1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.983.4TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(12/2003) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Optical line systems for local and access networks A broadband opti
2、cal access system with increased service capability using dynamic bandwidth assignment Amendment 1: New Annex A Performance monitoring parameters ITU-T Recommendation G.983.4 (2001) Amendment 1ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL T
3、ELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON
4、 RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TESTING EQUIPMENTS G.500G.599 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTI
5、ONS AND DIGITAL LINE SYSTEM G.900G.999 General G.900G.909 Parameters for optical fibre cable systems G.910G.919 Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s G.920G.929 Digital line transmission systems on cable at non-hierarchical bit rates G.930G.939 Digital line sy
6、stems provided by FDM transmission bearers G.940G.949 Digital line systems G.950G.959 Digital section and digital transmission systems for customer access to ISDN G.960G.969 Optical fibre submarine cable systems G.970G.979 Optical line systems for local and access networks G.980G.989 Access networks
7、 G.990G.999 QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DIGITAL TERMINAL EQUIPMENTS G.7000G.7999 DIGITAL NETWORKS G.8000G.8999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.983
8、.4 (2001)/Amd.1 (12/2003) i ITU-T Recommendation G.983.4 A broadband optical access system with increased service capability using dynamic bandwidth assignment Amendment 1 New Annex A Performance monitoring parameters Summary This annex describes requirements and specifications for the performance m
9、onitoring function in Dynamic Bandwidth Assignment (DBA) for Broadband Passive Optical Network (B-PON) as G.983.4 AM1. These requirements and specifications provide backward compatibility with the current ITU-T Rec. G.983.4. Source Amendment 1 to ITU-T Recommendation G.983.4 was approved on 14 Decem
10、ber 2003 by ITU-T Study Group 15 (2001-2004) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.983.4 (2001)/Amd.1 (12/2003) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Stan
11、dardization 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 (WTSA), w
12、hich 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 within
13、 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 Recommenda
14、tion 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 as “m
15、ust“ 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 Recommendation
16、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 of t
17、his 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 patent da
18、tabase. ITU 2004 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. G.983.4 (2001)/Amd.1 (12/2003) iii CONTENTS Page New Annex A. 1 ITU-T Rec. G.983.4 (2001)/Amd.1 (12/2003) 1 ITU-T Recommendation G.983
19、.4 A broadband optical access system with increased service capability using dynamic bandwidth assignment Amendment 1 New Annex A Performance monitoring parameters 1) New Annex A Add the following Annex A: A.1 Scope Dynamic Bandwidth Assignment (DBA) efficiently allocates resources for variable bit
20、rate traffic transfer over Broadband Passive Optical Networks (B-PON). The requirements and detailed specifications in its core functions have been finalized in the main part of ITU-T Rec. G.983.4. This annex provides extended functionalities of DBA focusing on performance monitoring. It specifies r
21、equirements and specifications for these functions. These specifications are implemented in the OLT, and do not have interactions with the ONT. However, since this function has affinity with DBA itself, it is positioned as a normative part of ITU-T Rec. G.983.4 as Annex A. These requirements and spe
22、cifications are optional, and do not request any modifications to the existing DBA related recommendations (ITU-T Recs G.983.4 and G.983.7). The use of them depends on operators policies. This relationship is shown as Figure A.1. G.983.4AMD.1_FA-1NMLONTOLT GrantPurpose of DBA PM (G.983.4 AM1)-Manage
23、ment of results of actual traffic monitor-Management of results of calculation of updated BW-Guideline for interface to NML(including EML)Upstream dataScope of G.983.4No impact for G.983.4 and G.983.7Figure A.1/G.983.4 Purpose and position of Annex A A.2 References The following ITU-T Recommendation
24、s 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 Recommendation are therefore e
25、ncouraged 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 it, as a stand-alone
26、 document, the status of a Recommendation. 2 ITU-T Rec. G.983.4 (2001)/Amd.1 (12/2003) 1 ITU-T Recommendation Q.834.1 (2001), ATM-PON requirements and managed entities for the network element view. 2 ITU-T Recommendation G.983.7 (2001), ONT management and control interface specification for dynamic
