SIST EN 50083-5:2003
(Main)Cable networks for television signals, sound signals and interactive services -- Part 5: Headend equipment
Cable networks for television signals, sound signals and interactive services -- Part 5: Headend equipment
Superseded by EN 60728-5:2008
Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste -- Teil 5: Geräte für Kopfstellen
Réseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion sonore et services interactifs -- Partie 5: Matériels de tête de réseau
Cable networks for television signals, sound signals and interactive services - Part 5: Headend equipment
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50083-5:2003
01-december-2003
1DGRPHãþD
SIST EN 50083-5:1995
Cable networks for television signals, sound signals and interactive services - Part
5: Headend equipment
Cable networks for television signals, sound signals and interactive services -- Part 5:
Headend equipment
Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste -- Teil 5: Geräte für
Kopfstellen
Réseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion
sonore et services interactifs -- Partie 5: Matériels de tête de réseau
Ta slovenski standard je istoveten z: EN 50083-5:2001
ICS:
33.060.40 Kabelski razdelilni sistemi Cabled distribution systems
SIST EN 50083-5:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50083-5:2003
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SIST EN 50083-5:2003
EUROPEAN STANDARD EN 50083-5
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2001
ICS 33.060.40 Supersedes EN 50083-5:1994
English version
Cable networks for television signals, sound signals and
interactive services
Part 5: Headend equipment
Réseaux de distribution par câbles Kabelnetze für Fernsehsignale,
pour signaux de télévision, signaux Tonsignale und interaktive Dienste
de radiodiffusion sonore et services Teil 5: Geräte für Kopfstellen
interactifs
Partie 5: Matériels de tête de réseau
This European Standard was approved by CENELEC on 1998-01-01. 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,
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
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50083-5:2001 E
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EN 50083-5:2001 - 2 -
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 50083-5:1994 and the first amendment to EN 50083-5.
The text of this first amendment was submitted to the Unique Acceptance Procedure and was
approved by CENELEC on 1998-01-01 with the request to prepare a second edition of
EN 50083-5, by incorporating this amendment into the European Standard EN 50083-5:1994.
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) 2001-10-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2001-10-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annexes A, B and D are normative and annexes C and E are informative.
__________
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Contents
Page
1 Scope.4
1.1 General.4
1.2 Specific scope of this part 5.4
2 Normative references.7
3 Terms, definitions, symbols and abbreviations.8
3.1 Terms and definitions .8
3.2 Symbols.11
3.3 Abbreviation.12
4 Methods of measurement.13
4.1 Single-channel intermodulation.13
4.2 Three-carrier intermodulation measurement.14
4.3 Two carrier intermodulation measurements for second and third order products .15
4.4 Carrier-to-spurious signal ratio at the output.16
4.5 Television carrier-to-noise ratio.18
4.6 Differential gain and phase for PAL/SECAM signals .22
4.7 Group delay variation.26
4.8 2T-pulse response, K-factor .27
4.9 Chrominance-luminance delay inequalities (20T-pulse method).28
4.10 Luminance non-linearity.30
4.11 Intermodulation distortion (FM stereo radio) .30
4.12 Decoding margin (Teletext).31
4.13 Hum modulation of carrier.33
5 Performance requirements and recommendations .36
5.1 Safety .36
5.2 Electromagnetic compability .36
5.3 Environmental.36
5.4 Marking.36
5.5 Mean time operation between failure (MTBF).37
6 Signal requirements .37
6.1 Indoor units.37
6.2 Outdoor units .40
7 Data publication requirements.40
7.1 General.40
7.2 Indoor units - TV (AM and FM).41
7.3 Indoor units - FM radio.45
7.4 Outdoor units .46
Annex A (normative) Definition of the specified test frequency range for
return loss and noise figure .48
Annex B (normative) Audio connector .49
Annex C (informative) Selectivity diagram for adjacent channel transmission .50
Annex D (normative) Special national conditions .54
Annex E (informative) Measurement errors which occur due to missmatched equipment.55
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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 this standardization 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 standardization 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 5
This standard defines the characteristics of equipment used in the headends of terrestrial
broadcast and satellite receiving systems (without satellite outdoor units and without those
broadband amplifiers in the headend as described in EN 50083-3). The satellite outdoor units
for FSS are described in standard ETS 300 158, for BSS in standard ETS 300 249. Test
methods for both types (FSS and BSS) of satellite outdoor units are laid down in ETS 300 457.
