Electronic coupling field arrangement for messaging system

摘要

The arrangement is formed as an X-Y matrix in an integrated structure, consisting of pairs of associated connecting lines. Switch arrangements (Taxx, TbxR) are provided at the crossing points between X- and Y-connecting lines in form of switching elements. An individually selectable switching element (Taxx) is provided for connecting an upper row (al, a2,...) of a connection line pair (al, bl; a2, b2; ...) to a first Y-connection line (Yl2, Y22, 777) of a first Y-pair. A second switching element (TbxR) is provided for each subscriber, for connecting a lower row (bl, b2,...) of a connection line pair (al, bl; a2, b2; ...) to all further Y-connection lines (Y11, Y21, 777). These further Y-connecting lines are connected to a common reference potential. The second switching element is activated only together with the upper switching element, and preferably consists of a circuit which performs a current limit with suppression of an LF speech signal, and an undamped connection for office conversations.