PB SENDER CONNECTION SYSTEM

PURPOSE:To facilitate the control of a central control circuit reduce the capacity of a signal memory, by adopting a specific system for the control of connection between a dial sender and a trunk in the multifrequency signal system of a time division exchange. CONSTITUTION:A dial sender PBS is provided with signal memories M0-M11 where prescribed bytes of a PCM code corresponding to the PB dial signal are stored, and addresses of these memories M0-M11 are designated by the address of an address designating circuit ACR which receives clock pulses. The start and the address designation of this circuit ADR are monitored by a control circuit CNT which receives instructions from a central control device CC, and the PCM code is transmitted to trunks TRK0-TRKm by time slots. Address are designated in order from the lowest address; and after the highest address is read out, the address designation is stopped under this state. A PCM code corresponding to silence is stored in the highest address of memories M0-M11 to prevent to occurrence of noise.