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Chapter 4
Connecting the Cisco uBR7225VXR Router to the Cable Headend
Figure 4-38
Before moving on to
Note
source.
On your spectrum analyzer, narrow both the resolution and video bandwidth to 1 MHz. You will notice
Step 3
that the preamble of the signal has dropped in amplitude, yielding a spectrum analyzer display similar
to the one in
OL-17309-01
Vector Signal Analyzer Plot of Upstream Data Burst (Preamble Only)—Digital
Demodulation Mode
Step
3, be sure to hook your spectrum analyzer back up to the upstream signal
Figure
4-39.
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
Measuring the Upstream RF Signal
4-33
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Troubleshooting
