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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
T1 Interference
ADSL Upstream Interference
ADSL Downstream Interference