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 (05/2015) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Metallic access networks Physical layer man
2、agement for G.fast transceivers Recommendation ITU-T G.997.2 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 CARRIER-TRANSMISSION SYSTEMS G.200G.299
3、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 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY
4、 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 G.910G.919 Digital sections at hierarchic
5、al 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 and digital transmission systems for cus
6、tomer 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.1000G.1999 TRANSMISSION MEDIA CHARACTERI
7、STICS 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 (05/2015) i Recommendation ITU-T G.997.2 Physical layer management fo
8、r G.fast transceivers 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, inventory and performance management. History Edition Recommendatio
9、n Approval Study Group Unique ID* 1.0 ITU-T G.997.2 2015-05-22 15 11.1002/1000/12375 _ * To access the Recommendation, type the URL http:/handle.itu.int/ 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 R
10、ec. ITU-T G.997.2 (05/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. I
11、TU-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), which meets every four years, establishes the topics for s
12、tudy 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 ITU-Ts purview, the necessary standards are prepared on
13、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 Recommendation is voluntary. However, the Recommendation may contai
14、n 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 “must“ and the negative equivalents are used to express r
15、equirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property R
16、ight. 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 this Recommendation, ITU had received notice of intellect
17、ual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may 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 2015 All rights
18、reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.997.2 (05/2015) 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 .
19、 1 4 Abbreviations and acronyms 2 5 DPU management architecture . 3 6 Network management protocol . 5 7 Managed objects . 5 7.1 Line configuration objects 16 7.2 Channel configuration objects 29 7.3 Data path configuration objects 32 7.4 Line failures 32 7.5 Channel failures 33 7.6 Data path failure
20、s 33 7.7 Line performance monitoring objects 34 7.8 Channel performance monitoring objects 38 7.9 Data path performance monitoring objects 39 7.10 Line test, diagnostics and status objects . 39 7.11 Channel test, diagnostics and status objects . 46 7.12 Data path test, diagnostics and status objects
21、 . 50 7.13 Inventory objects 50 8 Procedures for performance monitoring functions . 52 8.1 Line transmission states 52 8.2 Threshold reports 52 8.3 Unavailable and available state filters 53 8.4 TR1 filter 53 8.5 TR2 filter 54 8.6 Evaluation of TR1 54 8.7 Evaluation of TR2 54 8.8 Threshold report ev
22、aluation during transmission state changes . 54 8.9 Performance history storage in network elements 54 8.10 Register size 55 8.11 Parameter counts 55 8.12 Date/time-stamping of reports 55 8.13 Inhibiting performance monitoring parameters 55 Appendix I Broadband Forum considerations on the FTTdp depl
23、oyment scenario . 56 Bibliography. 57 Rec. ITU-T G.997.2 (05/2015) 1 Recommendation ITU-T G.997.2 Physical layer management for G.fast transceivers 1 Scope This Recommendation specifies the physical layer management for fast access to subscriber terminals (G.fast) transmission systems. It specifies
24、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.9701. The managed objects are defined to provide, at least,
25、 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 (MIB) description used in connection withthe simple netw
26、ork 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 provisions which, through reference in this text, constitute pro
27、visions 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 possibility of applying the most recent edition of the Recommendat
28、ions 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 Recommendation. ITU-T G.994.1 Recommendation ITU-T G.994.1 (2012), H
29、andshake 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), Fast access to subscriber terminals (G.fast) Physical lay
30、er specification. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following term defined elsewhere: 3.1.1 managed resource b-ITU-T M.3010: The abstraction of those aspects of a telecommunication resource (logical or physical) required for telecommunications management. 3.2 Ter
31、ms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 anomaly: A discrepancy between the actual and desired characteristics of an item. The desired characteristic may be expressed in the form of a specification. An anomaly may or may not affect the ability of an it
