ITU-T M 2101 1-1997 Performance Limits for Bringing-Into-Service and Maintenance of International SDH Paths and Multiplex Sections - Series M TMN and Network Maintenance Internatio.pdf

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1、I NTERNATI ONAL TELECOMM U N KATION UN ION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU M.21 O1 .I (04197) SERIES M: TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS, TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS International transport network Pe rfo rma n ce

2、 I i m its f o r b ri n g i n g -i n to-s e rv i ce a n d maintenance of international SDH paths and multiplex sections ITU-T Recommendation M.2101. I (Previously CCITT Recommendation) ITU-T M-SERIES RECOMMENDATIONS TMN AND NETWORK MAINTENANCE: INTERNATIONAL TRANSMISSION SYSTEMS, TELEPHONE CIRCUITS,

3、 TELEGRAPHY, FACSIMILE AND LEASED CIRCUITS Introduction and general principles of maintenance and maintenance organization international transmission systems International telephone circuits Common channel signalling systems International telegraph systems and phototelegraph transmission Internation

4、al leased group and supergroup links International 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

5、Integrated services digital networks Common channel 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.1100-M.1199 M.1200-M.1299 M. 1300-M. 1399 M.1400-M.1999 M.2000-M.2999 M.3000-M.3599 M. 3600-M. 3999 M.4000-M.4999 Ii For further details

6、, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION M.2101.1 PERFORMANCE LIMITS FOR BRINGING-INTO-SERVICE AND MAINTENANCE OF INTERNATIONAL SDH PATHS AND MULTIPLEX SECTIONS Summary This Recommendation provides limits for bringing-into-service and maintenance for international SDH pa

7、ths and international SDH multiplex sections. Error, timing and availability performance events are addressed. This Recommendation also deals with all levels of PDH signals transported within SDH containers. Source ITU-T Recommendation M.2101.1 was prepared by ITU-T Study Group 4 (1997-2000) and was

8、 approved under the WTSC Resolution No. 1 procedure on the 19th of April 1997. Keywords Allocated Performance Objective (APO), Bringing-Into-Service (BIS), Bringing-Into-Service Performance Objective (BISPO), Degraded Performance Limit (DPL), Errored Second (ES), Limits, Maintenance, Performance Obj

9、ectives, Severely Errored Second (SES), Unacceptable Performance Limit (UPL). FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. Th

10、e 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 years, establishes the topics

11、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 fall within ITU-Ts purview, the

12、 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 telecornmunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attenti

13、on 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 asserted by ITU members or othe

14、rs 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 cautioned that this may not r

15、epresent 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 and microfilm, without permissi

16、on in writing from the ITU. 11 Recommendation M.2101.1 (04/97) 1 2 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 7 7.1 8 8.1 9 9.1 9.2 9.3 10 10.1 CONTENTS Page Scope References Definitions Usage of the terms “path“ and “multiplex section“ in this Recommendation Definition of performance objectives . Definition of

17、international portion Path Core Elements The international boundary and border crossing points . International paths operating in tandem . Definition of in-service measurement points 3.7.1 STM-N section layer . 3.7.2 Higher-Order Path Layer . 3.7.3 Lower-Order Path Layer . Abbreviations . Convention

18、s Hypothetical reference model for performance of international path and multiplex section layers Allocation principles of end-to-end VC connections . VC connections using rings . Performance objectives . Principles Evaluation of error performance parameters Evaluation of ES/SES parameters from in-s

19、ervice measurements . Scope 9.2.1 General 9.2.2 In-service anomaly information 9.2.3 In-service defect information 9.2.4 Remote anomaly and defect indication . Out-of-Service (00s) measurements . 9.3.1 General 9.3.2 Possible 00s measurement methods Performance limits General . Recommendation M.2101.

