1、TR 1 O1 201 1.1.1 (1997-10) Technical Repon Digital Video Broadcasting (DVB); Interaction channel for Satellite Master Antenna TV (SMATV) distribution systems; Guidelines for versions based on satellite and coaxial sections COPYRIGHT European Telecommunications Standards InstituteLicensed by Informa
2、tion Handling Services - - STD-ETSI TR 101 201-ENGL 1997 9 3400655 0235937 166 9 2 Reference DTWJTC-OODVB-67 (b400ic.PDF) Keywords DVB, broadcasting, digital, video, MPEG, TV, SMATV, interaction ETSi Secretariat Postai address F-O6921 Sophia Antipolis Cedex - FRANCE Office address 650 Route des Luci
3、oles - Sophia Antipolis Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Valbonne - FRANCE Siret No 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) Na 7803/88 X.400 TR 101 201 V1.l.l (1997-10) c= fr; a=atlas; p=etsi; s=secretariat Internet secreta
4、riat etsi.fr http:/www.etsi.fr Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in ail media. 0 European Telecommunications Standards Institute 1997 0 European Broadcasting Union 1997. Ali
5、rights reserved. COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services3 TR 101 201 V1.l.l (1997-10) Contents Intellectual Property Rights 5 Foreword 5 Introduction 6 1 2 3 3.1 3.2 4 4.1 4.2 4.3 5 5.1 5.1.1 5.1.2 5.2 5.2.1 5.2.2 5.2.3 5.3 5.3.1 Scope 9 Ref
6、erences 9 Definitions and abbreviations 11 Definitions . 11 Abbreviations . 11 System architecture of narrow-band interaction channel . 1 3 Protocol stack model 13 System model . 14 Application of the reference model 15 IC for SMATV systems based on sateliite and coaxial sections . 17 Satellite sect
7、ion 18 Satellite multiple access technology and access control . 19 Antenna size and power amplifier 20 Coaxial section . 21 Spectrum allocation 22 FDMRDMA multiple access . 23 Bit rates and framing 24 Satellite-coax interface . 25 RS-232 serial interface . 25 5.3.1.1 Mechanical and electrical chara
8、cteristics 25 5.3.1.2 Framing . 26 5.3.1.3 Flow control mechanisms . 26 5.3.2 Alternative interfaces . 26 5.3.2.1 LAN based interfaces . 26 5.3.2.2 X.25 communications interfaces . 26 6 6.1 6.1.1 6.1.2 6.1.3 6.2 Implementation examples for the satellite section . 27 Asymmetric services scenario for
9、interactive broadcasting applications . 27 Example based on TDMA with fixed assig ment 27 Example based on CDMA with Slotted Aloha . 28 Performances, advantages and limitations of the two examples . 30 Scenario oriented towards Multimedia services . 30 Annex A (informative): A . 1 A.2 A . 3 Satellit
10、e link budget examples 31 16 kbit/s carriers; TDMA + fixed assignment access protocol 31 16 kbit/s carriers; CDMA + Slotted Aloha access protocol . 32 256 kbit/s carriers; TDMA + Slotted Aloha access protocol . 33 Annex B (informative): ETSI VSAT standards vs . DVB SMATV Interaction Channel . 34 B.l
11、 Safety . 34 B . 2 FW performance . 35 B . 3 Control and Monitoring Functions (CMF) . 36 B . 4 Analysis of specified parameters for several scenarios 36 B.4.1 Off-axis EIRP emission density 37 B.4.1.1 Scenario based on TDMA 37 B.4.1.2 Scenario based on CDMA 37 B.4.2 Antenna transmit gain pattern . 3
12、8 B.4.3 Transmit polarization discrimination 38 B.4.4 Receive polarization discrimination . 38 B.4.5 Antenna receive gain pattern 38 COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services STD.ETF.1 TR 101 201-ENGL 1997 W 3400855 0235939 T50 4 TR 101 201 V1
13、.l.l (1997-10) B.4.6 History . 40 Polarization angle capability 39 COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services5 TR 101 201 V1.1.1 (1997-10) Intellectual Property Rights PRs essential or potentially essential to the present document may have been
14、 declared to ETSI. The information pertaining to these essential PRs, if any, is publicly available for ETSI members and non-members , and can be found in ETR 314: “lnteliecrual Property Rights (1PRs); Essential, or potentially Essential, 1PRs notified to ETSl in respect of ETSI standards“, which is
15、 available free of charge from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/www.etsi.fi/ipr). Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other PR
16、s not referenced in ETR 314 (or the updates on http:/www.etsi.fr/ipr) which are, or may be, or may become, essential to the present document. Foreword This Technical Repon (TR) has been produced by the DVB Project and submitted for publication to the Joint Technical Committee (JTC) of the European B
17、roadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). The present document has been produced by the specialized group DVB-RC of the Technical Module of the DVB Project. An interest group, made-up by the Euro
