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The APWR power supply has four DC outputs delivering the desired voltages for AlphaCom and AlphaCom E exchanges.
The Filter Board and Speech Adapter with Relay provides an interface to PA systems. It has filters that remove the display data carrier from the audio. In this way, excessive heating of power amplifiers is prevented.
The Remote Input Output Unit (RIO) is a flexible way of connecting digital inputs/outputs to the AlphaCom exchange. The devices can operate on point to point connections (RS 232) or on a multidrop bus (RS 485).