20、1 (04/97) 1 1 3 3 3 3 4 4 5 6 8 9 10 10 12 12 12 12 12 12 12 13 13 13 13 13 . 111 10.2 10.3 10.4 11 12 12.1 12.2 12.3 10.1.1 Relationship between performance limits and objectives . 10.1.2 Types of limits . Process for calculation of path performance limits . Process for calculation of multiplex sec

21、tion performance limits Performance limits and methodology for BIS 10.2.1 BIS limit values . Performance limits for maintenance . 10.3.1 Performance levels and limits . 1 0.3.2 Thresholds . Long-term quality monitoring/measurement Effects of timing impairments on error performance . Availability and

22、 unavailability . Criteria for entry/exit for the Unavailable State . Inhibiting performance monitoring during unavailable time . 1 O . 1.3 10.1.4 Unavailability limits . Annex A . Example applications of path allocation (A%) from Table 2A . Annex B . Annex C . Annex D - Default Unacceptable Perform

23、ance Level threshold values Page 13 14 14 15 16 17 17 18 18 19 19 19 19 20 21 21 22 23 37 iv Recommendation M.2101.1 (04/97) Introduction This Recommendation provides limits for bringing-into-service, and limits for maintenance of international SDH paths and international SDH multiplex sections in o

24、rder to achieve the performance objectives given for a multiservice environment. These objectives include error performance (Recommendation G. 826), timing performance (Recommendation G.822) and availability (Recommendation G. 827). This Recommendation defines the parameters and their associated obj

25、ectives in order to respect the principles given in Recommendations M.20, M.32 and M.34. “International“ in this Recommendation refers to SDH paths and multiplex sections which cross international boundaries with a change in jurisdictional responsibility. The methods and procedures for applying thes

26、e limits are described in Recommendation M.2110 for the bringing-into-service procedures and in Recommendation M.2 120 for the maintenance procedures. This Recornmendation uses certain principles which are the basis of the maintenance of a digital network: - It is desirable to do in-service, continu

27、ous measurements. In some cases, out-of-service measurements may be necessary. A single set of parameters must be used for maintenance of the SDH hierarchy (however the actual limits are bit rate dependent). Error performance limits of international SDH paths and multiplex sections are dependent on

28、the medium used. - - This Recommendation covers the error performance limits and in-service and out-of-service parameter evaluation criteria for SDH paths and multiplex sections. Recommendation M.2101.1 (04/97) V Recommendation M.2101.1 PERFORMANCE LIMITS FOR BRINGING-INTO-SERVICE AND MAINTENANCE OF

29、 INTERNATIONAL SDH PATHS AND MULTIPLEX SECTIONS (Geneva, 1997) 1 Scope Within the scope of this Recommendation are bringing-into-service and maintenance of intemational SDH paths and multiplex sections and also SDH signals transported over PDH networks. For the case of PDH signals transported over S

30、DH networks, Recommendation M.2100 applies to the PDH part, and this Recommendation applies to the SDH part. Further guidance is given in the main body of this Recommendation on how M.2100 and M.2101.1 relate. “International“ in this Recommendation refers to SDH paths and multiplex sections which cr

31、oss international boundaries with a change in jurisdictional responsibility. This Recommendation does not consider commissioning of SDH equipment into the network. The lowest bit-rate considered by this Recommendation is the SDH VC1 bit rate. It does not, therefore, consider 64 kbit/s circuits or su

32、b-64 kbit/s which are dealt with by Recommendations M.2100 and M.1340, respectively. The SDH signal format and structure is described in Recommendation G.707. The long-term error performance objectives for SDH networks are given in Recommendation G.826. For availability performance, Recommendation G

33、.827 provides the long-term requirements. Availability performance requirements from a short-term maintenance perspective are under study. Recommendation G.803 provides a modeling method for describing the functions which exist or are required to make up a telecommunications network. This modeling m

34、ethod has been used where appropriate within this Recommendation. 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 pe

35、rformance information from Bit Interleaved Parity-Ns (BIP-N) and other path overhead information are given. Tandem connection monitoring is not considered in this Recommendation, but may be introduced in the future. Automatic RestoratiodProtection events are considered. The guidance given in this Re

