SIST ETS 300 801 E1:2003

• Abstract:

  This ETS is the baseline specification for the provision of return channel based on PSTN and ISDN to DVB Systems. It is noted that the DVB does not intend to specify a return channel solution associated to each broadcast system because the interoperability of different delivery media to transport the return channel is desirable. Therefore the PSTN/ISDN solutions for the return channel apply to satellite, cable, SMATV, terrestrial, MMDS or any future DVB broadcasting system. The solutions here provided for return channel through PSTN/ISDN are a part of a wider set of alternatives to implement interactive services for DVB broadcasting systems.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.040.35 - Telephone networks
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• ICS: 33.170 - Television and radio broadcasting
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 801 ed.1 (1997-08) - Digital Video Broadcasting (DVB); Interaction channel through Public Switched Telecommunications Network (PSTN)/ Integrated Services Digital Networks (ISDN)

SIST ETS 300 801 E1:2003 is the Slovenian adoption of ETS 300 801 Edition 1 from the DVB/ETSI broadcast standards family. It specifies how a Digital Video Broadcasting (DVB) return channel can be provided over the Public Switched Telecommunications Network (PSTN) and Integrated Services Digital Networks (ISDN) for interactive services.

What does SIST ETS 300 801 E1:2003 specify?

SIST ETS 300 801 E1:2003 specifies the baseline Return Channel (RC) arrangements for DVB systems using PSTN and ISDN. It is written so the same return-channel approach can be used with satellite, cable, SMATV, terrestrial, MMDS, or future DVB systems.

The document focuses on the network-specific parts of the interaction channel. It leaves the application layer open and points network-independent protocols to ETS 300 802.

The standard is organized into:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Abbreviations
• Clause 4 - System architecture of narrow-band Interaction Channels (IC)
• Clause 5 - DVB Interaction Channel (IC) for PSTN
• Clause 6 - DVB Interaction Channel (IC) for ISDN
• Annex A - Bibliography

What are the key requirements of SIST ETS 300 801 E1:2003?

SIST ETS 300 801 E1:2003 defines how the lower layers of the DVB interaction path are arranged, how terminals connect to PSTN or ISDN, and how calls are set up and cleared. In practice, this tells implementers what the modem, terminal, and network interface have to support so the return channel can work across different DVB delivery systems.

Architecture and division of functions

Clause 4 describes a narrow-band IC reference model with physical, transport, and application layers. The standard covers the physical and transport parts only, which matters because equipment vendors must implement the network-facing functions while interactive applications remain separate.

Clause 4 also describes the DVB system model with a Broadcast Channel (BC) and a bidirectional IC made of a Return Interaction path and a Forward Interaction path. That distinction matters because the return path carries user requests, while the forward path carries information back to the user and may be embedded in the BC.

PSTN return channel

Clause 5 allows the RC to be implemented over PSTN through a modem, either internal or external to the user terminal. The modem becomes the user interface to the interaction network, so terminal designers must provide the modem function and the PSTN connection.

For external modems, Clause 5 points to EN 50201 for the interface between the Data Termination Equipment (DTE) and the Data Communication Equipment (DCE), and for the PSTN link interface. This matters because it anchors the modem connection to a defined equipment interface.

Clause 5.2 requires calling according to ETS 300 001, using Dual-Tone Multi-Frequency (DTMF) dialling and optionally pulse dialling. It also requires line-status recognition, including on-hook and off-hook states, and call repetition when the line is engaged.

Clause 5.3 covers repeated call attempts when the service provider line is busy. Repeated attempts to the same number are to be distributed in time according to ETS 300 001, and they may also be controlled by the application layer using a Network Congestion Control Descriptor (NCCD).

Clause 5.4 addresses forced disconnection during dialling or data transfer where local rules require the user to be able to interrupt an active call. The modem may need to cut off the connection if another telephone on the same line is lifted, and if interruption cannot be guaranteed when the modem is the called party, auto-answering is disabled.

