CAP T1 ADSL Disturbers Near-End Crosstalk Calculation

CAP T1 ADSL downstream disturber (reference lab spectrum photos)

           ;f is in KHz

Note: -3.01 corrects spectrum analyzer voltage measurement converted to dBm wrt 50 Ohm to dBm wrt 100 Ohm

Power Spectral Density, PSD (dBm/Hz) of a CAP T1 ADSL Downstream Disturber vs f (KHz)

           ;f is in KHz

                ;n = number of CAP T1 ADSL NEXT disturbers (1, ... , 49)

PSD (dBm/Hz) of CAP T1 ADSL Downstream Disturber NEXT vs f (KHz)

Low-frequency (f < 20 KHz) integrated CAP T1 ADSL downstream NEXT power negligible.

High-frequency integrated DMT ADSL downstream NEXT power (spot power for df = 1) (dBm), f must be > 20 KHz for these models:

125 < f < 250 KHz:

250 < f < 500 KHz:

Total power (dBm) is:

CAP T1 ADSL upstream disturber (reference spectrum photos from April 9, 1996)

           ;f is in KHz

PSD (dBm/Hz) of a CAP T1 ADSL Upstream Disturber vs f (KHz)

         ;f is in KHz

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

PSD (dBm/Hz) of CAP T1 ADSL Upstream Disturber NEXT vs f (KHz)

Low-frequency (f < 20 KHz) integrated CAP T1 ADSL upstream NEXT power negligible.

High-frequency integrated DMT ADSL upstream NEXT power (spot power for df = 1) (dBm),

 

33000 < f < 66000 for this model: