Fremgangsmåde og kredsløb til indstilling af programmerbare gaffelkoblingers abonnentlednings-balanceringsimpedanser

摘要

Access to the transmitting and receiving paths of the TDM line (TX, RX) connecting to the switching network is provided via a programmable interface (CPI) through the control (CTR) of the user connection module. PCM words occurring N times on the receiving path (RX) during existing connections at intervals which are great in relation to the pulse frame length and, after a reflection period in each case, several PCM words occurring on the transmitting path (TX) over several pulse frames are recorded subjected to amplitude evaluation and, if validated, to cross-correlation. The result of the cross-correlation provides a setting parameter for the balancing impedance. ……