This Technical Specification is applicable to the method of nonlinearity measurement for active cable network equipment which carry a digital channel load in the return path. The digital channel load is represented by standard DVB-C signals. The method of measurement of the maximum operating output level takes account of a full channel load in the return path frequency range although different applications of return path amplifiers with partial channel load or single channel load are also in practical use. The maximum operating output level for applications with reduced channel loads could be derived from the result with a full channel load by applying a given calculation formula.<\/p>\n
The method considers the specific signal form and behaviour of digitally modulated signals and can be applied in the return path frequency range (5 MHz to 65 MHz) as well as in the extended return path frequency range (5 MHz to 85 MHz) according to EN 60728-10.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 5<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope 2 Normative references 3 Terms, definitions, symbols and abbreviations 3.1 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | Figure 1 \u2212 Interrelation between different MER contributions <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 3.2 Symbols <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 3.3 Abbreviations 4 Method of measurement of the maximum operating output level in the return path 4.1 General 4.1.1 Channel load and modulation format 4.1.2 Return path frequency ranges 4.1.3 Applied limit values <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4.2 Measurement parameters for full channel load (N = 6 or N = 8) Table 1 \u2012 Measurement parameters for full channel load 4.3 Equipment required <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.4 Connection of the equipment Figure 2 \u2013 BER\/MER measurement test configuration 4.5 Measurement procedure <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4.6 Presentation of the measurement results 4.7 Maximum operating output level for reduced channel loads <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Annex A (normative) Null packet and PRBS definitions A.1 Null packet definition <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Table A.1 \u2013 Null-transport-stream packet definition A.2 PRBS definition <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Annex B (informative) Calculation formula for the maximum operating output level for reduced channel loads B.1 General B.2 Measurement results as basis for calculation formula for reduced channel loads Figure B.1 \u2212 Results of measurements with full, partial and single channel load <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | B.3 Calculation formula for median value Table B.1 \u2212 Calculated median values B.4 Calculation formula for worst-case value Table B.2 \u2212 Calculated worst-case values <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Cable networks for television signals, sound signals and interactive services – Active wideband equipment for cable networks. Methods of measurement of the maximum operating output level in the return path<\/b><\/p>\n |