| 摘要 |
PURPOSE:To make the type of a line terminator to one kind through the use of an interface circuit which can respectively corresponds to telephone sets, facsimile terminals and data terminals and to achive the effective use of subscriber lines through time division and multiplex of information from each terminal. CONSTITUTION:The information transmitted from telephone sets, facsimile terminals and data terminals is inputted to a terminal interface section 4 via input and output terminals 1, 2, 3. The terminal interface section 4 makes electric level conversion or logical conversion depending on the procedure of transmission control. For example, in the case of the data terminals, electric conditions of various terminals are converted into electric levels of logical ICs, and in case of a telephone set, an audio signal or a control signal is converted into a digital signal. Next, the service information and the control signal in logical conversion or electric level conversion are multiplexed at a code converter section 5. Next, multiplex signal is converted into a code waveform suitable for the lines at a level converter section 6 and transmitted to lines via a line transmission terminal 7. |
