Components

XER-M Version for Digital Microphones

The XER-M version of the board supports digital microphones compliant with AES-42, Mode 1. It provides not only digital phantom power (DPP) but also microphone-specific signal processing features such as subsonic filters, pad, and limiting. The gain can be set within a range of -20 and 40 dB.
The standardized microphone parameters are viewed and/or set using the NEXUS control program. They include:

• Factory ID, model ID, and serial ID
• Synchronisation mode, pad, EQ settings, and polar pattern
• Signaling
• Wireless-microphone messages (»Low Battery«, »Link Loss«, »Squelch«)

Non-Audio and Legacy Modes

The XER board detects data streams that do not contain Linear PCM audio. It allows for automatically muting this data (jumper setting); in this way, non-audio data can be transparently forwarded across the NEXUS system and can be output, for example, from a XET AES/EBU output board.
AES/EBU legacy-format audio (96/192 kHz) can also be fed to the XER inputs. The mono signal encoded with double sample rate on the two AES/EBU audio channels is decoded and made available on the NEXUS system by the XER board.
In addition, legacy data can be transparently forwarded and output, for example, from NEXUS systems using the same sample rate (e.g. 48 kHz).
Of course, legacy-format data can also be converted to the current NEXUS system rate using sample-rate converters. They will then be available as normal mono signals on the entire system.

DSP Built-in

The integrated signal processor allows for digital gain adjustment immediately at the system input. This allows, for example, for matching signals with different headroom settings. The gain of each input signal can be set within a range of ±20 dB. In addition, the signal phases can be inverted.
Next, a fast preset limiter is implemented to prevent clipping of amplified signals. This ultra-fast limiter (attack time: 0 samples) only responds at a level of only -0.06 dBFS, so impacts on audio signals are impossible at normal levels.

Synchronisation

Each stereo input of the XER board can be used to synchronise the overall NEXUS system.

Ancillary Data

With the sample-rate converters disabled, ancillary information can be transparently and entirely transferred in stereo mode on the NEXUS system. In addition, the NEXUS allows for re-generating ancillary data for synchronous and asynchronous sources using the XCPU board.
Various NEXUS output boards even allow for forwarding the input ancillary information or generating new data. Moreover, the XER-M version reads the channel status and other status data sent by the microphone.
 

XEOX - Adaptor for AES/EBU-LWC Converter

The benefits of transmitting AES/EBU signals via fibre-optic lines – such as large spanning distances of up to 2,000 meters, insusceptibility against EMI, and full galvanic isolation of transmitter and receiver – are made available by the optoXLer optical converter by Connex. The optoXLer converts differential AES/EBU signals to optical signals and vice versa. This method allows for bit rates of up to 10 Mbps.
The electronic converter components are incorporated in a modified XLR connector and are plugged directly into the XLR port. The optoXLer is available as a transmitter or receiver equipped with male or female XLR-3 terminals respectively.
Connectivity to fibre-optic lines is provided within the XLR adaptor using a F-SMA standard connector.
The optional XEOX module allows for using optoXLers with NEXUS XET boards. The module is just plugged onto a terminal strip on one of the participating boards.