1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T G.997.2 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2 (07/2016) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Metallic access networks Physical
2、 layer management for G.fast transceivers Amendment 2 Recommendation ITU-T G.997.2 (2015) Amendment 2 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE
3、 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 RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINA
4、TION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 General G.900G.909 Parameters for optical fibre cable systems
5、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 systems provided by FDM transmission bearers G.940G.949 Digital line systems G.950G.959 Digital section
6、 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 Metallic access networks G.990G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G
7、.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.997.2 (2015)/Amd.2 (07/2016) i Rec
8、ommendation ITU-T G.997.2 Physical layer management for G.fast transceivers Amendment 2 Summary Recommendation ITU-T G.997.2 specifies the physical layer management for fast access to subscriber terminals (G.fast) transmission systems. It specifies managed objects for configuration, fault, status, i
9、nventory and performance management. Amendment 1 includes: New managed objects to support the test parameters of Amendment 1 to Recommendation ITU-T G.9701 (2014). New managed objects to support the low power modes of Amendment 1 to Recommendation ITU-T G.9701 (2014). Correction to the valid range o
10、f DELAYMAXds/us. Clarification regarding the generation of near-end failure. Fixes to several editorial typographical errors. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G.997.2 2015-05-22 15 11.1002/1000/12375 1.1 ITU-T G.997.2 (2015) Cor. 1 2016-03-29 15 11.1002/1000/1
11、2800 1.2 ITU-T G.997.2 (2015) Amd. 1 2016-05-07 15 11.1002/1000/12555 1.3 ITU-T G.997.2 (2015) Amd. 2 2016-07-22 15 11.1002/1000/12799 Keywords Distribution point unit, DPU, G.fast transceivers, management, performance monitoring. _ * To access the Recommendation, type the URL http:/handle.itu.int/
12、in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.997.2 (2015)/Amd.2 (07/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of
13、 telecommunications, information and communication technologies (ICTs). 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 t
14、elecommunications 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 t
15、he procedure laid 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
16、 a telecommunication 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 a
17、ll of these mandatory 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 R
18、IGHTSITU 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 I
19、TU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may
20、 not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.9
21、97.2 (2015)/Amd.2 (07/2016) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Management architecture 4 6 Network management protocol . 6 7 Managed objects . 6 7.1 Line c
22、onfiguration objects 19 7.2 Channel configuration objects 35 7.3 Data path configuration objects 39 7.4 Line failures 39 7.5 Channel failures 40 7.6 Data path failures 40 7.7 Line performance monitoring objects 40 7.8 Channel performance monitoring objects 45 7.9 Data path performance monitoring obj
23、ects 46 7.10 Line test, diagnostics and status objects . 46 7.11 Channel test, diagnostics and status objects . 60 7.12 Data path test, diagnostics and status objects . 65 7.13 Inventory objects 65 7.14 Link State related managed objects 68 8 Procedures for performance monitoring functions . 69 8.1
24、Line transmission states 69 8.2 Threshold reports 69 8.3 Unavailable and available state filters 70 8.4 TR1 filter 71 8.5 TR2 filter 71 8.6 Evaluation of TR1 71 8.7 Evaluation of TR2 71 8.8 Threshold report evaluation during transmission state changes . 71 8.9 Performance history storage in network
25、elements 71 8.10 Register size 72 8.11 Parameter counts 72 iv Rec. ITU-T G.997.2 (2015)/Amd.2 (07/2016) Page 8.12 Date/time-stamping of reports 72 8.13 Inhibiting performance monitoring parameters 72 Annex A to Annex W. 73 Annex X Cross-layer link state objects . 74 X.1 Overview of cross-layer link
26、state objects 74 X.2 Cross-Layer Low power Mode Control . 74 Appendix I Broadband Forum considerations on the FTTdp deployment scenario . 79 Bibliography. 80 Rec. ITU-T G.997.2 (2015)/Amd.2 (07/2016) 1 Recommendation ITU-T G.997.2 Physical layer management for G.fast transceivers Amendment 2 Editori
27、al note: This is a complete-text publication. Modifications introduced by this amendment are shown in revision marks relative to Recommendation ITU-T G.997.2 (2015) plus its Cor.1 (2016) and Amd.1 (2016). 1 Scope This Recommendation specifies the physical layer management for fast access to subscrib
28、er terminals (G.fast) transmission systems. It specifies managed objects for configuration, fault, status, inventory and performance management. The list of managed objects applies at the distribution point unit-Northbound (DPU-NB) interface, relating to the “DPU-MIB“ nomenclature used in ITU-T G.97
29、01. The managed objects are defined to provide, at least, all the information necessary for translation into a YANG data model b-IETF RFC 6020, although this does not exclude translation to other formats such as an abstract syntax notation one (ASN.1) (ITU-T X.680 series) management information base
