A power line communication apparatus (200) includes a mains power connector assembly (210) with three or more first connectors (211) connectable to a mains distribution network. A mains filter (220) provides a filter path between each of its first ports (221) and a corresponding one of second ports (222), wherein each first port (221) is connected to one of the first connectors (211). Each second port (222) is connected to one of three or more second connectors (282) of an AC power socket (280). A power line communication unit (250) is connected with each of the first ports (221) and transmits and/or receives data according to a transmission method using more than one transmission channel between two devices connected via the mains distribution network. The mains filter (220) improves PLC transmission quality by suppressing disturbances generated by the appliances and reduces PLC stray radiation.