1、 ETSI TS 102 639-3 V1.1.1 (2009-04)Technical Specification Access and Terminals, Transmission and Multiplexing (ATTM);Third Generation Transmission Systems forInteractive Cable Television Services - IP Cable Modems;Part 3: Downstream InterfaceITU-T Recommendation J.210 (11/2006), modifiedETSI ETSI T
2、S 102 639-3 V1.1.1 (2009-04) 2 Reference DTS/ATTM-02006-3 Keywords access, broadband, cable, endorsement, MAC, modem ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif e
3、nregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in co
4、ntents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the docu
5、ment may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.
6、org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2009. All rights reserved. DECTTM, PLUGTESTSTM,
7、UMTSTM, TIPHONTM, the TIPHON logo and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. LTE is a Trade Mark of ETSI currently being registered for the bene
8、fit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 102 639-3 V1.1.1 (2009-04) 3 Contents Intellectual Property Rights4 Foreword.4 Introduction 4 1 Scope 5 2 References 6 2.1 Normative references .
9、6 2.2 Informative references6 3 Definitions and abbreviations.7 3.1 Definitions7 3.2 Abbreviations .8 Endorsement notice 9 Modifications to ITU-T Recommendation J.210 9 Annex A (informative): Bibliography.10 History 11 ETSI ETSI TS 102 639-3 V1.1.1 (2009-04) 4 Intellectual Property Rights IPRs essen
10、tial or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potential
11、ly Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out b
12、y ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committ
13、ee Access, Terminals, Transmission and Multiplexing (ATTM). The present document is part 3 of a multi-part deliverable covering Third Generation Transmission Systems for Interactive Cable Television Services - IP Cable modems. Full details of the entire series can be found in part 1 i.1. Introductio
14、n This European Standard (Cable DOCSIS 3.0 Network series) has been produced by ETSI Access, Terminals, Transmission and Multiplexing Technical Committee (ATTM), Cable Access Network sub-group. ETSI ETSI TS 102 639-3 V1.1.1 (2009-04) 5 1 Scope The present document provides physical layer requirement
15、s for Cable Modem Termination System (CMTS) transmitters in the Data-Over-Cable Systems Interface Specifications (DOCSIS) architecture. It defines the downstream interface specifications for: an edgeQAM (EQAM) device in a modular CMTS architecture; or an integrated CMTS It was developed for the bene
16、fit of the cable industry, including contributions by operators and vendors from, Europe, North America and other regions. The source material for this specification was provided by the ITU-T Recommendation J.210 3 for which the most recent version can be found at http:/www.itu.int/ITU-T/. There are
17、 differences in the cable spectrum planning practices adopted for different networks in the world. Therefore two definitions for physical layer technology are included, which have equal priority and are not required to be interoperable. One technology definition is based on the downstream multi-prog
18、ramme television distribution that is deployed using 8 MHz channelling. The second technology definition is based on a multi-programme television distribution using 6 MHz channel spacing. Both options have equal status. The choices of physical-layer technologies allow operators some flexibility with
19、in any frequency planning, EMC and safety requirements that are mandated for their area of operation. EXAMPLE: The 6 MHz downstream-based option might be deployable within an 8 MHz channel plan. It is the network operators choice of which technology definition to deploy. NOTE: The present document r
20、eferences both physical layer technologies and where there are parameter differences both are specified for both options: (i) 8 MHz channel spacing; and. (ii) 6 MHz channel spacing. All optional physical-layer technologies are required to be backwards compatible with the earlier versions of those op
21、tions defined in ES 201 488 i.2 and ES 202 488 i.3. Requirements for EMC and safety are outside the scope of the present document. EMC and safety standards for European applications are published by CENELEC. NOTE 1: Examples of such CENELEC product safety standards are EN 60950 i.4 and EN 50083-1 i.
22、5. NOTE 2: For CENELEC safety categories of interfaces, see EG 201 212 i.6. NOTE 3: Examples of such CENELEC product EMC standards are EN 50081-1 i.7, EN 50082-1 i.8 and EN 50083-2 i.9. ETSI ETSI TS 102 639-3 V1.1.1 (2009-04) 6 2 References References are either specific (identified by date of publi
23、cation and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. Non-specific reference may be made only to a complete document or a part thereof and only in the following cases: - if it is accepted that it will be possible to use all futu
24、re changes of the referenced document for the purposes of the referring document; - for informative references. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this cl
25、ause were valid at the time of publication ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are indispensable for the application of the present document. For dated references, only the edition cited applies. For non-specific references, the
26、 latest edition of the referenced document (including any amendments) applies. 1 ITU-T Recommendation J.83 (Annex C): “Digital multi-programme systems for television, sound and data services for cable distribution, Annex C: Digital multi-programme System C“. 2 ETSI ES 202 488-2: “Access and Terminal
27、s (AT); Second Generation Transmission Systems for Interactive Cable Television Services - IP Cable Modems; Part 2: Radio frequency interface specification“. 3 ITU-T Recommendation J.210: “Downstream RF Interface for Cable Modem Termination Systems“. 2.2 Informative references The following referenc
28、ed documents are not essential to the use of the present document but they assist the user with regard to a particular subject area. For non-specific references, the latest version of the referenced document (including any amendments) applies. i.2 ETSI ES 201 488: “Access and Terminals (AT); Data Ov
