1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T M.2100TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (04/2003) SERIES M: TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS International transport network Performance limits for
2、 bringing-into-service and maintenance of international multi-operator PDH paths and connections ITU-T Recommendation M.2100 ITU-T M-SERIES RECOMMENDATIONS TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Introduction and
3、general principles of maintenance 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 lea
4、sed group and supergroup links 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
5、International transport network 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.2100 (04/2003) i ITU-T
6、 Recommendation M.2100 Performance limits for bringing-into-service and maintenance of international multi-operator PDH paths and connections Summary This Recommendation provides limits for bringing-into-service and maintenance of international multi-operator PDH paths which operate at or above the
7、primary rate, and connections which operate below the primary rate. Error, timing and availability performance are considered. A method for deriving ES and SES from in-service measurement is given for all hierarchical levels. Sections are not covered by this Recommendation. BIS limits and maintenanc
8、e procedures for radio sections are described in the relevant ITU-R Recommendations. Source ITU-T Recommendation M.2100 (2003) was approved by ITU-T Study Group 4 (2001-2004) under the ITU-T Recommendation A.8 procedure on 13 April 2003. Keywords Availability, bringing-into-service (BIS), digital pa
9、th, digital connection, error performance parameter, errored second (ES), maintenance limit, performance allocation, performance objective (PO), severely errored second (SES), unavailability. ii ITU-T Rec. M.2100 (04/2003) FOREWORD The International Telecommunication Union (ITU) is the United Nation
10、s 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 standardizing telecommunicatio
11、ns 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 covered by the procedure la
12、id 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 ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunic
13、ation administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these manda
14、tory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws a
15、ttention 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 members or ot
16、hers outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had/had 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 rep
17、resent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2003 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.2100 (04/2003) iii CONTENTS Page 1 Scope
18、1 2 References. 1 3 Terms and definitions . 4 4 Abbreviations 5 5 Reference models 5 5.1 Hypothetical reference performance models for international 64 kbit/s connections. 5 5.2 Hypothetical reference performance model for international primary and higher order paths. 6 6 Performance objectives. 9 6
19、.1 Connections operating below the primary rate. 9 6.2 Primary rate and higher bit rates 10 7 Allocation principles. 10 8 Evaluation of error performance events . 13 8.1 Evaluation of ES/SES events from in-service measurements 13 8.2 Evaluation of ES/SES events from out-of-service measurements . 14
20、8.3 Definition of ratios . 15 9 Performance limits General considerations. 16 9.1 Relationship between performance limits and objectives 16 9.2 Type of limits . 16 10 Performance limits for bringing-into-service . 17 10.1 Calculation of the BIS limits 17 10.2 BIS limits values. 18 11 Performance lim
21、its for maintenance. 18 11.1 Performance levels and limits 18 11.2 Performance thresholds 19 12 Long-term quality monitoring/measurement 20 13 Effects of timing impairments on error performance . 20 14 Availability and unavailability . 20 14.1 Definitions of available and unavailable states 20 14.2
22、Consequences for error performance measurements 21 14.3 Inhibiting performance monitoring during unavailable time . 21 14.4 Unavailability limits . 21 iv ITU-T Rec. M.2100 (04/2003) Page Annex A Example applications of PO allocation from Tables 2a and 2b 22 Annex B In-service ES and SES event evalua
23、tion criteria . 23 Annex C Values for bringing-into-service limits for international digital paths 30 Annex D Default unacceptable performance level thresholds for international digital paths 42 ITU-T Rec. M.2100 (04/2003) 1 ITU-T Recommendation M.2100 Performance limits for bringing-into-service an
24、d maintenance of international multi-operator PDH paths and connections 1 Scope The purpose of this Recommendation is to provide limits for bringing-into-service and limits for maintenance of international multi-operator digital PDH paths which operate at or above the primary rate, and connections w
25、hich operate below the primary rate, in order to achieve the performance objectives given for a multiservice environment. These objectives include error performance (ITU-T Recs G.821 and G.826), timing performance (ITU-T Rec. G.822) and availability. This Recommendation defines the parameters and th
26、eir associated objectives in order to respect the principles given in ITU-T Recs M.20, M.32 and M.34. “International multi-operator“ in this Recommendation refers to PDH paths and connections which cross international boundaries with a change in jurisdictional responsibility. The methods and procedu
27、res for applying these limits are described in ITU-T Rec. M.2110 for the bringing-into-service procedures and in ITU-T Rec. M.2120 for the maintenance procedures. This Recommendation uses certain principles which are the basis of the maintenance of a digital network: it is desirable to do in-service
28、, continuous measurements. In some cases (e.g., for bringing-into service), out-of-service measurements may be necessary; a single set of parameters must be used for maintenance of every level of the hierarchy (this principle does not apply to limits); error performance limits of transmission system
29、s are dependent on the medium used; however, due to the many possible network structures, error performance limits on paths are independent of the medium. Since the performance limits are intended to satisfy the needs of the evolving digital network, it must be recognized that such limits might not
30、be achieved by all of todays digital equipment and systems. Currently, this Recommendation covers the error performance limits for paths at every level of the PDH hierarchy and in-service parameter evaluation criteria up to the quarternary layer and, for connections below the primary rate, down to 6
31、4 kbit/s. Sections are not covered. By bilateral agreement, ITU-R Rec. F.1330-1 may be used in conjunction with this Recommendation for radio-relay systems where applicable. Throughout this Recommendation the terms “path“ and “connections“ should be understood as digital. 2 References The following
32、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 revision; users of this Recommenda
33、tion 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. The reference to a document within this Recommendation does not give
34、it, as a stand-alone document, the status of a Recommendation. 2 ITU-T Rec. M.2100 (04/2003) ITU-R Recommendation F.1330-1 (1999), Performance limits for bringing-into-service of the parts of international plesiochronous digital hierarchy and synchronous digital hierarchy paths and sections implemen
35、ted by digital radio-relay systems. ITU-T Recommendation G.703 (2001), Physical/electrical characteristics of hierarchical digital interfaces. ITU-T Recommendation G.704 (1998), Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels. ITU-T Recommendation G.
