# How is the data from the three DSN sites transmitted to JPL, NASA and vice-versa?

We know that there are three major Deep Space Network (DSN) sites on Earth, roughly $$120^{\circ}$$ apart, to communicate with space probes in deep space continuously. All the data from the three DSN sites must somehow be transferred to NASA. If a signal is transmitted to the spacecraft then data must flow from JPL, NASA to the corresponding station which can be used to relay. How is the data from the three DSN sites transmitted to JPL, NASA or vice-versa? Is that through a guided medium like optic fibres or is that through a un-guided medium like satellite communication, or is that something else?