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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 RF Signal at the Forward Test Point on a Laser Transmitter
Figure4-47 Downstream Forward Test Point on the Laser Transmitter—Digital Channel Display
Step6 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 Figure4-48.)
Figure4-48 Downstream Forward Test Point on the Laser Transmitter—Digital Channel Power
Display
Note The +3.6 dBmV digital power rating is nearly the same as the previously measured video carrier level
(+4.3 dBmV). This value is too high to provide reliable digital data transmission.
Step7 Set the upconverter output level so that the amplitude of the digitally modulated carrier is 6 dB to 10 dB
below the amplitude found on the same frequency on an analog TV channel.