1、UROPEAN IC I ELECOMMUNICATION STANDARD ETS 300 800 July 1998 Source: EBU/CENELEC/ETSI-JTC Reference: DE/JTC-DVB-23 ICs: 33.020 Key words: DVB, broadcasting, digital, video, cable, TV, interaction European Broadcasting Unio Union Europenne de Radio-Tlvision Digital Video Broadcasting (DVB); Interacti
2、on channel for Cable TV distribution systems (CATV) ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE Internet: secretariat et.Si.fr - httpd/www.e
3、tsi.fr - http:/www.etsi.org Tel.: 43 4 92 94 42 O0 - Fax: 43 4 93 65 47 16 Copyright Notiflcatlon: No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute
4、1998. O European Broadcasting Union 1998. All rights resewed. STD-ETSI ETS 300 BOO-ENGL 1778 = 3400855 0335022 671 Page 2 ETS 300 800: July 1998 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have
5、 comments concerning its accuracy, please write to “ETSI Standards Making Support Dept.“ at the address shown on the title page. STD-ETSI ETS 300 800-ENGL 1998 U 3400855 0335023 508 W Page 3 ETS 300 800 July 1998 Contents Foreword . 5 1 Scope 7 2 Normative references 7 3 Abbreviations . 7 4 Referenc
6、e model . 8 Protocol stack model . 8 4.2 System model 9 4.1 5 DVB interaction channel specification for CATV networks 11 5.1 5.2 5.3 5.4 5.5 System concept . 11 5.1.2 Spectrum allocation . 11 5.1.1 Out-Of-Band (008) / In-Band (IB) principle 11 5.1.3 FDMnDMA multiple access 12 5.1.4 Bit rates and fra
7、ming . 13 Lower physical layer specification 13 5.2.1 Forward Interaction path (Downstream OOB) . 15 5.2.1.1 Frequency range (Downstream 008) . 15 5.2.1.2 Modulation and mapping (Downstream OOB) . 15 5.2.1.3 Shaping filter (Downstream OOB) . 16 5.2.1.4 Randomizer (Downstream OOB) . 18 5.2.1.5 Bit ra
8、te (Downstream OOB) . 18 5.2.1.6 Receiver power level (Downstream OOB) . 18 5.2.1.7 Summary (Downstream OOB) . 19 5.2.1.8 Bit error rate downstream OOB (informative) 20 Forward Interaction Path (Downstream IB) . 20 Return Interaction Path (Upstream) 20 5.2.3.1 Frequency range (Upstream) 20 5.2.3.2 M
9、odulation and mapping (Upstream) 20 5.2.3.3 Shaping filter (Upstream) . 21 5.2.3.4 Randomizer (Upstream) 22 5.2.3.5 Bit rate (Upstream) 22 5.2.3.6 Transmit power level (Upstream) 23 5.2.3.7 Carrier suppression when idle (Upstream) 23 5.2.3.8 Summary (Upstream) 24 5.2.3.9 Packet loss upstream (inform
10、ative) . 25 Forward Interaction path (Downstream OOB) . 26 5.3.1.1 Signalling Link Extended SuperFrame (SL-ESF) framing format 26 5.3.1.2 Frame overhead 26 Forward Interaction path (Downstream IB) . 34 Return Interaction Path (Upstream) 36 5.3.3.1 Slot Format 36 5.2.2 5.2.3 Framing 26 5.3.1 5.3.1.3
11、Payload structure . 27 5.3.2 5.3.3 Slot timing assignment . 38 5.4.1 5.4.2 5.4.3 Downstream slot position reference (Downstream 008) . 38 Downstream slot position reference (Downstream IB) 39 Upstream slot positions . 40 5.4.3.1 Rate 256 kbitls . 41 5.4.3.2 Rate 1, 544 MbiVs . 41 5.4.3.3 Rate 3. 088
12、 MbiVs . 42 Slot position counter 43 5.4.4 MAC functionality . 44 Page 4 ETS 300 800 July 1998 5.5.1 MAC reference model . 44 5.5.2 MAC concept 45 5.5.2.1 Relationship between higher layers and MAC protocol 45 5.5.2.2 Relationship between physical layer and MAC protocol . 45 5.5.2.3 Relationship bet
13、ween physical layer slot position counter and MAC slot assignment . 46 5.5.2.4 Access modes (Contention / Ranging / Fixed rate / Reservation) 46 5.5.2.5 MAC error handling procedures 48 5.5.2.6 MAC messages . 48 MAC initialization and provisioning . 52 5.5.3.1 Provisioning Channel Message (Broadcast
14、 006 Downstream) . 53 5.5.3.2 Default Configuration Message (Broadcast Downstream) Sign-On and Calibration . 56 5.5.4.1 Sign-On Request Message (Broadcast Downstream) . 59 5.5.4.2 Sign-On Response Message (Upstream Contention or Ranging) . 60 5.5.4.3 Ranging and Power Calibration Message (Singlecast
15、 Downstream) 60 5.5.4.4 Ranging and Power Calibration Response Message (Upstream reserved or contention Ranging) . 61 5.5.4.5 Initialization Complete Message (Singlecast Downstream) . 61 Default Connection Establishment 61 5.5.5.1 Connect Message (Singlecast Downstream) . 63 5.5.5.2 Connect Response
16、 (Upstream contention, reserved or contention access) . 66 5.5.5.3 Connect Confirm (Singlecast Downstream) 67 5.5.6 Data connections 67 5.5.6.1 Fixed rate access 68 5.5.6.2 Contention based access 68 5.5.6.3 Reservation access . 69 MAC link management . 72 5.5.7.1 Power and timing management 73 5.5.
