1、 International Telecommunication Union ITU-T G.993.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2004) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Access networks Very high speed digital subscriber line transceivers ITU-T Rec
2、ommendation G.993.1 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 OF INTERNATION
3、AL 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 TESTING EQUIPMENTS G.500G.599
4、 TRANSMISSION MEDIA 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 rat
5、e 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.969
6、 Optical fibre submarine cable systems G.970G.979 Optical line systems for local and access networks G.980G.989 Access networks 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.
7、7000G.7999 DIGITAL NETWORKS G.8000G.8999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.993.1 (06/2004) i ITU-T Recommendation G.993.1 Very high speed digital subscriber line transceivers Summary G.993.1 VDSL (Very high speed Digital Subscriber Line) permits the
8、 transmission of asymmetric and symmetric aggregate data rates up to tens of Mbit/s on twisted pairs. G.993.1 includes worldwide frequency plans that allow asymmetric and symmetric services in the same group of twisted pairs (known as a binder). G.993.1 transceivers must overcome many types of ingre
9、ss interference from radio and other transmission techniques that occur in the same frequencies of typical deployment scenarios. Similarly, G.993.1 transmission power transmission levels have been designed to minimize potential egress interference into other transmission systems. As with other Recom
10、mendations in the G.99x series, G.993.1 uses G.994.1 to handshake and initiate the transceiver training sequence. Source ITU-T Recommendation G.993.1 was approved on 13 June 2004 by ITU-T Study Group 15 (2001-2004) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.993.1 (06/2004) FOREWOR
11、D The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. 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
12、 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 study by the ITU-T study groups which, in turn, produce Recommendations on these topics
13、. 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 a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “A
14、dministration“ 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 contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and
15、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 requirements. The use of such words does not suggest that compliance with the Recommendat
16、ion is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU 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 claim
17、ed 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 intellectual property, protected by patents, which may be required to implement this Recommendat
18、ion. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2005 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission
19、of ITU. ITU-T Rec. G.993.1 (06/2004) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations 3 5 Reference models 5 5.1 General reference models. 5 5.2 Functional reference model 6 5.3 Protocol reference model 7 6 Transmission medium interface characteristics 7 6.1 Duplexing meth
20、od 7 6.2 Power Spectral Density (PSD) . 8 6.3 Upstream Power Back-Off (UPBO). 9 6.4 Termination impedance 10 6.5 Return loss 11 6.6 Output signal balance . 11 7 TPS-TC sublayer general functional characteristics. 11 7.1 / interface specification 11 7.2 OC TPS-TC application interface (O, R) descript
21、ion. 12 8 PMS-TC sublayer . 13 8.1 PMS-TC functional model . 13 8.2 Scrambler 14 8.3 Forward error correction. 14 8.4 Interleaving. 15 8.5 Framing. 17 9 PMD sublayer . 21 9.1 PMD functional model . 21 9.2 PMD functional characteristics 22 10 Management . 30 10.1 OAM functional model. 30 10.2 OAM com
22、munication channels 31 10.3 Embedded operations channel (eoc) functions and description . 33 10.4 Fault and performance monitoring . 41 10.5 OAM parameters and primitives 43 10.6 VDSL Overhead Channel (VOC). 49 11 Performance requirements 53 11.1 Error performance requirements. 53 11.2 Latency requi
23、rements . 53 iv ITU-T Rec. G.993.1 (06/2004) Page 11.3 Impulse noise immunity requirements . 53 12 Initialization 54 12.1 Handshake VTU-O 54 12.2 Handshake VTU-R 56 12.3 Link state and timing diagram 60 12.4 Link activation/deactivation method 62 13 Electrical requirements . 86 13.1 Service splitter
24、s 86 14 Testing methodology 87 14.1 VDSL test loop types 87 14.2 Impairment generators 87 14.3 Transmission performance tests . 94 Annex A Bandplan A 96 Annex B Bandplan B 97 Annex C Bandplan C 97 Annex D Requirements for Region A (North America). 98 D.1 Physical interface 98 D.2 Testing methodology
25、 98 Annex E Requirements for Region B (Europe) 99 E.1 Physical interface 99 E.2 Testing methodology 99 Annex F Regional requirements for environment coexisting with TCM-ISDN DSL as defined in Appendix III/G.961 . 100 F.1 Bandplan and PSD masks. 100 F.2 Service splitter 104 F.3 Test loops and crossta
26、lk disturbers. 126 Annex G ATM-TC 138 G.1 Scope 138 G.2 Reference model for ATM transport 138 G.3 Transport of ATM data. 139 G.4 ATM Transport Protocol Specific TC (ATM_TC) 140 Annex H PTM-TC 143 H.1 Packetized data transport 143 H.2 Transport of PTM data . 144 H.3 Interface description . 144 H.4 PT
27、M TPS-TC functionality 146 Annex I Specifics of implementation in systems using QAM modulation. 149 I.1 Physical Media Specific TC (PMS-TC) sublayer 149 I.2 Physical medium-dependent (PMD) sublayer 157 ITU-T Rec. G.993.1 (06/2004) v Page I.3 Operations and maintenance. 167 I.4 Link activation and de
28、-activation . 186 I.5 Complementary information on QAM implementation (informative). 207 Appendix I UTOPIA implementation of the ATM-TC interface . 210 Appendix II International amateur radio bands 212 Appendix III 8.625-kHz tone spacing. 213 III.1 Scope 213 III.2 PMD functional characteristics 213