ISDN return channel

Clause 6 allows the RC to be implemented over ISDN, using ISDN Basic Rate Access (BRA). The physical interface is taken from ETS 300 012, and the signalling follows ETS 300 402 and ETS 300 403.

Clause 6.3 states that emergency-call disconnection can be implemented by upper-layer protocols using the signalling channel, the D channel. For implementers, this means emergency handling is part of the call-control design, not just the physical link.

What terms does SIST ETS 300 801 E1:2003 define?

• Broadcast Channel (BC) - The one-way broadband path from the service provider to the user, carrying video, audio, and data.
• Interaction Channel (IC) - The bidirectional channel used for interactive services between the user and the service provider.
• Return Channel (RC) - The user-to-provider part of the IC, used for requests and responses.
• Return Interaction path - The narrow-band path from the user to the service provider within the IC.
• Forward Interaction path - The provider-to-user path within the IC, used for interactive information and related communication.
• Set Top Unit (STU) - The user-terminal unit identified in the system model as part of the DVB reception and interaction setup.
• Network Interface Unit (NIU) - The terminal-side unit made up of the Broadcast Interface Module (BIM) and the Interactive Interface Module (IIM).
• Dual-Tone Multi-Frequency (DTMF) - The dialling mode used for PSTN access in this standard.

Who uses SIST ETS 300 801 E1:2003?

SIST ETS 300 801 E1:2003 is used by organizations designing or supplying DVB interactive systems that rely on PSTN or ISDN return paths. That includes broadcast equipment manufacturers, modem and terminal designers, and service providers that need a defined interaction channel for DVB services.

It is also relevant to system integrators and technical buyers who need PSTN or ISDN interoperability across different DVB delivery media. Quality and compliance teams use it to check that the modem, terminal interfaces, and call-control behavior follow the expected DVB interaction model.

Which standards are used with SIST ETS 300 801 E1:2003?

Clause 2 names these references and their roles:

• ETS 300 001 - PSTN attachment and call-related technical requirements for analogue subscriber interfaces.
• ETS 300 011 - ISDN primary rate user-network interface layer 1 and test principles.
• ETS 300 012 - ISDN basic rate user-network interface layer 1 and test principles.
• ETS 300 402 - ISDN data link layer, aligned with ITU-T Recommendation Q.921.
• ETS 300 403 - ISDN basic call control, aligned with ITU-T Recommendation Q.931.
• ITU-T V.21, V.22, V.22bis, V.23, V.25, V.32, V.32bis, V.34, V.42 - modem transmission and data communication recommendations.
• Council Directive 91/263/EEC - telecommunications terminal equipment conformity context.
• EN 50201 - interface for DVB-IRD equipment.
• ETS 300 802 - network-independent protocols for interactive services.

What does the SIST ETS 300 801 E1:2003 document contain?

SIST ETS 300 801 E1:2003 contains a layered system model, a DVB interactive system model, and detailed PSTN and ISDN connection arrangements. The figures in the document are used to show how the BC, IC, STU, NIU, BIM, and IIM fit together.

It also contains modem connection rules, call setup behavior, line monitoring, busy-line retry handling, and forced-disconnection behavior. For ISDN, it covers BRA connection and signalling, including emergency-call handling through the D channel.

Annex A gives a short bibliography that points to DVB commercial requirements and the DAVIC System Reference Model.

