Mixed Signal xNode2 Boot Issue Related to AES3 Input Signal

Updated
  • Updated on Feb 16, 2026
  • Published on Feb 16, 2026
  • 1 minute(s) read
  • Bryan Jones
  • DG
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Scope

This document applies SPECIFICALLY and ONLY to the 2001-00622-000: xNode2 Mixed.  The Mixed xNode2 features an XLR input and two 15-pin D-connector GPIO ports on the back. Indicated here in green.

Symptoms

  1. The unit in question is a Mixed Signal xNode2

  2. An AES3 signal is being applied to the unit’s AES3 input

  3. When power is applied, the unit does not boot, and the front panel LED flashes

  4. Removing the AES3 connection allows the unit to boot.

Cause

If the AES3 input signal voltage is higher than expected, it can couple through internal components during power-up. This can interfere with the normal startup sequence and prevent the unit from booting. This is independent of the audio encoded on the AES3 line; it can even happen if the AES3 signal encodes silence.

This condition is related to internal hardware behavior and is not caused by xNode2 configuration or firmware version. It may occur even when the connected AES3 source equipment is operating within specification.

Workaround

Telos will address this condition in future hardware revisions by updating the internal PCB design. Until then, an external attenuation pad may be used to reduce the AES3 signal voltage presented to the input.

Installing an inline attenuation pad in the AES3 cable typically prevents the condition from occurring.

Example Attenuation Pad

The diagram below shows an example inline attenuation pad suitable for installation in an AES3 RJ-45 cable.

Example Component Values

  • R1: 1000 Ω

  • R2: 1000 Ω

  • R3: 22 Ω

  • R4: 22 Ω

This network provides approximately 3.5 dB of attenuation while maintaining proper impedance characteristics for AES3 signals.

Installation Notes

  • The attenuation pad should be installed inline with the AES3 cable feeding the xNode2 input.

  • The pad may be built into a short adapter cable or installed within an RJ-45 inline enclosure.

  • Maintain proper twisted-pair wiring practices to preserve AES3 signal integrity.

  • This workaround does not affect normal AES3 operation.

Resolution Status

This issue will be addressed in future hardware revisions of the Mixed Signal xNode2.

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