Dragon NaturallySpeaking and citrix
A White Paper from Nuance Communications March 2009
DRAGON NATURALLYSPEAKING - CITRIX

Introduction

As the number of deployed enterprise applications increases, organizations are seeking solutions that simplify application delivery without sacrificing performance security or cost. Citrix Systems has been providing innovative software solutions that enable the best delivery methods for all applications. The Citrix ICA thin client architecture provides a centralized, scalable and secure application delivery platform that can benefit organizations of all sizes. Citrix is one of the most trusted names in Application Delivery Infrastructure. More than 215,000 organizations worldwide rely on Citrix to deliver any application to users anywhere with the best performance, highest security and lowest cost. Citrix customers include 100 percent of the Fortune 100 companies and 99 percent of the Fortune Global 500, as well as hundreds of thousands of small businesses and prosumers. The latest release of the award-winning Dragon NaturallySpeaking voice recognition software from Nuance Communications supports deployments within a Citrix Presentation Server environment. This reference guide shows how customers can benefit from using Dragon NaturallySpeaking in a Citrix environment. This white paper supplements the Dragon NaturallySpeaking IT Administrators Guide which explains how to install and configure Dragon NaturallySpeaking on Citrix servers.
2009 Nuance Communications, Inc. All rights reserved.

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Citrix Overview
Citrix provides a server-based centralized architecture to deliver applications to end users. In Citrix, all application processing and logic occur on the server; the client PCs only display data and allow the user to interact with the graphical user interface of the program. This approach is ideal for highly distributed environments where the administrative costs of maintaining a consistent PC desktop image are problematic or in scenarios where bandwidth and or client PC processing power is limited. Citrix also simplifies the process for updating software functionality by eliminating the need for end users to reboot the client PC. Nuance Communications understands the value that Citrix brings to large organizations and it is for this reason that Dragon NaturallySpeaking supports deployment in Citrix thin-client environments.
Benefits of Running Dragon NaturallySpeaking on a Citrix Server
Dragon NaturallySpeaking supports installation on a Citrix Presentation Server, enabling users to dictate from workstations that do not have Dragon NaturallySpeaking installed. Deploying Dragon NaturallySpeaking in a Citrix environment delivers the following features and benefits

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FEATURES
Standard Application Access Centralized Management & Administration Secure

DESCRIPTION

Access to Dragon NaturallySpeaking functionality via consistent and homogeneous methods Deploy and manage all Dragon NaturallySpeaking users through Citrix management console Allows the administrator to control which end users have access to Dragon NaturallySpeaking Eliminates the time and effort of installing Dragon NaturallySpeaking on client workstations Permits the use of client workstationsthat do not meet the system requirements for Dragon NaturallySpeaking Users are able to utilize the same dictation functionality through Citrix that is available in the standard Dragon NaturallySpeaking desktop version. Leverage proven Citrix support for automatic fail-over and load balancing

BENEFITS

Simplifies end-user training for consistent end-user experience Reduced administrative overhead lowers total cost of ownership Ensures that only authorized users have access to Dragon NaturallySpeaking Lower administration costs; enables fast application deployment even for highly distributed or mobile organizations Enables deployment of complete Dragon NaturallySpeaking functionality on PCs that do not meet standard Dragon NaturallySpeaking desktop requirements Enables the application integration features of Dragon NaturallySpeaking, such as Select-and-Say, Say-what-you-See, and Natural Language commands, to be used with applications running on a server Deploy Dragon NaturallySpeaking in distributed high transaction volume environments with high availability security.

Simplified Application Deployment
Reduced PC Client-Side Hardware Requirements
Full Dragon NaturallySpeaking Functionality

Scalable and Reliable

Specifications and Deployment
Nuance provides support for deploying and running Dragon NaturallySpeaking in a Citrix environment. Customers of Dragon NaturallySpeaking must purchase a license for each speaker that creates a user profile in Citrix. Note that Citrix support is only available in the Dragon NaturallySpeaking Professional, Legal and Medical editions. Deploying Dragon NaturallySpeaking requires the following Citrix components: Server: Citrix Presentation Server 4.0 on either Microsoft Windows Server 2003 Microsoft Windows 2000 Advanced Server

