The 835 Direct Connect Modem (DCM) is designed for use with the Bell 103 Telephone System. It operates at a transfer rate of 300 Baud. Features include, Automatic Pulse Dialing, Software controlled Originate/ Answer Mode Switching, and Audio Monitoring of the telephone line. The 835 allows for transfer of data over the telephone line directly (bypassing the telephone handset).
WARNING: Do not hook the 835 DCM to Bell Telephone's "Horizon - System". Doing so damages the telephone system. "Horizon" is a 4-wire, non-standard configuration that accepts only touch-tone pulsing.