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BS EN IEC 60728-113:2023 – TC

BS EN IEC 60728-113:2023 – TC

$280.87

Tracked Changes. Cable networks for television signals, sound signals and interactive services – Optical systems for broadcast signal transmissions loaded with digital channels only

Published By Publication Date Number of Pages
BSI 2023 270
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IEC 60728-113:2023 is applicable to optical transmission systems for broadcast signal transmission that consist of headend equipment, optical transmission lines, in-house wirings and system outlets. These systems are primarily intended for television and sound signals using digital transmission technology. This document specifies the basic system parameters and methods of measurement for optical distribution systems between headend equipment and system outlets in order to assess the system performance and its performance limits. In this document, the upper signal frequency is limited to about 3 300 MHz. The purpose of this part of IEC 60728 is to describe the system specifications of FTTH (fibre to the home) networks for digitally modulated broadcast signal transmission. This document is also applicable to broadcast signal transmission using a telecommunication network if it satisfies the performance of the optical portion of the system defined in this document. This document describes RF transmission for fully digitalized broadcast and narrowcast (limited area distribution of broadcast) signals over FTTH, and introduces the xPON system as a physical layer media. The detailed description of the physical layer is out of scope of this document. The scope is limited to downstream RF video signal transmission over FTTH; IP transport technologies, such as IP Multicast and associate protocols, which require a two-way optical transmission system, are out of scope of this document. Some interference effects occurring between the telecommunication system and the broadcast system are addressed in Clause 7. IEC 60728-113:2023 cancels and replaces the first edition published in 2018 and IEC 60728-13-1:2017. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) IEC 60728-13-1, which deals with the bandwidth expansion for broadcast signal over FTTH systems, has been merged with this document; b) a table containing the digital signal level at the system outlet has been added.

