EN 50494:2007

SLOVENSKI STANDARD
01-januar-2008
Distribucija satelitskega signala po enojnem koaksialnem kablu v
enostanovanjskih inštalacijah
Satellite signal distribution over a single coaxial cable in single dwelling installations
Signalverteilung von Satellitensignalen über ein einziges koaxiales Kabelverteilnetz
Distribution de signaux satellites sur un seul câble coaxial dans les résidences
individuelles
Ta slovenski standard je istoveten z: EN 50494:2007
ICS:
33.060.30 Radiorelejni in fiksni satelitski Radio relay and fixed satellite
komunikacijski sistemi communications systems
33.120.10 Koaksialni kabli. Valovodi Coaxial cables. Waveguides
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50494
NORME EUROPÉENNE
October 2007
EUROPÄISCHE NORM
ICS 33.060.30; 33.160.01
English version
Satellite signal distribution over a single coaxial cable
in single dwelling installations

Distribution de signaux satellites  Signalverteilung von Satellitensignalen
sur un seul câble coaxial über ein einziges koaxiales
dans les résidences individuelles Kabelverteilnetz

This European Standard was approved by CENELEC on 2007-03-01. 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, 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 50494:2007 E
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 50494 on 2007-03-01.
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) 2008-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-03-01
__________
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Contents
Introduction.5
1 Scope .5
2 Normative references.6
3 Acronyms and definitions .6
3.1 Acronyms.6
3.2 Definitions.7
4 System architecture .7
5 SCIF control signals. 10
5.1 DC levels .10
5.2 Method of the data bit signalling. 11
5.3 Structure of the DiSEqC message in the single coaxial cable system . 11
6 Structure and format of the DiSEqC messages . 12
6.1 DiSEqC addressesl. 12
6.2 Normal operation. 12
6.2.1 ODU_Channel_change . 13
6.2.2 ODU_PowerOFF . 14
6.3 Special modes. 14
6.3.1 Installation, SCIF parameters recognition . 14
6.3.2 ODU_UBxSignal_ON. 16
6.3.3 ODU_Config . 16
6.3.4 ODU_LoFreq. 17
7 Look-up tables and conventions. 17
7.1 UB slots numbering . 17
7.2 Input banks numbering . 18
7.3 Config_Nb table . 18
7.4 LoFreq table. 19
8 Traffic collision management rules. 20
9 Optional extension of the single cable distribution to the multi-dwelling installations . 22
9.1 Extension for multi-dwelling installations.22
9.2 Extensions for structure and format of the DiSEqC messages . 23
9.3 Specific commands for installation (see 6.3.1 to 6.3.4) . 23
9.4 Installation with manual entry of the system parameters, PIN code handling . 24
9.5 SDU and MDU compatibility rules . 25
Annex A (informative) Implementation guidelines . 26
A.1 Installation impedance .26
A.2 Installation: signal reflection and returned loss. 26
A.3 Power supply of the SCIF. 27
A.4 Tuning word calculation, software recommendations . 28
A.5 RF scanning, RF tone recognition, SCIF parameter recognition. 29

Figures
Figure 1 – General architecture of the single cable distribution .6
Figure 2 – General system operation and UB slot frequency mapping .8
Figure 3 – Installation example, system with two UB slots .9
Figure 4 – Installation example implementing a monobloc LNB with four UB slots .9
Figure 5 – Example of a switcher with two outputs serving six UB slots each . 10
Figure 6 – Outlines of the signal sent by the receiver . 11
Figure 7 – Bit signalling according to DiSEqC format . 11
Figure 8 – DiSEqC command structure . 12
Figure 9 – Example of signal structure delivered by the SCIF featuring four UB slots after
an ODU_UBxSignal_ON. 16
Figure 10 – DiSEqC command collision between two receivers and recovery system . 21
Figure 11 – Pseudo random delay generation for the repeat operation . 22
Figure 12 – Example of signal spectrum delivered by a SCIF (with MDU option) after an
ODU_UbxSignal_ON (or an ODU_UbxSignal_ON_MDU ) command . 24
Figure A.1 – Solution for masking the impedance of the installation during the DiSEqC
commands. 26
Figure A.2 – Implementation of an external power supply . 27
Figure A.3 – Example of a RF spectrum found after an ODU_UBxSignal_ON. 29
Tables
Table 1 – Automatic installation sub-functions. 15
Table 2 – UB slot numbering . 17
Table 3 – Input bank numbering . 18
Table 4 – Config_Nb table . 18
Table 5 – Local oscillation (LO) table in Standard RF (Conventional RF ) . 19
Table 6 – Local oscillation (LO) table in Wide band RF . 19
Table 7 – Expected system behaviour . 25

