Digital data, including audio and video, may be communicated at increased data rates by utilizing non-data signal channels in cables to communicate additional data. For data transmission, a reformatter receives data in a first format adapted for communication over the data signal channels of a cable. The reformatter may convert the received data into a second format with one or more additional data signals. The reformatter then utilizes non-data signal channels of the cable to carry the additional data signals. An example non-data signal channel may include a clock signal channel, and the reformatter may fold a clock signal into one or more of the data signals to allow for clock recovery downstream. Data may also be split into two or more subsets and each subset encoded separately, for example with two or more data encoders such as legacy HDMI encoders.