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Chapter 4
Connecting the Cisco uBR7225VXR Router to the Cable Headend
Figure 4-47
Step 6
Go to the main menu on the spectrum analyzer and advance the screen displays (next screen) until the
digital channel power display is shown. (See
Figure 4-48
The +3.6 dBmV digital power rating is nearly the same as the previously measured video carrier level
Note
(+4.3 dBmV). This value is too high to provide reliable digital data transmission.
Set the upconverter output level so that the amplitude of the digitally modulated carrier is 6 dB to 10 dB
Step 7
below the amplitude found on the same frequency on an analog TV channel.
OL-17309-01
Measuring the RF Signal at the Forward Test Point on a Laser Transmitter
Downstream Forward Test Point on the Laser Transmitter—Digital Channel Display
Downstream Forward Test Point on the Laser Transmitter—Digital Channel Power
Display
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
Figure
4-48.)
4-39
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Table of Contents
Troubleshooting
