The PRS-CSRM is a module with the same functionality as the remote call station, PRS-CSR, but without its housing and other components. It is a building block to make custom call stations or panels. It connects via a CAT-5 cable, one-to-one, to the call station interface, PRS-CSI, which is part of the Praesideo optical network. The CAT-5 cable, carrying digital audio and control data, can be as long as 1km.

The CAT-5 cable does not contribute to the Praesideo optical network length. This considerably increases the overall possible length of the network. The PRS-CSRM can be extended with up to 16keypads (LBB 4432/00 or PRS-CSKPM), each wit height configurable keys. Extension with a numeric keypad (PRS-CSNKP) is also possible.

Functions
The call station module has a connection for a supervised microphone. A limiter and a speech filter improve intelligibility and prevent clipping of the audio. It has a volume control for the monitoring speaker and the headset. When it plays a chime or a pre-recorded message, this can be monitored via a connected loudspeaker or headphone. When a headset is connected, it replaces the microphone and speaker. The call station has its own DSP for audio processing functions, including sensitivity adjustment, limiting and parametric equalization.

The module gets its power from the interface unit via the CAT-5 cable, but is also equipped with a local power supply connection for extreme cases with a very long cable and many keypads. Call station keypads can connect to the module via a serial communication link. The module provides the power for the keypads. The remote call station is fully supervised and supports fail-safe operation. Even if the Praesideo network cont