Abstract: This application provides a data transmission apparatus and a data transmission method. The data transmission apparatus in this application includes: a first connection unit and a control unit, where the first connection unit is a connector plug or a connector socket; and the control unit is configured to: if determining that the first connection unit is in a forward insertion state, control a first data pin pair of the first connection unit to be in a first communication mode, and control a second data pin pair of the first connection unit to be in a second communication mode.

Abstract: The present disclosure relates to a communication apparatus and a data transmission method. In an example, the communication apparatus includes a universal serial bus (USB) protocol layer, a USB adapter layer, a transport layer, and a physical layer. The USB protocol layer is configured to send first data to the USB adapter layer. The USB adapter layer is configured to perform physical link adaptation on the first data to obtain second data and send the second data to the transport layer. The first data is adapted to a first physical link, the second data is adapted to a second physical link, and a bandwidth of the first physical link is lower than a bandwidth of the second physical link. The transport layer and the physical layer are configured to process the second data and send processed second data to a receive end through the second physical link.