PDF Catalog

PDF Pages PDF Title
162 undefined
165 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
168 English
CONTENTS
174 FOREWORD
176 INTRODUCTION
177 1 Scope
2 Normative references
178 3 Terms, definitions, graphical symbols and abbreviated terms
3.1 Terms and definitions
182 Tables
Table 1 – Level of RF signals
185 3.2 Graphical symbols
186 3.3 Abbreviated terms
187 4 Optical system reference model
4.1 Overview
4.2 Over-all FTTH system reference model
189 Figures
Figure 1 – Example of FTTH system for television and sound signal
190 4.3 Reference models for the optical systems for broadcast signal transmissions
4.3.1 Optical wavelength for FTTH system
4.3.2 Reference models
Table 2 – Optical wavelength for FTTH system
Table 3 – Frequency range
191 4.4 Specified performance points of the optical system
5 Preparation of measurement
5.1 Environmental conditions
5.1.1 Standard measurement conditions
Figure 2 – FTTH Cable TV system using one wavelength
Figure 3 – FTTH Cable TV system using two wavelengths
Figure 4 – Specified performance points of the optical system
192 5.1.2 Temperature and humidity
5.1.3 Setting up the measuring setup and system under test
5.1.4 AGC/ALC operation
5.1.5 Impedance matching between pieces of equipment
5.1.6 Standard operating condition
5.1.7 Standard signal and measuring equipment
193 5.2 Accuracy of measuring equipment
5.3 Source power
6 Methods of measurement
6.1 Measuring points and items
6.1.1 General
Table 4 – Measuring equipment
194 6.1.2 Measuring points
6.1.3 Measured parameters
Figure 5 – Typical optical video distribution system
195 6.2 General measurement requirement
6.2.1 General
6.2.2 Input specification
6.2.3 Standard measurement conditions
Table 5 – Measuring points and measured parameters
196 6.2.4 Precautions for measurements
6.3 Optical power
6.3.1 General
6.3.2 Measuring setup
Figure 6 – Test setup for optical power measurement using a wavelength filter
197 6.3.3 Measuring method
6.3.4 Precautions for measurement
6.3.5 Presentation of the results
Figure 7 – Test setup for optical power measuring using a WDM coupler
198 6.4 Optical wavelength
6.4.1 Introduction
6.4.2 Method of measurement
6.4.3 Presentation of the results
6.5 SINR (signal-to-intermodulation and noise ratio) below 1GHz
6.5.1 General
Figure 8 – Measurement of optical wavelength without a WDM coupler
Figure 9 – Measurement of optical wavelength using a WDM coupler
199 6.5.2 Measuring setup
6.5.3 Measuring conditions
6.5.4 Precautions for measurement
Figure 10 – Test setup for RF signal to intermodulation and noise ratio measurement
200 6.5.5 Presentation of the results
6.6 Relative intensity noise (RIN) of optical signal
6.6.1 General
6.6.2 Measuring setup
201 6.6.3 Measurement conditions
6.6.4 System RIN measuring method
Figure 11 – Test setup for RIN measurement
203 6.6.5 SINR calculation based on RIN value
6.6.6 Component RIN calculation
205 6.6.7 Example for calculating of SINR
Table 6 – Parameters used for the calculation of SINR
206 Table 7 – RF signal noise bandwidth
207 6.7 Optical modulation index
6.8 Signal-to-crosstalk ratio (SCR)
6.8.1 General
6.8.2 Equipment required
6.8.3 General measurement requirements
6.8.4 Procedure
Figure 12 – Test setup for signal to crosstalk measurement
208 6.8.5 Potential sources of error
6.8.6 Presentation of the results
6.9 RF signal-to-intermodulation and noise ratio (SINR) of satellite broadcast signals
6.9.1 General
209 6.9.2 Measuring setup
6.9.3 Equipment required
6.9.4 Measurement procedure
Figure 13 – Setup for the measurement of SINR for satellite broadcast signals
210 6.9.5 Presentation of the results
6.10 System BER (bit error ratio)
6.10.1 Overview
6.10.2 Connection of the equipment
Figure 14 – Test setup for BER measurement
211 6.10.3 Measurement procedure
6.10.4 Presentation of the results
6.11 SINR versus BER measurement
6.11.1 General
6.11.2 Connection of the equipment
Figure 15 – Test setup for SINR versus BER measurement procedure
212 6.11.3 Presentation of the results
Figure 16 – Extrapolation method of BER measurement
213 6.12 System noise margins
6.12.1 General
6.12.2 Connection of the equipment
Figure 17 – Example of SINR versus BER characteristics
214 6.12.3 Measurement procedure
6.12.4 Presentation of the results
Figure 18 – Test setup for system noise margin measurement
215 6.13 Modulation error ratio (MER)
6.13.1 General
6.13.2 Connection of the equipment
Figure 19 – Example of system noise margin characteristics
Figure 20 – Test setup for MER measurement
216 6.13.3 Measurement procedure
6.13.4 Presentation of the results
6.14 In-band frequency characteristics between optical transmitter and V-ONU
6.14.1 Overview
6.14.2 Measurement setup
Figure 21 – Example of result of MER measurement (64-QAM modulation format)
217 6.14.3 Measuring method
6.14.4 Presentation of the results
Figure 22 – Setup for the measurement of in-band frequency characteristics
Figure 23 – Measurement example of in-band frequency characteristics
218 7 Specification of the optical system for broadcast signal transmission
7.1 Digital broadcast system over optical network
7.2 RF signal levels at system outlet
Figure 24 – Performance specified points
219 7.3 RF signal-to-intermodulation and noise ratio and performance allocation
Table 8 – Digital signal levels at the system outlet
220 Table 9 – Minimum SINR (SDU case)
221 Table 10 – Minimum SINR (MDU case)
222 Table 11 – Minimum RF SINR requirements in operation
224 7.4 Relationship between RIN and SINR
7.4.1 Type of broadcast services
Table 12 – Types of broadcast services
225 7.4.2 Types of broadcast services and relative signal level
226 7.4.3 RIN performance requirements
