Data communications methods and apparatus

In an embodiment, a source device encodes source information corresponding to a frame, assembles an initial data frame that includes the encoded data blocks, and transmits the initial data frame to a destination device. The destination device decodes the encoded data blocks and assembles a restored version of the initial data frame. The destination device identifies corrupted data blocks and uncorrupted data blocks within the restored version, stores the uncorrupted data blocks, generates a message that identifies the corrupted data blocks, and transmits the message to the source device. In response, the source device encodes source information corresponding to the corrupted data blocks identified in the message, assembles a responsive data frame, and transmits the responsive data frame to the destination device. The destination device produces a corrected data frame from the retransmitted data blocks and the previously-stored uncorrupted data blocks.