17、7.2 TDMA allocation management 73 5.5.7.3 5.5.7.4 Link management messages 76 5.5.3 5.5.4 5.5.5 5.5.7 Channel error management 76 Annex A (informative): Bibliography . 82 History . 83 STD-ETSI ETS 300 800-ENGL I1778 = 3400855 0335025 380 Page 5 ETS 300 800 July 1998 Foreword This European Telecommun
18、ication Standard (ETS) has been produced by the Joint Technical Committee (JTC) Broadcast of the European Broadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). NOTE: The EBU/ETSI JTC Broadcast was establish
19、ed in 1990 to co-ordinate the drafting of ETSs in the specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is responsible for the standardization of radio and television receivers.
20、 The EBU is a professional association of broadcasting organizations whose work includes the co-ordination of its members activities in the technical, legal, programme-making and programme-exchange domains. The EBU has active members in about 60 countries in the European broadcasting area; its headq
21、uarters is in Geneva. European Broadcasting Union CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 Digital Video Broadcasting (DVB) Project Founded in September 1993, the DVB Project is a market-led consortium of public and private sector organizations in the t
22、elevision industry. Its aim is to establish the framework for the introduction of MPEG-2 based digital television services. Now comprising over 200 organizations from more than 25countries around the world, DVB fosters market-led systems, which meet the real needs, and economic circumstances, of the
23、 consumer electronics and the broadcast industry. Transposition dates Date of adoption of this ETS: Date of latest announcement of this ETS (doa): 20 March 1998 31 October 1998 Date of latest publication of new National Standard or endorsement of this ETS (dop/e): 30 April 1999 I Date of withdrawal
24、of any conflicting National Standard (dow): 30 April 1999 I STD-ETSI ETS 300 800-ENGL 1998 D 3400855 031502b 217 D Page 7 ETS 300 800 July 1998 1 Scope This ETS is the baseline specification for the provision of interaction channel for Cable TV (CATV) networks. It is not intended to specify a return
25、 channel solution associated to each broadcast system because the inter-operability of different delivery media to transport the return channel is desirable. The solutions provided in this ETS for interaction channel for CATV networks are a pari of a wider set of alternatives to implement interactiv
26、e services for DVB systems. 2 Normative references This ETS incorporates by dated and undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendmen
27、ts to or revisions of any of these publications apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 50083-2: Cabled Distribution Systems for television and sound signals“. EN 300 429: “Digital V
28、ideo Broadcasting (DVB); Framing structure, channel coding and modulation for cable systems“. EN 300 421: “Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for 11/12 GHz satellite services“. ITU Recommendation 1.361 (1 1/95): “B-ISDN ATM layer specification. ITU-T R
29、ecommendation 1.363: “B-ISDN ATM Adaptation Layer specification“. EN 300 468: Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems“. Abbreviations For the purposes of this ETS, the following abbreviations apply: ATM BC BRA CATV CRC DAVIC DVB EMC ESF FAS FDM FEC
30、 IB IC INA IQ IRD ISDN LFSR LSB MAC MMDS MPEG MSB Asynchronous Transfer Mode Broadcast Channel Basic Rate Access Community Antenna TeleVision / Cable TV Cyclic Redundancy Check Digital AudioVlsual Council Digital Video Broadcasting ElectroMagnetic Compatibility Extended SuperFrame Frame Alignment Si
31、gnal Frequency Division Multiplex Forward Error Correction In-Band Interaction Channel Interactive Network Adapter In-phase and Quadrature components Integrated Receiver Decoder Integrated Services Digital Network Linear Feedback Shift Register Least Significant Bit Media Access Control Multi-channe
32、l Multi-point Distribution System Motion Picture Expert Group Most Significant Bit Previous page is blank STD.ETS1 ETS 300 800-ENGL 3998 3400855 0335027 353 Page 8 ETS 300 800: July 1998 NIU NSAP 006 os1 PM PSK PSTN QAM QoS QPSK RMS SMATV SNR STB STU TDMA TS vc I VP I SL-ESF Network Interface Unit N
33、eiwork Service Access Point Out Of Band Open Systems Interconnection Pulse Modulation Phase Shift Keying Public Switched Telephone Network Quadrature Amplitude Modulation Quality of Service Quaternary PSK Root Mean Square Signalling Link Extended Superframe Satellite Master Antenna Tele-Vision Signa
34、l to Noise power Ratio Set Top Box Set Top Unit Time Division Multiple Access Transport Stream Virtual Channel Identifier Virtual Path Identifier 4 Reference model This clause presents the reference model for system architecture of narrowband interaction channels in a broadcasting scenario (asymmetr
