Electro-optical communication station with built-in test means

摘要

A station-to-station communication system with a built-in testing arrangement in at least one of the stations. The testing arrangement includes a transmitter/receiver pair (31, 33) with associated light/electricity and electricity/light transducers (29, 28) connectable at will by controlled switching means (32). When the transmitter/receiver paid is inter-connected, electro-optical light signals emitted by the transmitter are returned to the receiver and produce perceptible signals.