Hybrid transmission system with a fallback solution for connections with high availability requirements

摘要

The system has a central station (1), at least one antenna unit (2), and at least one user station (3). The central station is connected via a transmission medium (8) to the antenna unit, which converts a first signal received from the central station into a first radio signal (F1), with a first frequency, which the user station can receive. The antenna unit converts a second radio signal (F2) received from the user station into a second signal, and passes it to the central station. The antenna unit and the user unit can detect increased attenuation of the radio signals, and in this situation the first and second frequencies are reduced by switching over to receivers operating at the reduced frequencies.