process and installation for the control of communication of information from the point of view of the sign of the end in the central control facilities;

摘要

The duration of a terminal signal on a telecommunication line in a binary coded multiplex space division switching system is measured by counting synchronizing pulses occuring during receipt of the signal which has a known duration and polarity. A decentralized marker assigned to each line detects the first pulse. If a succeeding pulse is detected, a central counting stage is assigned to the line to determine if the requisite number of pulses to constitute a terminal signal are received, after which the central control terminates the connection.