XRT is part of the fourth generation of NEXUS system fibre-optic boards. For the first time it decouples the audio routing of the fibre-optic interfaces from the base device‘s backplane, increasing its routing capacity. The capacity of each fibre-optic connector can be distributed dynamically among different tasks. XRT enables routing of both audio data and Ethernet tunnels in the NEXUS fibre-optic network. XRT constitutes its own router with a minimal space requirement of just one board, and enables the creation of complex and powerful audio networks using NEXUS base devices.