1、STD-ETSI ETS 300 8DL-ENGL L997 6 3400855 0227372 77b 6 I STANDARD ETS 300 801 August 1997 Source: EBU/CENELEC/ETSI JTC Reference: DHJTC-OODVB-24 ICs: 33.020 Key words: DVB, broadcasting, digital, video, TV, interaction, PSTN, ISDN European Broadcasting Uni nion Europenne de Radio-Tlvision Diq:LSii v
2、ideo Brixdmtinq Digital Video Broadcasting (DVB); Interaction channel through Public Switched Telecommunications Network (PSTN) 1 Integrated Services Digital Networks (ISDN) ETS I European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE
3、 Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat Qetsi.fr Tel.: +33 4 92 94 42 O0 - Fax: +33 4 93 65 47 16 Copyright Notification: No part may be reproduced except as authorized by written permission. T
4、he copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 1997. O European Broadcasting Union 1997. All rights reserved. STD-ETSI ETS 300 801-ENGL 1997 3400855 0227373 b22 D Page 2 ETC 300 801 : August 1997 Whilst every care has
5、 been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Editing and Committee Support Dept.“ at the address shown on the title page. STD-ETSI ETS 300 801-ENGL 1777 3
6、q00855 0227374 5b9 Page 3 ETS 300 801: August 1997 Contents Foreword . 5 Scope . 7 Normative references. ._._. 7 Abbreviations _._ 7 System architecture of narrow-band Interaction Channels (IC) 8 4.1 Protocol stack model . 4.2 System model 9 DVB Interaction Channel (IC) for PSTN . 11 5.1 Physical in
7、terfaces between the modem. the user terminal and PSTN . 11 5.1.1 External modem 11 5.1.2 Integrated modem . 11 5.2.1 Dialling . 11 Call attempt when service provider line is busy . 11 Forced disconnection during dialling or data transfer 12 5.2 Calling procedures 11 5.2.2 Line monitoring 11 5.3 5.4
8、 DVB Interaction Channel (IC) for ISDN 12 6.1 6.2 6.3 Forced disconnection 12 Physical interface for connection to ISDN BRA . 12 Calling procedures . . 12 Annex A (informative): Bibliography . 13 History . 14 STD-ETSI ETS 300 801-ENGL 1777 3400855 0227175 4T5 Page 5 ETC 300 801 : August 1997 Forewor
9、d This European Telecommunication Standard (ETS) has been produced by the Joint Technical Committee (JTC) of the European Broadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). NOTE: The EBUIETSI JTC was est
10、ablished 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 television receivers
11、. 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 head
12、quarters is in Geneva *. European Broadcasting Union Case Postale 67 CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: +41 22 71 7 21 11 Fax: +41 22 717 24 81 Digital Vldeo Broadcasting (DVB) Project Founded in September 1993, the DVB Project is a market-led consortium of public and private sector or
13、ganizations in the television industry. Its aim is to establish the framework for the introduction of MPEGP 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, and economic c
14、ircumstances, of the consumer electronics and the broadcast industry. Transposition dates Date of adoption: Date of latest announcement of this ETS (doa): 8 August 1997 30 Novern ber 1997 Date of latest publication of new National Standard or endorsement of this ETS (dop/e): 31 May 1998 Date of with
15、drawal of any conflicting National Standard (dow: 31 May 1998 I Previous page is blank - - STD-ETSI ETS 300 BOL-ENGL 1997 3q00855 022917b 331 W Page 7 ETS 300 801 : August 1997 1 Scope This European Telecommunication Standard (ETS) is the baseline specification for the provision of Return Channel (R
16、C) based on PSTN and ISDN to Digital Video Broadcasting (DVB) systems. It is not intended to specify a RC solution associated to each broadcast system because the inter-operability of different delivery media to transport the RC is desirable. Therefore the PSTN/ISDN solutions for the RC apply to sat