Table 13 – Types of broadcast services and relative signal level
Table 14 – Minimum operational RIN values for digital broadcast servicesusing the frequency band below 1 000 MHz
227 Table 15 – Type of service and minimum operational RIN values for satellite services
228 7.5 Optical wavelength
Table 16 – Performance of optical wavelength and power
229 7.6 Frequency of source signal
7.7 Level difference between adjacent channels
230 Figure 25 – Permissible signal level of adjacent channels (ISDB-T, ISDBC and ISDBC2)
231 7.8 BER at headend input
7.9 MER
232 7.10 SINR specification for in-house and in-building wirings
Table 17 – Minimum MER Performance a for FTTH systems
233 Figure 26 – Section SINR for SDU wiring (specified by electrical signal)
Table 18– Section SINR for in-house/in-building wiring
234 7.11 In-band frequency characteristics
Figure 27 – Section SINR for MDU wiring (specified by electrical signal)
Figure 28 – Section SINR for MDU wiring (specified by optical signal)
Table 19 – In-band frequency characteristics specification
235 7.12 Electrical signal interference
Figure 29 – Signal level difference with 3rd order interference signal (ISDB-T)
Table 20 – Limits for in-channel electrical signal interference
236 Figure 30 – Signal level difference with 3rd order interference signal (ISDB-C 64QAM)
Figure 31 – Signal level difference with 3rd order interference signal (ISDB-C 256QAM)
Figure 32 – Level difference between signal and reflected (echo) signal (ISDB-T)
237 7.13 Crosstalk due to optical fibre non-linearity
Figure 33 – Level difference between signal and reflected (echo) signal (ISDB‑C 64QAM)
Figure 34 – Level difference between signal and reflected (echo) signal (ISDB‑C 256QAM)
238 7.14 Interference due to intermodulation noise caused by fibre non-linearity
7.15 Environmental conditions
Table 21 – Interference level due to fibre non-linearity
Table 22 – Environmental conditions
239 Annex A (informative)Actual service systems and design considerations
A.1 General
A.2 Multi-channel service system
A.2.1 General
Figure A.1 – Example of a multi-channel service system of one million terminals
240 A.2.2 Operating conditions
A.2.3 Operating environment
Figure A.2 – Example of a multi-channel service system of 2 000 terminals
Table A.1 – Operating conditions of a multi-channel service system
241 A.3 Re-transmission service system
A.3.1 General
A.3.2 Operating conditions
Figure A.3 – Example of re-transmission service system of 72 terminals
Figure A.4 – Example of re-transmission service system of 144 terminals
242 A.3.3 Operating environment
A.4 SINR calculation of optical network
Table A.2 – Operating conditions of re-transmission service system
243 A.5 System reference model
244 Table A.3 – Basic system parameters for multi-channeland re-transmission service systems
245 Figure A.5 – Model 1 system performance calculation
246 Figure A.6 – Model 4 system performance calculation
247 A.6 Hints for actual operation
A.6.1 Optimum operation
A.6.2 Key issues to be specified
248 Annex B (informative)BER extrapolation method
Figure B.1 – Extrapolation method of BER measurement
249 Figure B.2 – BER characteristics for 256-QAM, 1 024-QAM and 4 096-QAM(extrapolation method)
250 Annex C (informative)Optical system degradations
C.1 System degradation factors
Figure C.1 – Reflection model
251 C.2 Non-linear degradation
C.2.1 Degradation factors
C.2.2 Stimulated Brillouin scattering (SBS)
Figure C.2 – Degradation factors of optical transmission system
Figure C.3 – SBS generation image
252 C.2.3 Stimulated Raman scattering (SRS)
Table C.1 – Disturbance parameter of Raman crosstalk
253 Figure C.4 – Interference between two wavelengths
Figure C.5 – Simulation of SRS (OLT transmission power versus D/U)
254 Figure C.6 – Simulation of SRS (D/U in arbitrary unit versus fibre length)
Figure C.7 – Fibre length of the first peak of SRS D/U versus frequency
255 C.2.4 Self-phase modulation (SPM)
C.2.5 Cross-phase modulation (XPM)
Figure C.8 – GE-PON idle pattern spectrum (ISO/IEC/IEEE 8802-3:2017 1 000 Base‑PX)(62,5 MHz = 1 250 Mbps/20 bit)
256 Annex D (informative)Measurement of parameters (R, Id0, Ieq and G)required for RIN calculation
D.1 Measurement of the responsivity (R)
D.2 Measurement of dark current (Id0)
D.3 Measurement of equivalent noise current density (Ieq)
257 D.4 Measurement of gain (G)
Figure D.1 – Measurement of gain (G)
258 Annex E (informative)Measurement of peak and average signal levelsof digitally modulated signals
E.1 General
E.2 Peak and average power measurement using CCDF
259 Figure E.1 – Typical CCDF curves for OFDM and M-QAM signals
260 E.3 Measurement method of CCDF
E.3.1 General
E.3.2 Measurement procedure
Figure E.2 – CCDF measurement setup
261 E.3.3 Estimation of BER from the CCDF measurement result
Figure E.3 – CCDF measurement example
262 E.3.4 Examples of CCDF measurements
Figure E.4 – SER vs SINR performance in an AWGN channel
Figure E.5 – Example of CCDF measurements
263 E.4 Performance evaluation of the FTTH system
E.4.1 General
E.4.2 Evaluation procedure
Figure E.6 – Performance evaluation of digital optical signals in the FTTH system
Figure E.7 – CCDF measurement bandwidth
264 E.5 Potential sources of error
265 Annex F (informative)Clipping noise
Figure F.1 – Clipping effects in laser diode static curve (IL curve)
Figure F.2 – Clipping noise, zero span, sweep time 100 µs
266 Annex G (informative)Relation between SINR degradation and rain attenuation
G.1 Relation between SINR and G/T
268 Bibliography

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BS EN IEC 60728-113:2023 - TC
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