BS EN 60728-10:2014
$198.66
Cable networks for television signals, sound signals and interactive services – System performance for return paths
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 58 |
IEC 60728-10:2014 specifies the transparent return path of cable networks operated in the frequency range between 5 MHz and 85 MHz or parts thereof. The upper frequency limit of the return path is reduced to 65 MHz where FM radio signals are transmitted in a cable network. Higher frequencies may be used in fibre based networks. This third edition cancels and replaces the second edition published in 2005 and constitutes a technical revision. It includes the following changes: – update on the state-of-the-art of return path transmission in cable networks; – provisions for DOCSIS 3.0 and EuroDOCSIS 3.0 transmission standards; – revision of subclause 4.3 on measurement of channel level; – new subclause 4.12 for method of measurement of noise power ratio (NPR) on return paths; – new subclause 4.13 for 10-tone measurements; – new subclause 4.14 for method of measurement of modulation error ratio (MER); – revision of subclause 5.2 on analogue parameters influencing system performance.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | English CONTENTS |
| 11 | INTRODUCTION |
| 12 | 1 Scope 2 Normative references |
| 13 | 3 Terms, definitions, symbols and abbreviations 3.1 Terms and definitions |
| 16 | 3.2 Symbols |
| 17 | 3.3 Abbreviations 4 Methods of measurement 4.1 General |
| 18 | 4.2 Set-up of the network 4.3 Measurement of channel level 4.3.1 General 4.3.2 Equipment required Figures Figure 1 – Reference points of an active return path system (example) |
| 19 | 4.3.3 Connection of the equipment 4.3.4 Measurement procedure for digitally modulated carriers Tables Table 1 – Examples of the Nyquist bandwidth of digitally modulated carriers |
| 20 | 4.3.5 Measurement procedure for intermittent digitally modulated carriers Figure 2 – Time domain representation of an upstream burst with marker on the preamble of the DOCSIS signal |
| 21 | 4.3.6 Presentation of the results 4.4 Measurement of amplitude response variation 4.4.1 Background 4.4.2 Equipment required 4.4.3 Connection of the equipment 4.4.4 Calibration of equipment Figure 3 – Arrangement of test equipment for measurement of amplitude response variation |
| 22 | 4.4.5 Method of measurement 4.4.6 Presentation of the results 4.5 Measurement of signal to noise ratio (SD,RF/N) 4.5.1 General 4.5.2 Equipment required 4.5.3 Connection of the equipment 4.5.4 Measurement procedure |
| 23 | 4.5.5 Presentation of the results 4.6 Measurement of multiple interference 4.6.1 General |
| 24 | 4.6.2 Equipment required 4.6.3 Connection of the equipment 4.6.4 Measurement procedure 4.6.5 Processing of the data 4.6.6 Presentation of the results |
| 25 | 4.7 Measurement of impulse noise 4.7.1 General 4.7.2 Equipment required 4.7.3 Connection of the equipment 4.7.4 Measurement procedure |
| 26 | 4.7.5 Processing of the data and presentation of the results 4.8 Measurement of echo ratio 4.8.1 General |
| 27 | 4.8.2 Equipment required Figure 4 − Echo rating graticule |
| 28 | 4.8.3 Connection of the equipment 4.8.4 Measurement procedure 4.8.5 Presentation of the results 4.9 Measurement of group delay variation Figure 5 – Arrangement of test equipment for measurement of echo ratio |
| 29 | 4.10 Measurement of frequency error 4.10.1 General 4.10.2 Equipment required 4.10.3 Connection of the equipment 4.10.4 Measurement procedure Figure 6 – Test set-up for frequency stability measurement |
| 30 | 4.10.5 Presentation of the result 4.11 Measurement of bit error ratio (BER) 4.11.1 General 4.11.2 Equipment required Figure 7 – Principle of BER measurement |
| 31 | 4.11.3 Connection of the equipment 4.11.4 Measurement procedure 4.11.5 Presentation of the results 4.12 Noise power ratio (NPR) measurement on return path 4.12.1 General |
| 32 | 4.12.2 Equipment required 4.12.3 Connection of the equipment Figure 8 – Band-pass and band-stop filters response Table 2 – Band-stop filter notch frequencies |
| 33 | 4.12.4 Measurement procedure Figure 9 – NPR test set up |
| 34 | 4.12.5 Presentation of the results 4.12.6 Recommended correction factors Figure 10 – NPR versus RF power density applied at input of optical transmitter and determination of OMI 100 % Figure 11 – Example of the frequency response of the optional band-pass filter |
| 35 | 4.12.7 Precautions during measurement 4.12.8 NPR dynamic range |
| 36 | 4.13 10-Tone measurement 4.13.1 General Figure 12 – Example of NPR dynamic range Figure 13 – Dynamic range plotted versus NPR |
| 37 | 4.13.2 Measurement principle 4.13.3 Measurement procedure Figure 14 – Alternative NPR measurement principle |
| 38 | 4.14 Modulation error ratio (MER) measurement on return path 4.14.1 General Figure 15 – Relationship between classical NPR method and multi-tone method |
| 39 | 4.14.2 Equipment required 4.14.3 Connection of the equipment 4.14.4 Measurement procedure Figure 16 – Test set-up for modulation error ratio (MER) measurement |
| 40 | 4.14.5 Presentation of the results 5 System performance requirements 5.1 General Figure 17 – Example of constellation diagram for a 64QAM modulation format |
| 41 | Figure 18 – Return path signals affecting forward path signals |
| 42 | Figure 19 – Forward path signals affecting return path signals Figure 20 – Return path signals of service 1 affecting return path signals of a different service (e.g. service 2) Figure 21 – Return path signals of a specific service (e.g. service 2) affecting return path signals of the same service |
| 43 | 5.2 Analogue parameters that influence the system performance |
| 44 | Table 3 – Summary of the requirements for MER according to ETSI EN 302 878-2, V.1.1.1 (2011-11), (clause 6.2.22.3.2) |
| 45 | 5.3 General requirements 5.3.1 Impedance 5.3.2 Maximum signal level 5.4 Specific system performance requirements |
| 46 | Table 4 – System performance requirementsfor different modulation techniques for BER = 10–4 |
| 47 | Table 5 – Comparison of system performance parameters given in Table 4 with those given in ETSI EN 302 878-2, V.1.1.1 (2011-11), specifications |
| 48 | 6 System performance recommendations – Return path bandwidth 6.1 Frequency allocation 6.2 Transmission quality in the return path frequency ranges Table 6 – Return path frequency ranges Table 7 – Reasons for quality reduction in sub-bands of the return path |
| 49 | Figure 22 – Identification of the most common sub-bands within the return path band with limited transmission quality |
| 50 | Annex A (normative) Correction factors for noise Table A.1 – Noise correction factor |
| 51 | Figure A.1 – Noise correction factor CFversus measured level difference D |
| 52 | Annex B (normative) Correction factor for a spectrum analyser |
| 53 | Annex C (normative) Null packet and PRBS definitions |
| 54 | Table C.1 – Null transport stream packet definition |
| 55 | Bibliography |
