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Is the HDL300 system compatible with the Cisco® SX20?

Yes. To connect the HDL300 system with Cisco Telepresence® SX20 CODEC, you'll need 

  • A third-party mic-level balance signal converter (Nureva recommends Rapco's LTIGLBLOX converter with a 3.5mm connector pigtail)
  • Cable 1: Prepare a 4-conductor 3.5mm jack connector to XLR cable (Nureva recommends Revolabs 07-XLRTO35M4-01)
  • Cable 2: Prepare a 3-conductor 3.5mm to 3.5mm cable


On the HDL300 Connect Module

  1. Connect USB-A to USB-B from your laptop to the Connect Module
  2. Download and run Nureva Room Manager
  3. In Nureva Room Manager, under 
    1. Product updates => Check for firmware updates
    2. Audio conferencing system => Controls
      1. Microphones => set the mic level to 80%
      2. Speakers => set the volume level to 100%
      3. Auxiliary ports
        1. Aux out => Microphone out (Line level)
        2. Sleep mode => Disable
  4. Disconnect the connect module from your laptop and remove the USB cable.
  5. Connect the 3.5mm cable from the LTIGLBLOX to the Aux out port 
  6. Connect Cable 2 to the Auxiport
  7. Connect the PoE cable (provided) to the RJ45-1 port on the connect module to the rear port on the HDL300 system
  8. Plug in the 54VDC power supply and connect a laptop to the connect module using the USB-A to USB-B cable (provided)


On the Cisco SX20 CODEC

  1. Connect Cable 1 between the LTIGLBLOX XLR port to the ‘Microphone 1’ port (blue) on the back panel of the SX20
  2. Connect Cable 2 into the 'Speaker Out' port (black)
  3. Plug in the 12VDC power source
  4. In the SX20 CODEC control software
    1. Ensure the latest Firmware is loaded
    2. Set Input Microphone Mode -> ON
    3. Set Audio Input Microphone controls (EchoControl Mode, Noise Reduction, and Dereverberation) -> OFF
    4. Set Audio Input Microphone Level -> 0 dB

Connection Diagram

NOTE: The Nureva Aux In / Out connections are single-ended, unbalanced signals with default maximum output signals as given in the table below. Any equipment requiring voltages below these levels may result in clipping, distortion, and, in extreme cases, damage to connected systems. Equipment requiring voltages above these levels will not be adequately driven by the HDL300 system’s output signal and may result in quiet / no audio on the channel. Before connecting to the Nureva Connect Module, make sure the third-party device voltage levels are adequate or adjusted properly by additional interfacing hardware.

NOTE: When using the Rapco direct-inject (DI) converter, if you experience a hum or buzz during a call, you may need to toggle the GRND - LIFT switch to account for possible Earth or ground loops.


Last updated: May 28, 2020

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