SIST-TS CLC/TS 50083-3-3:2015

SLOVENSKI STANDARD
SIST-TS CLC/TS 50083-3-3:2015
01-februar-2015
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Cable networks for television signals, sound signals and interactive services - Part 3-3:
Active wideband equipment for cable networks - Methods of measurement of the
maximum operating output level in the return path
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Systèmes de distribution par cables destinés aux signaux de radiodiffusion sonore, de
télévision et multimedia interactive - Partie 3-3 : ….
Ta slovenski standard je istoveten z: CLC/TS 50083-3-3:2014
ICS:
33.060.40 Kabelski razdelilni sistemi Cabled distribution systems
SIST-TS CLC/TS 50083-3-3:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS CLC/TS 50083-3-3:2015

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SIST-TS CLC/TS 50083-3-3:2015


TECHNICAL SPECIFICATION CLC/TS 50083-3-3

SPÉCIFICATION TECHNIQUE

TECHNISCHE SPEZIFIKATION
November 2014
ICS 33.060.40

English Version
Cable networks for television signals, sound signals and
interactive services - Part 3-3: Active wideband equipment for
cable networks - Methods of measurement of the maximum
operating output level in the return path
Réseaux de distribution par câbles pour signaux de Kabelnetze für Fernsehsignale, Tonsignale und interaktive
télévision, signaux de radiodiffusion sonore et services Dienste - Teil 3-3: Aktive Breitbandgeräte für Kabelnetze -
interactifs - Partie 3-3: Matériel actifs à large bande utilisés Messverfahren für den maximalen Betriebs-Ausgangspegel
dans les réseaux de distribution - Méthodes de mesure du im Rückweg
niveau de sortie maximal de fonctionnement dans la voie de
retour
This Technical Specification was approved by CENELEC on 2014-09-30.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

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


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. CLC/TS 50083-3-3:2014 E

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Contents Page
Foreword. 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions, symbols and abbreviations . 5
3.1 Terms and definitions . 5
3.2 Symbols . 7
3.3 Abbreviations . 8
4 Method of measurement of the maximum operating output level in the return path . 8
4.1 General. 8
4.1.1 Channel load and modulation format . 8
4.1.2 Return path frequency ranges . 8
4.1.3 Applied limit values . 8
4.2 Measurement parameters for full channel load (N = 6 or N = 8) . 9
4.3 Equipment required . 9
4.4 Connection of the equipment . 10
4.5 Measurement procedure . 10
4.6 Presentation of the measurement results . 11
4.7 Maximum operating output level for reduced channel loads . 11
Annex A (normative) Null packet and PRBS definitions . 12
A.1 Null packet definition . 12
A.2 PRBS definition . 13
Annex B (informative) Calculation formula for the maximum operating output level for reduced
channel loads . 14
B.1 General. 14
B.2 Measurement results as basis for calculation formula for reduced channel loads . 14
B.3 Calculation formula for median value . 15
B.4 Calculation formula for worst-case value . 15
Bibliography . 16

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Foreword
This document (CLC/TS 50083-3-3:2014) has been prepared by CLC/TC 209 “Cable networks for television
signals, sound signals and interactive services”.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.

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Introduction
Standards and deliverables of EN 60728 series and EN 50083 series deal with cable networks including equipment
and associated methods of measurement for headend reception, processing and distribution of television and
sound signals and for processing, interfacing and transmitting all kinds of data signals for interactive services using
all applicable transmission media. These signals are typically transmitted in networks by frequency-multiplexing
techniques.
This includes for instance
• regional and local broadband cable networks,
• extended satellite and terrestrial television distribution systems,
• individual satellite and terrestrial television receiving systems,
and all kinds of equipment, systems and installations used in such cable networks, distribution and receiving
systems.
The extent of this standardization 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 of the customer premises equipment.
The standardization work will consider coexistence with users of the RF spectrum in wired and wireless
transmission systems.
The standardization 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.

