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DATA ACQUISITION
Analog-to-Digital Converter Basics
Digital-to-Analog Converter Basics



NOISE

Intro To Low-Noise Design
CAP ADSL NEXT Calculation
DMT ADSL NEXT Calculation
HDSL NEXT Calculation
Subscriber Loop FEXT-NEXT Comparison
4-WIRE DDS NEXT Calculation

HDSL Disturbers Near-End Crosstalk Calculation


HDSL disturber model from T1E1.4/95-007R2, Annex B (p140)

                     ;in KHz

 

                        ;in KHz

 

                    ;f is in KHz

 

 

Power Spectral Density (PSD) (dBm/Hz) of an HDSL Disturber vs f (KHz)

 

 

                    ;f is in KHz

 

                           ;n = number of HDSL NEXT disturbers (1, ... , 49)

 

 

PSD (dBm/Hz) of HDSL Disturber NEXT vs f (KHz)

 

Low-frequency integrated HDSL NEXT power (spot power for df = 1) (dBm), f must be < 20 KHz for this model:

 

 

 

High-frequency integrated HDSL NEXT power (spot power for df = 1) (dBm), f must be > 20 KHz for this model:

 

 

 

Total power (dBm) is:

 

 
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