17、ellite, cable, SMATV, terrestrial, MMDS or any future DVB system. The solutions here provided for RC through PSTNASDN are a part of a wider set of alternatives to implement interactive services for DVB systems. 2 Normative references For the purposes of this ETS, the following references apply: ETS
18、300 O01 : “Attachments to the Public Switched Telephone Network (PSTN); General technical requirements for equipment connected to an analogue subscriber interface in the PSTN“. ETS 300 011: “Integrated Services Digital Network (ISDN): Primary rate user- network interface Layer 1 specification and te
19、st principles“. ETS 300 012: “Integrated Services Digital Network (ISDN): Basic rate user- network interface Layer 1 specification and test principles“. ETS 300 402 (1994): “ISDN user-network interface - Data link layer specification“. ITU-T Recommendation Q.921 Rev. 1 . ETS 300 403 (1994): “Digital
20、 subscriber Signalling System No. 1 (DSS 1) - ISDN user-network interface layer 3 specification for basic call control“. ITU-T Recommendation (2.931 Rev. 1. ITU-T Recommendations V.21, V.22, V.22bis, V.23, V.25, V.32, V.32bis, V.34 and V.42. Official Journal of the European Communities, No. L 128, 2
21、3 May 1991: “Council Directive on the approximation of the laws of the Member States concerning telecommunications terminal equipment, including the mutual recognition of their conformity (91/263/EEC)“. BI EN 50201: “Interface for DVB-IRD“. 91 ETS 300 802: “Digital Video Broadcasting (DVB); Network
22、independent protocols for interactive services“. 3 Abbreviations For the purposes of this ETS, the following abbreviations apply: BC BIM BRA DAVI C DCE DTE DTMF DVB GSTN IC IIM I RD Broadcast Channel Broadcast Interface Module Basic Rate Access Digital Audio Vlsual Council Data Communication Equipme
23、nt Data Termination Equipment Dual-Tone Multi-Frequency (dialling mode) Digital Video Broadcasting General Switched Telephone Network Interaction Channel Interactive Interface Module Integrated Receiver Decoder Previous page is blank STDmETSI ETS 300 801-ENGL 1777 W 3400855 0227377 278 W Page 8 ETS
24、300 801 : August 1997 ISDN ISDN BRA MMDS MPEG NCCD NIU os I PSTN RC SMATV STB STU Integrated Services Digital Network ISDN Basic Rate Access Microwave Multi-point Distribution System ISO/IEC Moving Pictures Experts Group Network Congestion Control Descriptor Network Interface Unit Open Systems Inter
25、connection Public Switched Telephone Network Return Channel Satellite Master Antenna TeleVision Set Top Box Set Top Unit 4 System architecture of narrow-band Interaction Channels (IC) This clause provides a reference model for system architecture of narrow-band IC in a broadcasting scenario (asymmet
26、ric interactive services). 4.1 Protocol stack model For asymmetric interactive services supporting broadcast to the home with narrowband RC, a simple communications model consists of the following layers: physical layer: Where all the physical (electrical) transmission parameters are defined. transp
27、ort 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.9. home shopping application, script interpreter, etc.). This ETS addresses the lower two layers (the phys
28、ical and transport) leaving the application layer open to competitive market forces. It is not the role of the DVB to define a standardized application layer. A simplified model of the OS1 layers was adopted to facilitate the production of specifications for these nodes. Figure 1 points out the lowe
29、r layers of the simplified model and identifies some of the key 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. Layer Structure for Generic System Reference Model . . . . . . . . . . . . . .
