SIST EN 50478:2007

SLOVENSKI STANDARD
SIST EN 50478:2007
01-december-2007
Specifikacija funkcijskega sprejemnika satelitske digitalne interaktivne televizije s
povratnim kanalom z nizko podatkovno hitrostjo - Specifikacija modemske plasti
Functional receiver specification of satellite digital interactive television with a low data
rate return channel via satellite - Modem layer specification
Funktionale Empfängerspezifikation für digitales interaktives Satellitenfernsehen mit
Rückkanal niedriger Datenrate über Satellit - Festlegungen Modemschicht
Spécification pour le fonctionnement du récepteur pour la télévision interactive par
satellite avec une voie de retour a bas débit par satellite - Spécification du modem de la
couche
Ta slovenski standard je istoveten z: EN 50478:2007
ICS:
33.060.30 Radiorelejni in fiksni satelitski Radio relay and fixed satellite
komunikacijski sistemi communications systems
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
SIST EN 50478:2007 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN 50478

NORME EUROPÉENNE
February 2007
EUROPÄISCHE NORM

ICS 33.060.30; 33.170


English version


Functional receiver specification
of satellite digital interactive television
with a low data rate return channel via satellite -
Modem layer specification



Spécification pour le fonctionnement  Funktionale Empfängerspezifikation
du récepteur pour la télévision interactive für digitales interaktives
par satellite avec une voie de retour Satellitenfernsehen mit Rückkanal
à bas débit par satellite - niedriger Datenrate über Satellit -
Spécification du modem de la couche Festlegungen Modemschicht





This European Standard was approved by CENELEC on 2006-06-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in two official versions (English and German). A version in any other language
made by translation under the responsibility of a CENELEC member into its own language and notified to the
Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50478:2007 E

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EN 50478:2007 – 2 –
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 206, Consumer
equipment for entertainment and information and related sub-systems.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 50478 on 2006-06-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-09-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-06-01
__________

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– 3 – EN 50478:2007
Contents
Introduction.7
1 Scope .9
2 Normative references .9
3 Definitions, symbols and abbreviations.9
3.1 Definitions.9
3.2 Symbols.10
3.3 Abbreviations.11
3.4 Reference Model for Satellite Interactive Networks.13
3.4.1 Protocol Stack Model.13
3.4.2 System Model.14
3.4.3 Reference System Architecture for SATMODE .15
4 Terminal forward link interface.18
4.1 Broadcast Interface .18
4.1.1 Frequency.18
4.1.2 Modulation/Coding.18
4.1.3 Symbol rate.18
4.1.4 Polarization.18
4.2 Forward Interaction Path .18
4.2.1 Forward Interactive Traffic Data.18
4.2.2 Forward Link signalling .19
5 Terminal return link interface .22
5.1 General.22
5.1.1 Access Method .22
5.1.2 Network.24
5.1.3 Beams.24
5.1.4 Carrier groups.24
5.1.5 Services.25
5.1.6 Classes of service and priority.25
5.1.7 Usage of return link physical resources .25
5.2 Physical Layer Interface .27
5.2.1 Return link synchronisation.27
5.2.2 Return Link Coding and Modulation.37
5.2.3 Frequency and time structuring .50
5.2.4 Power mask.55
5.2.5 Polarisation Return Link SATMODE terminal .56
5.2.6 Return Link Symbol rate .56
5.2.7 Power Spectral Control.56
5.2.8 Programmability, range and granularity of configurable parameters.57
5.3 Data Link Layer Interface .58
5.3.1 Return Data Link Layer and Protocols Stack .58
5.3.2 Description of the MAC protocol .67
6 Security, authentication, encryption.75
7 Software download .76
Annex A (normative) Description of tables syntax .77
Annex B (normative) Definition terminal processing delay D .95
proc_term
Annex C (informative) Typical implementation examples.96
Annex D (informative) SATMODE Project .112
Bibliography.114

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EN 50478:2007 – 4 –
Figures
Figure 1 – Layer structure for generic system reference model.13
Figure 2 – A generic system Reference Model for Interactive Systems .14
Figure 3 – Overall system description of SATMODE.16
Figure 4 – Interactive traffic data .17
Figure 5 – Tables of PAT, PMT descriptors.22
Figure 6 – Time and frequency Slotted Aloha.23
Figure 7 – Organisation of the network and spectral resources .26
Figure 8 – Description of delays between SATMODE terminal and HUB.28
Figure 9 – Forward link signalling parameters.29
Figure 10 – Frame start origin .30
Figure 11 – Terminal Operation.32
Figure 12 – Login Procedure .35
Figure 13 – TX pointing procedure .36
Figure 14 – Waveform generation .37
Figure 15 – Randomizer .38
Figure 16 – CRC calculation.38
Figure 17 – Flexible encoder architecture .39
Figure 18 – Equivalent scheme for mode 1 (PCCC).39
Figure 19 – Equivalent scheme for mode 2 (SCCC).40
Figure 20 – Equivalent scheme for mode 3 (CC).40
Figure 21 – Equivalent scheme for mode 4 (QRCC) .40
Figure 22 – Logical implementation of a programmable CC.41
Figure 23 – CC, ring quaternary mode .43
Figure 24 – Mapping of bits .45
Figure 25 – UW Sequence .49
Figure 26 – Organization of time slots.50
Figure 27 – State chart for content lost packets .52
Figure 28 – Power Mask.56
Figure 29 – SATMODE return channel protocol stack.59
Figure 30 – SATMODE datalink layer.60
Figure 31 – LLC header.61
Figure 32 – Segmentation and reassembly/adaptation to MAC packet format.63
Figure 33 – MAC packet format.64
Figure 34 – IEEE format MAC address .64
Figure 35 – SATMODE MAC protocol.67
Figure 36 – Sliding windows and priorities .68
Figure 37 – Reset sequence initiated by the Terminal.70
Figure 38 – Terminal State Diagram.71
Figure 39 – Reset sequence initiated by the HUB.71
Figure 40 – State diagram for the reset sequence initiated by the HUB.72
Figure C.1 – Scheme for mode 1.101
Figure C.2 – GMSK definition.105
Figure C.3 – Phase pulse shape .106
Figure C.4 – Overall Unique Word composition and length.108