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1 Scope
This Technical Specification is applicable to the method of nonlinearity measurement for active cable network
equipment which carry a digital channel load in the return path. The digital channel load is represented by standard
DVB-C signals. The method of measurement of the maximum operating output level takes account of a full channel
load in the return path frequency range although different applications of return path amplifiers with partial channel
load or single channel load are also in practical use. The maximum operating output level for applications with
reduced channel loads could be derived from the result with a full channel load by applying a given calculation
formula.
The method considers the specific signal form and behaviour of digitally modulated signals and can be applied in
the return path frequency range (5 MHz to 65 MHz) as well as in the extended return path frequency range (5 MHz
to 85 MHz) according to EN 60728-10.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for
its application. For dated references, only the edition cited applies. For undated references, the latest edition of the
referenced document (including any amendments) applies.
EN 60728-10, Cable networks for television signals, sound signals and interactive services – Part 10: System
performance for return paths (IEC 60728-10)
ISO/IEC 13818-1, Information technology — Generic coding of moving pictures and associated audio information:
Systems — Part 1
3 Terms, definitions, symbols and abbreviations
For the purposes of this document, the following terms, definitions, symbols and abbreviations apply.
3.1 Terms and definitions
3.1.1
attenuation
ratio of the input power to the output power of an equipment or system, usually expressed in decibels
3.1.2
bit error ratio
BER
ratio between erroneous bits and the total number of transmitted bits
3.1.3
gain
ratio of the output power to the input power, usually expressed in decibels
3.1.4
level
decibel ratio of any power P to the standard reference power P , i.e
1 0
P
1
10 lg
P
0
decibel ratio of any voltage U to the standard reference voltage U , i.e
1 0
U
1
20 lg
U
0
2
Note 1 to entry: The power level may be expressed in decibels relative to P = (U /R) = (1/75) pW, i.e. in dB(P ), taking into
0 0 0
account that the level of P corresponds to 0 dB(P ) or, as more usually, in dB(pW), taking into account that the level of P
0 0 0
corresponds to –18,75 dB(pW). The voltage level is expressed in decibels relative to 1 μV (across 75 Ω), i.e. in dB(μV).

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3.1.5
maximum operating output level (worst-case)
U
max (N)
worst-case of maximum channel output level of a digitally modulated signal in the 64 QAM format with a symbol
rate of 6,9 MSymb/s with 15 % cosine roll-off, measured with full digital channel load
3.1.6
maximum operating output level
U
max,i (N)
measured maximum operating output level of a single measurement channel i with full digital channel load
3.1.7
modulation error ratio
MER
sum of the squares of the magnitudes of the ideal symbol vectors is divided by the sum of the squares of the
magnitudes of the symbol error vectors of a sequence of symbols, the result being expressed as a power ratio
in dB
N


2 2

 (I + Q )
∑ j j


 j=1 

MER= 10 lg in dB
 
N
 
2 2
(δI + δQ )
∑ j j
 

j=1 


3.1.8
modulation error ratio of EUT
MER
EUT
calculated value of modulation error ratio of the EUT following Figure 1 and using the following formula

Figure 1 − Interrelation between different MER contributions
MER MER
Meas Source
−−
 
10 10
MER =−−10 lg 10 10
EUT  

 
Note 1 to entry: The calculation with 10⋅lg is used for simplification reasons although it is well known that the disturbing signal
comprises of noise and nonlinear portions.

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3.1.9
modulation error ratio of complete measurement setup
MER
Meas
measured value of modulation error ratio of the complete measurement setup according to Figure 1 including the
equipment under test (EUT)
3.1.10
modulation error ratio of signal source
MER
Source
measured value of modulation error ratio of the signal generator when signal generator and measurement receiver
are directly connected
3.1.11
slope
difference in gain or attenuation at two specified frequencies between any two points in an equipment or system
Note 1 to entry: The slope sign is considered
a) negative when the attenuation increases with frequency (cables) or the gain (amplifiers) decreases with frequency,
b) positive when the gain (amplifiers) increases with frequency (compensating slope).
3.2 Symbols
The following graphical symbols are used in the figures of this Technical Specification. These symbols are either
listed in IEC 60617 or based on symbols defined in IEC 60617.
Symbols Terms  Symbols Terms
Equipment Under Test based
Combiner based on
on
 [IEC 60617-S00059
[IEC 60617-S00059
(2001–07)]

(2001–07)]

Variable attenuator Amplifier
[IEC 60617-S01245  [IEC 60617-S01239
(2001–07)] (2001–07]


Modulator Demodulator
[IEC 60617-S01278  [IEC 60617-S01278
(2001–07)] (2001–07]

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3.3 Abbreviations
BER bit error ratio
BER bit error ratio of source and measurement equipment
Source
BER measured bit error ratio value on measuring set
Mess
DOCSIS Data Over Cable Service Interface Specification
DVB Digital Video Broadcasting
DVB-C Digital Video Broadcasting, Cable
EUT equipment under test
MER modulation error ratio
MER modulation error ratio of EUT
EUT
MER modulation erro
...