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BS EN 60728-3:2011

BS EN 60728-3:2011

$198.66

Cable networks for television signals, sound signals and interactive services – Active wideband equipment for cable networks

Published By Publication Date Number of Pages
BSI 2011 70
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This part of IEC 60728 lays down the measuring methods, performance requirements and data publication requirements for active wideband equipment of cable networks for television signals, sound signals and interactive services.

This standard

  • applies to all broadband amplifiers used in cable networks;

  • covers the frequency range 5 MHz to 3 000 MHz;

NOTE The upper limit of 3 000 MHz is an example, but not a strict value. The frequency range, or ranges, over which the equipment is specified, should be published.

  • applies to one-way and two-way equipment;

  • lays down the basic methods of measurement of the operational characteristics of the active equipment in order to assess the performance of this equipment;

  • identifies the performance specifications to be published by the manufacturers;

  • states the minimum performance requirements of certain parameters.

Amplifiers are divided into the following two quality levels:

Practical experience has shown that these types meet most of the technical requirements necessary for supplying a minimum signal quality to the subscribers. This classification is not a requirement but is provided to users and manufacturers for information about 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.

All requirements and published data are understood as guaranteed values within the specified frequency range and in well-matched conditions.

PDF Catalog

PDF Pages PDF Title
7 CONTENTS
11 INTRODUCTION
12 1 Scope
2 Normative references
14 3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
18 3.2 Symbols
19 3.3 Abbreviations
20 4 Methods of measurement
4.1 General
21 4.2 Linear distortion
Figures
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
22 Figure 2 – Measurement of return loss
23 4.3 Non-linear distortion
24 Figure 3 – Basic arrangement of test equipment for evaluation of the ratio of signal to intermodulation product
27 Figure 4 – Connection of test equipment for the measurementof non-linear distortion by composite beat
29 Tables
Table 1 – Correction factors where the modulation used is other than 100 %
31 Figure 5 – Connection of test equipment for the measurement of composite crossmodulation
33 Figure 6 – Carrier/hum ratio
34 Figure 7 – Test set-up for local-powered objects
Figure 8 – Test set-up for remote-powered objects
35 Figure 9 – Oscilloscope display
36 4.4 Automatic gain and slope control step response
Figure 10 – Time constant T
37 Figure 11 – Measurement of AGC step response
38 4.5 Noise figure
Figure 12 – Measurement of noise figure
39 4.6 Crosstalk attenuation
40 Figure 13 – Measurement of crosstalk attenuation for loop trough ports of multi-switches
41 4.7 Signal level for digitally modulated signals
4.8 Measurement of composite intermodulation noise ratio (CINR)
42 Figure 14 – Characteristic of the noise filter
Figure 15 – Test setup for the non-linearity measurement
Table 2 – Notch filter frequencies
44 4.9 Immunity to surge voltages
Figure 16 – Presentation of the result of CINR
45 5 Equipment requirements
5.1 General requirements
Figure 17 – Measurement set-up for surge immunity test
46 5.2 Safety
5.3 Electromagnetic compatibility (EMC)
5.4 Frequency range
5.5 Impedance and return loss
47 5.6 Gain
5.7 Flatness
Table 3 – Return loss requirements for all equipment
48 5.8 Test points
5.9 Group delay
5.10 Noise figure
5.11 Non-linear distortion
49 5.12 Automatic gain and slope control
5.13 Hum modulation
5.14 Power supply
50 5.15 Environmental
5.16 Marking
51 5.17 Mean operating time between failure (MTBF)
5.18 Requirements for multi-switches
52 5.19 Immunity to surge voltages
Table 4 – Parameters of surge voltages for different degrees of testing levels
Table 5 – Recommendations for degree of testing levels
53 Annex A (informative) Derivation of non-linear distortion
55 Annex B (normative) Test carriers, levels and intermodulation products
Figure B.1 – An example showing products formed when 2fa > fb
56 Figure B.2 – An example showing products formed when 2fa < fb
Figure B.3 – Products of the form fa ± fb ± fc
57 Annex C (normative) Checks on test equipment
58 Annex D (informative) Test frequency plan for composite triple beat (CTB), composite second order (CSO) and crossmodulation (XM) measurement
Table D.1 – Frequency allocation plan
59 Annex E (informative) Measurement errors which occur due to mismatched equipment
Figure E.1 – Error concerning return loss measurement
Figure E.2 – Maximum ripple
60 Annex F (informative) Examples of signals, methods of measurement and network design for return paths
Figure F.1 – Spectrum of a QPSK-modulated signal
61 Table F.1 – Application of methods of measurement in IEC 60728-3for return path equipment
Table F.2 – Application of methods of measurement in IEC 60728-6for return path equipment
62 Figure F.2 – Measurement of non-linearity using wideband noise
63 Figure F.3 – Network used in the design example
64 Figure F.4 – A test result measured from a real 20 dB return amplifier
65 Figure F.5 – The CINR curve of one amplifier is modified to represent the CINR of the whole coaxial section of the network
66 Figure F.6 – The CINR of an optical link as a function of OMI, example
67 Bibliography

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BS EN 60728-3:2011
$198.66