| 摘要 |
PURPOSE:To increase a transmitting channel, to delete a transmitting dead time of a bit code and to improve transmitting efficiency of information quantity economically by forming and transmitting a frame to arrange serially a voice and data respectively to a pair of lines. CONSTITUTION:A key telephone system 10 is linked by a key telephone line 30 respectively composed of two lines of an exchange main device 20, a transmitting line 31 of information and a receiving line 32. At the telephone system 10, a frame forming means 13 to form the frame to send information to the device 20 received from a data bus 12 to the line 31, a frame transmitting means 14 to send the formed frame to the line 31, a frame receiving means 15 to receive the inputted frame from the line 32 and a frame decoding means 16 to decode the bit code of the frame and sent to the bus 12 are installed. For the digital coding constitution transmitted to the line 30, a frame synchronizing signal is arranged to the first four bits, control data are arranged to the next four bits, the data are arranged to the next eight bits and the second voice is arranged to the final eight bits. |
