Troubleshooting guide

5-12
Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
OL-5169-01
Chapter 5 Troubleshooting DOCSIS Networks
Measuring RF Signals
Step 5 Measure the IF signal using the channel power option on your spectrum analyzer. Set your channel
spacing and your channel bandwidth to 6 MHz. Your analyzer should display a signal similar to the one
shown in Figure 5-2.
Figure 5-2 Measuring the IF Channel Power
Step 6
Select the video averaging feature. Your spectrum analyzer should display a signal similar to the one
shown in Figure 5-3.
Figure 5-3 Measuring the IF Channel Power Using Video Averaging
Note The peak-to-valley flatness can be verified using the spectrum analyzer's video averaging feature. Be
aware, however, that amplitude values registered while in the video averaging mode are typically around
2.5 dB below the actual channel power.