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– 5 – EN 50478:2007
Figure C.5 – Organisation of time and frequency slots for four CGs .109
Figure C.6 – Typical phase noise of the SATMODE terminal.110
Figure C.7 – Typical filter frequency response .110
Figure C.8 – SMATV Typical implementation.111

Tables
Table 1 – Repetition rates .19
Table 2 – Descriptor identification and location .20
Table 3 – (DVB-SI) service descriptor .20
Table 4 – SATMODE service descriptor.21
Table 5 – SATMODE content descriptor .21
Table 6 – Possible COS types.25
Table 7 – Definition of login and TX-pointing procedure states .33
Table 8 – Commands .33
Table 9 – Burst structure .36
Table 10 – Initial contents of the randomizer register.37
Table 11 – Flexible encoder modes map.39
Table 12 – Deserialising of data bits.42
Table 13 – SIPO definition.44
Table 14 – PISO definition.44
Table 15 – + mod 4 definition .44
Table 16 – x mod 4 definition.44
Table 17 – Definition of CPM ranges.47
Table 18 – Linear symbol mapping for binary CPM (M = 2) .47
Table 19 – Gray symbol mapping for quaternary CPM (M = 4) .48
Table 20 – Linear symbol mapping for quaternary CPM (M = 4).48
Table 21 – Normalisation sequence lookup table for GMSK (M = 2; k = 1; p = 2).50
Table 22 – Range and granularity of configurable parameters.58
Table 23 – End of message bit.64
Table 24 – Priority .65
Table 25 – Sequence number .65
Table A.1 – FCT Syntax .77
Table A.2 – modulation_type value .81
Table A.3 – encoder_type value.81
Table A.4 – CC1_trellis_termination type .82
Table A.5 – CC2_trellis_termination type .83
Table A.6 – FAT syntax.84
Table A.7 – cos_id types .86
Table A.8 – SMT syntax .87
Table A.9 – SATMODE_mac_address types.89
Table A.10 – message_type.89
Table A.11 – login_response.90
Table A.12 – reset_level.90
Table A.13 – Structure SMT table .90
Table A.14 – DMT syntax .91

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EN 50478:2007 – 6 –
Table A.15 – SUT syntax.93
Table C.1 – Typical SATMODE clear sky link budget.97
Table C.2 – Example of Ku/Ku link budget including provisions for rain fade.99
Table C.3 – Setting for muxes values.101
Table C.4 – PR polynomial.101
Table C.5 – PB polynomial .101
Table C.6 – PY polynomial .102
Table C.7 – PW polynomial .102
Table C.8 – CC1 puncturing periods .102
Table C.9 – CC1 puncturing patterns for code rate 1/2 .102
Table C.10 – CC2 puncturing periods .102
Table C.11 – CC2 puncturing patterns for code rate 1/2 .102
Table C.12 – Circular state look up table.103
Table C.13 – Interleaving function for PI1 .103
Table C.14 – Interleaver parameters PI1.104
Table C.15 – Interleaving function for PI2 .104
Table C.16 – Interleaving function for PI2 (randomized) .105
Table C.17 – q(k) codes for GMSK.107
Table C.18 – Implementation example of a Carrier group organisation.108

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– 7 – EN 50478:2007
Introduction
This European Standard has been produced by CENELEC Committee TC 206 with the support of the
research and development activities carried out within the SATMODE Project. The SATMODE project
is part of the ARTES program of the European Space Agency (Contract No 16905/02/NL/US). More
information on SATMODE project is available in Annex D.
This document provides the specification containing the essential elements necessary to facilitate the
implementation of the interaction channel for interactive television networks using Geostationary
Satellites with fixed return channel satellite terminals via low data rate dedicated return link.
The system is called SATMODE and consists of many terminals installed at the user-customer
premises, one or several HUB stations, possibly co-located with the broadcaster or interactive service
provider uplink stations, and a satellite which is transparent for uplink and downlink signals. The main
application for SATMODE system is the implementation of suitable networks for interactive digital
television systems requiring a return channel of low data rate.
The document facilitates the use of SATMODE system for individual or collective installation (e.g.
SMATV) in a domestic environment applied to interactive digital television (iTV). It also supports the
connection of such terminals with in-house data networks. The document may be applied to all
frequency bands allocated to GEO satellite services. The solutions provided for interaction channel for
satellite interactive networks are a part of a wide set of alternatives to implement interactive services
associated to digital television systems following the DVB reference model for interactive services.
The modem layer specification included in this document (physical air interface layer and data link
layer components) describes the requirements needed to establish radio communication links
between the user earth stations (terminals) and the HUB earth station and between the HUB station
and the user terminals.
The Satmode System
The SATMODE design having led to the present specification was optimized for the iTV case.
The choice of constant envelope modulations was made to minimize the terminal cost. Thanks to this
property,
...