30、 . . . . . . . . . . . . . . . . . . . . . . i Proprietary i layers I Higher medium ! layers Access mechanism Packet structure Network Independent Protocols (Network Dependent 1 Protocols) Modulation I Channel coding Freq. range Filtering Equalisation Power Figure 1: Layer structure for generic syst
31、em reference model STD-ETSI ETS 300 801-ENGL 1997 M 3400855 0229378 104 W Page 9 ETS 300 801 : August 1997 This specification addresses the PSTNASDN network specific aspects only. The network independent protocols will be specified separately in ETS 300 802 191. 4.2 System model Figure 2 shows the s
32、ystem model which is to be used within DVB for interactive services. In the system model, two channels are established between the user and the service provider: - Broadcast Channel (BC) : A unidirectional broadband BC including video, audio and data. BC is established from the service provider to t
33、he user. It may include the Forward Interaction path. - Interaction Channel (IC): A bi-directional IC is established between the user and the service provider for interaction purposes. It is formed by: - Return Interaction path : from the user to the service provider. It is a narrow band channel use
34、d to make requests to the service provider or to answer questions. Also commonly known as Return Channel (RC). - Forward Interactlon path: (forward channel): from the service provider to the user is used to provide some sort of information by the service provider to the user and any other required c
35、ommunication for the interactive service provision. It may be embedded into the BC. 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 Set Top Unit (STU) and the Network Int
36、erface Unit (NIU). The NIU consisting of the Broadcast Interface 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. The interfac
37、e between the broadcast channels and the user terminal is via the BIM. STD-ETSI ETS 300 801-ENGL 1797 W 31100855 0227379 O110 c. c a, U c a, Q a, U C .- L 2 - c a, U r a, Q a, U L 2 a, c STD-ETSI ETS 300 BOL-ENGL 3777 3400855 0229380 8b2 Page 11 ETC 300 801 : August 1997 5 DVB Interaction Channel (I
38、C) for PSTN The PSTN infrastructures can support the implementation of the RC for interactive services suitable for DVB systems. PSTN can be used to implement interactive services in the DVB environment, providing a bi-directional communication path between the user terminal and the service provider
39、 by means of a modem. In order to allow the access to the PSTN, the user terminal shall be provided with a modem (internal or external to the user terminal). The modem constitutes the user Interface Module to the interaction net work. The modem will be connected to the PSTN through the existing tele
40、phone line. Therefore it will share the line with other terminals/equipment already present at the customer premises (telephones, facsimile, other modems, etc.). The interface between modem and PSTN shall be compliant with the national requirements for the terminal equipment as reported in ETS 300 O
41、01 l. 5.1 Physical interfaces between the modem, the user terminal and PSTN The physical interfaces between the modem, the user terminal and PSTN are described in this subclause. It applies to user terminals with internal or external modem. 5.1.1 External modem The external modem shall support the i
42、nterfaces requirements between the user Terminal (Data Termination Equipment) and the modem (Data Communication Equipment) as described in EN 50201 8. The external modem shall support the PSTN link interface as described in EN 50201 8. 5.1.2 integrated modem The internal modem shall meet the same re
43、quirements as the external modem. 5.2 Calling procedures The connection to PSTN shall be established according to the rules specified in ETS 300 O01 l, with reference to the specific national requirements. 5.2.1 Dial ling The modem will use DTMF (Dual-Tone Multi-Frequency) dialling mode according to
44、 ETS 300 O01 l. Optionally pulse dialling mode can be used according to ETS 300 001 l. 5.2.2 Line monitoring The modem shall be able to identify the status of the line (“on-hook“ status or “off-hook“ status). When the line is engaged (“off-hook“ status) the modem shall perform a call repetition proc
45、edure according to the distribution specified in ETS 300 O01 l. Also, the call repetition process shall optionally be controlled by a procedure. 5.3 Call attempt when service provider line is busy The modem will execute multiple call attempts in response of “busy line“ signal from the service provid
46、er. If these call attempts are addressed to the same service provider number, they shall be distributed in time according to ETS 300 O01 l. Also, the call repetition process shall optionally be controlled by the application layer using a Network Congestion Control Descriptor (NCCD) (see ETS 300 802
47、9). STD-ETSI ETS 300 801-ENGL 1997 m 3400855 U22918L 7T7 Page 12 ETS 300 801 : August 1997 5.4 Forced disconnection during dialling or data transfer The content of this subclause is necessary only for those European countries where the users capability to interrupt an active communication at any tim
48、e is not provided by the PSTN. In this case the capability of interrupting an active communication shall be provided cutting off the connection by the calling device. It is recognized that in some European countries it shall be guaranteed that the user can interrupt the communication at any time. Du
49、ring dialling or data transfer phases, the modem connection shall be cut-off and the modem shall perform a forced disconnection if the user hooks off any of the other terminals connected to the same line. This functionality is requested in order to enable emergency calls. The modem shall be able to Set-up the connection when requested from the user terminal. If it is not possible for the modem to interrupt the interaction when it is the called party, the modem itself shall not accept incoming calls from any service provider (auto-answering f
