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Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02
Chapter 4 Connecting the Cisco uBR7225VXR Router to the Cable Headend
Measuring the Upstream RF Signal
Figure 4-38 Vector Signal Analyzer Plot of Upstream Data Burst (Preamble Only)—Digital
Demodulation Mode
Note Before moving on to Step 3, be sure to hook your spectrum analyzer back up to the upstream signal
source.
Step 3 On your spectrum analyzer, narrow both the resolution and video bandwidth to 1 MHz. You will notice
that the preamble of the signal has dropped in amplitude, yielding a spectrum analyzer display similar
to the one in Figure 4-39.