1、 International Telecommunication Union ITU-T G.997.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2012) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Access networks Physical layer management for digital subscriber line transcei
2、vers Recommendation ITU-T G.997.1 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 INDIVIDUAL CHARACTERISTICS
3、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 G.450G.499 TRANSMISSION ME
4、DIA 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 hierarchical bit rates based on a bit
5、 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 customer access to ISDN G.960G
6、.969 Optical fibre submarine cable systems G.970G.979 Optical line systems for local and access networks G.980G.989 Access networks G.990G.999MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPOR
7、T 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.997.1 (06/2012) i Recommendation ITU-T G.997.1 Physical layer management for digital subscriber line transceiver
8、s Summary Recommendation ITU-T G.997.1 specifies the physical layer management for asymmetric digital subscriber line (ADSL) and very high speed digital subscriber line 2 (VDSL2) transmission systems. It specifies means of communication on a transport transmission channel defined in the physical lay
9、er Recommendations ITU-T G.992.1, ITU-T G.992.2, ITU-T G.992.3, ITU-T G.992.4, ITU-T G.992.5 and ITU-T G.993.2. It specifies network elements (NE) content and syntax for configuration, fault and performance management. The revision of this Recommendation includes the management information base (MIB
10、) elements for the physical layer management of Recommendation ITU-T G.993.2 and additional MIB elements for the physical layer management of Recommendations ITU-T G.992.3 and ITU-T G.992.5. History Edition Recommendation Approval Study Group 1.0 ITU-T G.997.1 1999-07-02 15 2.0 ITU-T G.997.1 2003-05
11、-22 15 2.1 ITU-T G.997.1 (2003) Amd. 1 2003-12-14 15 2.2 ITU-T G.997.1 (2003) Amd. 2 2005-01-13 15 3.0 ITU-T G.997.1 2005-09-06 15 4.0 ITU-T G.997.1 2006-06-06 15 4.1 ITU-T G.997.1 (2006) Cor. 1 2006-12-14 15 4.2 ITU-T G.997.1 (2006) Amd. 1 2006-12-14 15 4.3 ITU-T G.997.1 (2006) Amd. 2 2007-11-22 15
12、 4.4 ITU-T G.997.1 (2006) Amd. 3 2008-08-22 15 5.0 ITU-T G.997.1 2009-04-22 15 5.1 ITU-T G.997.1 (2009) Cor. 1 2009-11-13 15 5.2 ITU-T G.997.1 (2009) Amd. 1 2010-06-11 15 5.3 ITU-T G.997.1 (2009) Amd. 2 2010-11-29 15 5.4 ITU-T G.997.1 (2009) Amd. 3 2011-06-22 15 5.5 ITU-T G.997.1 (2009) Cor. 2 2011-
13、10-29 15 5.6 ITU-T G.997.1 (2009) Amd. 4 2011-12-16 15 5.7 ITU-T G.997.1 (2009) Amd. 5 2012-02-13 15 6.0 ITU-T G.997.1 2012-06-13 15 ii Rec. ITU-T G.997.1 (06/2012) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, i
14、nformation 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 telecommunications on a
15、 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 the procedure laid down
16、 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 a telecommunication a
17、dministration 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 all of these mandatory
18、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 RIGHTS ITU draws attent
19、ion 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 ITU members or others
20、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 not represent the la
21、test information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 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.997.1 (06/2012) iii Ta
22、ble of Contents Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations and acronyms 3 5 Overview 6 5.1 Physical layer management mechanisms . 7 6 OAM communications channel 8 6.1 Requirements on the physical media dependent (PMD) layer for the bit-oriented clear embedded operations channel (
23、EOC) 9 6.2 Requirements on the PMD layer for the message-oriented clear EOC 10 6.3 Data link layer 10 6.4 The SNMP protocol 13 7 Management information base (MIB) elements . 15 7.1 Failures . 18 7.2 Performance monitoring functions . 20 7.3 Configuration functions 32 7.4 Inventory information . 69 7
24、.5 Test, diagnostic and status parameters . 71 7.6 Network management elements partitioning 94 Appendix I Processing examples 135 I.1 Illustration of transmitter processing 135 I.2 Illustration of receiver processing 136 Appendix II Downstream power back-off 137 II.1 Introduction 137 II.2 Descriptio
25、n of the DPBO method . 138 Bibliography. 141 Rec. ITU-T G.997.1 (06/2012) 1 Recommendation ITU-T G.997.1 Physical layer management for digital subscriber line transceivers 1 Scope This Recommendation specifies the physical layer management for asymmetric digital subscriber line (ADSL) and very high
26、speed digital subscriber line 2 (VDSL2) transmission systems based on the usage of indicator bits and embedded operations channel (EOC) messages defined in the ITU-T G.992.x series of ITU-T Recommendations and in ITU-T G.993.2, and the clear embedded operations channel defined in this Recommendation
27、. It specifies network management elements content for configuration, fault, and performance management. The mechanisms to provide operations, administration and maintenance (OAM) functions, and to generate OAM flows F1, F2 and F3, will depend on the transport mechanism of the physical layer transmi
28、ssion system as well as on the supervision functions contained within the physical layer termination functions of equipment. This Recommendation specifies only flow F3 transmission path level. For interrelationships of this Recommendation with other Recommendations of the ITU-T G.99x-series, see ITU
29、-T G.995.1. 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 subjec
30、t to revision; users of this Recommendation are therefore encouraged 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 wi
