The Cost-Effective AES/EBU Input Card for NEXUS Base Devices

The XER card is the digital gateway to the NEXUS world by receiving and evaluating AES/EBU data streams. A pragmatic operating concept ensures pleasant handling.

The XER cards provide connections for up to four two-channel digital AES/EBU signals. The signal processor integrated on the board makes it easy to handle the signals: the digital gain allows the level to be adjusted by ±20 dB; a fast limiter connected downstream ensures that the level cannot be exceeded, and with the phase inverter it is possible to invert the polarity of the signal if necessary. The sampling rate converter at each input makes it easy to receive and convert incoming data streams of any sampling frequency. Of course, a NEXUS system is capable of synchronizing the system clock to any digital input in reverse. The user bits contained in the AES/EBU data stream can be transmitted transparently throughout the system, which allows external systems from third-party manufacturers, such as command systems, to be wired via the NEXUS network and integrated with NEXUS.

The XER card with the legacy mode, which supports sampling rates of up to 192 kHz, meets the requirements for top-quality transmission. The XER board is also certified for the transmission of Dolby E signals. In a NEXUS system, Dolby E data streams can be transparently transported to AES/EBU outputs, distributed and output, decoded in the system and treated as separate audio signals.

XER NEXUS boards can be supplied with different front panels to fit seamlessly into any application scenario. Versions with XLR, BNC, RCA, Toslink, RJ45, or D-Sub connectors are available.

Available with XLR, BNC, Sub-D, RJ45, Cinch or Toslink Connectors

This module can optionally be supplied with different front panels, the electrical conversion remains the same. XLR sockets are suitable for constantly changing setups, while the Sub-D version is suitable for permanently wired installations. With the RJ45 variant, the four channels are connected to a socket and enable fast and cost-effective cable laying with conventional Cat5 cables (or better). The board is also available with the interfaces Cinch and Toslink, which are intended for receiving the consumer format S/PDIF.

Support of S/P-DIF Signals

Since the professional AES/EBU signal and the consumer format S/PDIF differ only in the electrical level, both formats can be received.

Adjustable Digital Gain

All inputs can be amplified or reduced by 20dB. A switchable limiter protects against overload.

Optional Sample Rate Converter

The optional sample rate converters in the inputs can be switched on manually or operated in auto mode; the board then automatically detects whether the incoming frequency corresponds to the NEXUS system clock.

Transparent Transmission of Additional Data in the AES3 Data Stream

The NEXUS network is able to transparently transmit an AES3 data stream including the additional data. If no data is available in transparent mode, Nexus internal data is output. In the case of additional data on only one channel, the data is taken over by the other channel.

Support of Legacy 96 / 192 kHz Audio Signals on both AES3 Channels

AES3 data in legacy format can be accepted and transferred by the XER card. They are available to the system as normal mono signals. Alternatively, they can also be transmitted unprocessed, transparently in the NEXUS system and output by an XET module.

Transparent Transmission of Compressed Audio Signals

The NEXUS XER board is able to transmit compressed signals that do not contain a linear PCM signal and output them elsewhere. Such data streams are automatically detected and can be muted by inserting a jumper.

Certified for Dolby-E Transmission

The XER card is certified for Dolby E data stream transmission by Dolby Laboratories, Inc. The signals can be transmitted via the NEXUS network to the XET, XHI or XMF boards and output there.

Technical Specifications :


Variant: XLR 1 x 8TE
XLR female 4x AES/EBU, S/PDIF Input
Variant: BNC 1 x 4TE
Variant: RJ45 1 x 4TE
RJ45 1x AES/EBU, S/PDIF Input
Variant: Cinch 1 x 4TE
Cinch 4x AES/EBU, S/PDIF Input
Variant: D-Sub 1 x 4TE
D-Sub 15 Socked female 1x AES/EBU, S/PDIF Input
Variant: Toslink 1 x 4TE
Toslink 4x AES/EBU, S/PDIF Input

Technical Specifications

Data Formats

Audio data 24-bit (w/ and w/o SRC)
Sample rates 44.1, 48, 88.2, 96 kHz (w/o SRC); approx. 30…200 kHz (w/SRC)
Ancillary data Evaluation and transparent forwarding of AES/EBU ancillary information: professional/consumer mode, audio/non-audio mode, emphasis mode, mono/stereo mode, copy-protection status, CRC status, original/copy
Error evaluation Parity error, confidence error, bi-phase error, PLL not locked, slipped sample
Non-audio Non-audio formats are transparently forwarded. DTS-CD, DTS-LD, Dolby-E and IEC 61937 (AC3, DTS, and MPEG) are detected.

Channel Configuration

  Phase inversion
  Preset limiter
  Separately enabled sample-rate converter (option)


Phase Free phase offset to system clock
Input Balanced; floating transformer isolation
Impedance 110 ohm (BNC: 75 ohm)
Ground bonding liftable (using jumper)
Gain –20…20 dB

Inputs XER-O

Connector TOSLINK/DNP (100 kHz max.)
Phase Free phase offset to system clock

Input Parameter

Dielectric strength ±7 V (typ.), –7…12 V (max.)
Input impedance 110 ohm (XLR, typ.); 75 ohm (RCA, typ.)
Input signal, Recommended eye diagram:  xer05 eyepatterndiag


Threshold –0,06 dBFS
Attack Time 0 samples
Hold Time 10 ms
Release Time 0,5 s
Ratio limiter

Operation Conditions

Temperature range 0° C to +50° C
Max humidity max. 90 %, non-condensing

Storage Conditions

Temperature range –35° C to +70° C
Max humidity max. 90 %, non-condensing

Power Supply

Voltage +4,75…5,25 V
Currrent 480 mA

Mechanical Data

Weight 0,26 kg
Downloads :

NEXUS / NEXUS Star Technical specifications




XER Technical specifications