telecommunication systems and services Maintenance aspects of maritime/land mobile tele
2、comm u n kat ion store-and-forward services (packet mode) via satellite ITU-T Recommendation M. I 150 (Previously CCITT Recommendation) ITU-T M-SERIES RECOMMENDATIONS TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Introd
3、uction and general principles of maintenance and maintenance organization International transmission systems International telephone circuits Common channel signalling systems International telegraph systems and phototelegraph transmission International leased group and supergroup links Internationa
4、l leased circuits Mobile telecommunication systems and services International public telephone network International data transmission systems Designations and information exchange International transport network Telecommunications management network Integrated services digital networks Common chann
5、el 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. 1 O99 M.11 OO-M. 11 99 M.1200-M.1299 M.1300-M.1399 M. 1400-M. I 999 M. 2 O OO-M .2 999 M.3000-M.3599 M.3600-M.3999 M.4000-M.4999 For further details, please refer to ITU-T List of Recommendatio
6、ns STD.ITU-T RECMN M.LL5O-ENGL 1797 4b259L Ilb3743b 2bL ITU-T RECOMMENDATION M.1150 MAINTENANCE ASPECTS OF MARITIME/LAND MOBILE TELECOMMUNICATION STORE-AND-FORWARD SERVICES (PACKET MODE) VIA SATELLITE Summary This Recommendation describes special maintenance procedures for maritime and land mobile-
7、satellite messaging systems predominantly based on Inmarsat-C maintenance requirements. Source ITU-T Recommendation M.1150 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-C, Maintenance Aspects, Sa
8、tellite Maritime and Land Mobile Messaging Systems. - STD-ITU-T RECMN M.LL5U-ENGL I777 4Ab257I Ob37437 ITA FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITLJ Telecommunication Standardization Sector (ITU-T) is a
9、permanent organ of the ITU. The ITU-T 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 World Telecommunication Standardization Conference (WTSC), which meets every four
10、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 covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which f
11、all 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 conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY
12、 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 position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether as
13、serted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had/had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are
14、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 may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying an
15、d microfilm, without permission in writing from the ITU. 11 Recommendation M.1150 (04/97) 1 1.2 2 3 3.1 3.2 3.3 3.4 3.5 4 4.1 CONTENTS Page General . References Available services . System configuration Space segment Earth facilities . 3.2.1 Land Earth Station (LES) 3.2.2 Ship or land mobile earth s
16、tation (SES) 3.2.3 Network Coordinating Station (NCS) . General maintenance principles 3.3.1 Responsibilities . 3.3.2 Available services . Lining-up and maintaining international public switched telex and data circuits Lining-up and maintaining satellite circuits . 3.5.1 Control. sub-control station
17、s and respective responsibilities 3.5.2 Transmission characteristics . Maintenance organization for the Inmarsat-C maritime satellite . Maintenance organization as applicable to Inmarsat 4.1.1 Ship Earth Station (SES) maintenance responsibility . 4.1.2 Land Earth station (LES) maintenance responsibi
18、lity . 4.1.3 Network Coordination Station (NCS) maintenance responsibility . 4.1.4 Network Operations Centre FOC) maintenance responsibility . Recommendation M.1150 (04/97) 1 2 2 2 2 2 3 3 4 5 iii STDsITU-T RECMN M-ZL50-ENGL 1777 W LiAb257L Ob37439 T70 Recommendation M.1150 MAINTENANCE ASPECTS OF MA
19、RITIMELAND MOBILE TELECOMMUNICATION STORE-AND-FORWARD SERVICES (PACKET MODE) VIA SATELLITE (I 992; revised in 1997) 1 General The purpose of this Recommendation is to describe the special maintenance procedures and facilities that are required for the maintenance of a maritime and land mobile packet
20、 mode telecommunication systems via satellite (Inmarsat-C). Wherever possible, since telex and data services are involved, the standard maintenance procedures and facilities specified in the F- and X-Series Recommendations should be followed for the maintenance of these systems. 1.2 References The f
21、ollowing ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute revisions of this Recommendation. At the time of publication, the editions indicated are valid. All Recommendations and other references are subject to revision; all users of this
22、 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. ITU-T Recommendation F. 127 (1 996), Operational procedure
23、s for interworking between the international telex service and the service offered by Inmarsat-C system. ITU-T Recommendation U. 1 (1 993), Signalling conditions to be applied in the international telex service. ITU-T Recommendation U.80 (1 993), International telex store and forward access ?om a te
24、lex subscriber. ITU-T Recommendation X.25 (1 996), Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (LICE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit. CCITT Recommendation M.7 10 (1 988), General mainten
25、ance organization for the international automatic and semi-automatic telephone service. CCITT Recommendation M.715 (1988), Fault report point (circuit). CCITT Recommendation M.7 16 (1 988), Fault report point (network). CCITT Recommendation M.720 (1 988), Network analysispoint. CCITT Recommendation
26、M.72 1 (1 988), System availability information point. CCITT Recommendation M.725 (1 988), Restoration control point. CCITT Recommendation M.7 17 (1 988), Testingpoint (transmission). CCITT Recommendation M.718 (1 988), Testingpoint (line signalling). CCITT Recommendation M.719 (1 988), Testing poin
27、t (switching and interregister signallina). CCITT Recommendation M.723 (1 988), Circuit control station. 1 Recommendation M.1150 (04/97) STD-ITU-T RECMN M-115O-ENGL 1997 W 48b257L b37440 792 m 2 Available services This system is intended for the provision of store-and-forward telex, fax and electron
28、ic messaging services between corresponding telex and data terrestrial networks and ships, small aircraft and land vehicles or off-shore platforms. The range of possible applications for these services includes distress reporting, polling and data reportins, X.400 electronic mail, ED1 (Electronic Da
