1、 ETSI EN 302 878-3 V1.1.1 (2011-11) Access, Terminals, Transmission and Multiplexing (ATTM); Third Generation Transmission Systems for Interactive Cable Television Services - IP Cable Modems; Part 3: Downstream Radio Frequency Interface; DOCSIS 3.0 European Standard ETSI ETSI EN 302 878-3 V1.1.1 (20
2、11-11) 2Reference DEN/ATTM-003006-3 Keywords access, broadband, cable, data, IP, IPCable, 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 enregistre la Sous-Prf
3、ecture 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 contents between such v
4、ersions, 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 document may be subject t
5、o 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.org/chaircor/ETSI_sup
6、port.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 2011. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI lo
7、go are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit 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 EN 302 878-3 V1.
8、1.1 (2011-11) 3Contents Intellectual Property Rights 5g3Foreword . 5g31 Scope and purpose 6g31.1 Scope 6g31.2 Purpose of Document . 6g31.3 Use of References in the present document 7g31.4 Requirements 7g32 References 7g32.1 Normative references . 7g32.2 Informative references 8g33 Definitions and ab
9、breviations . 8g33.1 Definitions 8g33.2 Abbreviations . 10g34 Void 11g35 Functional Assumptions . 11g35.1 Broadband Access Network . 11g35.2 Equipment Assumptions . 11g35.2.1 Frequency Plan . 11g35.2.2 Compatibility with Other Services 11g35.2.3 Fault Isolation Impact on Other Users 12g35.3 Downstre
10、am Plant Assumptions . 12g35.3.1 Transmission Levels . 12g35.3.2 Frequency Inversion . 12g35.3.3 Analog and Digital Channel Line-up 12g35.3.4 Analog Protection Goal 12g36 Physical Media Dependent Sublayer Specification 13g36.1 Scope 13g36.2 EdgeQAM (EQAM) differences from CMTS 13g36.3 Downstream . 1
11、4g36.3.1 Downstream Protocol . 14g36.3.2 Spectrum Format 14g36.3.3 Scaleable Interleaving to Support Video and High-Speed Data Services . 14g36.3.4 Downstream Frequency Plan 15g36.3.5 DRFI Output Electrical . 15g36.3.5.1 CMTS or EQAM Output Electrical 16g36.3.5.1.1 Power per Channel CMTS or EQAM 17g
12、36.3.5.1.2 Independence of individual channel within the multiple channels on a single RF port . 18g36.3.5.1.3 Out-of-Band Noise and Spurious Requirements for CMTS or EQAM . 20g36.3.5.2 CMTS or EQAM Master Clock Jitter for Asynchronous Operation . 24g36.3.5.3 CMTS or EQAM Master Clock Jitter for Syn
13、chronous Operation . 25g36.3.5.4 CMTS or EQAM Master Clock Frequency Drift for Synchronous Operation 25g36.3.6 CMTS or EQAM Clock Generation . 25g36.3.6.1 CMTS Clock Generation . 25g36.3.6.2 EQAM Clock Generation 25g36.3.6.3 Downstream Symbol Rate . 25g36.3.7 Downstream Symbol Clock Jitter for Synch
14、ronous Operation . 26g36.3.8 Downstream Symbol Clock Drift for Synchronous Operation . 26g36.3.9 Timestamp Jitter . 26g37 Downstream Transmission Convergence Sublayer 27g37.1 Introduction 27g37.2 MPEG Packet Format . 27g37.3 MPEG Header for DOCSIS Data-Over-Cable . 27g37.4 MPEG Payload for DOCSIS Da
15、ta-Over-Cable 28g3ETSI ETSI EN 302 878-3 V1.1.1 (2011-11) 47.4.1 stuff_byte 28g37.4.2 pointer_field 28g37.5 Interaction with the MAC Sublayer . 28g37.6 Interaction with the Physical Layer 29g3Annex A (normative): Additions and Modifications for European Specification 30g3A.1 Scope and purpose 30g3A.
