A particular residential gateway includes a connector interface to receive a composite signal including voice data, video data, and network data via one or more communication lines and a power coupling device to receive power via the one or more communication lines. The residential gateway includes a voice module to route the voice data to a voice-enabled device coupled to a network interface, a video module to route the video data to a video-enabled device coupled to the network interface, and a network module to route the network data to a computing device coupled to the network interface. The residential gateway further includes a testing module to communicate test results to an external device via a data communication interface. At least one of the voice module, the video module, the network module, and the testing module is powered using the power received by the power coupling device.