A comparison study on the three techniques has been done. The study is applied to a particular digital communication link of 280 km length and of 34 M bit/s transmission capacity. It is found that the fiber optic systems are inherently noiser than the others, and the available system gain is much less than it for the microwave and coaxial systems. However, the bandwidth advantage of fiber optics can be utilized through bandwidth expansion techniques to overcome the noise disadvantages. The low loss advantage allows using longer repreater span for fiber optic systems. The study showed that the optical system is less complex, and the coaxial one comes in the second rank. The estimate cost of the particular link gave that the optical fiber system is the least expensive one, whereas using the coaxial cable led to the most expensive system. For the proposed link, the estimated establishment time for microwave does not exceed 10% over the time needed for the other techniques.