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Noise Measurement Methodology
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Figure 1: Average Upstream Noise Measurement Example
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Peak Upstream Noise Measurement
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Table 9: Peak Noise Spectrum Analyzer Setup
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14
Juniper Networks G10 CMTS Pre-Installation Guide
This section defines a procedure for taking the peak upstream noise measurements
requested as part of the RF plant/HFC environment characterization. A statistical sample of
total nodes terminated at the installation site (10% recommended) should be taken. Table 9
provides the appropriate setup configuration settings for the HP 8591C spectrum analyzer.
Setting
Start Frequency
Stop Frequency
Resolution Bandwidth
Video Bandwidth
Scale
Internal Amplifier
Attenuator
Reference Level of Headend
Max Hold
1.
Connect the spectrum analyzer to the selected upstream signal at the upstream splitter
or at the CMTS upstream port.
2.
Configure the spectrum analyzer per the values defined in Table 9.
3.
Start the measurement.
Upon completing the measurement, the analyzer display should resemble Figure 2 on
page 15.
Value
2 MHz
45 MHz
100 kHz
30 kHz
5 dB/div
Off
0 dB
0 dBmV
1 minute
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