Project Description

Stage Tec Nexus Star

A powerful and comprehensive audio router, capable of providing the extensive routing requirements demanded for today’s broadcast and production facilities. With the ability to route 4096 inputs to 4096 outputs (over 16 million crosspoints) the Nexus Star is designed to be implemented as the core of a larger Nexus installation, networking up to 31 Nexus Base Devices. The 6U 19” rack-mounting unit comprises I/O boards for connection to Nexus Base Devices and external MADI equipment, a wide range of synchronisation options and redundant power-supply units.


  • 4096 x 4096 routing matrix
  • Routes audio and control data to multiple Nexus Base Devices by fibre optics
  • Any input can route to any output (one-to-one or one-to-many)
  • Maximum distance between Nexus Star and Nexus Base Devices over 60 miles
  • Dolby® E approved


  • Up to 256 channels (bi-directional) per optical fibre or MADI I/O board
  • Sample rates up to 96 kHz
  • Comprehensive sync options
  • Audio DSP includes comprehensive facilities for gain, equaliser, dynamics, delay, signal path and cross-fades
  • All interface cards hot-swappable for redundancy

Other features:

  • PC-based graphical interface for control of entire system
  • Built-in monitoring and diagnostic system
  • 6U 19” rack-mounting
  • Up to 3 additional power supply units for redundancy


The Stagetec Nexus Star is a modular system, comprising 6U 19” rack-mounting chassis loaded with audio, control and processing cards as required. Referred to as the Nexus Star Base Device it provides 21 card slots allowing up to 16 interface boards and 2 main controller boards to be fitted. DSP cards can also be fitted to make this the processor and routing core for Stagetec Aurus or Crescendo mixing consoles.

Designed for use in extensively networked systems, the optimised routing matrix acts as the network core, managing routing functions across an entire facility. Capable of routing to a maximum of 31 Nexus Base Devices, the Nexus Star is able to route 4096 inputs to 4096 outputs (over 16 million crosspoints). Implementation of the Nexus Star is therefore ideal when networks become large, complex and spread across multiple locations.

Components for the Nexus Star:

  • RCX Controller and Matrix board
  • RSYNC Synchronisation board
  • RFOC Optical interface board for connecting to Nexus Base Devices
  • RMF MADI I/O board

RCX Controller board

A minimum of 1 RCX controller board is required for every Nexus Star Base Device. Integrating the main CPU and audio routing matrix, the RCX provides all control, monitoring and routing functions. For redundancy, a second RCX board may also be fitted. The redundant RCX board remains in ‘hot standby mode’ until required, with switchover being forced either manually or under program control.

The RCX board is fitted with ETHERNET, USB and two RS-232/RS-422 communications ports, allowing communication with external equipment for the purpose of system management and monitoring. Synchronisation ports on the RCX are provided as wordclock ‘in’ and ‘out’.

RSYNC Synchronisation board

As standard, Nexus Star can synchronise to its internal sync source, wordclock, any optical input  – including inputs from connected Nexus Base Devices and MADI if fitted. Installing the optional RSYNC Synchronisation board additionally allows the Nexus Star to synchronise to video Black Burst, AES3 or a separate wordclock reference signal.

RFOC Optical interface board

The RFOC (Router Fibre Optic Connection) board is the interface that links the Nexus Star to Nexus Base Devices throughout the networked system. A single board provides four independent duplex connections enabling a total of 256 I/O channels, control and sync data to be passed over optical fibre (negating the need for any additional cabling).

RMF MADI I/O board

The RMF (Router MADI Format) board, fitted with 4 x 64-channel MADI ports, allows simultaneous transmission of up to 256 inputs and 256 outputs. Each card has BNC connectors and may also be fitted with optional fibre optic LC interfaces for ease of connection to any external digital audio workstation, MADI equipped audio console or communication system such as the Delec Oratis.

All interface boards are certified by Dolby® to be bit-accurate and transparent to Dolby E.

Redundancy and reliability are key features within Nexus Star. A maximum of three back-up power supplies (no fans) can be mounted in the rear. Fibre optic links between Nexus Star and Base Devices can be mirrored. Nexus Star cards are all hot-swappable and come on-line within a few seconds of installation. An internal software monitoring system immediately detects any errors or failures in the Nexus network and reports the details to all connected control PCs or systems.

Nexus Star also has a powerful embedded control system called Logic, that manages internal Nexus Star functions or controls external systems. Nexus Logic operates independently of any computer and can be easily configured to provide complex customised control functions or messaging.


Stagetec Nexus Star Brochure – PDF


Meticulous Balance – The Sound Design for Follies at the Kennedy Centre – PDF

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