IEC 60728-10:2005
(Main)Cable networks for television signals, sound signals and interactive services - Part 10: System performance of return paths
Cable networks for television signals, sound signals and interactive services - Part 10: System performance of return paths
deals 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.
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INTERNATIONAL IEC
STANDARD 60728-10
Second edition
2005-06
Cable networks for television signals,
sound signals and interactive services –
Part 10:
System performance of return paths
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INTERNATIONAL IEC
STANDARD 60728-10
Second edition
2005-06
Cable networks for television signals,
sound signals and interactive services –
Part 10:
System performance of return paths
IEC 2005 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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International Electrotechnical Commission
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For price, see current catalogue
– 2 – 60728-10 IEC:2005(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .8
3 Terms, definitions, symbols and abbreviations.9
3.1 Terms and definitions .9
3.2 Symbols .11
3.3 Abbreviations .11
4 Methods of measurement .12
4.1 Set-up of the network .12
4.2 Measurement of signal level .14
4.3 Measurement of amplitude response variation.15
4.4 Measurement of signal to noise ratio (S/N) .16
4.5 Measurement of multiple interference.18
4.6 Measurement of impulse noise .19
4.7 Measurement of echo ratio .20
4.8 Measurement of group delay variation .21
4.9 Measurement of frequency error.22
4.10 Measurement of bit error rate (BER).23
5 System performance requirements .24
5.1 General .24
5.2 Analogue parameters influencing system performance .26
5.3 General requirements.27
5.4 Specific system performance requirements .27
6 System performance recommendations .28
6.1 Proposal for the use of the return path bandwidth.28
Annex A (informative) System performance requirements for different modulation
techniques .30
Annex B (normative) Correction factors for noise .31
Bibliography.33
Figure 1 – Reference points of an active return path system (example).7
Figure 2 – Procedure for setup and adjustment of an upstream plant .13
Figure 3 – Arrangement of test equipment for measurement of amplitude response
variation.16
Figure 4 – Arrangement of test equipment for measurement of echo ratio.21
Figure 5 – Test set-up for frequency stability measurement .22
Figure 6 – Principle of BER measurement.23
Figure 7 – Upstream signals affecting downstream signals .25
Figure 8 – Downstream signals affecting upstream signals .25
Figure 9 – Upstream signals of service 1 affecting upstream signals of a different
service (e.g. service 2) .26
60728-10 IEC:2005(E) – 3 –
Figure 10 – Upstream signals of a specific service (e.g. service 2) affecting upstream
signals of the same service.26
Figure 11 – Identification of the most common sub-bands within the return path band
with limited transmission quality.29
Figure B.1 – Noise correction factor (CF) versus measured level difference (D) . .32
dB dB
Table 1 – Characterisation criteria for downstream and upstream operations .12
Table 2 – Examples of the Nyquist bandwidth of digitally modulated carriers .14
Table 3 – System performance requirements using a reference signal according to
ES 200 800 (QPSK Grade C) .28
Table 4 – Return path frequency ranges .28
Table 5 – Reasons for quality reduction in sub-bands of the return path .29
Table A.1 – System performance requirements for different modulation techniques for
–4
BER = 10 .30
Table B.1 – Noise correction factor .31
– 4 – 60728-10 IEC:2005(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CABLE NETWORKS FOR TELEVISION SIGNALS,
SOUND SIGNALS AND INTERACTIVE SERVICES –
Part 10: System performance for return paths
FOREWORD
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International Standard IEC 60728-10 has been prepared by technical area 5: Cable networks
for television signals, sound signals and interactive services of IEC technical committee 100:
Audio, video and multimedia systems and equipment.
This second edition cancels and replaces the first edition published in 2001 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• New measurement method for amplitude response variation, 4.3
• Additional recommendations to documentation of measurement results in 4.5.6, 4.6.5.
• New subclause for measurement of group delay variation, 4.8
60728-10 IEC:2005(E) – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
100/948FDIS 100/978/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 60728 consists of the following parts, under the general title Cable networks for television
signals, sound signals and interactive services:
Part 1: Methods of measurement and system performance
Part 2: Electromagnetic compatibility for equipment
Part 3: Active coaxial wideband distribution equipment (this publication)
Part 4: Passive coaxial wideband distribution equipment
Part 5: Headend equipment
Part 6: Optical equipment
Part 7-1: Hybrid fibre coax outside plant status monitoring – Physical (PHY) layer
specification
Part 7-2: Hybrid fibre coax outside plant status monitoring – Media access control (MAC)
layer specification
Part 7-3: Hybrid fibre coax outside plant status monitoring – Power supply to transponder
interface bus (PSTIB) specification
Part 9: Interfaces for CATV/SMATV headends and similar professional equipment for
DVB/MPEG-2 transport streams
Part 10: System performance of
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