KEYPHONE INTERFACE SYSTEM

摘要

The circuit transmits the both of voice and data signal through one passway with switching control method. The circuit comprises a a firsts mixer separator (1) connected to the main keyphone (10) and processing the voice and data signal with the selection signal of a CPU, a second mixer/separator (2) connected to the sub keyphone, and switches (SW1-2) switching the data according to the transmission/reception mode.