Impairment Table (Digital Carrier)
7.1.4.2 Graph Mode
The graph mode displays the
Adaptive Equalizer Stress
. The adaptive equalizer graph is a useful tool for troubleshooting linear
distortion.
Adaptive Equalization
Modern Cable Modems, Set-top-boxes and Cable Modem Termination Systems (CMTS) use advanced Adaptive Equalizer
technology to compensate for complex in-channel frequency response impairments caused by micro-reflections, amplitude ripple
and group delay occurring in the cable network. Signals in a cable system can arrive at the receiver before or after the desired
signal. Signals normally arriving afterwards are either reflections or micro-reflections.
Rather than equalizing the entire upstream or downstream RF frequency spectrum, an adaptive equalizer adjusts its characteristics
based on a single digitally modulated QAM carrier only as channel conditions change. This process maximizes or greatly improves
the Modulation Error Ratio (MER) in the forward or reverse path.
Impairment Graph (Adaptive Equalizer)
CX380C User Manual RevA00
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