36、706 (1991), Frame alignment and cyclic redundancy check (CRC) procedures relating to basic frame structures defined in Recommendation G.704. ITU-T Recommendation G.724 (1988), Characteristics of a 48-channel low bit rate encoding primary multiplex operating at 1544 kbit/s. ITU-T Recommendation G.732
37、 (1988), Characteristics of primary PCM multiplex equipment operating at 2048 kbit/s. ITU-T Recommendation G.733 (1988), Characteristics of primary PCM multiplex equipment operating at 1544 kbit/s. ITU-T Recommendation G.734 (1988), Characteristics of synchronous digital multiplex equipment operatin
38、g at 1544 kbit/s. ITU-T Recommendation G.735 (1988), Characteristics of primary PCM multiplex equipment operating at 2048 kbit/s and offering synchronous digital access at 384 kbit/s and/or 64 kbit/s. ITU-T Recommendation G.736 (1993), Characteristics of a synchronous digital multiplex equipment ope
39、rating at 2048 kbit/s. ITU-T Recommendation G.737 (1988), Characteristics of an external access equipment operating at 2048 kbit/s offering synchronous digital access at 384 kbit/s and/or 64 kbit/s. ITU-T Recommendation G.738 (1988), Characteristics of primary PCM multiplex equipment operating at 20
40、48 kbit/s and offering synchronous digital access at 320 kbit/s and/or 64 kbit/s. ITU-T Recommendation G.739 (1988), Characteristics of an external access equipment operating at 2048 kbit/s offering synchronous digital access at 320 kbit/s and/or 64 kbit/s. ITU-T Recommendation G.742 (1988), Second
41、order digital multiplex equipment operating at 8448 kbit/s and using positive justification. ITU-T Recommendation G.743 (1988), Second order digital multiplex equipment operating at 6312 kbit/s and using positive justification. ITU-T Recommendation G.745 (1988), Second order digital multiplex equipm
42、ent operating at 8448 kbit/s and using positive/zero/negative justification. ITU-T Recommendation G.747 (1988), Second order digital multiplex equipment operating at 6312 kbit/s and multiplexing three tributaries at 2048 kbit/s. ITU-T Recommendation G.751 (1988), Digital multiplex equipments operati
43、ng at the third order bit rate of 34 368 kbit/s and the fourth order bit rate of 139 264 kbit/s and using positive justification. ITU-T Recommendation G.752 (1988), Characteristics of digital multiplex equipments based on a second order bit rate of 6312 kbit/s and using positive justification. ITU-T
44、 Recommendation G.753 (1988), Third order digital multiplex equipment operating at 34 368 kbit/s and using positive/zero/negative justification. ITU-T Rec. M.2100 (04/2003) 3 ITU-T Recommendation G.754 (1988), Fourth order digital multiplex equipment operating at 139 264 kbit/s and using positive/ze
45、ro/negative justification. ITU-T Recommendation G.755 (1988), Digital multiplex equipment operating at 139 264 kbit/s and multiplexing three tributaries at 44 736 kbit/s. ITU-T Recommendation G.761 (1988), General characteristics of a 60-channel transcoder equipment. ITU-T Recommendation G.762 (1988
46、), General characteristics of a 48-channel transcoder equipment. ITU-T Recommendation G.775 (1998), Loss of Signal (LOS) and Alarm Indication Signal (AIS) and Remote Defect Indication (RDI) defect detection and clearance criteria for PDH signals. ITU-T Recommendation G.793 (1988), Characteristics of
47、 60-channel transmultiplexing equipments. ITU-T Recommendation G.794 (1988), Characteristics of a 24-channel transmultiplexing equipment. ITU-T Recommendation G.821 (2002), Error performance of an international digital connection operating at a bit rate below the primary rate and forming part of an
48、Integrated Services Digital Network. ITU-T Recommendation G.822 (1988), Controlled slip rate objectives on an international digital connection. ITU-T Recommendation G.823 (2000), The control of jitter and wander within digital networks which are based on the 2048 kbit/s hierarchy. ITU-T Recommendati
49、on G.824 (2000), The control of jitter and wander within digital networks which are based on the 1544 kbit/s hierarchy. ITU-T Recommendation G.826 (2002), End-to-end error performance parameters and objectives for international, constant bit-rate digital paths and connections. ITU-T Recommendation H.221 (1999), Frame structure for a 64 kbit/s to 1920 kbit/s channel in audiovisual teleservices. ITU-T Recommendation M.20 (1992), Maintenance philosophy for telecommunication networks. ITU-T R