31、thin this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.992.1 Recommendation ITU-T G.992.1 (1999), Asymmetric digital subscriber line (ADSL) transceivers. ITU-T G.992.2 Recommendation ITU-T G.992.2 (1999), Splitterless asymmetric digital subscrib
32、er line (ADSL) transceivers. ITU-T G.992.3 Recommendation ITU-T G.992.3 (2005), Asymmetric digital subscriber line transceivers 2 (ADSL2). ITU-T G.992.4 Recommendation ITU-T G.992.4 (2002), Splitterless asymmetric digital subscriber line transceivers 2 (splitterless ADSL2). ITU-T G.992.5 Recommendat
33、ion ITU-T G.992.5 (2005), Asymmetric digital subscriber line (ADSL) transceivers Extended bandwidth ADSL2 (ADSL2plus). ITU-T G.993.2 Recommendation ITU-T G.993.2 (2006), Very high speed digital subscriber line transceivers 2 (VDSL2). ITU-T G.993.5 Recommendation ITU-T G.993.5 (2010), Self-FEXT cance
34、llation (vectoring) for use with VDSL2 transceivers. ITU-T G.994.1 Recommendation ITU-T G.994.1 (2003), Handshake procedures for digital subscriber line (DSL) transceivers. 2 Rec. ITU-T G.997.1 (06/2012) ITU-T G.995.1 Recommendation ITU-T G.995.1 (2001), Overview of digital subscriber line (DSL) Rec
35、ommendations. ITU-T G.998.4 Recommendation ITU-T G.998.4 (2010), Improved impulse noise protection for DSL transceivers. ITU-T I.432.x Recommendations ITU-T I.432.x-series, B-ISDN user-network interface Physical layer specification. ITU-T I.610 Recommendation ITU-T I.610 (1999), B-ISDN operation and
36、 maintenance principles and functions. ITU-T T.35 Recommendation ITU-T T.35 (2000), Procedure for the allocation of ITU-T defined codes for non-standard facilities. IETF RFC 1157 IETF RFC 1157 (1990), A Simple Network Management Protocol (SNMP). 3 Definitions This Recommendation defines the followin
37、g terms: 3.1 accumulation period: Period of time used by the network management system (NMS) to accumulate sufficient number of parameter samples. 3.2 anomaly: An anomaly is a discrepancy between the actual and desired characteristics of an item. The desired characteristic may be expressed in the fo
38、rm of a specification. An anomaly may or may not affect the ability of an item to perform a required function. 3.3 bearer channel: As defined in the respective Recommendation (also referred to as “frame bearer“ in various digital subscriber line (DSL) Recommendations). 3.4 clear embedded operations
39、channel (EOC): An octet oriented data channel multiplexed in the physical layer transmission frame structure. 3.5 defect: A defect is 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 a
40、nalysis. Successive anomalies causing a decrease in the ability of an item to perform a required function are considered a defect. 3.6 failure: A failure is the termination of the ability of an item to perform a required function. NOTE After failure, the item has a fault. Analysis of successive anom
41、alies or defects affecting the same item can lead to the item being considered as “failed“. 3.7 full initialization: Any type of initialization procedure defined in respective Recommendations, except short initialization. 3.8 masked subcarrier: A subcarrier that is not transmitted during initializat
42、ion and showtime. 3.9 MEDLEY set: A set of subcarriers used during the digital subscriber line (DSL) initialization. This set is defined in the respective Recommendations. 3.10 net data rate: Net data rate is defined in the ITU-T G.992.x-series Recommendations and in ITU-T G.993.2. 3.11 short initia
43、lization: Shortened type of initialization procedure, as specified in clause 7.2.1.3.3. Short initialization includes fast retrain, as specified in ITU-T G.992.2, and short initialization, as specified in ITU-T G.992.3 and ITU-T G.992.4. 3.12 showtime: As defined in the respective Recommendations. R
44、ec. ITU-T G.997.1 (06/2012) 3 3.13 xDSL: Any of the various types of digital subscriber line technologies. 3.14 -interface, -interface: Interface between the physical media specific-transmission convergence (PMS-TC) and the transport protocol specific-transmission convergence (TPS-TC) sub-layers of
45、the xTU, as defined in ITU-T G.995.1 and the respective Recommendations. 3.15 -interface: Application interface of the xTU, as defined in ITU-T G.995.1 and the respective Recommendations. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: ADSL Asymmetric
46、Digital Subscriber Line ADSL2 Asymmetric Digital Subscriber Line 2 AME ADSL Management Entity AN Access Node ATM Asynchronous Transfer Mode ATU ADSL Transceiver Unit ATU-C ADSL Transceiver Unit Central office end (i.e., network operator) ATU-R ADSL Transceiver Unit Remote side (i.e., subscriber end
47、of the loop) CRC Cyclic Redundancy Check CV Code Violation CV-C Code Violation Channel CV-CFE Code Violation Channel Far-End DMT Discrete MultiTone DPBO Downstream Power Back-Off DSL Digital Subscriber Line EOC Embedded Operations Channel ES Errored Second ES-L Errored Second Line ES-LFE Errored Sec
48、ond Line Far-End FEBE Far-End Block Error FEC Forward Error Correction FEC-C Forward Error Correction Channel FEC-CFE Forward Error Correction Channel Far-End FECS-L Forward Error Correction Second Line FECS-LFE Forward Error Correction Second Line Far-End FEXT Far End Crosstalk FFEC Far-end Forward
49、 Error Correction HDLC High-level Data Link Control HEC Header Error Control 4 Rec. ITU-T G.997.1 (06/2012) IMA Inverse Multiplexing over ATM INM Impulse Noise Monitoring ISDN Integrated Services Digital Network LCD Loss of Cell Delineation LCD-FE Far-End Loss of Cell Delineation LDSF Loop Diagnostic mode Forced LFE Line Far End LINIT Line Initialization LOF Loss of Frame LOF-FE Far-End Loss of Frame LOS Loss of Signal LOS-FE Far-End Loss of Signal LOSS-L LOS