18、pean Satellite Operators, has reviewed and agreed the text, based on the contributions made by the European DIGISAT project. The DIGISAT project is an European project of the ACTS Programme, paItially funded by the European Commission, atid with the sponsorship of the European Space Agency (ESA). Ad
19、vanced Communications, Technologies and Services (ACTS) is the European Commission Research and Development Programme. One of its projects is DIGISAT, which has contributed significantly to the solutions of Interaction Channel for SMATV networks, described in the present document. NOTE: The EBU/ETSI
20、 JTC was established in 1990 to co-ordinate the drafting of standards in the specific field of broadcasting and related fields. Since 1995 the JTC became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is responsible for the standardization of radio and televisi
21、on receivers. 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 ar
22、ea; its headquarters is in Geneva *. * European Broadcasting Union Case Postale 67 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 priv
23、ate sector organizations in the television industiy. 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 25 countries around the world, DVB fosters market-led systems, which meet the real needs,
24、and economic circumstances, of the consumer electronics and the broadcast industiy. COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services STD.ETSI TR 101 201-ENGL 1997 3400855 0235743 bu7 6 TR 101 201 V1.l.l (1997-10) Introduction The present document pro
25、vides guidelines and recommendations for the implementation of an Interaction Channel (IC) based on two way satellite links, to users connected to Satellite Master Antenna Television (SMATV) systems. The system provides the IC through the concatenation of a satellite section and a coaxial section (s
26、ee figure 1) in a seamless fashion. Guidelines and recommendations provided in the present document ae valid for the implementation of very cost effective solutions matched to the SMATV scenario as well as for the reuse of already operating satellite networks which are currently installed in a huge
27、amount of buildings throughout Europe. NIU : Network Interface Unit STU: Set Top Unit h;stE3IlBtc $cs.ti / a.:oax scCiii?r -/ - / 1 , Grouping Terminal Satellite Interactive Terminal at the Service Provider Ax BROADCASTER SEVICE PROVIDER SMATV NETWORK, I I Aa Figure 1: DVB Interaction Channel for SM
28、ATV System overview Research and Development activities carried out in the frame of the ACTS European Research Program have demonstrated the feasibility of the Interaction Channel for SMATV based on satellite and coaxial sections. Tests and demonstrations show that this concept is a short term reali
29、ty and that preliminary prototypes are available supported by the European industry. The present document describes the key points of the system to cope with the commercial requirements established at the DVB for asymmetric interactive services supporting broadcast to home with narrow-band return ch
30、annel DVB Project (A008) 8. The system described in the present document is an open system allowing the inter-operability between the two sections irrespective of the technology supported. Guidelines are provided in this sense, allowing the use of alternative technologies for each section (satellite
31、 and coaxial cable) with the aim the users or operators can select the technology best suited for each situation depending on the type of SMATV network, required services, quality of services, number of users, traffic requirements, etc. The SMATV coaxial section solutions described in the present do
32、cument allow also the use of alternative delivery media such as terrestrial, microwaves, etc., facilitating in this way inter-operable DVB-RC systems for the SMATV environment. The system described in the present document is compatible with the DVB network independent protocols for interactive servi
33、ces ETS 300 802 121. . COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services7 TR 101 201 V1.l.l (1997-10) The present document provides reference examples for the implementation of an interaction Channel system to cope with two different scenarios: Scenar
34、io A: An environment of asymmetric interactive services supporting broadcast to home with narrow-band return channel. It means the typical broadcasting scenario enhanced with low capacity interactive services, which implementation is foreseen to be massive in a short period of time. Provided that th