This standard
• covers the frequency range 5 MHz to 3000 MHz;
• identifies performance requirements for certain parameters;
• lays down data publication requirements for certain parameters;
• stipulates methods of measurements;
• introduces minimum requirements defining quality grades (Q-grades).
As far as possible this standard only deals with the interfaces between headend equipment and
only explains the function of the equipment if this is necessary to support the description of the
interfaces.
Coder, transcoder, encrypter, decrypter etc. are not described in this standard. If such
equipment are used in headends, the relevant parameters for RF, video, audio and data
interfaces have to be met.
According to the definitions in clause 3 the headends are divided into the following three quality
grades:
Grade 1: local headend / remote headend
Grade 2: hub headend
Grade 3: MATV headend / individual reception headend
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Practical experience has shown these types meet most of the technical requirements necessary
for supplying a minimum signal quality to the subscribers. This classification shall not be
considered as a requirement but as the information for users and manufacturers on the
minimum quality criteria of the material required to install networks of different sizes. The system
operator has to select appropriate material to meet the minimum signal quality at the
subscriber's outlet and to optimise cost performance, taking into account the size of the network
and local circumstances.
Terrestrial and/or
Satellite Reception
Remote
Headend
Terrestrial and
Satellite Reception
Local
Headend
Hub
Headend
Figure 1 - Example of headends
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OUTDOOR INDOOR
Demodulator Transcoder Modulator
Antennas
+
Preamplifier
VHF/UHF
FM Radio, DAB
f
2
f
1
Pilot
Data
Video Encoder
Audio
Polarizer
f
2
Video
f
1
Audio
LNB
M
VHF/UHF
FM-TV
1st SAT IF
ETS 300 158
ETS 300 249
FM-TV
1st SAT IF
f
2
f
1
Figure 2 - Example of headend
Polarmount
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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 1995 Part 2: Electromagnetic compatibility for equipment
+ A1 1997
EN 50083-3 1998 Part 3: Active wideband equipment for coaxial cable networks
EN 60068/HD 323 series Environmental testing/Basic environmental testing procedures
(IEC 60068 series)
EN 60130-9 2000 Connectors for frequencies below 3 MHz – Part 9: Circular
connectors for radio and associated sound equipment
(IEC 60130-9:2000)
EN 60244-5 1994 Methods of measurement for radio transmitters
Part 5: Performance characteristics for television transmitters
(IEC 60244-5:1992)
EN 60417-1 1999 Graphical symbols for use on equipment
Part 1: Overview and application (IEC 60417-1:1998)
EN 60417-2 1999 Graphical symbols for use on equipment
Part 2: Symbol originals (IEC 60417-2:1998)
EN 60529 1991 Degrees of protection provided by enclosures (IP Code)
+ corr. May 1993 NOTE: Basic Safety Publication
(IEC 60529:1989)
EN 300 163 1998 Television systems - NICAM 728: Transmission of two-channel
V1.2.1 digital sound with terrestrial television systems B, G, H, I, K1 and L
EN 300 473 1997 Digital Video Broadcasting (DVB) - Satellite Master Antenna
V1.1.2 Television (SMATV) distribution systems
HD 134.2 S2 1984 Radio frequency connectors - Part 2: Coaxial unmatched connector
(IEC 60169-2:1965 + A1:1982)
HD 571 S1 1990 General principles for the creation of graphical symbols for use on
equipment (IEC 60416:1988)
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ETS 300 158 1992 Satellite Earth Stations and Systems (SES) - Television Receive
Only (TVRO-FSS) Satellite Earth Stations operating in the
11/12 GHz FSS bands
ETS 300 249 1993 Satellite Earth Stations and Systems (SES) - Television Receive
Only (TVRO) equipment used in the Broadcasting Satellite Service
(BSS)
ETS 300 457 1995 Satellite Earth Stations and Systems (SES) - Test methods for
Television Receive Only (TVRO) operating in the 11/12 GHz
frequency bands
IEC 60169-8 1978 Radio frequency connectors -- Part 8: RF coaxial connectors with
inner diameter of outer conductor 6,5 mm (0,25 in) with bayonet
lock - Characteristic impedance 50 ohms (type BNC)
CCIR Rec. 468 Measurement of audio frequency noise in broadcasting and in
sound recording systems
ITU-T Rec. J.61 06/90 Transmission performance of television circuits designed
for use in international connections
(Formerly ITU-R Rec. 567-3)
ITU-T Rec. J.101 06/90 Measurement methods and test procedures for teletext signals
(Formerly ITU-R Rec. 720)
CCIR Report 624 Characteristics of television systems
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this standard, the following definitions apply.