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Client: Citrix ICA client 8.x or 9.x on either Microsoft Windows 2000 Service Pack 4 Microsoft Windows XP Service Pack 1 Microsoft Windows XP Service Pack 2
Sizing and Configuring Dragon NaturallySpeaking in Citrix Key Issues to Consider
Organizations considering deployments of Dragon NaturallySpeaking in a Citrix environment need to consider several items for configuring the Citrix environment and scaling client usage on Citrix servers. This section provides some basic guidelines on how to address these issues to ensure maximum performance. Please note these are guidelines only and not definitive specifications-actual performance will vary from customer to customer. Deploying Dragon NaturallySpeaking in a Citrix environment must consider the following three items 1. Projected user base and usage metrics 2. Server-side hardware 3. Network bandwidth

1. Projected User Base

Before considering any deployment of Dragon NaturallySpeaking in Citrix, organizations need to answer key questions about the user base and potential growth. These metrics are essential since they are needed to size the appropriate network and hardware requirements. How many users do you plan to enable access to Dragon NaturallySpeaking through a Citrix environment in the first 6 months? 12 months? What is the projected distribution of simultaneous user access to Dragon NaturallySpeaking in a Citrix environment? Where will these users be physically distributed? On the same corporate LAN, WAN, remote access or combination?

2. Server-Side Hardware

Dragon NaturallySpeaking has been tested to run in a Citrix enterprise environment configured with Citrix Presentation Server 4.0, and clients running Citrix ICA thin-client software. Based on answers to question #1, your organization will need to scale and deploy an appropriate number of Windows servers to run Citrix Presentation Server 4.0 to support all your Dragon NaturallySpeaking users. In the appendix, we provide some baseline performance data using standard Windows hardware.

3. Network bandwidth

The request for network bandwidth when running Dragon NaturallySpeaking derives primarily from requests issued on the virtual audio channel. Nuance recommends and checks for use of the high-quality sound on Citrix to ensure the highest quality of accuracy for speech recognition. Based on the user population you intend to serve, you must account for and allocate the appropriate amount of network bandwidth for users to be able to utilize Dragon NaturallySpeaking 9 from a Citrix client. For information about setting sound quality on Citrix ICA clients, refer to the Dragon NaturallySpeaking IT Administrators Guide in the supplied documentation.

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APPENDIX
Preliminary Test Results of Running Dragon NaturallySpeaking in Citrix
Listed below are the results of Nuances internal testing of Dragon NaturallySpeaking in a Citrix environment.This information stated is only meant to provide guidance for setting up your Citrix environment-it is not a definitive specification. Your experience using Dragon NaturallySpeaking with Citrix may vary, depending on many factors that may not be addressed in this brief overview. This appendix should help you accurately size what is required within your Citrix environment for Dragon NaturallySpeaking. The internal Nuance testing of Dragon NaturallySpeaking with Citrix utilized the following components: SERVER SPECIFICATIONS Server Hardware Dell PowerEdge 2850 Processor: Dual Intel Xeon single-core processor, 3.16 GHz/1MB cache, 800 MHz FSB Memory: 4GB DDRMHz (4x1GB), single ranked DIMMs Hard Drive: 146GB 10K RPM Ultra 320 SCSI Hard Drive Network Card: Dual Onboard NICs Dell PowerEdge 6850 Processor: Quad Intel Xeon single-core processor, 3.16 GHz/1MB cache, Redundant Memory: 8GB DDRMHz (8x1GB), single ranked DIMMs Hard Drive:146GB 10K RPM Ultra 320 SCSI Hard Drive Network Card: Dual Onboard NICs Server Hardware Windows Server 2003 Published applications: Dragon NaturallySpeaking Professional, Medical and Legal editions Dragon NaturallySpeaking Audio Client Update Microsoft Outlook Microsoft Word 2003 Client Software Citrix client user interfaces: ICA 32-bit clients, version 8.x and 9.x Program Neighborhood Program Neighborhood Agent Web Client PC Client Specifications Dell Optiplex GX 260 with Windows XP 512 RAM and 2 GHz CPU Sound card: Sound Blaster Live! And also on-board sound systems Network Specifications Network speed: 100 Mbps Fast Ethernet Network environment and active software run on the server: Latest Citrix Presentation Server 4.0 service packs were installed; available from www.citrix.com Citrix tools for CPU and memory management were activated to optimize server performance.

