SIST-TP CLC/TR 50083-5-1:2009

SLOVENSKI STANDARD
01-julij-2009
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve - 5-1.
del: Prehodi IP in vmesniki za glavne sprejemne postaje
Cable networks for television signals, sound signals and interactive services - Part 5-1:
IP gateways and interfaces for headends
Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste - Teil 5-1: IP-
Gateways und -Schnittstellen für Kopfstellen
Réseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion
sonore et services interactifs - Partie 5-1: Passerelles IP et interfaces pour les têtes de
réseau
Ta slovenski standard je istoveten z: CLC/TR 50083-5-1:2009
ICS:
33.060.40 Kabelski razdelilni sistemi Cabled distribution systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CLC/TR 50083-5-1
RAPPORT TECHNIQUE
April 2009
TECHNISCHER BERICHT
ICS 33.060.40
English version
Cable networks for television signals,
sound signals and interactive services -
Part 5-1: IP gateways and interfaces for headends

Réseaux de distribution par câbles  Kabelnetze für Fernsehsignale,
pour signaux de télévision, Tonsignale und interaktive Dienste -
signaux de radiodiffusion sonore Teil 5-1: IP-Gateways
et services interactifs - und -Schnittstellen für Kopfstellen
Partie 5-1: Passerelles IP
et interfaces pour les têtes de réseau

This Technical Report was approved by CENELEC on 2009-03-13.

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: avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TR 50083-5-1:2009 E

Foreword
This Technical Report was prepared by the Technical Committee CENELEC TC 209, Cable networks
for television signals, sound signals and interactive services.
The text of the draft was submitted to vote in accordance with the Internal Regulations, Part 2,
Subclause 11.4.3.3 (simple majority) and was approved by CENELEC as CLC/TR 50083-5-1 on
2009-03-13.
__________
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Contents
1 Scope . 5
1.1 General scope . 5
1.2 Specific scope of this Technical Report . 5
2 Normative references. 7
3 Terms, definitions, symbols and abbreviations . 8
3.1 Terms and definitions . 8
3.2 Abbreviations .10
4 Application of IP transmission in cable networks .12
4.1 Introduction .12
4.2 Transmission from central headends to sub-headends .13
4.3 Transmission via sub-headends into regional and local networks .14
5 MPEG transport streams .16
5.1 Introduction .16
5.2 Programme Specific Information tables (PSI) and Service Information tables (SI) .16
5.3 Programme Clock Reference (PCR) .18
5.4 Null packets .19
5.5 Constant Bit Rate (CBR) vs. Variable Bit Rate (VBR) .19
6 Encapsulation of MPEG-2 transport streams .19
6.1 Principles of encapsulation .19
6.2 Payload data rate .20
6.3 The Ethernet interface according to ISO/IEC 8802-3 (IEEE 802.3) standards .21
6.4 Internet protocols .27
Bibliography .31
Figures
Figure 1 – Examples of IP gateways/interfaces at the input of headends . 6
Figure 2 – Examples of IP gateways/interfaces at the output of headends . 6
Figure 3 – IP transmission chain . 12
Figure 4 – Central headend with internal IP connections (Ethernet) . 13
Figure 5 – Central headend with internal ASI connections . 14
Figure 6 – Gateway function of sub-headends with internal IP connections (Ethernet) . 15
Figure 7 – Gateway function of sub-headends with internal ASI connections . 15
Figure 8 – Overview PSI/SI tables . 17
Figure 9 – Principle of MPEG-2 transport stream encapsulation . 19
Figure 10 – Encapsulation of n MPEG-2 transport stream packets . 20
Figure 11 – Useful data rate for MPEG-2 transport streams on a Gigabit Ethernet
connection . 21
Figure 12 – RJ 45 connector for use with 10Base-T and 100Base-T Ethernet systems . 23
Figure 13 – Duplex-able LC connectivity configuration with an example of polarity
identification for Ethernet systems. . 26
Figure 14 – Duplex SC connectivity configuration for Ethernet systems . 26

Figure 15 – Principle of unicast connection . 27
Figure 16 – Principle of multicast connection . 28
Figure 17 – Structure of IGMP headers . 29

Tables
Table 1 – Parameters of 10Base-T and 100Base-T Ethernet systems . 22
Table 2 – Parameters of 1000Base-T and 10GEBase-T Ethernet systems . 23
Table 3 – Connector pin assignments for 10Base-T and 100Base-T Ethernet systems . 24
Table 4 – Connector pin assignment for 1000Base-T Ethernet system . 24
Table 5 – Parameters of Ethernet systems for all-silica multimode fibres . 25
Table 6 – Parameters of Ethernet systems for all-silica singlemode fibres . 25
Table 7 – Reserved addresses for IP multicast . 29
Table 8 – Message types . 30

