Cisco Systems UBR7225VXR Connecting the Cisco uBR7225VXR Router to the Cable Headend

Chapter 4 Connecting the Cisco uBR7225VXR Router to the Cable Headend

Measuring the RF Signal at the Forward Test Point on a Laser Transmitter

Figure 4-47 Downstream Forward Test Point on the Laser Transmitter—Digital Channel Display

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.)

Figure 4-48 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.

Step 7 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.

	Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02		4-39