16、2 Void 30g3A.3 Terms and definitions . 30g3A.4 Acronyms and abbreviations 30g3A.5 Functional Assumptions . 30g3A.5.1 Broadband Access Network . 30g3A.5.2 Equipment Assumptions . 31g3A.5.2.1 Frequency Plan . 31g3A.5.2.2 Compatibility with Other Services 31g3A.5.2.3 Fault Isolation Impact on Other Use
17、rs 31g3A.5.3 Downstream Plant Assumptions . 31g3A.5.3.1 Transmission Levels . 31g3A.5.3.2 Frequency Inversion . 31g3A.5.3.3 Analog and Digital Channel Line-up 32g3A.5.3.4 Analog Protection Goal 32g3A.6 Physical Media Dependent Sublayer Specification 32g3A.6.1 Scope 32g3A.6.2 EdgeQAM (EQAM) differenc
18、es from CMTS 32g3A.6.3 Downstream . 32g3A.6.3.1 Downstream Protocol . 32g3A.6.3.2 Spectrum Format 32g3A.6.3.3 Scaleable Interleaving to Support Video and High-Speed Data Services . 32g3A.6.3.4 Downstream Frequency Plan 33g3A.6.3.5 DRFI Output Electrical . 33g3A.6.3.5.1 CMTS or EQAM Output Electrical
19、 33g3A.6.3.5.1.1 Output Electrical per RF Port 33g3A.6.3.5.1.2 Power per Channel CMTS or EQAM 34g3A.6.3.5.1.3 Independence of individual channel within the multiple channels on a single RF port . 35g3A.6.3.5.1.4 Out-of-Band Noise and Spurious Requirements for CMTS or EQAM . 37g3A.6.3.5.2 CMTS or EQA
20、M Master Clock Jitter for Asynchronous Operation . 41g3A.6.3.5.3 CMTS or EQAM Master Clock Jitter for Synchronous Operation . 41g3A.6.3.5.4 CMTS or EQAM Master Clock Frequency Drift for Synchronous Operation 41g3A.6.3.6 CMTS or EQAM Clock Generation . 42g3A.6.3.6.1 CMTS Clock Generation . 42g3A.6.3.
21、6.2 EQAM Clock Generation 42g3A.6.3.6.3 Downstream Symbol Rate . 42g3A.6.3.7 Downstream Symbol Clock Jitter for Synchronous Operation . 42g3A.6.3.8 Downstream Symbol Clock Drift for Synchronous Operation . 43g3A.6.3.9 Timestamp Jitter . 43g3A.7 Downstream Transmission Convergence Sublayer 43g3A.7.1
22、Introduction 43g3A.7.2 MPEG Packet Format . 43g3A.7.3 MPEG Header for DOCSIS Data-Over-Cable . 43g3A.7.4 MPEG Payload for DOCSIS Data-Over-Cable 43g3A.7.5 Interaction with the MAC Sublayer . 43g3A.7.6 Interaction with the Physical Layer 43g3Annex B (normative): DOCS-DRF-MIB . 44g3History 59g3ETSI ET
23、SI EN 302 878-3 V1.1.1 (2011-11) 5Intellectual Property Rights IPRs essential 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
24、SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially 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:/ipr.etsi.org). Pursuant to the ETSI IPR Policy, no inve
25、stigation, including IPR searches, has been carried out by 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 European Standa
26、rd (EN) has been produced by ETSI Technical Committee Access, Terminals, Transmission and Multiplexing (ATTM). The present document is part 3 of a multi-part deliverable. Full details of the entire series can be found in part 1 i.7. National transposition dates Date of adoption of this EN: 14 Novemb
27、er 2011 Date of latest announcement of this EN (doa): 29 February 2012 Date of latest publication of new National Standard or endorsement of this EN (dop/e): 31 August 2012 Date of withdrawal of any conflicting National Standard (dow): 31 August 2012 ETSI ETSI EN 302 878-3 V1.1.1 (2011-11) 61 Scope
28、and purpose 1.1 Scope The present document defines the RF characteristics required in the downstream transmitter(s) of DOCSIS 3.0 CMTSs and EQAMs, sufficiently enough to permit vendors to build devices that meet the needs of cable operators around the world. In addition to defining these requirement
29、s for a DOCSIS 3.0 device, the present document could also be applicable to other devices such as: an Edge QAM (EQAM) not being used for DOCSIS 3.0 services; or an integrated Cable Modem Termination System (CMTS) with multiple downstream channels per RF port previous to DOCSIS 3.0. There are differe
30、nces in the cable spectrum planning practices adopted for different networks in the world. Therefore two options for physical layer technology are included, which have equal priority and are not required to be interoperable. One technology option is based on the downstream multi-program television d
31、istribution that is deployed in North America using 6 MHz channelling. The other technology option is based on the corresponding European multi-program television distribution. Both options have the same status, notwithstanding that the document structure does not reflect this equal priority. The fi
32、rst of these options is defined in clauses 5, 6 and 7, whereas the second is defined by replacing the content of those clauses with the content of annex A. Correspondingly, 4 and 2 apply only to the first option, and EN 300 429 8 only to the second. Compliance with the present document requires comp
33、liance with the one or the other of these implementations, not with both. It is not required that equipment built to one option will interoperate with equipment built to the other. A DRFI-compliant device may be a single-channel only device, or it may be a multiple-channel device capable of generati
