ALARMING TONE SENDING CIRCUIT BY TONE SENDER

摘要

The circuit provides digital wavning message in telephone exchange system. The tone sender contains also a circuit capable of converting warning message signal into digital one using a TDM bus. There are two modes of dial tone and warning message. The system contains structures of decoding tone command into dial tone command, synchronizing warning message with tone command to send warning message upon dial tone command, and generating warning message or tone data on the TDM bus from the tone sender according to decoding signal as not.