METHOD AND CIRCUIT FOR SETTING SUBSCRIBER LINE BALANCE IMPEDANCES OF PROGRAMMABLE HYBRIDS

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. ……