34、ng one or multiple downstream RF carriers simultaneously on one RF output port. An EQAM may be a module of a modular cable modem termination system (M-CMTS) and be used for delivering a high-speed data service or it may serve as a component of a digital video or Video-on-Demand (VoD) system, deliver
35、ing high quality digital video to subscribers. These specifications are crafted to enable an EQAM to be used without restriction in either or both service delivery scenarios simultaneously. “Simultaneous“ in the early deployments means that if a RF output port has multiple QAM channels, some channel
36、(s) may be delivering high-speed data while some other channel(s) may be delivering digital video. The present document enables future uses, wherein a single QAM channel may share bandwidth between high-speed data and digital video in the same MPEG transport stream. Conceptually, an EQAM will accept
37、 input via an Ethernet link, integrate the incoming data into an MPEG transport stream, modulate one of a plurality of RF carriers, per these specifications, and deliver the carrier to a single RF output connector shared in common with all modulators. Conceivably, a single EQAM RF channel could be u
38、sed for data and video simultaneously. The reason that an EQAM RF channel can be used for either is that both digital video and DOCSIS data downstream channels are based on ITU-T Recommendation J.83 4, annex B for cable networks in North America and EN 300 429 8 for cable networks deployed in Europe
39、. On downstream channels complying to ITU-T Recommendation J.83 4, annex B, typically, the only difference between an EQAM RF channel operating in a video mode and an EQAM RF channel operating in DOCSIS data mode is the interleaver depth (see clauses 6.3.1 and 6.3.3). DOCSIS data runs in a low laten
40、cy mode using a shallow interleaver depth at the cost of some burst protection. DOCSIS data can do this because if a transmission error occurs, the higher layer protocols will request re-transmission of the missing data. For video, the sequence of frames in the program is both time sensitive and ord
41、er sensitive and cannot be re-transmitted. For this reason, video uses a deeper interleaver depth to provide more extensive burst protection and deliver more of the program content without loss. The penalty video pays is in latency. The entire program content is delayed by a few milliseconds, typica
42、lly, and is invisible to the viewers of the program. The conflicting demands for interleaver depth are what prevent a single EQAM RF channel from being used optimally for video and DOCSIS data simultaneously. A traditional integrated CMTS, however, is used solely for DOCSIS data. 1.2 Purpose of Docu
43、ment The purpose of the present document is to define the RF characteristics required in the downstream transmitter(s) of CMTSs and EQAMs, sufficiently enough to permit vendors to build devices that meet the needs of cable operators around the world. ETSI ETSI EN 302 878-3 V1.1.1 (2011-11) 71.3 Use
44、of References in the present document The present document will not attempt to wholly replicate the normative references provided in the document. However, it will use extracted portions of said documents where it adds clarity to the present document. For fuller understanding of the present document
45、, the most recent versions of 4 annex B or EN 300 429 8, respectively, as well as ES 202 488-2 1 should be available for reference. 1.4 Requirements Throughout the present document, the words that are used to define the significance of particular requirements are capitalized. These words are: “MUST“
46、 This word means that the item is an absolute requirement of this specification. “MUST NOT“ This phrase means that the item is an absolute prohibition of this specification. “SHOULD“ This word means that there may exist valid reasons in particular circumstances to ignore this item, but the full impl
47、ications should be understood and the case carefully weighed before choosing a different course. “SHOULD NOT“ This phrase means that there may exist valid reasons in particular circumstances when the listed behaviour is acceptable or even useful, but the full implications should be understood and th
48、e case carefully weighed before implementing any behaviour described with this label. “MAY“ This word means that this item is truly optional. One vendor may choose to include the item because a particular marketplace requires it or because it enhances the product, for example; another vendor may omi
49、t the same item. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. 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 clause were valid at the time of publication ETSI c
