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The analog transmission optical link covers the frequency band from 120 c/s to 120 Mc/s with a dynamic range better than 45 dB (peak to peak signal/r.s.s. noise ratio) and a rise time shorter than 5 ns. The link is commonly used under external test site conditions. It is a two-channel link, i.e. one for the signal and the other for the remote control of operation and sensor sensitivity switching. The sensors are of the active type and their dynamic range is higher than 120 dB. The sensor response is flat at 1 dB all over the frequency range. Receiver side, the signal link is ended by an avalanche diode. The signal gain is automatically controlled (A.G.C.) by means of a digital attenuator. The optical link is either hand remote controlled or automatically by means of an external computer.