EN 50083-10:2002

SLOVENSKI STANDARD
01-december-2003
1DGRPHãþD
SIST EN 50083-10:2000
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve - 10.
del: Lastnosti sistema za povratne poti
Cable networks for television signals, sound signals and interactive services - Part 10:
System performance for return paths
Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste - Teil 10: Rückkanal-
Systemanforderungen
Réseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion
sonore et services interactifs - Partie 10: Caractéristiques des systèmes de voie de
retour
Ta slovenski standard je istoveten z: EN 50083-10:2002
ICS:
33.060.40
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50083-10
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2002
ICS 33.060.40 Supersedes EN 50083-10:1999
English version
Cable networks for television signals,
sound signals and interactive services
Part 10: System performance for return paths
Réseaux de distribution par câbles Kabelnetze für Fernsehsignale,
pour signaux de télévision, Tonsignale und interaktive Dienste
signaux de radiodiffusion sonore Teil 10: Rückkanal-Systemanforderungen
et services interactifs
Partie 10: Caractéristiques des systèmes
de voie de retour
This European Standard was approved by CENELEC on 2001-10-01. 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 three official versions (English, French, 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, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,
Norway, Portugal, Spain, Sweden, Switzerland and 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
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50083-10:2002 E
Foreword
This European Standard was prepared by CENELEC Technical Committee TC 209, "Cable
networks for television signals, sound signals and interactive services" on the basis of
EN 50083-10:1999 and the first amendment to EN 50083-10.
The text of this first amendment was submitted to the Unique Acceptance Procedure and was
approved by CENELEC on 2001-10-01 to be published as part of a second edition of
EN 50083-10.
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) 2002-10-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2004-10-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, Annex B is normative and Annexes A and C are informative.
__________
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Contents
Page
1 Scope. 4
1.1 General. 4
1.2 Specific scope of this part 10. 4
2 Normative references . 5
3 Terms, definitions, symbols and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Symbols. 8
3.3 Abbreviations. 9
4 Methods of measurement . 10
4.1 Setup of the network. 10
4.2 Measurement of signal level . 12
4.3 Measurement of amplitude response variation . 13
4.5 Measurement of multiple interference. 16
4.6 Measurement of impulse noise. 17
4.7 Measurement of echo ratio. 18
4.8 Measurement of group delay variation. 19
4.9 Measurement of frequency error . 19
4.10 Measurement of Bit Error Rate (BER) . 20
5 System performance requirements. 22
5.1 Introduction. 22
5.2 Analogue parameters influencing system performance . 23
5.3 General requirements. 24
5.4 Specific system performance requirements. 24
6 System performance recommendations. 25
6.1 Proposal for the use of the return path bandwidth . 25
Annex A (informative) System performance requirements for different
modulation techniques.…. 27
Annex B (normative) Correction factors for noise. 28
Annex C (informative) Bibliography. 30

1 Scope
1.1 General
Standards of EN 50083 series deal with cable networks for television signals, sound signals and
interactive services including equipment, systems and installations
− for headend-reception, processing and distribution of television and 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.
All kinds of networks like
− CATV-networks
− MATV-networks and SMATV-networks
− individual receiving networks
and all kinds of equipment, systems and installations installed in such networks, are within this
scope.
The extent of these standardisation work is from the antennas, special signal source inputs to the
headend or other interface points to the network up to the system outlet or the terminal input,
where no system outlet exists.
The standardisation of any user terminals (i.e. tuners, receivers, decoders, multimedia terminals
etc.) as well as of any coaxial and optical cables and accessories therefor is excluded.
1.2 Specific scope of this part 10
This standard is dealing with the transparent return path of cable networks operated in the
frequency range between 5 MHz and 65 MHz or parts thereof. Higher frequencies may be used in
fibre based networks.
NOTE  In addition it is possible to use the frequency range from 0 MHz to 5 MHz for return path transmissions, e.g. for
NMS or other control, monitoring and signalling purposes. Applications below 5 MHz are not covered by this standard.
An active return path carries typically only return signals. A passive return path can be used for
both return and forward signals.
This standard lays down the basic methods of measurement for signals typically used in the return
path of cable networks in order to assess the performance of those signals and their performance
limits.
All requirements refer to the performance limits which shall be obtained between the reference
points (Figure 1) of the return path system.
One reference point is the network termination close to the subscriber. It is the last point where all
forward and return signals are present and carried on the same cable. If no network termination
point exists, the reference point is the system outlet.