3.1.1
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.
3.1.2
hub headend
a headend used to feed the entire operating network in the service area
3.1.3
local headend
a headend which is directly connected to the system trunk feeders or to a short haul "trunk
feeder replacement" link
3.1.4
remote headend
a headend from which signals are delivered to a local headend via a long-distance
terrestrial link
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3.1.5
MATV headend
a headend used in blocks of flats and in built-up sites to feed TV channels and FM radio
channels into the house network or the spur network.=
3.1.6
Satellite Master Antenna Television system (SMATV)
a system which is designed to provide sound and television signals to the households of a
building or group of buildings. Two system configurations are defined in EN 300 473 as
follows:
• SMATV system A, based on transparent transmodulation of QPSK satellite signals into
QAM signals to be distributed to the user
• SMATV system B, based on direct distribution of QPSK signals to the user, with two
options:
- SMATV-IF distribution in the satellite IF band (above 950 MHz)
- SMATV-S distribution in the VHF/UHF band, for example in the extended
S-band (230-470 MHz)
3.1.7
headend for individual reception
a headend supplying an individual household. This type of installation may include one or
more system outlets
3.1.8
antenna preamplifier
an amplifier (often a low noise type) associated with an antenna
3.1.9
frequency converter
a device for changing the carrier frequency of one or more signals
3.1.10
combiner
a device in which the signals arriving at two or more input ports are fed to a single output
port
NOTE Some forms of this device may be used in the reverse direction as splitters.
3.1.11
decibel ratio
ten times the logarithm of the ratio of two quantities of power P to P i. e.
1 2
,
P
1
10lg (dB)
P
2
3.1.12
standard reference power and voltage
in cable networks the standard reference power P is 1/75 pW
0
NOTE This is the power dissipated in a 75 Ohm resistor with a voltage drop of 1µV across it.
RMS
The standard reference voltage U is 1 µV.
0
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3.1.13
level
the level of any power P is the decibel ratio of that power to the standard reference power
1
P , i.e.
0
P
1
10lg
P
0
The level of any voltage U is the decibel ratio of that voltage to the standard reference
1
voltage U , i.e.
0
U
1
20lg
U
0
This may be expressed in decibels (relative to 1 µV in 75 Ω) or more simply in dB(µV) if
there is no risk of ambiguity.
3.1.14
image carrier power
"power", in relation to a vision-modulated carrier, is defined as the power at the peak of the
modulation envelope (i.e. the maximum RMS voltage squared, divided by the resistance)
3.1.15
attenuation
the ratio of the input power to the output power of an equipment or a system, usually
expressed in decibel
3.1.16
gain
the ratio of the output power to the input power of any equipment or system, usually
expressed in decibel
3.1.17
automatic gain control (AGC)
the automatic control of a device to maintain the level of the signal at its output constant,
using the signal to be controlled as the control stimulus
3.1.18
amplitude frequency response
the gain or losses of an equipment or system plotted against frequency
3.1.19
intermodulation
the process whereby the non-linearity of equipment in a system produces spurious output
signals (called intermodulation products) at frequencies which are linear combinations of
those of the input signals
3.1.20
carrier-to-intermodulation ratio
the difference in decibels between the carrier level at a specified point in a system or in an
equipment and the level of a specified intermodulation product or combination of products
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3.1.21
carrier-to-noise ratio
the difference in decibels between the vision or sound carrier level at a given point in the
system and the noise level at that point (measured within a bandwidth appropriate to the
television or radio system in use)
3.1.22
well-matched
the matching condition when the return loss of the equipment complies with the
requirements of Table 1 of EN 50083-3
NOTE Through mismatching of measurement instruments and the measurement object measurement errors are
possible. Comments to the estimation of such errors are given in Annex E.
