1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T M.2101TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2003) 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 SDH paths and multiplex sections ITU-T Recommendation M.2101 ITU-T M-SERIES RECOMMENDATIONS TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Introducti
3、on and 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 Internatio
4、nal leased 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.1400
5、M.1999 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.2101 (06/2003)
6、i ITU-T Recommendation M.2101 Performance limits for bringing-into-service and maintenance of international multi-operator SDH paths and multiplex sections Summary This Recommendation provides limits for Bringing-Into-Service (BIS) and maintenance for international multi-operator SDH paths, includin
7、g tandem connections, and international multi-operator SDH multiplex sections using equipment designed according to ITU-T Recs G.826, G.828 and G.829. Error, timing and availability performance are considered. This Recommendation also deals with all levels of PDH signals transported within SDH conta
8、iners. Regenerator sections are not covered by this Recommendation. BIS limits and maintenance procedures for radio regenerator sections are described in the relevant ITU-R Recommendations. Maintenance of systems designed to ITU-T Recs G.826, G.828 and G.829 should use the limits given in this Recom
9、mendation. This revised Recommendation includes all applicable material from ITU-T Rec. M.2101.1 and is therefore the only Recommendation to be used for SDH technology. Source ITU-T Recommendation M.2101 was approved by ITU-T Study Group 4 (2001-2004) under the ITU-T Recommendation A.8 procedure on
10、13 June 2003. Keywords Allocated Performance Objective (APO), Background Block Error (BBE), Bringing-Into-Service (BIS), Bringing-Into-Service Performance Objective (BISPO), Degraded Performance Level (DPL), Errored Second (ES), Limits, Maintenance, Performance Objectives, Severely Errored Second (S
11、ES), Severely Errored Period (SEP), Tandem Connection Monitoring (TCM), Unacceptable Performance Level (UPL). ii ITU-T Rec. M.2101 (06/2003) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication
12、 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
13、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
14、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. Compliance with this Recom
15、mendation 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 mandatory provisions are met. The words “shall“ or some other obligatory language such
16、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 attention to the possibility that the practice or implementation of this Recommenda
17、tion 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 others outside of the Recommendation development process. As of the date of approval
18、 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 may not represent the latest information and are therefore strongly urged to consult the TSB pate
19、nt 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.2101 (06/2003) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Terms and definitions . 3 4 Abbreviations 5 5 Hypothetical referen
20、ce model. 6 6 Allocation principles for end-to-end VC connections 8 7 Performance objectives. 10 8 Evaluation of error performance events . 12 8.1 Evaluation of ES/BBE/SES events from in-service measurements . 13 8.2 Out-of-Service (OOS) measurements. 13 9 Performance limits general considerations 1
21、3 9.1 Relationship between performance limits and objectives 14 9.2 Types of limits 14 10 Performance limits for bringing-into-service . 15 10.1 Calculation of path performance objectives and limits 15 10.2 BIS limit values for paths. 16 10.3 Calculation of multiplex sections performance objectives
22、and limits 16 10.4 BIS limit values for multiplex sections 18 11 Performance limits for maintenance. 18 11.1 Performance levels and limits 18 11.2 Performance limit thresholds 19 12 Long-term quality monitoring/measurement 20 13 Effects of timing impairments on error performance . 20 14 Availability
23、 and unavailability . 20 14.1 Criteria for entry/exit to/from the unavailable state . 20 14.2 Consequences for error performance measurements 21 14.3 Inhibiting performance monitoring during unavailable time . 21 14.4 Unavailability limits . 22 Annex A Example applications of path allocation from Ta
24、ble 2a 22 Annex B In-service ES, BBE and SES event evaluation criteria 23 Annex C Values for bringing-into-service limits for international digital paths and multiplex sections, based on ITU-T Rec. G.826 25 Annex D Values for bringing-into-service limits for international digital paths and multiplex
25、 sections, based on ITU-T Rec. G.828 34 Annex E Default unacceptable performance level threshold values. 44 iv ITU-T Rec. M.2101 (06/2003) Introduction This Recommendation provides limits for bringing-into-service and maintenance of international multi-operator SDH paths and multiplex sections in or
26、der to achieve the performance objectives given for a multi-service environment. These objectives include error performance (ITU-T Recs G.826 and G.828), timing performance (ITU-T Rec. G.822) and availability (ITU-T Rec. G.827). This Recommendation defines the parameters and their associated objecti
27、ves 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 SDH paths and multiplex sections which cross international boundaries with a change in jurisdictional responsibility. The SDH signal format and structure ar
28、e described in ITU-T Rec. G.707. The long-term error performance objectives for SDH paths are given in ITU-T Recs G.826 and G.828. For availability performance, ITU-T Rec. G.827 provides the long-term requirements. Availability performance requirements from a short-term maintenance perspective are u
