Patent ID: 8179951

Claim:
A transmission output control apparatus for controlling a transmission output of a signal to be outputted to a communication line, comprising: a transmission output control unit that controls the transmission output of the signal to be outputted to said communication line, based on a difference between a transmission distance of said communication line and a transmission distance of an adjacent line adjacent to said communication line; a transmission output calculation unit that calculates a transmission output value depending on said difference; and a used band estimation unit that estimates a used band of said adjacent line, wherein said transmission output control unit controls said transmission output by using the transmission output value calculated by said transmission output calculation unit within a range of said used band, and said transmission output control unit controls said transmission output by using a predetermined transmission output value out of the range of said used band, and said transmission output control unit controls said transmission output if a crosstalk noise from said adjacent line has exceeded a predetermined threshold.