Cisco Systems UBR7225VXR specifications OL-17309-02

Chapter 4 Connecting the Cisco uBR7225VXR Router to the Cable Headend

Measuring the Downstream RF Signal

Figure 4-21 Measuring the RF Signal at the Upconverter Output in CATV Mode—Digital Channel Power Screen Using Video Averaging

Note The approximate in-channel peak-to-valley flatness can be verified using the spectrum analyzer’s video averaging feature. Be aware, however, that amplitude values registered while in the video averaging mode are typically around 2.5 dB below the actual channel power.

Step 11 Verify that your headend RF measurements meet the recommended DOCSIS parameters listed in the tables in Appendix B, “RF Specifications.”

Step 12 Record your headend settings and measurements in Appendix G, “Site Log.” as you verify them. This will assist in troubleshooting the Cisco uBR7225VXR router installation later in the process.

Step 13 After you have analyzed and adjusted the RF signal according to the steps outlined on the preceding pages, proceed to the “Connecting and Configuring the Upstream” section on page 4-18.

	Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
OL-17309-02		4-17