Patent ID: 7733967
Filing Date: 2010-06-08
Classification: H04L

Abstract:
1. An automatic transmitter adjusting method of a transmitting device which has a pair of devices each having a transmitter and a receiver, in which a transmitter of a first device is connected to a receiver of a second device, and a transmitter of said second device is connected to a receiver of said first device for two-way transmission; said method comprising: a transmission processing step of transmitting sample data while changing the setting of an output amplitude and/or emphasis of the transmitter of said first device within a prescribed range; a receiving processing step of generating an eye diagram from the sample data received by the receiver of said second device, and detecting and transmitting phase-range data from said eye diagram; and an optimization processing step of writing the phase-range data transmitted from said second device into a table in correspondence to said output amplitude and emphasis of which the setting has been changed, and determining optimum values of said output amplitude and emphasis from said table obtained at the end of setting change within said prescribed range for setting the optimum values in the transmitter of said first device; wherein: said transmission processing step initializes the maximum values of the output amplitude and emphasis, transmits sample data to the transmitter of said first device, and then, in a state in which said emphasis is fixed at the maximum value, transmits the sample data while changing the setting of said output amplitude within a prescribed range; said receiving processing step receives the sample data transmitted while changing the setting of said output amplitude within the prescribed range in a state in which said emphasis is fixed at the maximum value, generates an eye diagram, and detects and transmits receivable phase-range data from said eye diagram; and said optimization processing step writes the phase-range data transmitted from said second device into the table in correspondence to said output amplitude of which the setting has been changed and determines an optimum value of said output amplitude from said table obtained at the end of the setting change within said prescribed range.