Operating Principle

The actual I/O routing is performed by an active routing matrix incorporated into the RCX board, which replaces the former RMX. The star-topology audio bus connects the board to the respective I/O boards (RFOC or RMF).
The NEXUS STAR accommodates a maximum of 16 boards — eight on the left side and another eight on the right side of the router. All boards are controlled in parallel. The RCX (which replaces the RCPU) handles the central control and management tasks and the control-computer connections and also provides the synchronisation interfaces.
The I/O boards convert the input signals to the internal linear data format, route the data to the audio bus, or read it. Multiple boards can read and use the same signal at the same time.
The RFOC fibre-optic interface boards (which are referred to as XFOC boards on the NEXUS), bundle the 256 signals to transfer them over optical lines to the corresponding boards in other Base Devices. These also route the signals to audio buses.

Interfaces

The NEXUS STAR currently supports two different interface formats:

  • The RFOC fibre-optic interface board is available for connecting NEXUS Base Devices to NEXUS STAR.
  • The RMF board supports the MADI multichannel format. It provides direct connectivity to multitrack recorders or digital mixing consoles.

Thanks to the modular structure of NEXUS STAR, further interface-boards can be added at any time, e.g. for upgrading the system to handle future formats.
 

The following explains the number of channels that can be transferred on the respective paths within NEXUS STAR and on the overall system:

Bus

The NEXUS STAR backplane features 16 slots for interface boards. The star-topology audio bus transfers 256 input channels and 256 output channels to each of these slots.

Routing Matrix

The star point is the RCX switching matrix that performs the actual routing of 4,096 (16 × 256) inputs to 4,096 outputs.

Interface Boards

Thus, up to 256 inputs and 256 outputs are available for each I/O board. For example, on the RMF MADI board, these resources are distributed to four 64-channel ports.

Fibre-Optic Connection Board

The RFOC optical-interface board provides up to four ports with an overall capacity of 256 input channels and 256 output channels. The board connects directly to NEXUS fibre-optic interface boards.

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