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Telepresence success is based on an almost flawless presentation of HD video and Audio. Clearly the video and audio quality are clearly the most relevant metrics. But in relation to understanding the full picture of quality of experience more test parameters need to be included in the test strategy. Evidently Telepresence is not the only service to run on a network, therefore its important to test with varying applications and load conditions.
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Shenick Network Systems 1
www.shenick.com
Mark Lambe Product Marketing Manager
Shenick Network Systems
Use of Traffic Emulation in Telepresence Interoperability Testing
Shenick Network Systems 2 www.shenick.com
Overview
Telepresence is the delivery of high performance voice and video which plays a critical role in service differentiation.
A clear understanding of quality and performance limitations under a variety of operational conditions, including interoperability, is imperative to success.
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.
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Define Interoperability
Interoperability means different things to different people at each stage The Telepresence deployment will function correctly i.e. each component
in the system can communicate and operate with each other. The Telepresence deployment operates correctly on the proposed
infrastructure with minimum disruption. The Telepresence deployment will operate alongside other services
(video, voice, data) without impacting QoE/QoS. The use of different Vendor end-point systems/components.
Telepresence has unified the way we communicate Therefore a unified test solution covering all aspects of Interoperability is
required.
VendorInteroperability
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System Functionality
Emulate the most realistic components, therefore giving the most accurate results A Complete test process - examine performance from end-point boot-up to
call ended
Performance test configuration/management server responses Ability of end-points to connect to management servers Time to download end-point firmware settings, upgrades, etc Time to register through to time to join calls
Participate in real/live Telepresence calls Measure actual video/audio quality
Security Testing Attempt registration with un-assigned MAC addresses
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Operational Functionality
Preliminary testing Network Performance
Connectability – End-points can communicate with management servers – What impact will firewalls have on Telepresence traffic flows coming from unsecure to secure
networks Test Telepresence management servers under varying network and load conditions
– If a DDoS attack occurs at the firewall, what impact has this on the Telepresence conference
Hardware Performance Determine latency measurements CPU Processing performance limitations
Quality Test end-to-end video/audio quality using perceptive analysis tools Test bandwidth performance use various video grades (low, medium, high
resolutions)
Classification Testing QoS Testing
Are Telepresence flows identified and handled correctly False negative tests – test with flows of similar nature ( e.g. P2P) False positive tests – a Telepresence flow is identified and handled incorrectly
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Meeting Functionality
Flow Control Testing Video Switching – test video switching policies
who has the floor testing Who is shouting the loudest to win control of the screen Sporadic Interruption through dynamic behaviour or un-muting of a
participant Audio – test the capability to deliver every end-points audio flows
a heated discussion
Security feature Testing Assess muted room appearance functionality Attempt to join conference with unknown/un-invited numbers
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Emulated Telepresence Activity
Per Flow Emulation & Performance Analysis
Emulate real stateful end-points, with real user activity
Register with Telepresence Management Servers
Participate in real calls
Accurate representations of real world devices
Per end-point unique MAC address assignment
Static and Dynamic IP address allocation IPv4 and IPv6 capabilities
diversifEye’s flexibility enables users configure device properties easily, matching those in the Telepresence device management database
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Real User Activity
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
Unique video and audio per emulated Telepresence end-point Ability to vary codecs for video and audio Auxiliary inputs e.g. Videos, Presentations Dynamic behaviour to emulated end-points
Loudness (peak level, duration, etc) Mute / Un-mute calls in live tests
Shenick’s diversifEye enables users set various levels of loudness per emulated Telepresence end-points
Mute / Un-mute calls during live tests
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Sample Performance Analysis
Measure performance on each and every individual emulated Telepresence end-point In multi-point calls determine how varying network architectures/settings impact
call performance
Sample Performance Metrics per unique Telepresence end-point Video Quality – Use perceptive analysis tools to deliver MOS scores Audio Quality – Use perceptive analysis tools to deliver MOS scores RTP Bandwidth – bits or packets per second SSRC rate – Sent / received RTP packet metrics – Dropped/Duplicate RTP Video frame count / Video frame jitter Out Calls Attempted / Established / Rejected
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
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Open Test Strategy
Telepresence will run in parallel to other services such as voice, video and data. It’s essential to determine the impact Telepresence deployments have on existing
services It’s also important to understand how Telepresence is impacted by adding other
traffic sources and varying these flows loads. Test with both legitimate and illegal traffic flows, spam, virus, worms, DDOS, etc
In the following open test scenario What’s a relevant / realistic MOS score for Telepresence in live networks? Who would you perceive as the happiest customer?
Telepresence MOS (video / audio)
HTTP Downloads(seconds)
P2P traffic flows (present)
VoIP MoSEmail send time
(ms)
Enterprise A 4.5 / 4.5 25 3 950
Enterprise B 3.9 / 4.0 1 4.6 5,000
Enterprise C 4.2 / 4.4 10 4.5 2,000
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diversifEye
diversifEye emulates stateful clients with real world functionality and features for Telepresence
diversifEye provides stateful traffic emulation of many common applications and traffic flow types:
IGMP / MLD, VoD (RTSP), VoIP, Dual Hosted VoIP, RTP, PPPoE, HTTP, P2P, VLAN, DHCP, P2P TCP Playback, SMTP, POP3, FTP, TWAMP, SSL/TLS
Mix legal and illegal flows: include DDoS type attacks, emails with vrius, spam attacks, etc
diversifEye may support a mix of client and/or server applications using IPv4 and/or IPv6 on a single test interface port.
Support for IPv6 transition protocols: Dual-Stack Lite, 6rd / 6to4
diversifEye is used in ‘Per flow’ application emulation and performance analysis of multiple environments including : xDSL, xPON, IMS, CABLE, WiMAX & LTE
Capture and replay TCP, UDP (files >1Gb)
Fully compliant TCP stack
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