35、e power required for the Satellite interactive Terminals (SIT) within this scenario is rather low and considering that the use of very low cost terminals is required, the SIT becomes a differentiated concept from the typical Very Small Aperture satellite Terminal (VSAT) applications, currently worki
36、ng in the professional environment rather than in the consumer one, mainly because of the expected higher number of SIT. Scenario B: An environment oriented towards wide-band Multimedia services, where the satellite based infrastructure can play a very effective role. The generic DVB reference model
37、 for intemctive systems is followed by the system described in the present document. The Interaction Network is split into a satellite section, a coaxial section and an interface in-between. The satellite section provides the two ways communications between the roof of each building (Grouping Termin
38、al (GT) at the SMATV head-end) and the service provider premises. The coaxial section provides the two ways communications between each User Terminal (T) and the GT at the SMATV head-end which is located at the roof of each building. The Satellite Interactive Terminal (SIT) is the key equipment of t
39、he satellite section, which is composed by the RF antenna subsystem and the satellite modem to provide inter-activity to the SMATV users. One SIT would be needed per building although in some cases it might be convenient to collect the interaction traffic of several adjacent buildings into a single.
40、GT. For the satellite section, implementation examples are given for both identified scenarios and for different satellite network technologies such as Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA) with the aim of showing the feasibility to implement open and inter-op
41、erable systems based on existing standards. In order to provide purely illustrative implementation examples, specific sizing examples are provided for hypothetical services and traffic scenarios, deriving antenna sizes, power required, possible configurations, etc. The GT at the SMATV performs the c
42、ollection and the distribution of information coming from and going to the UTs. It is composed by the GT Interactive Network Adapter (INA), the Medium Access Control (MAC) functions and the interfaces with the SIT in order to collectldistribute the information in the SMATV coax network related to ea
43、ch WS Interactive Interface Module (IIM). For the coaxial section a subset of the options provided by the DVB-RC-CATV (ETS 300 800 9) is recommended allowing a system simpler than the CATV one, thus matching the requirements of the SMATV scenario. One of the key elements of the SMATV scenario with r
44、espect to the CATV one is that the GT at the SMATV head-end is an equipment of a consumer type in a similar way as the Set Top Box (STB) is, although the SMATV head-end cost is shared among the users connected to the same SMATV network. Although the system proposed for the coaxial section is applica
45、ble for an extended range of SMATV systems, very small SMATV systems with a reduced number of users might require alternative optimized coaxial section solutions. The interface between the coaxial and the satellite sections is defined with the aim of facilitating the interoperability between subsyst
46、ems from different vendors and technologies. In principle a very low cost interface, RS-232 based, is recommended although alternative interfaces are identified in order to allow the use of existing equipment as well as to facilitate the provision of Multimedia broadband applications as identified i
47、n the scenario B above. Due to the fact that the cost of the system is one of the major driving factors to ensure the commercial feasibility of Interaction Channel for SMATV, the system proposed takes advantage of the natural grouping of users in an SMATV system for sharing the cost of the SIT and t
48、he Grouping Terminal (GT) among the number of users living in the same building. The conclusion reached on the feasibility of the Interaction Channel for SMATV networks is also supported by the cost studies carried out to check the compliance against the DVB Projects Interactive Services Commercial
49、Module (ISCM) user requirements. Information on the key parameters of the existing ETSI standards on VSAT applicable to the SIT for the SMATV networks, are provided in order to check their adaptation to this scenario where profiles of consumer terminals should be reached, as well as to identify any potential action in the corresponding standardization bodies. COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services8 TR 101 201 V1.l.l (1997-10) Alternative DVB Interaction Channel (IC) systems may be also
