Product Documentation

System requirements

Aug 21, 2014


HDX RealTime Optimization Pack 1.4.x supports only Microsoft Lync 2010.

HDX RealTime Optimization Pack 1.4.x supports the following Citrix environments:

  • XenDesktop 5.0, 5.5, 5.6, 5.6 Feature Pack 1, and XenDesktop 7
  • XenApp 6.0, 6.5, 6.5 Feature Pack 1, and 6.5 Feature Pack 2
  • VDI-in-a-Box 5.2

For more information about XenDesktop and XenApp editions that include Lync optimization, see the following:

HDX RealTime Connector

You install HDX RealTime Connector on XenDesktop virtual desktops or on servers in your XenApp farm.

  • Supported operating systems:
    • Desktops: Microsoft Windows 7 and 8
    • Servers: Microsoft Windows Server 2008 R2
  • Memory: minimum 4 GB RAM, 120 MB paging file
  • Disk space: minimum 100 MB available
  • Network interface: full-duplex Ethernet TCP/IP local network connection
  • Software:
    • DirectX 9 (minimum)
    • Microsoft .NET 3.5 SP1
    • Microsoft Lync 2010 (32-bit)

Installation prerequisite

Before installing HDX RealTime Connector on a host running Windows 7, turn off Administrator mode for Microsoft Lync.
  1. Right-click the Microsoft Lync shortcut on your Desktop or in the list of programs in the Start Menu and choose Properties.
  2. In the Properties dialog box, click the Compatibility tab.
  3. On the Compatibility tab, ensure the Run this program as an administrator checkbox is cleared.

HDX RealTime Media Engine/Client Device

You install the HDX RealTime Media Engine on the client device.

Make sure you have installed a certificate for the Microsoft Lync Server on the client device and that the certificate specifies the correct domains that are associated with the Microsoft Lync Server. The Certificate domains should match the SIP Addresses of Record that use the RealTime Connector and the HDX RealTime Media Engine. If there is more than one domain, make sure you list them in the Subject Name and Subject Alternative Name values on the Certificate. If you do not do this, your Citrix HDX RealTime Media Engine cannot authenticate with the Lync Server.

Important: Thin client manufacturers make changes to the specifications of a devices without notice. These lists apply to the configurations provided at the time of testing.

Supported terminals:

Dell Wyse

Model Processor Operating System
R90L 1.5GHz* AMD Sempron Microsoft Windows XP E
R90LE 1.5GHz AMD Sempron Microsoft Windows XP E
R90LW 1.5GHz AMD Sempron WES 2009
R90LEW 1.5GHz AMD Sempron WES 2009
R90L7 1.5GHz AMD Sempron WES 7
R90LE7 1.5GHz AMD Sempron WES 7
Z90SW AMD G-T52R 1.5GHz WES 2009
Z90DW Dual core AMD G-T56N 1.65GHz WES 2009
Z90S7 AMD G-T52R 1.5GHz WES 7
Z90D7 Dual core AMD G-T56N 1.65GHz WES 7
Z90DE7 Dual core AMD G-T56N 1.65GHz WES 7
D90D7 AMD G-T48E 1.4Ghz WES 7
D90Q7 AMD GX-415GA SOC 1.5GHz WES 7
Z90D8 Dual core AMD G-T56N 1.65GHz WE8S
D90D8 AMD G-T48E 1.4Ghz WE8S
D90Q8 AMD GX-415GA SOC 1.5GHz WE8S
Z50S AMD G-T52R 1.5GHz SUSE Linux 11 SP1/SP2
Z50D Dual core AMD G-T56N 1.65GHz SUSE Linux 11 SP1/SP2
R50L 1.5GHz AMD Sempron SUSE Linux 11 SP1
R50LE 1.5GHz AMD Sempron SUSE Linux 11 SP1
X50m Dual core AMD G-T56N 1.65GHz SUSE Linux 11 SP1/SP2
D50D AMD G-T48E 1.4Ghz SUSE Linux 11 SP2


For the combination of an HP T610 terminal with HP Thin Pro (Ubuntu Linux 10.04), the following issues can occur:
  • Before you run the Citrix HDX RealTime Media Engine on a terminal, obtain a patch from Hewlett-Packard to fix a problem with the PulseAudio service.
  • If you insert a new audio device on a terminal and the device is not recognized by the Citrix HDX RealTime Media Engine or the Citrix HDX Realtime Connector for Microsoft Lync software, reboot the terminal.
Model Processor Operating System
T610 AMD Dual Core 1.6 ghz Ubuntu 10.04
T610 AMD Dual Core 1.6 ghz WES 7


Model Processor Operating System
C32 Dual core Intel D2550 1.86 GHz WES 7
EI945-3 Dual core Intel D2550 1.86 GHz WES 7


IGEL claims support for the HDX Optimization Pack with all of its Linux thin clients as of Version 4.10.100.

Supported operating systems

You can install HDX RealTime Media Engine on devices running any of the following operating systems:

  • Macintosh OS X 10.6, 10.7, or 10.8 with 41.4 MB of free disk space
  • Microsoft Windows 7, Microsoft Windows 8, Microsoft Windows 8.1, or Microsoft Windows XP
  • Microsoft Windows devices: WES 7, WES 2009, Microsoft Windows XPe, or Microsoft Windows Thin PC (TPC)
  • Linux (Ubuntu 11, Ubuntu 10.04, or RedHat 6.2)
  • Linux (SUSE Enterprise SP1/SP2)
  • Unicon claims support for the HDX Optimization pack for Microsoft Lync 2010 on eLux RP 4.3.0.

Requirements for audio and video calling:

  • RealTime Connector can support video calls in high-definition (HD) video. The RealTime Media Engine measures the speed of the user device and then encodes HD video if the camera, the host device, the bandwidth setting, and the remote endpoint support high-definition specifications.
  • Camera:
    • Most USB webcams are supported. The Logitech Webcam models B910 or C920 are recommended.
    • Resolution: 320 x 240
    • Color space: 1420 or YUY2
    • Frame rate of at least 10 fps, 24 fps for HD video
    • Native driver or supporting Windows UVC driver
  • Audio input/output must be DirectSound-compatible and capable of 16-bit mono or stereo sound at 16,000, 32,000, or 44,100 samples per second. A USB headset is recommended.

Requirements for Lync-compatible USB telephone calling:

HDX RealTime Connect supports Lync-compatible USB telephone devices, including wired and wireless phones, speaker phones, and headsets. For full information about supported devices, see the Microsoft USB device specification:

This document defines several categories of USB connected devices and requirements for those devices to support specific USB commands.

Citrix Receiver requirements:

The terminal device must have one of the following Receivers installed:

  • Citrix Receiver for Mac 11.5 or 11.6
  • Citrix Receiver for Windows 3.1 or 3.0
  • Citrix Receiver for Linux 12.0

Third-party video drivers and Citrix HDX RealTime Optimization Pack

The Microsoft Windows operating system installed on some thin client terminals often does not include Windows USB video class (UVC) drivers for web cameras, although these drivers have been included with standard Microsoft Windows XP and Vista operating systems since SP2. When you install a web camera on a terminal device, the installation program may report that it does not have required files.

We recommend that you use the standard Windows device drivers for webcams because vendor-supplied drivers can sometimes cause crashes and BSOD events on certain platforms (especially 64-bit Windows).