| 摘要 |
<p>Counting pulses for local calls are generated. Switching means become active and pass pulses when a continuous or quasi-continuous potential appears at the beginning of a local call, or during trunk calls when counting pulse potential appears. A counter (ZG) is provided for continuous pulses reaching the counter through the element (SG). The counter reset itself to its initial state after couting a specified number of pulses, while the switching means are conducting only when the counting potential or the initial potential is present, and reset the counter at the beginning or end of the counting or initial potential. A relay is connected directly or indirectly the first or second or further outputs at the beginning of the count. It operates and marks a connecting pulse. Amplifier and timing elements can be provided in the relay circuit.</p> |
