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Is the HDL300 system compatible with Polycom® RealPresence® Group 500?

Yes. To connect the HDL300 system with the Polycom RealPresence Group 500, two custom cables are needed.


Creating custom cables

Cable 1: Prepare a 3-conductor 3.5 mm jack cable with the three pins, positive (+), negative () and ground (), as described in the Nureva auxiliary port recommendations.

Cable 2: Prepare a second 3-conductor 3.5 mm jack cable with the three pins, positive (+), negative () and ground (), as described in the Nureva auxiliary port recommendations.


On your PC

  1. Connect a USB-A to USB-B cable from your laptop 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 =>
      1. Microphones => set the mic level to 80%
      2. Speakers => set the volume level to 100%
      3. Auxiliary ports
        1. Aux out => Microphone out (Mic level)
        2. Sleep mode => Disable
  4. Disconnect the connect module from your laptop and remove the USB cable.


On the connect module

  1. Plug Cable 1 into the Aux out port
  2. Plug Cable 2 into the Aux in port
  3. Connect the PoE cable (provided) to the RJ45-1 port on the connect module to the rear RJ45 port on the HDL300 system
  4. Plug in the 54VDC power supply


On the Polycom RealPresence device

  1. Plug Cable 1 into the audio Input 3.5 mm stereo line level
  2. Plug Cable 2 into the audio Output 3.5 mm stereo line level
  3. Connect the Polycom Group 500 to the network using the LAN port
  4. Connect the power supply as described in the Polycom user manual


To configure a Polycom Realpresence Group 500 system to use the HDL300 system directly connected to the Audio input 1 port

  1. Open the Polycom web interface
  2. Go to Admin Settings → Audio/Video/Content → Audio → Audio Input

  1. Enable "Use 3.5 mm Input for Microphone"
  2. Disable "Echo Canceler." The HDL300 system provides like-out echo-cancellation.
  3. Adjust the input level using the gain slider. Test the adjustments in a test call.


Additionally, make sure the following Polycom features are disabled:

         Automatic gain control
Instant adaptation echo cancellation
         Automatic noise suppression
Audio error concealment
         Keyboard noise reduction
Polycom Siren™ Lost Packet Recovery
        Polycom NoiseBlock™ technology
Polycom Stereo Surround™ technology
         Polycom Acoustic Fence™
Activelip synchronization
         Live music mode
Instant adaptation echo cancellation


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.


Last updated: January 14, 2020

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