1
Scope
2 Informative references
3 Terms and definitions
4 Abbreviations
5 Objective methods for measurements
of parameters in the transmission of digital cable television signals
5.1 End to end measurement of PSK, QAM
modulated television signals
5.1.1 Mutual isolation between system outlets
5.1.2 Amplitude response within a channel
5.1.3 RF carrier power
5.1.4 RF noise power
5.1.5 Carrier to Noise Ratio (C/N)
5.1.6 Bit Error Ratio (BER)
5.1.7 BER versus Eb/No
5.1.8 Noise margin
5.1.9 Modulation Error Ratio (MER)
5.1.10 Signal to noise ratio (S/N)
5.1.11 Target Error Vector (TEV)
5.1.12 RF phase jitter
5.1.13 Echoes (mask for a measurement equalizer)
Annex A – End-to-End measurement of OFDM modulated
television signals
A.1 End to End measurement of OFDM
television signals
A.1.1 Mutual isolation between system outlets
A.1.2 Signal level
A.1.3 Carrier Bandwidth
A.1.4 C/N synchronization limit
A.1.5 C/N versus BER
A.2 BER measurement of OFDM television
signals
A.2.1 BER versus inter-modulation
A.2.2 BER versus echoes
A.2.3 BER versus hum modulation
A.2.4 BER versus phase jitter
Appendix I – Notes for measurement
I.1 RF measurement units
I.2 Precautions for measurement of RF
signal power
I.2.1 Measurements using a power meter
I.2.2 Measurements using a spectrum analyser.
I.3 Precautions for measurement of RF
noise power
I.3.1 With a Power Meter
I.3.2 With a Spectrum Analyser
I.4 Noise proximity corrections
I.5 Approximation of measurements for
average power and carrier to noise
I.5.1 Measurement with a spectrum analyser that does not include density
spectrum measurement capability
I.5.2 Measurement with a spectrum analyser that does include density spectrum
measurement capability
I.5.3 Measurement with a spectrum analyser that includes density spectrum
measurement capability with normalization to any bandwidth
I.5.4 In service carrier to noise measurements
I.6 Other procedures for average power
measurements
I.7 BER measurements before FEC
decoder (gross rate and net rate)
Appendix II – Harmonics disturbance to noise margin
measurement
Appendix III – Mutual interference between analogue and
digital signals
III.1 Mutual interference between
analogue and digital signals
III.1.1 Interference to NTSC analogue signals from 64‑QAM digital signals
III.1.2 Interference to
64‑QAM digital signals from NTSC analogue signals