Transmission quantity measurement of system input - using signal lines, generator and level meter for transmission of analogue signals via digital channels

摘要

Transmission quantities measurement is of a system input for transmission of analogue signals via digital channels. It uses input and output lines for digital and analogue signals, digital signal generator and level meter for analogue signals. The output of a first converter (60) for digital-to-analogue conversion is connected to the analogue output liner (40). A first switch-over device (51 connects the output of the generator (50) of the digital signals either to the input of the first converter (60) or to the digital output liner (30). A second converter (70) for digital-to-analogue conversion and a second switch-over device (81) are also provided.