Phase synchronization between timers

An apparatus comprising:

• a first network interface controller comprising a first network interface, first timer, and a first signal transceiver, wherein the first timer is to generate a first timing signal based on Institute of Electrical and Electronics Engineers (IEEE) 1588 Precision Time Protocol (PTP) timing signals and
• circuitry to reduce offset between the first timing signal of the first network interface controller and a second timing signal from a second timer of a second network interface controller based on a first signal transmitted over a communication line from the first signal transceiver to the second network interface controller and also based on the first signal transmitted from the second network interface controller back to the first network interface controller over the communication line, wherein the first timer is to generate the first signal based on the first timing signal.