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Chapter 4
Connecting the Cisco uBR7225VXR Router to the Cable Headend
Figure 4-14
Using the spectrum analyzer's reference level control, adjust the amplitude of the displayed signal until
Step 6
the shape of the signal is clearly distinguishable as a digitally modulated carrier, as shown in
Figure
Figure 4-15
The IF channel power in
Note
Select the video averaging feature. Your spectrum analyzer should display a signal similar to the one
Step 7
shown in
OL-17309-01
Measuring the IF Signal on a Spectrum Analyzer in CATV Mode—Digital Channel
Power Screen
4-15.
Measuring the IF Signal on a Spectrum Analyzer in CATV Mode—Adjusted Digital
Channel Power Screen
Figure 4-15
Figure
4-16.
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
is +33 dBmV, as displayed on the spectrum analyzer.
Measuring the Downstream RF Signal
4-13
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Troubleshooting
