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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 Upstream RF Signal
Figure4-26 Measuring the Upstream RF Signal—Setting the Resolution and Video Channel
Bandwidth
Tip The horizontal line passing through the center of the spectrum analyzer display in Figure 4-26 is the
trigger line.
Step6 Set the sweep value to 80 microseconds. Your spectrum analyzer should display a signal similar to the
one shown in Figure 4-27.
Note Be sure that your particular spectrum analyzer is capable of supporting sweep times as short as 80
microseconds.
Figure4-27 Measuring the Upstream RF Signal—Setting the Sweep Time Period
Step7 Position the trigger line on the spectrum analyzer so that it is roughly in the middle (approximately
halfway between the highest and lowest portions) of the upstream RF signal.