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Telepresence Testing Approach by Shenick


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Presented at IMTC Telepresence Workshop
June 15, 2010
Jesi, Italy

describes issues and solutions associated with Telepresence system testing

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Telepresence Testing Approach by Shenick

  1. 1. Mark Lambe Product Marketing Manager Shenick Network Systems Use of Traffic Emulation in Interoperability Testing
  2. 2. Overview <ul><li>Telepresence is the delivery of high performance voice and video which plays a critical role in service differentiation. </li></ul><ul><li>A clear understanding of quality and performance limitations under a variety of operational conditions, including interoperability, is imperative to success. </li></ul><ul><li>Today’s discussion covers the benefits of adopting real-time, per end point user emulation and analysis to deliver a highly credible and pragmatic quality test program. </li></ul>
  3. 3. Define Interoperability <ul><li>Interoperability means different things to different people at each stage </li></ul><ul><ul><li>The Telepresence deployment will function correctly i.e. each component in the system can communicate and operate with each other. </li></ul></ul><ul><ul><li>The Telepresence deployment operates correctly on the proposed infrastructure with minimum disruption. </li></ul></ul><ul><ul><li>The Telepresence deployment will operate alongside other services (video, voice, data) without impacting QoE/QoS. </li></ul></ul><ul><ul><li>The use of different Vendor end-point systems/components. </li></ul></ul><ul><li>Telepresence has unified the way we communicate </li></ul><ul><ul><li>Therefore a unified test solution covering all aspects of Interoperability is required. </li></ul></ul>Vendor Interoperability
  4. 4. System Functionality <ul><li>Emulate the most realistic components, therefore giving the most accurate results </li></ul><ul><ul><li>A Complete test process - examine performance from end-point boot-up to call ended </li></ul></ul><ul><li>Performance test configuration/management server responses </li></ul><ul><ul><li>Ability of end-points to connect to management servers </li></ul></ul><ul><ul><li>Time to download end-point firmware settings, upgrades, etc </li></ul></ul><ul><ul><li>Time to register through to time to join calls </li></ul></ul><ul><li>Participate in real/live Telepresence calls </li></ul><ul><ul><li>Measure actual video/audio quality </li></ul></ul><ul><li>Security Testing </li></ul><ul><ul><li>Attempt registration with un-assigned MAC addresses </li></ul></ul>
  5. 5. Operational Functionality <ul><li>Preliminary testing </li></ul><ul><ul><li>Network Performance </li></ul></ul><ul><ul><ul><li>Connectability – End-points can communicate with management servers </li></ul></ul></ul><ul><ul><ul><ul><li>What impact will firewalls have on Telepresence traffic flows coming from unsecure to secure networks </li></ul></ul></ul></ul><ul><ul><ul><li>Test Telepresence management servers under varying network and load conditions </li></ul></ul></ul><ul><ul><ul><ul><li>If a DDoS attack occurs at the firewall, what impact has this on the Telepresence conference </li></ul></ul></ul></ul><ul><ul><li>Hardware Performance </li></ul></ul><ul><ul><ul><li>Determine latency measurements </li></ul></ul></ul><ul><ul><ul><li>CPU Processing performance limitations </li></ul></ul></ul><ul><ul><li>Quality </li></ul></ul><ul><ul><ul><li>Test end-to-end video/audio quality using perceptive analysis tools </li></ul></ul></ul><ul><ul><ul><li>Test bandwidth performance use various video grades (low, medium, high resolutions) </li></ul></ul></ul><ul><li>Classification Testing </li></ul><ul><ul><li>QoS Testing </li></ul></ul><ul><ul><ul><li>Are Telepresence flows identified and handled correctly </li></ul></ul></ul><ul><ul><ul><li>False negative tests – test with flows of similar nature ( e.g. P2P) </li></ul></ul></ul><ul><ul><ul><li>False positive tests – a Telepresence flow is identified and handled incorrectly </li></ul></ul></ul>
  6. 6. Meeting Functionality <ul><li>Flow Control Testing </li></ul><ul><ul><li>Video Switching – test video switching policies </li></ul></ul><ul><ul><ul><li>who has the floor testing </li></ul></ul></ul><ul><ul><ul><li>Who is shouting the loudest to win control of the screen </li></ul></ul></ul><ul><ul><ul><li>Sporadic Interruption through dynamic behaviour or un-muting of a participant </li></ul></ul></ul><ul><ul><li>Audio – test the capability to deliver every end-points audio flows </li></ul></ul><ul><ul><ul><li>a heated discussion </li></ul></ul></ul><ul><li>Security feature Testing </li></ul><ul><ul><li>Assess muted room appearance functionality </li></ul></ul><ul><ul><li>Attempt to join conference with unknown/un-invited </li></ul></ul><ul><ul><li>numbers </li></ul></ul>
