Technologies for high-speed data transmission including a network port logic having a communication lane coupled to a physical medium dependent/physical medium attachment (PMD/PMA) sublayer, a physical coding sublayer (PCS), and a media access control (MAC) sublayer. The communication lane receives serial binary data at a line speed such as 25 gigabits per second. The PMD/PMA converts the serial binary data into parallel data, and the PCS decodes that parallel data using a line code also used for a slower line speed such as 10 gigabits per second. The network port logic may include four independent communication lanes, with each communication lane coupled to a dedicated PMD/PMA, PCS, and MAC. The network port logic may also include a multi-lane PCS and multi-lane MAC to receive and transmit data striped over the four communication lanes. Other embodiments are described and claimed.