29、er Cable Systems; Part 1: General“. i.3 ETSI ES 202 488: “Access and Terminals (AT); Second Generation Transmission Systems for Interactive Cable Television Services - IP Cable Modems“. i.4 EN 60950: “Information technology equipment - Safety“. i.5 CENELEC EN 50083-1:1993: “Cable networks for televi
30、sion signals, sound signals and interactive services - Part 1: Safety requirements“. i.6 ETSI EG 201 212: “Electrical safety; Classification of interfaces for equipment to be connected to telecommunication networks“. i.7 BS EN 61000-6-3:2001:“Electromagnetic compatibility (EMC). Generic standards. E
31、mission standard for residential, commercial and light-industrial environments.“. i.8 BS EN 61000-6-4:2001: “Electromagnetic compatibility (EMC). Generic standards. Emission standard for industrial environments“. ETSI ETSI TS 102 639-3 V1.1.1 (2009-04) 7 i.9 EN 50083-2:2001: “Cabled distribution sys
32、tems for television and sound signals. Electromagnetic compatibility for equipment“. i.10 ETSI TS 102 639-1: Access and Terminals, Transmission and Multiplexing (ATTM); Third Generation Transmission Systems for Interactive Cable Television Services - IP Cable Modems; Part 1: General“. i.11 CEA-542-B
33、: “ Cable Television Channel Identification Plan“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: ceiling (ceil): ceiling function rounds a number up to the nearest integer or nearest multiple of significance NOTE:
34、 Use: Ceiling (number, significance). Cable Modem (CM): modulator-demodulator at subscriber locations intended for use in conveying data communications on a cable television system Customer Premises Equipment (CPE): equipment at the end users premises; may be provided by the service provider Carrier
35、-to-Noise Ratio (C/N or CNR): ratio of signal power to noise power in a defined measurement bandwidth. For digital modulation, CNR = Es/No, the energy-per symbol to noise-density ratio; the signal power is measured in the occupied bandwidth, and the noise power is normalized to the modulation-rate b
36、andwidth NOTE: For analog NTSC video modulation, the noise measurement bandwidth is 4 MHz. Decibels (dB): ratio of two power levels expressed mathematically as dB = 10log10(POUT/PIN) Decibel-Millivolt (dBmV): unit of RF power expressed in decibels relative to 1 millivolt over 75 , where dBmV = 20log
37、10(value in mV/1 mV) Decibel-Microvolt (dBV): unit of RF power expressed in decibels relative to 1 microvolt over 75 , where dBV = 20log10(value in V/1 V) Electronic Industries Alliance (EIA): voluntary body of manufacturers which, among other activities, prepares and publishes standards. EdgeQAM mo
38、dulator (EQAM): head end or hub device that receives packets of digital video or data NOTE: It re-packetizes the video or data into an MPEG transport stream and digitally modulates the digital transport stream onto a downstream RF carrier using quadrature amplitude modulation (QAM). Forward Error Co
39、rrection (FEC): class of methods for controlling errors in a communication system. FEC sends parity information with the data which can be used by the receiver to check and correct the data. Gigahertz (GHz): unit of frequency; 1 000 000 000 or 109 Hz Hertz (Hz): unit of frequency; formerly cycles pe
40、r second Harmonic Related Carriers (HRC): method of spacing channels on a cable television system with all carriers related to a common reference Hybrid Fiber/Coax System (HFC): broadband bidirectional shared-media transmission system using optical fiber trunks between the head-end and the fiber nod
41、es, and coaxial cable distribution from the fiber nodes to the customer locations Incremental Related Carriers (IRC): method of spacing NTSC television channels on a cable television system in which all channels are offset up 12,5 kHz with respect to the CEA-542-B i.12 standard channel plan except f
42、or channels 5 and 6 ETSI ETSI TS 102 639-3 V1.1.1 (2009-04) 8 kilohertz (kHz): unit of frequency; 1 000 or 103 Hz; formerly kilocycles per second Media Access Control (MAC): used to refer to the layer 2 element of the system which would include DOCSIS framing and signaling Megahertz (MHz): unit of f
43、requency; 1 000 000 or 106 Hz; formerly megacycles per second Modulation Error Ratio (MER): ratio of the average symbol power to average error power M/N: relationship of integer numbers M,N that represents the ratio of the downstream symbol clock rate to the DOCSIS master clock rate Multiple System
44、Operator (MSO): corporate entity that owns and/or operates more than one cable system. National Television Systems Committee (NTSC): committee which defined the analog, colour television, broadcast standards in North America NOTE: The standards television 525-line video format for North American tel
45、evision transmission is named after this committee. NGNA LLC: company formed by cable operators to define a next-generation network architecture for future cable industry market and business requirements Physical Media Dependent Sublayer (PMD): sublayer of the Physical layer which is concerned with
46、transmitting bits or groups of bits over particular types of transmission link between open systems and which entails electrical, mechanical and handshaking procedures QAM channel (QAM ch): analog RF channel that uses quadrature amplitude modulation (QAM) to convey information Quadrature Amplitude M
47、odulation (QAM): modulation technique in which an analog signals amplitude and phase vary to convey information, such as digital data Radio Frequency (RF): portion of the electromagnetic spectrum from a few kilohertz to just below the frequency of infrared light Radio Frequency Interface (RFI): term
48、 encompassing the downstream and the upstream radio frequency interfaces Root Mean Square (RMS): square root of the mean value squared a function Self-Aggregation: method used to compute the headend noise floor by summing measured noise from a single device over a specified output frequency range St
49、andard Channel Plan (STD): method of spacing NTSC television channels on a cable television system defined in CEA-542-B Upstream Channel Descriptor (UCD): MAC Management Message used to communicate the characteristics of the upstream physical layer to the cable modems Video on Demand (VoD): system that enables individuals to select and watch video content over a network through an interactive television system 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: CM
