The NEXUS XET output board provides 4×2 AES/EBU or S/PDIF-compliant channels. The board is available in various versions with different ports (XLR, RCA coaxial, BNC, and TOSLINK optical). RJ45 or D-Sub terminals where all signals are transferred over a single port are also available for increased installation-friendliness. In addition, the XET-OR version provides both TOSLINK optical and electrical outputs (RJ45). The XET standard version can also be equipped with additional XET-S front-panel modules providing extra output ports. For example, implementing an XET-S option allows parallel optical outputs to be added to the XLR version. The four stereo channels can also be configured as mono channels and be routed freely and separately on the NEXUS system. The board also supports the legacy mode where a single-channel audio signal with double sample rate is transferred over an AES/EBU standard port. With the XLR version, the front panel can be detached from the board and be installed in an adjacent grid location (for example, a Base Device level with no backplane). The connection will then be established using a ribbon cable. This reduces the space requirements to 4 DU (XET-X).