36、commendation in terms of performance limits for maintenance purposes, and that given in the companion Recommendations M.2110 and M.2120 provide a consistent platform from which the requirements for a maintenance management system can be derived. 2 References The following ITU-T Recommendations and o

37、ther 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; all users of this Recommendation are therefore enco

38、uraged 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. Recommendation M.2101.1 (04/97) 1 11 2 3 4 CCITT Recommendation G.702 (1988), Digital hierar

39、chy bit rates. CCITT Recommendation G.703 ( 199 1 ), Physical/electrical characteristics of hierarchical digital interfaces. ITU-T Recommendation G.707 (1 996), Network node interface for the Synchronous Digital Hierarchy (SDH). ITU-T Recommendation G.782 (1 994), Types and general characteristics o

40、f Synchronous Digital Hierarchy (SOH) equipment. NOTE - Recommendation G.782 has been replaced by Recommendation G.783 (1997). ITU-T Recommendation G.783 (1 997), Characteristics of Synchronous Digital Hierarchy (SDH) equipment functional blocks. ITU-T Recommendation G.803 (1 997), Architectures of

41、transport networks based on the Synchronous Digital Hierarchy (SDH). CCITT Recommendation G.822 (1 988), Controlled slip rate objectives on an international digital connection. ITU-T Recommendation G.825 (1993), The control of jitter and wander within digital networks which are based on the Synchron

42、ous Digital Hierarchy (SOH). ITU-T Recommendation G.826 (1 996), Error performance parameters and objectives for international, constant bit-rate digital paths at or above the primary rate. ITU-T Recommendation G.827 (1 996), Availabiliw parameters and Objectives for path elements of international c

43、onstant bit-rate digital paths at or above the primary rate. Draft Recommendation G.EPMRS, Error performance events for SDH multiplex and regenerator sections has not yet a definite G-Series number and the text is not yet published. 121 CCITT Recommendation M.20 (1 992), Maintenance philosophy for t

44、elecommunications networks. 131 CCITT Recommendation M.32 (1 988), Principles for using alarm information for maintenance of international transmission systems and equipment. 141 CCITT Recommendation M.34 (1988), Performance monitoring on international transmission systems and equipment. 151 ITU-T R

45、ecommendation M.2 1 O0 (1 995), Performance limits for bringing-into-service and maintenance of international PDHpaths, sections and transmission systems. 1 61 ITU-T Recommendation M.2 1 1 O (1 997), Bringing-into-service of international PDH paths, sections and transmission systems and SDHpaths and

46、 multiplex sections. 1 71 ITU-T Recommendation M.2 120 (1 997), PDH path, section and transmission system and SDHpath and multiplex section fault detection and localization procedures. 181 ITU-T Recommendation M. 1340 (1 996), Performance allocations and limits for international data transmission li

47、nks and systems. 191 ITU-T Recommendation O. 150 (1 996), General requirements for instrumentation for performance measurements on digital transmission equipment. 20 ITU-T Recommendation O. 18 1 (I 996), Equipment to asses error performance on STM-N interfaces. 5 6 7 SI 9 1 O 1 i 2 Recommendation M.

48、2101.1 (0497) 3 Definitions This Recommendation defines the following terms. 3.1 In this Recommendation, the terms “path“ and “multiplex section“ describe unidirectional transport entities. For a bi-directional path or multiplex section all objectives, limits, etc. should be applied to each directio

49、n of the trail independently from the other direction. This means that for maintenance purposes, performance events occurring on the A-2 direction shall not have any impact on the evaluation of performance events occurring on the Z-A direction, and vice versa. Usage of the terms llpath“ and “multiplex section“ in this Recommendation 3.2 Definition of performance objectives 3.2.1 hypothetical reference path (see Figure 3/G.826) or multiplex section. performance objective (PO): Performance objective for the intemational portion of the 3.2.2 according