3.1.23
subscriber equipment
equipment at the subscriber premises such as receivers, tuners, decoders, video recorders
3.1.24
out of band emissions
emissions on a frequency or on frequencies immediately outside the necessary bandwidth
which results from the modulation process, but excluding spurious emissions
3.1.25
spurious emissions
emissions on a frequency or frequencies which are outside the necessary bandwidth and
the level of which may be reduced without affecting the corresponding transmission of
information. Spurious emissions include harmonic emissions, parasitic emissions,
intermodulation products and frequency conversion products but exclude out of band
emissions
3.1.26
unwanted emissions
consist of spurious emissions and out of band emissions
3.2 Symbols
Symbols Terms Symbols Terms
voltmeter amperemeter
V A
variable Generator variable attenuator
G
dB
Device under Test oscilloscope
DUT
high pass filter low pass filter
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Symbols Terms Symbols Terms
frequency converter amplifier
f
2
f
1
splitter
pilotgenerator
modulator demodulator
adjustable AC voltage source detector with LF-amplifier
ground variable resistor
3.3 Abbreviation
AC alternating current
AF audio frequency
AGC automatic gain control
ALC automatic level control
AM amplitude modulation
BSS broadcast satellite services
CATV community antenna television (system)
CH channel
C/N carrier to noise (ratio)
CW continuous wave
DAB digital audio broadcasting
DG peak-to-peak differential gain
PP
DPH peak-to-peak differential phase
PP
DSR digital satellite radio
DUT device under test
EMC electromagnetic compatibility
FM frequency modulation
FSS fixed satellite services
HP high pass
IF intermediate frequency
IP international protection
ITS interval test signal
LF low frequency
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LNC low noise converter
LP low pass
LUM NL luminance non-linearity
MATV master antenna television (system)
MPEG motion picture experts group
MTBF meantime between failure
NICAM near-instantaneously companded audio multiplex
NF noise figure
PAL phase alternating line
QAM quadrature amplitude modulation
Q grade(s) quality grade(s)
QPSK quadrature phase shift keying
RF radio frequency
RMS root mean square
SAT IF (1st) satellite intermediate frequency
SECAM Séquenciel couleur a mémoire
SMATV satellite master antenna television (system)
S/N signal to noise (ratio)
TV television
TVRO television receive only (system, .)
UHF ultra high frequency
VHF very high frequency
VSB-IF vestigial sideband intermediate frequency
NOTE Only the abbreviations used in the English version of this part of EN 50083 are mentioned in this subclause.
The German and the French versions of this part may use other abbreviations. Refer to 3.3 of each language version
for details.
4 Methods of measurement
4.1 Single-channel intermodulation
Specifications for channel amplifier / frequency converter
Frequencies and levels of test carriers as shown in Figure 3 simulate a colour television
transmission where f , f and f respectively correspond to vision carrier, colour subcarrier and
a b c
sound carrier. The most significant intermodulation products are:
P3 = f + f - f
f a b c
P3 = f + f - f
g a c b
The carrier levels for different television systems are given in Table 1.
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Table 1 - Test signal levels in decibels relative to reference level
System B, G, H, I L
Test signal
Vision carrier (f)-8 0
a
Colour subcarrier (f)-17 0
b
Sound carrier (f)-10 0
c
Reference level
f f f
Fundamental
a b c
P3 P3
third order f g
Figure 3 - Frequencies and levels of test carriers
NOTE Levels of measuring signals are to be adjusted as in Table 1.