35、ic interactive services). 4.1 Protocol stack model For asymmetric interactive services supporting broadcast to the home with narrowband return channel, a simple communications model consists of the following layers: Physical layer: Where all the physical (electrical) transmission parameters are defi
36、ned. Transport layer: Defines all the relevant data structures and communication protocols like data containers, etc. Application layer: Is the interactive application software and runtime environments (e.g. home shopping application, script interpreter, etc.). This ETS addresses the lower two layer
37、s (the physical and transport) leaving the application layer open to competitive market forces. A simplified model of the OS1 layers was adopted to facilitate the production of specifications for these nodes. Figure 1 points out the lower layers of the simplified model and identifies some of the key
38、 parameters for the lower two layers. Following the user requirements for interactive services, no attempt will be made to consider higher layers in this ETS. STD-ETSI ETS 300 BOO-ENGL 1998 3Y00855 0335028 09T Page 9 ETS 300 800: July 1998 Layer Structure for Genetic System Reference Model , . . . .
39、 . . . . . . . . . . . I. I . . . . . . . . . . . . . . . i Proprietary j i layers I t I Higher medium I I layers ; Network Independent I i Protocols I.- - ! Access mechanism Packet structure Modulation Channel coding Freq. range Filtering Equalisation (Network Dependent Protocols) Figure 1 : Layer
40、structure for generic system reference model This ETS addresses the CATV network specific aspects only. The network independent protocols are specified separately (ITU-T Recommendation 1.361 4). 4.2 System model Figure 2 shows the system model which is to be used within DVB for interactive services.
41、 In the system model, two channels are established between the service provider and the user: - Broadcast Channel (BC): A uni-directional broadband BC including video, audio and data. The BC is established from the service provider to the users. It may include the Forward Interaction path. - Interac
42、tion Channel (IC): A bi-directional IC is established between the service provider and the user for interaction purposes. It is formed by: - Return Interaction path: From the user to the service provider. It is used to make requests to the service provider or to answer questions. It is a narrowband
43、channel. Also commonly known as return channel. - Forward Interaction path : From the service provider to the user. It is used to provide some sort of information by the service provider to the user and any other required communication for the interactive service provision. It may be embedded into t
44、he broadcast channel. It is possible that this channel is not required in some simple implementations which make use of the BC for the carriage of data to the user. The user terminal is formed by the Network Interface Unit (NIU) and the Set Top Unit (STU). The NIU consists of the Broadcast Interface
45、 Module (BIM) and the Interactive Interface Module (IIM). The user terminal provides interface for both broadcast and interaction channels. The interface between the user terminal and the interaction network is via the IIM. -1 at .1 h O O m v) c W t W . u) c G 2 .- J u) c o c C .- r - al D E o ?! ?!
46、 E c al r al cn A fn o c al o) c .- 5 a hl f o) i Page 11 ETS 300 800: July 1998 5 DVB interaction channel specification for CAN networks The CATV infrastructures can support the implementation of the return channel for interactive services suitable for DVB broadcasting systems. CATV can be used to
47、implement interactive services in the DVB environment, providing a bi-directional communication path between the user terminal and the service provider. 5.1 System concept The interactive system is composed of Forward Interaction path (downstream) and Return Interaction path (upstream). The general
48、concept is to use downstream transmission from the INA to the NIUs to provide synchronization and information to all NIUs. This allows the NIUs to adapt to the network and send synchronized information upstream. Upstream transmission is divided into time slots which can be used by different users, u
49、sing the technique of Time Division Multiple Access (TDMA). One downstream channel is used to synchronize up to 8 upstream channels, which are all divided into time slots. A counter at the INA is sent periodically to the NIUs, so that all NIUs work with the same clock. This gives the opportunity to the INA to assign time slots to different users. Three major access modes are provided with this system. The first one is based on contention access, which lets users send information at any time with the risk to have a collision with other
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