  7. 7. Emulated Telepresence Activity <ul><li>Per Flow Emulation & Performance Analysis </li></ul><ul><ul><li>Emulate real stateful end-points, with real user activity </li></ul></ul><ul><ul><ul><li>Register with Telepresence Management Servers </li></ul></ul></ul><ul><ul><ul><li>Participate in real calls </li></ul></ul></ul><ul><ul><li>Accurate representations of real world devices </li></ul></ul><ul><ul><ul><li>Per end-point unique MAC address assignment </li></ul></ul></ul><ul><ul><ul><li>Static and Dynamic IP address allocation </li></ul></ul></ul><ul><ul><ul><li>IPv4 and IPv6 capabilities </li></ul></ul></ul>diversifEye’s flexibility enables users configure device properties easily, matching those in the Telepresence device management database
  8. 8. Real User Activity <ul><li>Participation with as close to real activity is key in performance testing Telepresence systems and deployments, dynamic behavior adds a level of un-predictability to the likely results outcome </li></ul><ul><ul><li>Unique video and audio per emulated Telepresence </li></ul></ul><ul><ul><li>end-point </li></ul></ul><ul><ul><li>Ability to vary codecs for video and audio </li></ul></ul><ul><ul><li>Auxiliary inputs e.g. Videos, Presentations </li></ul></ul><ul><ul><li>Dynamic behaviour to emulated end-points </li></ul></ul><ul><ul><ul><li>Loudness (peak level, duration, etc) </li></ul></ul></ul><ul><ul><ul><li>Mute / Un-mute calls in live tests </li></ul></ul></ul>Shenick’s diversifEye enables users set various levels of loudness per emulated Telepresence end-points Mute / Un-mute calls during live tests
  9. 9. Sample Performance Analysis <ul><li>Measure performance on each and every individual emulated Telepresence end-point </li></ul><ul><ul><li>In multi-point calls determine how varying network architectures/settings impact call performance </li></ul></ul><ul><li>Sample Performance Metrics per unique Telepresence end-point </li></ul><ul><ul><li>Video Quality – Use perceptive analysis tools to deliver MOS scores </li></ul></ul><ul><ul><li>Audio Quality – Use perceptive analysis tools to deliver MOS scores </li></ul></ul><ul><ul><li>RTP Bandwidth – bits or packets per second </li></ul></ul><ul><ul><li>SSRC rate – Sent / received </li></ul></ul><ul><ul><li>RTP packet metrics – Dropped/Duplicate </li></ul></ul><ul><ul><li>RTP Video frame count / Video frame jitter </li></ul></ul><ul><ul><li>Out Calls Attempted / Established / Rejected </li></ul></ul>Shenick’s diversifEye delivers real-time results analysis, on a per emulated Telepresence end-point basis. Examine during live tests the impact of different traffic volumes and application types
  10. 10. Open Test Strategy <ul><li>Telepresence will run in parallel to other services such as voice, video and data. </li></ul><ul><ul><li>It’s essential to determine the impact Telepresence deployments have on existing services </li></ul></ul><ul><ul><li>It’s also important to understand how Telepresence is impacted by adding other traffic sources and varying these flows loads. </li></ul></ul><ul><ul><li>Test with both legitimate and illegal traffic flows, spam, virus, worms, DDOS, etc </li></ul></ul><ul><li>In the following open test scenario </li></ul><ul><ul><li>What’s a relevant / realistic MOS score for Telepresence in live networks? </li></ul></ul><ul><ul><li>Who would you perceive as the happiest customer? </li></ul></ul>4.5 4.6 3 VoIP MoS 2,000 5,000 950 Email send time (ms) 10 1 25 HTTP Downloads (seconds)  P2P traffic flows (present) 4.2 / 4.4 Enterprise C 3.9 / 4.0 Enterprise B 4.5 / 4.5 Enterprise A Telepresence MOS (video / audio)
  11. 11. diversifEye <ul><li>diversifEye emulates stateful clients with real world functionality and features for Telepresence </li></ul><ul><li>diversifEye provides stateful traffic emulation of many common applications and traffic flow types: </li></ul><ul><li>IGMP / MLD, VoD (RTSP), VoIP, Dual Hosted VoIP, RTP, PPPoE, HTTP, P2P, VLAN, DHCP, P2P TCP Playback, SMTP, POP3, FTP, TWAMP, SSL/TLS </li></ul><ul><li>Mix legal and illegal flows: include DDoS type attacks, emails with vrius, spam attacks, etc </li></ul><ul><li>diversifEye may support a mix of client and/or server applications using IPv4 and/or IPv6 on a single test interface port. </li></ul><ul><li>Support for IPv6 transition protocols: Dual-Stack Lite, 6rd / 6to4 </li></ul><ul><li>diversifEye is used in ‘Per flow’ application emulation and performance analysis of multiple environments including : xDSL, xPON, IMS, CABLE, WiMAX & LTE </li></ul><ul><li>Capture and replay TCP, UDP (files >1Gb) </li></ul><ul><li>Fully compliant TCP stack </li></ul>
  12. 12. servicEye Spider <ul><li>Remote Network Test with centralized management and control </li></ul><ul><li>Tap into the power of a sophisticated lab tester from multiple remote network sites </li></ul>
  13. 13. Thank You! Questions & Answers email :