4.2 Three-carrier intermodulation measurement
Specifications for the measurement of three-carrier intermodulation on sub-band, full-band and
multi-band amplifiers or multi channel frequency converters
In television band amplifiers the simultaneous transmission of multi channel programming may
cause mutual interference between vision carriers through crossmodulation. The carrier-to-
crossmodulation distortion ratio is defined as the difference between the level of a given test
carrier and the level of the crossmodulation products produced by interfering signals and falling
near that test carrier.
This method of measurement is used to simulate transfer of modulation between two television
signals. The test carrier having the frequency f is an unmodulated wanted signal, while the
a
carriers having the frequencies f and f represent the sidebands of a one-hundred percent
b c
amplitude modulated (AM) interfering signal (Table 2 and Figure 4).
Carrier-to-interfer-
ence ratio
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Table 2 - Test signal levels in decibels relative to reference level
Test signal
Test frequency (f)0
a
Interfering frequency (f)-6
b
Interfering frequency (f)-6
c
Reference level
f f f
a b c
f -2 MHz f +2 MHz
a a
2 MHz
Figure 4 - Test carrier and interfering products in the passband
The carriers having the frequencies f , f and f shall be varied over the entire frequency range.
a b c
NOTE If the equal carrier method of measurement as described in subclauses 4.2.2 and 5.11.2 of EN 50083-3 is
used, the output level giving the appropriate signal-to-distortion ratio must be increased by 6 dB.
4.3 Two carrier intermodulation measurements for second and third order
products
The two carrier method is applicable to the measurement of the ratio of the carrier to a single
intermodulation product at a specified point within a cable network. The method can also be
used to determine the intermodulation performance of individual items of equipment.
Second-order products are encountered only in wideband equipment and systems covering
more than one octave, and can be measured using two signals.
Third-order products are encountered in both wideband and narrow-band equipment and
systems and, depending on the type, can also be measured using two signals.
Carrier-to-
interference
ratio
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Intermodulation products with test signals at frequencies f and f (Figure 5)
a b
Second order (see note): P2 = f - f
a b a
P2 = f + f
b a b
Third order: P3 =2f - f where 2f > f
a a b a b
P3 = f - 2f where 2f < f
a b a a b
P3 =2f - f
b b a
P3 =2f + f
c a b
P3 =2f + f
d b a
NOTE : Not applicable to narrow band equipment unless the frequency range covered by the equipment is such
that 2f < f .
min max
Signal levels
The two test carriers shall be set to the reference level.
Reference level
f f
Fundamental
a b
P2
P2
b
Second order a
P3
P3 b P3 P3
Third order a c d
Figure 5 - An example showing products formed when 2f > f
a b
NOTE The sequence of the intermodulation products will depend on the fundamental frequency chosen.
4.4 Carrier-to-spurious signal ratio at the output
4.4.1 Carrier-to-spurious signal ratio at the output of equipment for AM-TV systems
Carrier-to-spurious signal ratio in the output, out of channel 40 . 862 MHz
The carrier levels are given in Table 3.
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Table 3 - Test signal levels in decibels relative to reference level
System B/G/I L
Test signal
Vision carrier (f)0 0
a
Sound carrier (f)-10 0
b
Reference level
> 60 dB
CH-1 CH CH+1
f f
a b
f f
u w
f f
x y
f = 2f - f ; f = 2f - f
x a b y b a
f ,f are examples for all other spurious outputs
u w
NOTE: for exception: If for channel processing in CH-1 and CH+1
the difference between the intermodulation products fx and fy and
the reference level is less than 60 dB, the device shall be marked
with the note:
*Not suitable for adjacent channel operation
Figure 6 - Carrier-to-spurious signal ratio in the output
4.4.2 Carrier-to-spurious signal ratio at the output of equipment for FM-TV systems
Carrier-to-spurious signal ratio at the output of equipment for FM-TV systems, out of channels
and in channels between 950 MHz and 3 000 MHz.
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Reference level
≥ 35 dB
CH-n CH-1 CH CH+1 CH+m
f f
x b
f f f
z y a
Figure 7 - Carrier-to spurious signal ratio at the output
f , f and f are intermodulation products between f and f or with other signals occuring in the
x y z a b
system like oscillator frequency signals. f is varied within the whole transmission range
b
assigned to the
...
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