1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T M.2110TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2002) SERIES M: TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS International transport network Bringing into service
2、international multi-operator paths, sections and transmission systems ITU-T Recommendation M.2110 ITU-T M-SERIES RECOMMENDATIONS TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Introduction and general principles of maint
3、enance and maintenance organization M.10M.299 International transmission systems M.300M.559 International telephone circuits M.560M.759 Common channel signalling systems M.760M.799 International telegraph systems and phototelegraph transmission M.800M.899 International leased group and supergroup li
4、nks M.900M.999 International leased circuits M.1000M.1099 Mobile telecommunication systems and services M.1100M.1199 International public telephone network M.1200M.1299 International data transmission systems M.1300M.1399 Designations and information exchange M.1400M.1999 International transport net
5、work M.2000M.2999 Telecommunications management network M.3000M.3599 Integrated services digital networks M.3600M.3999 Common channel signalling systems M.4000M.4999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. M.2110 (07/2002) i ITU-T Recommendation M.2110 Brin
6、ging into service international multi-operator paths, sections and transmission systems Summary This Recommendation provides procedures for bringing into service international multi-operator paths, sections and transmission systems with and without in-service monitoring. These tests and procedures a
7、re applicable whatever the technology used. Source ITU-T Recommendation M.2110 was revised by ITU-T Study Group 4 (2001-2004) and approved under the WTSA Resolution 1 procedure on 14 July 2002. Keywords Bringing into service tests, exchange of information for BIS, initial measurements, in-service mo
8、nitoring, international multi-operator transmission entities, path, procedures, section, transmission system. ii ITU-T Rec. M.2110 (07/2002) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication
9、 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 standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTS
10、A), 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 covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall w
11、ithin ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO 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 RIGH
12、TS 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 the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU
13、 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, which may be required to implement this Recommendation. However, implementors are cautioned that this m
14、ay not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2002 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. M.2110 (07/2002) iii CONTENTS Pag
15、e 1 Scope 1 2 References. 1 3 Terms and definitions . 2 4 Abbreviations 2 5 Exchange of information and coordination 2 6 Measurements. 3 7 Bringing into service tests 3 7.1 Continuity test 4 7.2 Test15m 4 7.3 Test2h . 4 7.4 Test24h . 4 8 Bringing into service procedures 4 8.1 Initial measurements of
16、 a section . 5 8.1.1 General . 5 8.1.2 BIS testing procedure . 5 8.2 Initial measurements of a path 5 8.2.1 Determining the BIS limits. 5 8.2.2 General considerations on BIS testing procedure 6 8.3 Bringing into service more than one path at the same time and with identical routing 7 8.3.1 Procedure
17、 for bringing into service multiple tributaries on an existing higher order path with identical routing . 7 8.3.2 Procedure for bringing into service multiple tributaries on a new higher order path with identical routing 8 8.4 BIS of more than one path with not identical routing 9 8.5 Contingency pl
18、anning. 9 ITU-T Rec. M.2110 (07/2002) 1 ITU-T Recommendation M.2110 Bringing into service international multi-operator paths, sections and transmission systems 1 Scope This Recommendation covers bringing international multi-operator transmission entities into service. These transmission entities inc
19、lude paths, sections, and transmission systems that cross international and operator boundaries. This involves control and sub-control stations whose roles are specified in ITU-T Recs M.80 3 and M.90 4. Various administrative and technical measures are applicable to these operations. Such measures a
20、re distinct from equipment acceptance procedures (commissioning) resulting from a contract with a supplier (internal or external to the Administration). In this Recommendation, the distinction is made between bringing into service (BIS) procedures with and without in-service monitoring (ISM). If the
21、re are no ISM capabilities, initial out-of-service (OOS) measurements will be the only way of checking operations without disturbing traffic. Before loading the entities concerned with traffic, there must be no doubt concerning performance. If it is possible to perform in-service measurements, e.g.
22、if there is a CRC or other such mechanism, BIS measurements without traffic can be reduced, provided particular attention is paid to the entity when it is first put into operation. This Recommendation only describes tests and procedures, dealing with the counting of the number of occurrences of erro
23、r performance events. First of all, tests are described (see clause 7). Subsequently, procedures that show the progression of tests are explained according to the tested transmission entity. No performance event is defined in this Recommendation. For the definition of the error performance events, a
24、nd the set of them that applies to BIS and their limits, refer to the specific technology Recommendations. 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 publ
25、ication, 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 t
26、he currently valid ITU-T Recommendations is regularly published. 1 ITU-T Recommendation M.60 (1993), Maintenance terminology and definitions. 2 ITU-T Recommendation M.75 (1992), Technical service. 3 ITU-T Recommendation M.80 (1988), Control stations. 4 ITU-T Recommendation M.90 (1988), Sub-control s
27、tations. 5 ITU-T Recommendation M.570 (1988), Constitution of the circuit; preliminary exchange of information. 6 ITU-T Recommendation M.1400 (2001), Designations for interconnections among operators networks. 7 ITU-T Recommendation M.2120 (2002), International multi-operator paths, sections and tra
28、nsmission systems fault detection and localization procedures. 2 ITU-T Rec. M.2110 (07/2002) 8 ITU-T Recommendation O.150 (1996), General requirements for instrumentation for performance measurements on digital transmission equipment. 9 ITU-T Recommendation O.151 (1992), Error performance measuring
29、equipment operating at the primary rate and above. 10 ITU-T Recommendation O.181 (2002), Equipment to assess error performance on STM-N interfaces. 3 Terms and definitions General terms and definitions relating to this Recommendation are provided in ITU-T Rec. M.60 1. 4 Abbreviations This Recommenda
30、tion uses the following abbreviations: BIS Bringing Into Service CRC Cyclic Redundancy Check FL Fault Localization ISM In-Service Monitoring OOS Out-of-Service RFS Ready For Service SDH Synchronous Digital Hierarchy 5 Exchange of information and coordination The technical services (see ITU-T Rec. M.