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An unspecific amount of corporate network traffic was present during testing that was not generated by the Citrix transactions created by running Dragon NaturallySpeaking. NOTE: no additional high-memory or CPU-consuming applications were active during testing

INITIAL RESULTS

CPU Consumption and Memory Usage Running Dragon NaturallySpeaking
The following tables show the CPU time and memory usage observed on the Citrix servers with Dragon NaturallySpeaking running. The CPU time represents the total time (expressed as a percentage) used by a single client session; the percentage is a total of available CPU. Memory usage is also represented for a single-user session as a percentage of total RAM available. Peak CPU consumption is reached when Dragon NaturallySpeaking user profiles are being opened, saved and closed. Acoustic training appears to consume the most amount of CPU time for any process executed with Dragon NaturallySpeaking on Citrix. As such, administrative procedures that run any training process need to take this into consideration CPU consumption, with one user dictating and correcting in the DragonPad
CPU time (Dual processor) CPU time (Quad processor)

Average

10% 5%

25% 13%

CPU consumption, performing General Training in New User Wizard, Additional Training or running the Acoustic Optimizer

25% 12%

30% 18%
Memory consumption, with one user dictating and correcting in the DragonPad
RAM required for both Dual and Quad processors

130 MB

160 MB
When other applications are running concurrently with Dragon NaturallySpeaking: Dragon NaturallySpeaking consumes the same amount of CPU time as it does when it runs alon e Memory usage for Dragon NaturallySpeaking will increase

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For example, memory usage for Dragon NaturallySpeaking goes up when running together with Microsoft Word 2003.
RAM required for a single session, Dragon/Microsoft Word 2003 When Dragon NaturallySpeaking is not being used: 160 MB

190 MB

CPU time consumed is 0. The same amount of RAM is required Network bandwidth is 1.3 Mbps bandwidth if the microphone is active; 0 Mbps if the microphone is turned off.

Network Bandwidth The network bandwidth setting for a single Dragon NaturallySpeaking Citrix client MUST be at least 1.3 Mbps.
For information about setting sound quality on Citrix ICA clients, refer to the Dragon NaturallySpeaking IT Administrators Guide in the supplied documentation. NOTE: If the microphone is turned off for an active DNS session running on Citrix, network bandwidth on a channel drops almost to 0.

Summary

Based on the foregoing observations made while testing a single Dragon NaturallySpeaking session running on Citrix, it is reasonable to conclude that deployment of Dragon NaturallySpeaking will scale linearly in a Citrix Presentation Server environment. CPU consumption emerges as the most important limiting factor, as collective CPU time per session will determine how many Dragon sessions can be active at the same time. Using the hardware and software configurations detailed in the appendix, here is the approximate range of Dragon NaturallySpeaking sessions that can be expected to run on the Citrix Presentation Server 4.0 utilizing the hardware and software configurations outlined in the appendix: Maximum Load: In a realistic scenario, where multiple sessions are performing different types of activities (opening, saving and closing users, dictating, and correcting dictation), it can be expected that 6 concurrent Dragon NaturallySpeaking 9/Citrix sessions can be executed. Minimum Load: Expect to run 4 concurrent Dragon NaturallySpeaking/Citrix sessions in the case when all Dragon NaturallySpeaking sessions are running acoustic training.

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About Nuance Communications, Inc.
Nuance (Nasdaq: NUAN) is the leading provider of speech and imaging solutions for businesses and consumers around the world. Its technologies, applications and services make the user experience more compelling by transforming the way people interact with information and how they create, share and use documents. Every day, millions of users and thousands of businesses experience Nuances proven applications and professional services. For more information, please visit www.nuance.com.
About Citrix Systems, Inc.
Citrix Systems, Inc. is the global leader and the most trusted name in Application Delivery Infrastructure. More than 215,000 organizations worldwide rely on Citrix to deliver any application to users anywhere with the best performance, highest security and lowest cost. Citrix customers include 100 percent of the Fortune 100 companies and 99 percent of the Fortune Global 500, as well as hundreds of thousands of small businesses and prosumers. Citrix has approximately 8,000 partners in more than 100 countries. Annual revenue in 2008 was $1.6 billion.