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Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
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Chapter4 Connecting the Cisco uBR7225VXR Router to the Cable Headend
Measuring the Downstream RF Signal
Figure4-14 Measuring the IF Signal on a Spectrum Analyzer in CATV Mode—DigitalChannel
Power Screen
Step6 Using the spectrum analyzer’s reference level control, adjust the amplitude of the displayed signal until
the shape of the signal is clearly distinguishable as a digitally modulated carrier, as shown in
Figure 4-15.
Figure4-15 Measuring the IF Signal on a Spectrum Analyzer in CATV Mode—AdjustedDigital
Channel Power Screen
Note The IF channel power in Figure 4-15 is +33 dBmV, as displayed on the spectrum analyzer.
Step7 Select the video averaging feature. Your spectrum analyzer should display a signal similar to the one
shown in Figure4-16.