31、75 2) concerned designate the control and sub-control stations for the transmission entity to be brought into operation, in accordance with ITU-T Recs M.80 3 and M.90 4. As far as cooperation between operators is concerned, only two classes of through-connection station need to be designated by any
32、country: a) stations, which exercise control functions for international transmission entities; b) stations nearest the frontier, which, in this Recommendation, are referred to as frontier stations. The technical service should indicate the routing to be followed and the method given in ITU-T Rec. M
33、.570 5 can be applied. Designation information required for the control station is specified in ITU-T Rec. M.1400 6. The overall routing form, for an entire block or path, is drawn up by the control station on the basis of information provided by its technical service and by each sub-control station
34、 for the sections for which the sub-control station is responsible. The control stations for each end of an international path, etc. must coordinate their activities in the two directions of transmission. These consist of: checking that the designation information (including path trace identifier in
35、formation, if applicable) is consistent in both locations; checking that the technical configuration information is consistent in both locations (e.g. CRC-4 interworking, framing format, SDH adaptation function); ensuring work orders are received by the participating control and sub-control stations
36、; ensuring work is executed; ITU-T Rec. M.2110 (07/2002) 3 recording difficulties and transmitting them to the relevant departments for attention; setting initial measurement dates; determining BIS limits in accordance with the specific technology Recommendations; coordinating measurements; collecti
37、ng measurement results and declaring whether requirements are met or not met in agreement with the other control stations; exchanging test results as appropriate; making the necessary fault localization arrangements, as indicated in ITU-T Rec. M.2120 7, if initial measurements do not meet requiremen
38、ts; ensuring that the means for ISM, if provided, are operational; validating data bases (network configuration, description and maintenance data bases); declaring the entity Ready For Service (RFS). 6 Measurements Initial measurements will be made using instruments with a pseudo-random or framed ps
39、eudo-random bit sequence in conformity with ITU-T Recs O.150 8 and O.151 9 or a measurement mode in accordance with ITU-T Rec. O.181 10 or in accordance with new requirements for optical measurements. In the case of bidirectional transmission, the measurement configuration must conform to one of the
40、 arrangements shown in Figure 1, i.e. either per-direction or loopback. M.2110_F01b) Loopback measurementM.Eq.a) Per-direction measurementM.Eq.M.Eq.T.Eq. T.Eq.T.Eq. T.Eq.T.Eq. Transmission system or multiplex section termination equipmentM.Eq. Measurement equipmentFigure 1/M.2110 Measurement configu
41、rations Tandem connection measurements For further study. 7 Bringing into service tests For bringing transmission entities into service, several tests are necessary according to the concerned transmission entity. These tests consist of recording the number of occurrences of performance events over a
42、 certain duration and comparing the result with a limit value. Limit values are different according to the type of tests and the tested transmission entity. These limits are defined for each performance event and for each test in the specific technology Recommendations. Tests 15 m, 2 h and 24 h shou
43、ld be applied to each direction of transmission. Wherever possible, the per-direction measurement configuration should be used. For a bidirectional path or section, the test is considered passed if both directions meet the limits, or failed if either direction fails the limit. 4 ITU-T Rec. M.2110 (0
44、7/2002) 7.1 Continuity test This test consists of verifying the continuity of the link, during a short period of time (15 minutes maximum). For a per-direction measurement, the continuity test consists of sending bit errors with a test set at both termination points. The test is considered passed if
45、 each path termination point receives the sent errors. For a loopback measurement, the continuity test consists in opening and closing the loop. The test is considered passed if the test set (see Figure 1) receives AIS when the loop is opened. In either configuration, if the continuity test failed,
46、fault localization and correction must be carried out. 7.2 Test15m This test consists of recording the number of occurrences of each performance event for a time period of 15 minutes and comparing the result with a single limit value, named S15. The test is considered passed if the number of occurre
47、nces for all performance events is less than or equal to S15. The test is considered failed if unavailability occurs or the number of occurrences for at least one performance event is greater than S15; in this case, fault localization and correction must be carried out. 7.3 Test2h This test consists
48、 of recording the number of occurrences of each performance event for a time period of 2 hours and comparing the result with a single limit value, named S2. The test is considered passed if the number of occurrences for all performance events is less than or equal to S2. The test is considered faile
49、d if unavailability occurs or the number of occurrences for at least one performance event is greater than S2; in this case, fault localization and correction must be carried out. 7.4 Test24h This test consists of recording the number of occurrences for each performance event for a time period of 24 hours and comparing the result with a single limit value, named S24. The test is considered passed if the number of occurrences for all performance events is less than or equal to S24. Th