29、III.3 Transmission Convergence (TC) sublayer . 214 III.4 Initialization 214 BIBLIOGRAPHY 217 ITU-T Rec. G.993.1 (06/2004) 1 ITU-T Recommendation G.993.1 Very high speed digital subscriber line transceivers 1 Scope G.993.1 VDSL (Very high speed Digital Subscriber Line) permits the transmission of asy
30、mmetric and symmetric aggregate data rates up to tens of Mbit/s on twisted pairs. G.993.1 is an access technology that exploits the existing infrastructure of copper wires that were originally deployed for POTS services. While POTS uses approximately the lower 4 kHz and ADSL/HDSL use approximately 1
31、 MHz of the copper wire spectrum, G.993.1 uses up to 12 MHz of the spectrum. G.993.1 can be deployed from central offices or from Fibre-fed cabinets located near the customer premises. G.993.1 includes worldwide frequency plans that allow asymmetric and symmetric services in the same group of wire p
32、airs (known as a binder). This is accomplished by designating frequency bands for the transmission of upstream and downstream signals. G.993.1 transceivers must overcome many types of ingress interference from radio and other transmission techniques that occur in the same frequencies of typical depl
33、oyment scenarios. Similarly, G.993.1 transmission power levels have been designed to minimize potential egress interference into other transmission systems. As with other Recommendations in the G.99x series, G.993.1 uses G.994.1 to handshake and initiate the transceiver training sequence. It has bee
34、n agreed in the ITU-T to develop a subsequent VDSL2 Recommendation that specifies only DMT modulation, and that is based on this Recommendation (VDSL) and on ITU-T Rec. G.992.3 (ADSL2). 2 References The following ITU-T Recommendations and other references contain provisions which, through reference
35、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 possibility of applying the most recen
36、t 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 Recommendation. ITU-T Recommendation G.1
37、17 (1996), Transmission aspects of unbalance about earth. ITU-T Recommendation G.227 (1988), Conventional telephone signal. ITU-T Recommendation G.994.1 (2003), Handshake procedures for digital subscriber line (DSL) transceivers. ITU-T Recommendation G.996.1 (2001), Test procedures for digital subsc
38、riber line (DSL) transceivers. ITU-T Recommendation G.997.1 (2003), Physical layer management for digital subscriber line (DSL) transceivers. ITU-T Recommendation I.432.1 (1999), B-ISDN user-network interface Physical layer specification: General characteristics. ITU-T Recommendation O.9 (1999), Mea
39、suring arrangements to assess the degree of unbalance about earth. 2 ITU-T Rec. G.993.1 (06/2004) ISO/IEC 3309:1993, Information technology Telecommunications and information exchange between systems High-level data link control (HDLC) procedures Frame structure. 3 Definitions This Recommendation de
40、fines the following terms: 3.1 bit error ratio: The ratio of the number of bits in error to the number of bits sent over a period of time. 3.2 channel: A connection conveying signals between two blocks (the conveyed signals represent information). Channels also convey signals between a block and the
41、 environment. Channels may be unidirectional or bidirectional. 3.3 connection: An association of transmission channels or circuits, switching and other functional units set up to provide a means for a transfer of user, control and management information between two or more end points (blocks) in a t
42、elecommunication network. 3.4 downstream: Information flow whose direction is from an End-Service Provider System to an End-Service Consumer System. 3.5 electrical length: An estimate of the loop attenuation, assuming that all the sections of cable obey a f attenuation characteristic. Specifically,
43、the electrical length is the attenuation, in dB at 1 MHz, of an equivalent hypothetical loop with a perfect f attenuation characteristic. NOTE The attenuation caused by bridged taps does not follow a f characteristic, and thus the effects of bridged taps may not be accurately represented in the esti
44、mate. 3.6 interface: A point of demarcation between two blocks through which information flows from one block to the other. See logical- and physical-interface definitions for further details. An interface may be a physical interface or a logical interface. 3.7 layer/sublayer: A collection of object
45、s of the same hierarchical rank. 3.8 logical information flow path: A sequence of information transfers from an initial information source object to a terminal information destination object, either directly or through intermediate objects. Different physical information flow paths may be associated
46、 with a logical information flow path segment or with the entire path, in different implementations. 3.9 logical (functional) interface: An interface where the semantic, syntactic, and symbolic attributes of information flows are defined. Logical interfaces do not define the physical properties of s
47、ignals used to represent the information. A logical interface can be an internal or external interface. It is defined by a set of information flows and associated protocol stacks. 3.10 management plane (MP): A plane that contains management information. 3.11 management information: Information excha
48、nged by Management Plane objects; it may content information or control information. 3.12 network: A collection of interconnected elements that provide connection services to users. 3.13 network control function: The network control function is responsible for the error-free receipt and transmission
49、 of content flow information to and from the server. 3.14 network termination (NT): The element of the Access Network performing the connection between the infrastructures owned by the Access Network operator and the Service-Consumer System (ownership decoupling). The NT can be passive or active, transparent or not. 3.15 noise margin: The maximum amount by which the reference noise level can be increased during a BER test without causing the modem to fail the BER requirement. ITU-T Rec. G.993.1 (06/2004)
