System for transmitting information with reserve switching devices

摘要

In transmission systems, one two-way user channel is normally provided for N two-way service channels. A structure of this type entails corresponding circuit costs. The structure of the new system is intended to be simplified. Only one reserve channel unit, which comprises a receiver, demodulator, modulator and transmitter and which is designed so that its transmission direction can be reversed by switching means and control devices, is provided in the intermediate stations of the transmission system. <IMAGE>