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1 Scope
1.1 General scope
Standards of the EN 60728 series deal with cable networks including equipment and associated
methods of measurement for headend reception, processing and distribution of television signals,
sound signals and their associated data signals and for processing, interfacing and transmitting all
kinds of signals for interactive services using all applicable transmission media.
This includes
1)
• CATV -networks,
• MATV-networks and SMATV-networks,
• individual receiving networks
and all kinds of equipment, systems and installations installed in such networks.
The extent of this standardisation work is from the antennas and/or special signal source inputs to the
headend or other interface points to the network up to the terminal input.
The standardisation of any user terminals (i.e., tuners, receivers, decoders, multimedia terminals, etc.)
as well as of any coaxial, balanced and optical cables and accessories thereof is excluded.
1.2 Specific scope of this Technical Report
This Technical Report is an adjunct to the EN 60728/EN 50083 standards series and describes the
characteristics of equipment which is used for the connection of IP based networks to and from
headends such as described in EN 60728-5. Specifications from the transmission standard
ETSI TS 102 034 are taken into account where applicable. The content of the data streams can be
digital video, audio or other digital data.
This Technical Report describes the necessary characteristics and parameters of equipment such as
IP gateways or IP interfaces on equipment at the input of headends (Figure 1) as well as at the output
of headends (Figure 2).
Equipment at the input of headends can be either IP gateways which enable the connection to a
DVB-ASI headend infrastructure according EN 50083-9 or, in the case of modular headend systems
can also be single equipment with IP interfaces such as DVB modulators, transcoders, multiplexers
and FM radio processors as shown in Figure 1. Edge devices are also covered by this technical
report.
———————
1)
This word encompasses the HFC networks used nowadays to provide telecommunications services, voice, data, audio and
video both broadcast and narrowcast.

Figure 1 – Examples of IP gateways/interfaces at the input of headends
Equipment at the output of headends can be either IP gateways which enable the connection from
DVB-ASI interfaces according EN 50083-9 to IP based networks or, in the case of modular headend
systems, can also be single equipment with IP interfaces such as encoders, multiplexers and switches
as shown in Figure 2.
RF IP
IRD
ASI
IP
IP Gateway
Data
Video IP
Audio
Encoder
ASI
IP
or
IP
Multiplexer
Figure 2 – Examples of IP gateways/interfaces at the output of central headends
The scope of this Technical Report covers all three quality grades as defined in EN 60728-5.

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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 50083-9 Cable networks for television signals, sound signals and interactive
services - Part 9: Interfaces for CATV/SMATV headends and similar
professional equipment for DVB/MPEG-2 transport streams
EN 60728-5 Cable networks for television signals, sound signals and interactive
services - Part 5: Headend equipment
Fibre optic connector interfaces -- Part 20: Type LC connector
EN 61754-20
family
ETSI EN 300 468 Digital Video Broadcasting (DVB);Specification for Service
Information (SI) in DVB systems
ETSI TS 101 154 Digital Video Broadcasting (DVB);Specification for the use of Video
and Audio Coding in Broadcasting Applications based on the
MPEG-2 Transport Stream
ETSI TS 102 034 Digital Video Broadcasting (DVB);Transport of MPEG-2 TS Based
DVB Services over IP Based Networks
IEC 60874-19 (series) Fibre optic interconnecting devices and passive components -
Connectors for optical fibres and cables - Part 19: Fibre optic
connectors type duplex SC
Information technology - Telecommunications and information
ISO/IEC 8802-3:2000
exchange between systems - Local and metropolitan area networks
2)
- Specific requirements - Part 3: Carrier sense multiple access with
(IEEE 802.3-2005 )
collision detection (CSMA/CD) access method and physical layer
specifications
ISO/IEC 11801 Information technology - Generic cabling for customer premises
+ Amendment 1
ISO/IEC 13818-1 Information technology - Generic coding of moving pictures and
associated audio information: Systems
ISO/IEC 13818-2 Information technology - Generic coding of moving pictures and
associated audio information: Video
ISO/IEC 13818-3 Information technology - Generic coding of moving pictures and
associated audio information - Part 3: Audio
———————
2)
The last edition of IEEE 802.3 was published in 2005 with several corrections and amendments published in 2006 and 2007.
Information on the actual version could be found at http://standards.ieee.org/getieee802/802.3.html.
Information on the structure of document IEEE 802.3 is provided in the Bibliography of this Technical Report.
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