SLOVENSKI STANDARD
01-december-2003
Digitalna videoradiodifuzija (DVB) – Povratni kanal skozi javno komutirano
telefonsko omrežje (PSTN)/digitalno omrežje z integriranimi storitvami (ISDN)
Digital Video Broadcasting (DVB); Interaction channel through Public Switched
Telecommunications Network (PSTN)/ Integrated Services Digital Networks (ISDN)
Ta slovenski standard je istoveten z: ETS 300 801 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 801
TELECOMMUNICATION August 1997
STANDARD
Source: EBU/CENELEC/ETSI JTC Reference: DE/JTC-00DVB-24
ICS: 33.020
Key words: DVB, broadcasting, digital, video, TV, interaction, PSTN, ISDN
European Broadcasting Union Union Européenne de Radio-Télévision
EBU
UER
Digital Video Broadcasting (DVB);
Interaction channel through
Public Switched Telecommunications Network (PSTN) /
Integrated Services Digital Networks (ISDN)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
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 1997.
© European Broadcasting Union 1997.
All rights reserved.
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ETS 300 801: August 1997
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 comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 801: August 1997
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Abbreviations.7
4 System architecture of narrow-band Interaction Channels (IC) .8
4.1 Protocol stack model .8
4.2 System model .9
5 DVB Interaction Channel (IC) for PSTN.11
5.1 Physical interfaces between the modem, the user terminal and PSTN.11
5.1.1 External modem .11
5.1.2 Integrated modem .11
5.2 Calling procedures.11
5.2.1 Dialling.11
5.2.2 Line monitoring.11
5.3 Call attempt when service provider line is busy .11
5.4 Forced disconnection during dialling or data transfer .12
6 DVB Interaction Channel (IC) for ISDN.12
6.1 Physical interface for connection to ISDN BRA .12
6.2 Calling procedures.12
6.3 Forced disconnection.12
Annex A (informative): Bibliography.13
History.14

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ETS 300 801: August 1997
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ETS 300 801: August 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Joint Technical Committee
(JTC) of the European Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique
(CENELEC) and the European Telecommunications Standards Institute (ETSI).
NOTE: The EBU/ETSI 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 television 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 area; its headquarters is in Geneva *.
* European Broadcasting Union
Case Postale 67
CH-1218 GRAND SACONNEX (Geneva)
Switzerland
Tel: [phone]
Fax: [phone]
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 television 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
25 countries around the world, DVB fosters market-led systems, which meet the real needs, and
economic circumstances, of the consumer electronics and the broadcast industry.
Transposition dates
Date of adoption: 8 August 1997
Date of latest announcement of this ETS (doa): 30 November 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 May 1998
Date of withdrawal of any conflicting National Standard (dow): 31 May 1998

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ETS 300 801: August 1997
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ETS 300 801: August 1997
1 Scope
This European Telecommunication Standard (ETS) is the baseline specification for the provision of Return
Channel (RC) 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 satellite, cable, SMATV, terrestrial, MMDS or any future DVB system.
The solutions here provided for RC through PSTN/ISDN 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:
[1] ETS 300 001: "Attachments to the Public Switched Telephone Network (PSTN);
General technical requirements for equipment connected to an analogue
subscriber interface in the PSTN".
[2] ETS 300 011: "Integrated Services Digital Network (ISDN): Primary rate user-
network interface Layer 1 specification and test principles".
[3] ETS 300 012: "Integrated Services Digital Network (ISDN): Basic rate user-
network interface Layer 1 specification and test principles".
[4] ETS 300 402 (1994): "ISDN user-network interface - Data link layer
specification". ITU-T Recommendation Q.921 Rev. 1.
[5] ETS 300 403 (1994): "Digital subscriber Signalling System No. 1 (DSS 1) - ISDN
user-network interface layer 3 specification for basic call control".
ITU-T Recommendation Q.931 Rev. 1.
[6] ITU-T Recommendations V.21, V.22, V.22bis, V.23, V.25, V.32, V.32bis, V.34
and V.42.
[7] Official Journal of the European Communities, No. L 128, 23 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)".
[8] EN 50201: "Interface for DVB-IRD".
[9] ETS 300 802: "Digital Video Broadcasting (DVB); Network independent
protocols for interactive services".
3 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
BC Broadcast Channel
BIM Broadcast Interface Module
BRA Basic Rate Access
DAVIC Digital Audio VIsual Council
DCE Data Communication Equipment
DTE Data Termination Equipment
DTMF Dual-Tone Multi-Frequency (dialling mode)
DVB Digital Video Broadcasting
GSTN General Switched Telephone Network
IC Int
...