AUTOMATIC INFORMING DEVICE

摘要

PURPOSE:To attain the high-speed operation of an automatic informing device by controlling a dial transmission time after discriminating the presence or absence of dial tones and busy tones given from an exchange. CONSTITUTION:A start signal is applied to a detection circuit 1 for the push of a emergency button when said button is pushed. The circuit 1 detects a start signal and starts a primary control circuit 2. While a busy/replay detecting circuit 3 discriminates the presence or absence of a busy mode and then sends a signal to the circuit 2 as the busy information is the busy mode is detected. The circuit 2 controls immediately a relay CML if no busy mode is detected and controls the CML after a call is over if the busy mode is detected. Thus a trunk line is switched to an automatic informing device from a telephone via a contact cml. When a DT/BT detecting circuit 4 detects a dial tone, the circuit 2 drives a dial transmitting circuit 5.