Noise Measurement Methodology; Average Upstream Noise Measurement; Table 33: Average Noise Spectrum Analyzer Settings - Juniper G10 CMTS Hardware Manual

Noise Measurement Methodology

This section describes the methodology for conducting average and peak upstream noise
measurements. The procedures establish a consistent methodology for obtaining the
requested information during the characterization of the installation site. We recommend you
use the HP 8591C spectrum analyzer for taking these measurements.

Average Upstream Noise Measurement

This section defines a procedure for taking the average upstream noise measurements
required as part of the RF plant and HFC environment characterization. We recommend that
you take a sample of 10 percent of the nodes terminated at the installation site. Table 33
provides the appropriate setup configuration settings for the HP 8591C spectrum analyzer.

Table 33: Average Noise Spectrum Analyzer Settings

1.
2.
3.
After completing the measurement, the analyzer display should resemble Figure 23 on
page 84.
Setting
Start frequency
Stop frequency
Resolution bandwidth
Video bandwidth
Scale
Internal amplifier
Attenuator
Reference level offset
Reference level
Number of averages
You might need to adjust the reference level for your
particular test environment.
Connect the spectrum analyzer to the selected upstream signal at the upstream splitter
or at the CMTS upstream port.
Configure the spectrum analyzer using the values defined in Table 33.
Start the measurement.
Noise Measurement Methodology
Value
2 MHz
45 MHz
100 kHz
30 kHz
5 dB/div
On
0 dB
-28 dB
-5 dBmV
100
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Prepare the Site 83