| 摘要 |
A telephone private switching equipment of the space-division operated type comprises a matrix of electronic switch cross-points each made of a single controllable two-state member connected across a conversation conductor of a row and a conversation conductor of a column of the matrix and having a trigger terminal connected through unidirectional members to both a cross-point activation conductor of this row and a cross-point activation conductor of this column, each row and each column comprising only these two conductors. Each column of the matrix is controlled from a cross-point selection control unit capable of applying trigger pulses to the cross-point activation conductor of the column and service voltages and currents to the conversation conductor of the column. Each subscriber's line circuit of the equipment includes a two-wire to one-wire converter the one-wire terminal of which is connected to the conversation conductor of a row and includes means capable of applying periodical pulses to the cross-point activation conductor of this row. Each external network line connecting circuit of the equipment is connected by a one-wire conversation lead to the conversation conductor of a row comprising only a single cross-point of the matrix.
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