19
User Guide
Micro-reflections longer than 4.5 microseconds rarely occur in conventional cable television systems. Moreover very
low-level micro-reflections (e.g., -40dB) longer than 4.5 microseconds may not be measured reliably. Therefore,
microreflections longer than 4.5 microseconds shall be considered under item 4 (of this table) as a contributor to
C/(N+I)
14. Burst Noise
Not longer than 25 µs at 10-Hz repetition rate
15. Carrier level at the terminal input
64 QAM: -15 dBmV to + 15 dBmV
256 QAM: -12 dBmV to +15 dBmV
Analog Visual Carrier (c):
0 dBmV to +15 dBmV
Analog Aural Carrier:
-10 dBc to
–17 dBc
Nominal Relative Carrier Power Levels
Analog channel 0 dBc (reference level)
QAM FAT -5 ± 2 dBc
QPSK FDC -8 ± 5 dBc
QAM FAT -10 ± 2 dBc
