  This paper describes the technical details and practical implementation of
the Mid-Frequency Square Kilometre Array (SKA) phase synchronisation system.
Over a four-year period, the system has been tested on metropolitan fibre-optic
networks, on long-haul overhead fibre at the South African SKA site, and on
existing telescopes in Australia to verify its functional performance. The
tests have shown that the system exceed the 1-second SKA coherence loss
requirement by a factor 2560, the 60-second coherence loss requirement by a
factor of 239, and the 10-minute phase drift requirement by almost five
orders-of-magnitude. The paper also reports on tests showing that the system
can operate within specification over the all required operating conductions,
including maximum fibre link distance, temperature range, temperature gradient,
relative humidity, wind speed, seismic resilience, electromagnetic compliance,
frequency offset, and other operational requirements.