29、ta Interchange), etc. 3 System configuration The Inmarsat-C system consists of the following major elements per ocean region (see Figure 1): a b) c) land earth stations (LES); d) the space segment including satellites and Network Operation Centre (NOC); the network coordination station (NCS); ship o
30、r land mobile earth stations (SES). 3.1 Space segment The space segment comprises the satellite communication transponder(s) for each ocean region and associated frequency bands assigned for use by the Inmarsat-C System. The ocean regions are: the Atlantic East, the Atlantic West, the Pacific and th
31、e Indian Oceans. 3.2 Earth facilities 3.2.1 Land Earth Station (LES) When providing multiple mobile services, an LES serves as a gateway to and from the terrestrial telex and data networks to SESs within the coverage area of the satellite. It interfaces with the space segment (at L-band and C-band)
32、on the one hand and with the fixed terrestrial networks on the other. 2 Recommendation M.1150 (0497) Land Earth Station (LES) Ship Earth Station (SES) - -_-_- 7 _-_- -_ , (Note 3) -7-f I r I cs +R dBr mote 1) Inmarsat-C 1- C-band equip ommuni cati o link F F p (Note2) It c SES (Note 4) L-band J equi
33、p I Inmarsat-l 1 - S dBr L- RF Radio Frequency (equipment) IF Intermediate Frequency (equipment) CP Channel Processing (equipment) NCS Network Coordination Station Earth station I I l I I , TO406580-96 Satellite NOTE 1 - +R dBr and -S dBr in the land earth station correspond to the levels +R dBm and
34、 -S dBm using a modulation signal with the level of O dBmO. NOTE 2 - See Figure UM.1140 for 4-wire test acess points. NOTE 3 -Each ocean region and each Inmarsat-C requires an NCS. An LES may be configured for one or more NCS. NOTE 4 - Interface protocols for data are those given in Recommendations
35、F. 127 11, U.1 2, U.80 3 and X.25 4. Figure 1M.1150 - Configuration of an Inmarsat-C LES and SES system 3.2.2 An SES consists of the shipboard or mobile Data Terminal Equipment (DTE) and a Data Circuit Terminating Equipment (DCE) which acts as an interface to the satellite network (space segment). T
36、he DTE is the equipment at which a communication path begins or ends; it is usually a personal computer. The DCE is used at either end of a data circuit to provide the functions necessary to establish, maintain and terminate a connection. The DCE also carries out all signal conversion and coding bet
37、ween the DTE and the satellite link. Ship or land mobile earth station (SES) 3.2.3 Network Coordinating Station (NCS) Each ocean region is served by an NCS which manages common space segment resources and controls the access of SESs to the system. The NCS provides central control of satellite channe
38、l resources to LESs and SESs within an ocean region. It maintains a pool of frequencies, assigns frequencies on demand to LESs and supervises and monitors the use of these frequencies. In addition, NCS administers common data, e.g. SES ship lists and system parameters and is capable of call-record i
39、nformation collection for statistical purpose. 3.3 General maintenance principles 3.3.1 Responsibilities In an international connection, which includes a ship or land mobile earth station, the Inmarsat-C satellite system may be regarded, from a transmission point of view, as analogous to a national
40、network and the mobile terminal or local system as analogous to a subscriber terminal within that network. Nevertheless, it should be noted that the satellite circuit is usually set up between the coast earth station and the ship earth station or mobile on a demand assignment basis. Therefore, a lan
41、d Recommendation M.1150 (04/97) 3 earth station may not have direct or full responsibility for the maintenance of a particular Inmarsat-C satellite circuit and a particular mobile earth station all of the time. The operation and maintenance of the overall mobile satellite system is the responsibilit
42、y of the mobile satellite system operator, e.g. Inmarsat. The maintenance organization in each participating Administration is, in general, responsible for the maintenance of the mobile satellite circuits in accordance with the M.700-Series Recommendations 5-i43 as related to the operation and maint
43、enance of their own Land Earth Station (LES) and its interface to terrestrial telex, data and messaging networks. 3.3.2 Available services The Inmarsat-C satellite systems in service provide telex and fax services to maritime and land maritime mobile units in addition to general messaging and data s
44、ervices. When instituting maintenance procedures, Administrations should consider the utilization of these services for communication, diagnostic and maintenance purposes, and should also ensure that trained technical staff are generally available at the ship earth station at the time the ship or la
45、nd mobile earth station is commissioned; however, under normal operating conditions, the mobile earth station is usually operated by a qualified person, who may only be able to assist in carrying out simple test procedures. Such test procedures include commissioning and performance verification test
46、s (PVT), the latter being an automatic method of testing space segment accessing parameters. 3.3.2.1 Commissioning testing Commissioning testing consists of a series of performance checks on a newly installed SES. These tests are designed to ensure that the SES complies with the technical requiremen
47、ts. Notification of a successful commissioning test is forwarded to all ocean regions via NCS to NCS to LES links. The commissioning tests are performed automatically by the Inmarsat-C system operator (Inmarsat) in conjunction with LES operators and manufacturers agents once the request for commissi
48、oning testing has been initiated by the SES operator. 3.3.2.2 Performance Verification Tests (PVTs) The performance verification test is a fully automatic test to check individual SESs with respect to signal level and some access and control sequences. The NCS maintains a record of all PVT results c
49、onducted in its ocean region and can initiate such tests if requested by a LES or by the Network Coordinating Station (NCS). 3.4 Lining-up and maintaining international public switched telex and data circuits The circuit between the international telex and data switching centre and the LES should be lined-up and maintained in accordance with those M-Series Recommendations appropriate to international public switched telexdata circuits. 3.5 Lining-up and maintaining satellite circuits 3.5.1 Control, sub-control stations and respec