32、em to perform a required function. 2 Rec. ITU-T G.997.2 (05/2015) 3.2.2 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 anomalies causing a decrease in th
33、e ability of an item to perform a required function are considered a defect. 3.2.3 empty array: An array whose number of elements is zero. 3.2.4 failure: A termination of the ability of an item to perform a required function. NOTE After failure, the item has a fault. Analysis of successive anomalies
34、 or defects affecting the same item can lead to the item being considered as “failed“. 3.2.5 managed object: The management view of a managed resource. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: ASN.1 Abstract Syntax Notation one CV Code Violation
35、 CV-C Code Violation Channel DPU Distribution Point Unit DPU-NB DPU Northbound DRA Dynamic Resource Allocation ES Errored Second FAST 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
36、 Transceiver Unit Central office end (i.e., network operator end of the loop) FTU-R FAST Transceiver Unit Remote side (i.e., subscriber end of the loop) 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
37、 of RMC LORS LOR Second LOS Loss of Signal LOS-FE Far-End Loss of Signal LOSS LOS Second LPR Loss of Power Rec. ITU-T G.997.2 (05/2015) 3 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 u
38、pstream Net Data Rate NE Network Element NMS Network Management System NT Network Termination OLR On-Line Reconfiguration OSS Operations Support Systems PM Performance Monitoring PMA Persistent Management Agent PMD Physical Media Dependent PMS-TC Physical Media Specific Transmission Convergence PSD
39、Power Spectral Density REIN Repetitive Electrical Impulse Noise RMC Robust Management Channel RPA RMC Parameter Adjustment 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 Protoc
40、ol Specific Transmission Convergence TR Threshold Report UAS UnAvailable Second U-O Loop interface Central office end U-R Loop interface Remote side (i.e., subscriber end of the loop) 5 DPU management architecture The management of a distribution point unit (DPU) is performed by the network manageme
41、nt system (NMS), passing management information to each DPUs management entity (ME) over the Q reference point (see Figure 5-1). The NMS may also monitor each FAST transceiver unit remote side (FTU-R) via the related network terminations (NTs) ME and G reference point. The connection between the ME
42、functions at the DPU and at the NT is established over management channels provided by the FAST transceiver unit central office ends (FTU-Os) and FTU-Rs via the copper pairs. 4 Rec. ITU-T G.997.2 (05/2015) Figure 5-1 Reference model of FTTdp deployment (shown for line 1 in all N lines (N1) connected
43、 to a DPU) Appendix I contains additional information regarding the Broadband Forum considerations on the fibre to the distribution point (FTTdp) deployment scenario. The fundamental purpose of the persistent management agent (PMA) (see Appendix I) is to allow the operations support systems (OSS)/NM
44、S to perform all operations on a given DPU whether or not that DPU is actually powered. This includes the following PMA functionality: firmware download and management; initial provisioning; configuration, including rate control; test and diagnostics; statistics gathering; event reporting; performan
45、ce monitoring (PM) history beyond current and previous interval counters; management protocol translation between Northbound to OSS and Southbound to DPU. Some of these operations have limited capabilities when the DPU is without power. For example, statistics gathering is limited to the history pre
46、sent in the PMA, since the current information is not available from the DPU. The OSS/NMS also still needs to be able to ascertain the true power state of the DPU as a whole, and of each given line, for example for diagnostics purposes. It can choose to take into account the power state of a DPU for
47、 various processes, e.g., a new firmware download, but does not have to. While distribution points are at locations where local power is typically not available, DPUs may also be deployed at locations where local powering or forward powering is available (e.g., in multi-dwelling unit (MDU) basements
48、 or in fibre to the x (FTTx) cabinets). In this case, a PMA could still exist northbound of the DPU (if the DPU could still be unpowered at times) or a PMA could be integrated with the DPU in the same physical equipment (in which case the equipment performs the PMA functionality listed above, presen
49、ting itself to the OSS/NMS as an access node). ITU-T G.9701 defines the interfaces between the FTU-O (which is part of the DPU) and the FTU-R (which is part of the NT). This Recommendation specifies the physical layer management for fast access to subscriber terminals (FAST) transmission systems as seen by the PMA. It specifies managed objects for configuration, fault, test, diagnostics, status, and inventory management, and for performance monitori
