SERIAL TRANSMISSION SYSTEM AND PORT

PROBLEM TO BE SOLVED: To provide a serial transmission system, a transmission port and a reception port for automatically correcting the quality of reception signals. SOLUTION: The serial transmission system performs data transfer between a first port and a second port via a transmission path. The first port includes a receiving unit that receives data, a signal-quality measuring unit that measures the signal quality of the received data, a correction-request-data generating unit that generates correction request data for transmission output of the second port on the basis of a result of the measurement, and a sending unit that sends the generated correction request data. The second port includes a sending unit that sends data, a receiving unit that receives the correction request data from the first port, and a setting unit that changes settings of the transmission output of the sending unit on the basis of the received correction request data. COPYRIGHT: (C)2008,JPO&INPIT