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Introduction
In EN 61319-1:1995 the interfaces for the control and command of the devices associated with the
satellite receivers are described in the following clauses:
– Clause 4: Interfaces requirements for polarizer and polar switchers;
– Clause 5: Interfaces requirements for low-noise block converters (LNB).
In these clauses, analogue techniques are described for controlling the LNB and polar switchers.
In EN 61319-1/A11, the “Digital Satellite Equipment Control Bus” (called DiSEqC) is introduced as a
single method of communication between the satellite and the peripheral equipment, using only the
existing coaxial cables.
The purpose of this document is to introduce a complete system for distributing via a single coaxial
cable signals issued from different bands and polarizations to several satellite receivers.
The presented system is intended for single dwelling installation (individual subscriber installations)
but in Clause 9 of this document there is also described an optional extension for multiple dwelling
installations.
The presented system is scaled for installations in which the number of demodulators is limited to a
maximum number of 8 units per output of the Single Cable Interface (hereafter referred to as SCIF)
device.
1 Scope
This European Standard describes:
– the system physical structure;
– the system control signals, which implement an extension of the DiSEqC set of commands
described in the DiSEqC bus functional specification;
– the definition of identified configurations;
– management of the potential collisions in the control signals traffic.
Figure 1 illustrates the physical system configuration considered in this European Standard.
Several satellite signal demodulators can receive signals from any of the input signal banks of the LNB
or the switch; the signals selected by the demodulators (or receivers) are transported via a single
cable to these demodulators (receiver 1, receiver 2, receiver N).
To achieve these single cable distributions, the Single Cable Interface (SCIF) (likely embedded in a
LNB or a Switch) features some specific functions and characteristics.

SSIINGNGLLEE C CAABLBLEE
ReceiReceivveer 1r 1
ININTTEERRFFAACCEE: : SCIF
SCIF
BanBankk 1 1
Receiver 2
Receiver 2
LLNNB B
Power
Power
oror
BanBankk 2 2
splitter
splitter
SWSWIITTCCHH
BanBankk M M
Receiver N
Receiver N
Single cable
Single cable
connection
connection
AA re receiver maceiver mayy in integrtegratate see sevveeral deral demmoodduulalators tors

Figure 1 – General architecture of the single cable distribution
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 50083-4 Cable networks for television signals, sound signals and interactive services –
Part 4: Passive wideband equipment for coaxial cable networks
EN 61319-1:1996 Interconnections of satellite receiving equipment – Part 1: Europe
+ A11:1999 (IEC 61319-1:1995)
EN ISO/IEC 13818-1 Information technology – Generic coding of moving pictures and associated
audio information – Part 1: Systems (ISO/IEC 13818-1)
TM
“DiSEqC ” Bus Functional Specification Version 4.2, February 25, 1998
http://www.eutelsat.com/satellites/4_5_5.html
3 Acronyms and definitions
3.1 Acronyms
CW Continuous Wave
DiSEqC Digital Satellite Equipment Control
LNB Low Noise Block
LUT Look-up Table
MDU Multiple Dwelling Unit
MSB Most significant bit
ODU Out-door Unit
PCR Program clock reference
PWK Pulse Width Keying
SCIF Single Cable Interface
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