29、nder study. ITU-T Rec. G.803 provides a modelling method for describing the functions which exist or are required to make up a telecommunications network. This modelling method has been used where appropriate within this Recommendation. The methods and procedures for applying these limits are descri
30、bed in ITU-T Rec. M.2110 for bringing-into-service tests and procedures and in ITU-T Rec. M.2120 for the maintenance procedures. This Recommendation uses certain principles that form the basis of the maintenance of a digital network: It is desirable to do in-service, continuous measurements. In some
31、 cases, out-of-service measurements may be necessary. A single set of parameters must be used for maintenance of the SDH hierarchy (see ITU-T Rec. G.702), however, the actual limits are bit rate dependent. Error performance limits of international SDH paths and multiplex sections are dependent on th
32、e medium used. The reasons for revising this Recommendation include the addition of Tandem Connection Monitoring (TCM), Background Block Error (BBE)1measurements and the Severely Errored Period (SEP) event in accordance with ITU-T Rec. G.828. This revised Recommendation includes all applicable mater
33、ial from ITU-T Rec. M.2101.1 and is therefore the only Recommendation to be used for SDH technology. The use of the SEP event and limits for maintenance are under study. _ 1BBE measures will not be required for installed equipment designed according to ITU-T Rec. G.826. ITU-T Rec. M.2101 (06/2003) 1
34、 ITU-T Recommendation M.2101 Performance limits for bringing-into-service and maintenance of international multi-operator SDH paths and multiplex sections 1 Scope This Recommendation defines the performance objectives and limits for bringing-into-service and maintenance of international multi-operat
35、or SDH paths and multiplex sections and also SDH signals transported over PDH networks. For the case of PDH signals transported over SDH networks, ITU-T Rec. M.2100 applies to the PDH path. For the case of mixed PDH/SDH terminated paths, ITU-T Rec. M.2100 applies (at the PDH bit rate). Further guida
36、nce is given in the main body of this Recommendation on how ITU-T Recs M.2100 and M.2101 relate. “International“ in this Recommendation refers to SDH paths and multiplex sections which cross international boundaries with a change in jurisdictional responsibility. SDH regenerator sections are not cov
37、ered by this Recommendation. By bilateral agreement, ITU-R Rec. F.1330-1 may be used in conjunction with this Recommendation for radio-relay systems where applicable. Maintenance of SDH systems designed to ITU-T Recs G.826, G.828 and G.829 should use the limits given in the relevant parts of this Re
38、commendation. The use of the SEP event and limits for maintenance are under study2. This Recommendation does not consider commissioning of SDH equipment into the network. The SDH VC-11 bit rate is the lowest considered by this Recommendation. It does not, therefore, consider 64 kbit/s circuits or su
39、b-64 kbit/s, which are dealt with by ITU-T Recs M.2100 and M.1340. Limits for BIS and maintenance are given for Virtual Containers (VC) and Synchronous Transport Module-N (STM-N). Limits are also given for triggering maintenance activity (e.g., repair, fault localization, etc.). Methods of deriving
40、performance information from Bit Interleaved Parity-Ns (BIP-N) and other path overhead information are given. Tandem connection monitoring is considered in this Recommendation. The guidance given in this Recommendation in terms of performance limits for maintenance purposes, and that given in the co
41、mpanion ITU-T Recs M.2110 and M.2120 provide a consistent platform from which the requirements for a maintenance management system can be derived. This revised Recommendation includes all applicable material from ITU-T Rec. M.2101.1 and is therefore the only Recommendation to be used for SDH technol
42、ogy. 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 re
43、vision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the _ 2As provided in section 8.5.4 of Resolution 1 of the 1996 WTSC, the United States of America registers a degree of reservation against the use of the objectives in Tables 3a/M.2101 and D.1
44、to D.4/M.2101, and intends to treat the values of these tables as though their entries were designated “FFS“, i.e., for further study. As the text of ITU-T Rec. G.828, approved in Kyoto in March 2000, places no numeric end-to-end performance objectives on the SEPI parameter, the use of numeric maint
45、enance objectives in ITU-T Rec. M.2101 is unjustified. 2 ITU-T Rec. M.2101 (06/2003) 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 n
46、ot give it, as a stand-alone document, the status of a Recommendation. 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 implemented by digital radio-r
47、elay systems. ITU-T Recommendation G.702 (1988), Digital hierarchy bit rates. ITU-T Recommendation G.707/Y.1322 (2000), Network node interface for the synchronous digital hierarchy (SDH). ITU-T Recommendation G.784 (1999), Synchronous digital hierarchy (SDH) management. ITU-T Recommendation G.803 (2
48、000), Architectures of transport networks based on the synchronous digital hierarchy (SDH). ITU-T Recommendation G.822 (1988), Controlled slip rate objectives on an international digital connection. ITU-T Recommendation G.825 (2000), The control of jitter and wander within digital networks which are
49、 based on the synchronous digital hierarchy (SDH). 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 G.827 (2000), Availability parameters and objectives for path elements of international constant bit-rate digital paths at or above the primary rate. ITU-T Recommendation G.828 (2000), Error performance parameters and objectives for international, constant bit-rate synchronou
