Modem unit

摘要

A modem unit is adapted to be coupled between a land or radio telephone line and a terminal equipment. The modem unit is provided with a modem circuit for modulating data received from the terminal equipment and for demodulating data transmitted to the terminal equipment. Additionally an isolation circuit for providing a DC isolation between the telephone line and the terminal equipment is included. The modem circuit and the isolation circuit are respectively provided on a single modem integrated circuit card.