Interference Frequency Signatures
The 965DSP Spectrum Analyzer function provides a graphical display of the signals and noise on a line over a selected range of frequencies.
The spectrum analyzer continuously analyzes the line and updates the screen as conditions change. The screen displays the average power of all signals and noise in the selected frequency span in dBm at the upper left. The actual signal level at the cursor position is displayed in dB at the upper right.
Interfering noise signals on a pair often occur as the result of crosstalk from other wideband services in the same cable.
Each wideband service type has a unique frequency signature as shown in the following figures. Use the spectrum analyzer to classify the source of the noise interference on the pair. Following are some examples of the most common frequency signatures.
ISDN Interference | HDSL Interference |
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ADSL Upstream Interference | ADSL Downstream Interference |
T1 Interference
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