VERFAHREN UND SCHALTUNGSANORDNUNG ZUR EINSTELLUNG DER TEILNEHMERLEITUNGS-NACHBILDUNGSIMPEDANZEN VON PROGRAMMIERBAREN GABELSCHALTUNG.

摘要

The simulated impedance selection circuit uses a cross-correlation between PCM words obtained from the reception path (RX) at relatively long intervals compared to the pulse frame length and PCM words obtained from the transmission path (TX) after a given reflection time. The evaluation of the cross-correlation is effected by summation of the cross-correlation is effected by summation of the cross-correlation coefficients. The evaluating indicates a value of approximately zero or above or below a threshold value to maintain the selected simulated line impedance or reduce or increase the simulated line impedance accordingly. Pref. the rapid evaluation of the PCM words is effected via the programmable interface, with subsequent storage.