the present disclosure discloses a method for common transmission over multiple line pairs , and a transmitting device and a receiving device therefor . the method for common transmission over multiple line pairs includes : modulating information to be sent ; and sending a modulated signal to a receiving device over the multiple line pairs ; wherein , a transmission spectrum of each transmitter in the multiple line pairs comprises two parts : a first part is a frequency segment that meets a bearer condition of a modulation method , and a second part is a frequency segment that does not meet the bearer condition of the modulation method .