Patent ID: 7895366

Claim:
An information transmission device that is included in components and carries out communication between the components in an information processing device including a control monitoring unit that controls and monitors the components, comprising: a transmission control unit that stores a transmission parameter including one or more of an output amplitude, emphasis strength, a driving impedance, selection of AC/DC coupling, and a transmission speed; a transmission unit that has transmission data input thereto in a first transmission speed or a second transmission speed having a transmission speed lower than the first transmission speed, modulates the transmission data in the second transmission speed by a pattern of the first transmission speed when the transmission data in the second transmission speed is input, adjusts the transmission data in the first or second transmission speed according to the transmission parameter, and sends the transmission data as respective first or second transmission signal to the information transmission device which is a connection destination via a transmission path; a receive control unit that stores a receive parameter including one or more of an equalizer coefficient and a gain; and a receiving unit that adjusts a received first or second transmission signal received from the information transmission device which is a connection destination in accordance with the receive parameter, demodulates the received second transmission signal in the second transmission speed modulated by the pattern of the first transmission speed, and outputs the received first or second transmission signal in the respective first transmission speed or the second transmission speed as receive data, thereby the transmission data in the first and second transmission speeds are transmitted using the same transmission path, wherein the transmission unit sends a test pattern to the information transmission device which is a connection destination in the first transmission speed, when the information transmission device which is a connection destination receives the test pattern, an error ratio of the test pattern is measured, and the information transmission device sends a measurement result of the error ratio in the second transmission speed, the receiving unit receives the measurement result of the error ratio, and the transmission control unit changes the transmission parameter based on the measurement result of the error ratio.