30、 (MIB) description used in connection with the simple network management protocol (SNMP) b-IETF RFC 1157. The definition of the YANG data model for G.fast-managed objects is outside the scope of this Recommendation. 2 References The following ITU-T Recommendations and other references contain provis
31、ions 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 encouraged to investigate the possibil
32、ity 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 document, the status of a Recommenda
33、tion. ITU-T G.994.1 Recommendation ITU-T G.994.1 (2012), Handshake procedures for digital subscriber line transceivers. ITU-T G.9700 Recommendation ITU-T G.9700 (2014), Fast access to subscriber terminals (G.fast) Power spectral density specification. ITU-T G.9701 Recommendation ITU-T G.9701 (2014),
34、 Fast access to subscriber terminals (G.fast) Physical layer specification. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 managed resource b-ITU-T M.3010: The abstraction of those aspects of a telecommunication resource (logical or ph
35、ysical) required for telecommunications management. 2 Rec. ITU-T G.997.2 (2015)/Amd.2 (07/2016) 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 AdminStatus: (Based on clause 12.1.1.7 of ITU-T G.9701) The AdminStatus represents the configured, desired s
36、tate of the interface. The AdminStatus “up“ is equivalent with the interface “enabled=true“, where the desired link state is L0, L2.1N, L2.1B, or L2.2. The AdminStatus “down“ is equivalent with the interface “enabled=false“, where the desired link state is L3. NOTE The relation between the AdminStat
37、us (“up“ or “down“) and the interface (enabled=“true“ or “false“) is defined in the IETF YANG Data Model for Interface Management b-IETF RFC 7223. 3.2.2 anomaly: A discrepancy between the actual and desired characteristics of an item. The desired characteristic may be expressed in the form of a spec
38、ification. An anomaly may or may not affect the ability of an item to perform a required function. 3.2.3 defect: A limited interruption in the ability of an item to perform a required function. It may or may not lead to maintenance action depending on the results of additional analysis. Successive a
39、nomalies causing a decrease in the ability of an item to perform a required function are considered a defect. 3.2.4 empty array: An array whose number of elements is zero. 3.2.5 failure: A termination of the ability of an item to perform a required function. NOTE After failure, the item has a fault.
40、 Analysis of successive anomalies or defects affecting the same item can lead to the item being considered as “failed“. 3.2.6 managed object: The management view of a managed resource. 3.2.7 DPU-NB interface: The interface between the persistent management agent and the management entity of the dist
41、ribution point unit. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: ASN.1 Abstract Syntax Notation one CV Code Violation CV-C Code Violation Channel DPU Distribution Point Unit DPU-NB DPU Northbound DRA Dynamic Resource Allocation ES Errored Second FA
42、ST Fast Access to Subscriber Terminals FE Far-End FRA Fast Rate Adaptation FTTdp Fibre To The distribution point FTTx Fibre To The x FTU FAST Transceiver Unit FTU-O FAST Transceiver Unit Central office end (i.e., network operator end of the loop) FTU-R FAST Transceiver Unit Remote side (i.e., subscr
43、iber end of the loop) Rec. ITU-T G.997.2 (2015)/Amd.2 (07/2016) 3 GDR Gamma Data Rate G.fast fast access to subscriber terminals LOM Loss of Margin LOM-FE Far-End Loss of Margin LOR Loss of RMC LOR-FE Far-End Loss of RMC LORS LOR Second LOS Loss of Signal LOS-FE Far-End Loss of Signal LOSS LOS Secon
44、d LPR Loss of Power LPR-FE Far-End Loss of Power MIB Management Information Base MDU Multi-Dwelling Unit ME Management Entity NDR Net Data Rate NDRds downstream Net Data Rate NDRus upstream Net Data Rate NE Network Element NMS Network Management System NT Network Termination OLR On-Line Reconfigurat
45、ion OSS Operations Support Systems PM Performance Monitoring PMA Persistent Management Agent PMD Physical Media Dependent PMS-TC Physical Media Specific Transmission Convergence PSD Power Spectral Density REIN Repetitive Electrical Impulse Noise RMC Robust Management Channel RPA RMC Parameter Adjust
46、ment SES Severely Errored Second SNMP Simple Network Management Protocol SNR Signal-to-Noise Ratio SRA Seamless Rate Adaptation TDD Time Division Multiplexing TPS-TC Transport Protocol Specific Transmission Convergence 4 Rec. ITU-T G.997.2 (2015)/Amd.2 (07/2016) TR Threshold Report UAS UnAvailable S
47、econd U-O Loop interface Central office end U-R Loop interface Remote side (i.e., subscriber end of the loop) 5 Management architecture The management of an access node (AN) or a distribution point unit (DPU) is performed by the network management system (NMS), passing management information over th
48、e Q reference point to each ANs management entity (ME) (see Figure 5-1a) or through a persistent management gent (PMA) to the each DPUs ME (see Figure 5-1b). The NMS may also monitor each G.fast transceiver unit remote side (FTU-R) via the related network terminations (NTs) ME and G reference point.
49、 The connection between the ME functions at the AN or DPU and at the NT is established over management channels provided by the G.fast transceiver unit central office ends (FTU-Os) and FTU-Rs via the copper pairs. Figure 5-1a Reference model of traditional AN deployment (shown for line 1 in all N lines (N1) connected to an AN) Figure 5-1b Reference model of FTTdp deployment with PMA and DPU (shown for line 1 in all N lines (N=1) connected to
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