1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU L.29 (O 1 /2002) SERIES L: CONSTRUCTION, INSTALLATION AND PROTECTION OF CABLES AND OTHER ELEMENTS OF OUTSIDE PLANT As-laid report and maintenance/repair log for ma ri n ized terres t ri a I cab I e i ns ta I
2、la t io n ITU-T Recommendation L.29 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU L.29 (O 1 /2002) SERIES L: CONSTRUCTION, INSTALLATION AND PROTECTION OF CABLES AND OTHER ELEMENTS OF OUTSIDE PLANT As-laid report and maintenancehepair log for marinized te
3、rrestrial cable installation ITU-T Recommendation L.29 ITU-T Recommendation L.29 As-laid report and rnaintenanceh-epair log for marinized terrestrial cable installation Summary This Recommendation describes the documentatiodinformation that Companies, involved in the installation, maintenancehepair
4、of Marinized Terrestrial Cables, should provide to the Purchasers. Source ITU-T Recommendation L.29 was prepared by ITU-T Study Group 6 (2001-2004) and approved under the WTSA Resolution 1 procedure on 13 January 2002. ITU-T Rec. L.29 (01/2002) 1 FOREWORD The International Telecommunication Union (I
5、T) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standar
6、dizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is cove
7、red by the procedure laid down in WTSA Resolution 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 conciseness to indic
8、ate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning
9、 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, ITU had not received notice of intellectual property, protected by patents
10、 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 2002 All rights reserved. No part of this publication may be reproduced, by any
11、means whatsoever, without the prior written permission of ITU. 11 ITU-T Rec. L.29 (OU2002) CONTENTS Page 1 Introduction . 1 2 References . 1 3 As-Laid Report . 1 4 MaintenanceRepair Log 2 . ITU-T Rec. L.29 (01/2002) 111 ITU-T Recommendation L.29 As-laid report and maintenancekepair log for marinized
12、 terrestrial cable installation 1 Introduction A marinized terrestrial cable is an underwater optical fibre cable construction, based on a conventional multi-fibre terrestrial cable core protected to withstand the marine environment, designed for unrepeated applications, that is, without underwater
13、line amplifiers, hence without the need to carry electrical power and tested for use in non-aggressive shallow waters, with a varying repair capability. The difference with respect to a repeaterless submarine cable can be found in the definition given, for such a cable, in ITU-T Rec. G.972. In proxi
14、mity of the landing points there are often many cables coming from various routes. In the shore-end portions, the cables and related protections such as burials, articulated steel pipes, etc. are closer and closer. Moreover, often the actual route is quite different from that foreseen as the laying
15、reference route, as designed according to the various surveys, and the related documents are not updated. This situation could negatively affect subsequent installations and maintenance operations of cables and other services. In order to update charts, the national Hydrographic Institute, or any ot
16、her local Authority, has to be provided with the as-laid and as-built cable route information both after completion of the installation works, and after any repair if significant route changes occur. This will enable the proper design of project routes for future underwater services and cables, and
17、allow safe maintenance activities over existing lines so that overlaying and plants damage can be avoided. 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 pu
18、blication, the editions indicated were valid. All Recommendations and other references are subject to revision; 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
19、 the currently valid ITU-T Recommendations is regularly published. - ITU-T Recommendation G.972 (2000), DeJinition of terms relevant to opticalJifibre submarine cable systems. ITU-T Recommendation G.976 (2000), Test methods applicable to optical$bre submarine cable systems. - 3 As-Laid Report The co
20、mpanies in charge of the installation of cables in shallow waters, especially close to the landing points of sea, lake and river shores, should provide the Purchasers with an As-laid Report after the completion of the work and a Maintenance/Repair Log after any repair or replacement. The as-laid rep
21、ort should contain, at least, the following information: - detailed As-laid position list (both in geographical and plane coordinates with progressive Kilometer Posts along the route) with all the relevant points such as Turning Points, course alterations, joint positions and crossing points with ot
22、her services (active and retired). Such a position list should be provided with geodetic references and local datum shift parameters ITU-T Rec. L.29 (01/2002) I for example, from WGS-84 (World Geodetic System 84) for the main international geodetic system; general layout map with the whole cable rou
23、te and sections; detailed landing point map containing, at minimum, the following information: cable position after burial in the landing and shore approach area up to the beach joint; position of all the relevant structures at shore, if any, such as spare coils, concrete mooring blocks, signal pole
24、s; burial depth for all the above-mentioned structures; brief description and depth of the cable protections at sea in the different sections; any useful information to determine the position of the cable and any relevant structures for maintenance or new system installation purposes. 4 Maintenancem
25、epair Log Such documentation should also be updated on the basis of a Maintenance/Repair Log with the following information: - operation number and date; - - cable repair ship; - name of the plant repaired or replaced; details of repairs or replacement (cable type(s), quantity of original cable remo
26、ved, quantity of spare cable installed, repair joint(s) locations and burial as applicable); position of failure (longitude, latitude and water depth). These coordinates have to be provided in the same geodetic references showed in the As-laid Report of the plant; as-laid map (i.e. for the deviation
27、 (e.g. “omega“) or course alteration resulting on sea bed after replacement); - - - measurements. The As-laid Report and the Maintenance/Repair Log should be required in the installation or repair supply contracts, as well as the delivery time, and should be provided after the completion of the work
28、s. 2 ITU-T Rec. L.29 (012002) Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Y Series Z SERIES OF ITU-T RECOMMENDATIONS Organization
29、of the work of ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and human factors Non-telephone telecommunication services Transmission systems and media, dig
30、ital systems and networks Audiovisual and multimedia systems Integrated services digital network Cable networks and transmission of television, sound programme and other multimedia signals Protection against interference Construction, installation and protection of cables and other elements of outsi
31、de plant TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmission circuits Specifications of measuring equipment Telephone transmission quality, telephone inst
32、allations, local line networks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infrastructure and I
33、nternet protocol aspects Languages and general software aspects for telecommunication systems Printed in Switzerland Geneva, 2002 SERIES OP ITU-T RECOMMENDATIONS Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M Series N Series O Ser
34、ies P Series Q Series R Series S Series T Series U Series V Series X Series Y Series Z Organization of the work of IT-T Means of expression: defmitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operat
35、ion and human factors Non-telephone telecommunication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Cable networks and transmission of television, sound programme and other multimedia signals Protection ag
36、ainst interference Construction, installation and protection of cables and other elements of outside plant TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmis
37、sion circuits Specifications of measuring equipment Telephone transmission quality, telephone installations, local line networks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infrastructure and Internet protocol aspects Languages and general software aspects for telecommunication systems Printed in Switzerland Geneva, 2002