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The other reference point is the input of the return signal receiver (or transceiver). At this point the
transparent signal path ends and behind this point the signal is treated in a non-transparent way.
The return signal receiver can be situated at the headend but can also be at the node of the
coaxial cell or at any other point of the network.
TV
O
E
Network termination
Reference point
Figure 1 - Reference points of an active return path system (example)
In addition to the system performance requirements for the transparent return path, system
performance recommendations were laid down in this standard e.g. for the overall frequency
allocation, for the use of specific modulation techniques for different interactive multimedia
services or for different sub-bands within the return path frequency range, etc.
Specific equipment installed in cable networks for the operation of such return paths is
standardised in the relevant equipment standards, parts 3 to 6 of the EN 50083 series.
Transmission systems are not within the scope of this standard.
2 Normative references
This European Standard incorporates, by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by amendment
or revision. For undated references, the latest edition of the publication referred to applies.
EN 50083 Cable networks for television signals, sound signals and
interactive services
EN 50083-1 1993 Part 1: Safety requirements
+ A1 1997
+ A2 1997
EN 50083-2 2001 Part 2: Electromagnetic compatibility for equipment
EN 50083-3 2002 Part 3: Active wideband equipment for coaxial cable networks
EN 50083-4 1998 Part 4: Passive wideband equipment for coaxial cable
networks
EN 50083-5 2001 Part 5: Headend equipment
EN 50083-6 1997 Part 6: Optical equipment
EN 50083-7 1996 Part 7: System performance
+ A1 2000
EN 50083-8 2002 Part 8: Electromagnetic compatibility for networks
ES 200 800 2001 Digital Video Broadcasting (DVB); DVB interaction channel for
V1.3.1 Cable TV distribution systems (CATV)
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
3.1.1
amplitude response variation
peak-to-peak variation in frequency amplitude response of a specified signal path over a specified
frequency band, expressed in dB
3.1.2
broadcast signal
signal comprising of video and/or audio and/or data content which is distributed to several
receivers simultaneously
3.1.3
channel availability
percentage of the time during which the channel fulfils all performance requirements. The duration
of the observation time has to be published
3.1.4
downstream direction
direction of signal flow in a cable network from the headend or any other central point (node) of a
cable network to the subscribers´ area
3.1.5
forward path (downstream)
part of a cable network by which signals are distributed in the downstream direction from the
headend or any other central point (node) of a cable network to the subscribers´ area
3.1.6
frequency error
quality of supply evaluated on the basis of the actual frequency of an electrical system compared
to the nominal value. Frequency error consists of initial error, short term and long term frequency
stability
3.1.7
headend
equipment which is connected between receiving antennas or other signal sources and the
remainder of the cable network, to process the signals to be distributed
NOTE  The headend may, for example, comprise antenna amplifiers, frequency converters, combiners, separators and
generators.
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3.1.8
hybrid fibre coaxial network (HFC)
cable network which is comprised of optical equipment and cables and coaxial equipment and
cables in different parts
3.1.9
impulse noise
noise which is caused by electromagnetic interference into cable networks. Impulse noise is
characterised by pulses with a duration of typically < 10 µs
3.1.10
ingress noise
noise which is caused by electromagnetic interference into cable networks. Its power decreases
with increasing frequency. It is permanently present but slowly varies in its intensity as a function
of time
3.1.11
interaction path
part of a cable network by which interactive signals are transmitted in the downstream direction
(from the headend or node to the subscriber) and in the upstream direction (from the subscriber to
the headend or node)
3.1.12
location specific noise
noise which occurs at a specific area of a cable network or which occurs in a cable network
located in a specific environment
3.1.13
multiple interference
interfering signal which consists of ≥ 2 signals which originate from ≥ 2 sources
NOTE  On return path the multiple interference consists of ingress noise and intermodulation distortion products.
3.1.14
multimedia signal
signal comprising of two or more different media contents e.g. video, audio, text, data, etc.
3.1.15
network management system (NMS)
software based system for controlling and supervising cable networks
3.1.16
network segment
part of a cable network comprising a set of functions and/or a specific extent of the complete cable
network
3.1.17
netwo
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