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Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide
OL-5421-03
Chapter 4 Connecting the Cisco uBR7200 Series Router to the Cable Headend
Measuring the Downstream RF Signal
Step 5
Enter a digital channel to measure and select digital channel power. Your spectrum analyzer will display
a signal similar to the one shown in
Figure 4-26
.
Figure 4-26
Measuring the IF Signal on a Spectrum Analyzer in CATV Mode—Digital Channel
Power Screen
Step 6
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 4-27
.
Figure 4-27
Measuring the IF Signal on a Spectrum Analyzer in CATV Mode—Adjusted Digital
Channel Power Screen
Note
The IF channel power in
Figure 4-27
is +33 dBmV, as displayed on the spectrum analyzer.
Step 7
Select the video averaging feature. Your spectrum analyzer should display a signal similar to the one
shown in
Figure 4-28
.
