Payment circuit for local and trunk calls - has voltage sensitive element and electronic counter which may have four or more stages

摘要

Counting pulses for local calls are individually transmitted, and counting pulses for trunk calls are transmitted by a subsequent selection element. A voltage sensitive element and an electronic counter are included for local calls. The former are made conducting by the closed loop potential, so that centrally generated pulses are applied to the electronic counter (ZG) whose output is connected to a switch (Z) activated by it. The counter (ZG) which can have four or more stages, returns to its initial state after reaching its last output. It is also reset when a call starts or ends, irrespective of the output which is activated. A switch (3rk) is used for trunk calls. It disconnects the voltage sensitive element and connects the local counting pulses receiving the switch to the circuit transmitting trunk call counting pulses.