IEC 60728-3:2005

Cable networks for television signals, sound signals and interactive services - Part 3: Active wideband equipment for coaxial cable networks

lays down the measuring methods, performance requirements and data publication requirements for active coaxial wideband distribution equipment of cable networks for television and sound signals. applies to all broadband amplifiers used in cable networks and covers the frequency range 5 MHz to 3 000 MHz. It also applies to one-way and two-way equipment

General Information

• Status: Published
• Publication Date: 26-Jun-2005
• ICS: 33.060.40 - Cabled distribution systems
• ICS: 33.170 - Television and radio broadcasting
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 09-Dec-2010

Relations

• Revised: IEC 60728-3:2010 - Cable networks for television signals, sound signals and interactive services - Part 3: Active wideband equipment for cable networks
• Effective Date: 05-Sep-2023
• Revises: IEC 60728-3:2000 - Cabled distribution systems for television and sound signals - Part 3: Active coaxial wideband distribution equipment
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD 60728-3
Third edition
2005-06
Cable networks for television signals,
sound signals and interactive services –
Part 3:
Active wideband equipment for coaxial cable
networks
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the

60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.

Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,

edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the

base publication incorporating amendment 1 and the base publication incorporating

amendments 1 and 2.
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INTERNATIONAL IEC
STANDARD 60728-3
Third edition
2005-06
Cable networks for television signals,
sound signals and interactive services –
Part 3:
Active wideband equipment for coaxial cable
networks
 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: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
XA
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 60728-3  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 .13
3.3 Abbreviations .14
4 Methods of measurement .14
4.1 Linear distortion .15
4.2 Non-linear distortion .17
4.3 Automatic gain and slope control step response .32
4.4 Noise figure.34
4.5 Crosstalk attenuation.34
4.6 Signal level for digitally modulated signals .36
4.7 Method of measurement for non-linearity of return path equipment carrying
only digital modulated signals [Measurement of composite intermodulation
noise ratio (CINR)] .36
5 Equipment requirements.40
5.1 General requirements.40
5.2 Safety .40
5.3 Electromagnetic compatibility (EMC) .40
5.4 Frequency range .40
5.5 Impedance and return loss .40
5.6 Gain .41
5.7 Flatness .41
5.8 Test points .42
5.9 Group delay .42
5.10 Noise figure.42
5.11 Non-linear distortion .42
5.12 Automatic gain and slope control.43

5.13 Hum modulation .43
5.14 Power supply.44
5.15 Environmental .44
5.16 Marking .44
5.17 Mean operating time between failure (MTBF) .45
5.18 Requirements for multi-switches.45
Annex A (normative) Test carriers, levels and intermodulation products.46
Annex B (normative) Checks on test equipment .48
Annex C (informative) Test frequency plan for composite triple beat (CTB), composite
second order (CSO) and crossmodulation (XMOD) measurement .49
Annex D (informative) Measurement errors which occur due to mismatched equipment .50
Annex E (informative) Examples of signals, methods of measurement and network
design for return paths.52
Bibliography.59

60728-3  IEC:2005(E) – 3 –
Figure 1 – Maximum error a for measurement of return loss using VSWR-bridge with

directivity D = 46 dB and 26 dB test port return loss.16

Figure 2 – Measurement of return loss.16

Figure 3 – Basic arrangement of test equipment for evaluation of the ratio of signal to
intermodulation product .20

Figure 4 – Connection of test equipment for the measurement of non-linear distortion

by composite beat.23

Figure 5 – Connection of test equipment for the measurement of composite

crossmodulation.27

Figure 6 – Carrier/hum ratio.29
Figure 7 – Test set-up for local-powered objects.30
Figure 8 – Test set-up for remote-powered objects .30
Figure 9 – Oscilloscope display .31
Figure 10 – Time constant T .32
c
Figure 11 – Measurement of AGC step response .33
Figure 12 – Measurement of noise figure .34
Figure 13 – Measurement of crosstalk attenuation for loop trough ports of multi-switches.35
Figure 14 – Characteristic of the noise filter.38
Figure 15 – Test setup for the non-linearity measurement.38
Figure 16 – Presentation of the result of CINR .39
Figure A.1 – An example showing products formed when 2ƒ > ƒ .46
a b
Figure A.2 – An example showing products formed when 2ƒ < ƒ .47
a b
Figure A.3 – Products of the form ƒ ± ƒ ± ƒ .47
a b c
Figure D.1 – Error concerning return loss measurement .50
Figure D.2 – Maximum ripple .50
Figure E.1 – Spectrum of a QPSK-modulated signal .52
Figure E.2a – Loading with digital channels can be simulated with wideband noise.54
Figure E.2b – Non-linearity decreases the S/N at high levels .54
Figure E.3 – Network used in the design example.55
Figure E.4 – A test result measured from a real 20 dB return amplifier.56
Figure E.5 – The CINR curve of one amplifier is modified to represent the CINR of the
whole coaxial section of the network .57

Figure E.6 – The CINR of an optical link as a function of OMI, example.58

Table 1 – Correction factors where the modulation used is other than 100 %.25
Table 2 – Notch filter frequencies .37
Table 3 – Return loss requirements for all equipment .41
Table C.1 – Frequency allocation plan .49
Table E.1 – Application of methods of measurement in IEC 60728-3 for return path
equipment.53
Table E.2 – Application of methods of measurement in IEC 60728-6 for return path
equipment.53

– 4 – 60728-3  IEC:2005(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
CABLE NETWORKS FOR TELEVISION SIGNALS,

SOUND SIGNALS AND INTERACTIVE SERVICES –

Part 3: Active wideband equipment for coaxial cable networks

FOREWORD
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intereste
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