27、bandwidth assignment (DBA) B-PON system. A.3 Abbreviations This annex uses the following abbreviations: EMS Element Management System NMS Network Management System A.4 Requirements for performance monitoring The performance monitoring function should be generic, independent of implementation of B-PO
28、N system. This function does not request any modifications of the existing DBA Recommendations (ITU-T Recs G.983.4 and G.983.7). Objectives of this function are summarized as follows. Provide trending data to indicate if the operator needs to adjust the assignment of guaranteed or additional bandwid
29、ths. Provide trending data to determine if the DBA mechanism is performing equitably across T-CONTs of the same type. The two management entities are regarded as conformed entities, such as Traffic engineering for DBA and Fairness verification for every T-CONT type. Although one or more are specifie
30、d in each category, all the parameters may not be applied for the system. Operators can select which parameters are applied for DBA management in real service situation. A.5 Specifications of performance monitoring parameters There are two categories to manage DBA performance, such as Traffic engine
31、ering for DBA and Fairness verification for every T-CONT type. These entities are positioned as history data to report monitoring results in NMS (Network Management System). This clause describes specifications of these entities. 1) Traffic engineering PM history data Parameter #1: The number of rec
32、eived cells except for idle cells at ODN interface in OLT1per T-CONT. #2: The number of assigned grants at the interface per T-CONT. Definition The number of receiving cells shows a total number of valid cells in real traffic flow of a T-CONT at ODN interface in OLT. OLT measures the number for a sa
33、mple interval and calculates a rate according to (the number of receiving cells at ODN interface in OLT)/(the number of issued grants at the interface) for every T-CONT. OLT keeps a maximum value and a minimum value of the rate in a reporting interval, and sends them to EMS with an average value of
34、the rate at the end of the every reporting interval. The lengths of a sample interval and a reporting interval should be determined when OLT is installed. _ 1See Figure 4/G.983.1. ITU-T Rec. G.983.4 (2001)/Amd.1 (12/2003) 3 Example of usage Operators recognize utilization of a T-CONT by #1/#2. Opera
35、tors can provision T-CONT parameters according to its T-CONT type. For example, assigned best effort bandwidth in T-CONT Types 4 and 5 can be changed. Relationship with Management Entities in ITU-T Rec. Q.834.1 This history data is attached to “T-CONT Buffer“ in ITU-T Rec. Q.834.1. 2) Fairness verif
36、ication PM history data Parameter #1: Variance (Assigned bandwidth/Actual demanded bandwidth) among T-CONTs for T-CONT Type 2. #2: Variance (Assigned bandwidth/Actual demanded bandwidth) among T-CONTs for T-CONT Type 3. #3: Variance (Assigned bandwidth/Actual demanded bandwidth) among T-CONTs for T-
37、CONT Type 4. #4: Variance (Assigned bandwidth Fixed bandwidth)/(Actual demanded bandwidth Fixed bandwidth) among T-CONTs for T-CONT Type 5. NOTE Variance (X) = E(X2) E(X)2.Definition These parameters are used for confirmation of fairness of actual traffic load. Assigned bandwidth means total bandwid
38、th for a T-CONT, that is sum of Fixed bandwidth, Assured bandwidth, Non-assured bandwidth, and Best effort bandwidth. Actual demanded bandwidth means bandwidth that should be assigned for a T-CONT if there is no request from other T-CONTs. In short, it is the ideally assigned bandwidth. It can be de
39、rived from reporting value of SR-DBA or from idle cell monitoring for each T-CONT in NSR-DBA. OLT calculates these variances in every sample period. OLT calculates average of variances calculated by each sample period for a reporting period. It reports this average to EMS at the end of this reportin
40、g period. The lengths of a sample interval and a reporting interval should be determined when OLT is installed. Example of usage Usually, in the same T-CONT type, this value is small, because surplus bandwidths are equally distributed for each T-CONT in the same T-CONT. If it indicates the large val
41、ue, operators recognize unfair assignment. Relationship with Management Entities in ITU-T Rec. Q.834.1 These history data are attached to “TC-Adapter“ in ITU-T Rec. Q.834.1. Geneva, 2004 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series B Means of expression: definiti
42、ons, symbols, classification Series C General telecommunication statistics Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital
43、systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protecti
44、on of cables and other elements of outside plant Series M TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of
45、 measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks and open system communications Series Y Global information infrastructure, Internet protocol aspects and Next Generation Networks Series Z Languages and general software aspects for telecommunication systems
