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    IPTV Testing - Ensuring Quality of Experience through Intelligent ... IPTV Testing - Ensuring Quality of Experience through Intelligent ... Document Transcript

    • How is IPTV Delivered? Delivery of video to the consumer has Data undergone rapid change in recent UDP/RTP Data years and is guaranteed to continue to UDP/RTP UDP/RTP do so in the foreseeable future. Voice Metro Metro Video UDP/RTP Voice Core Cable TV networks deliver a large range of content, and the ability Video (Broadband TV, UDP/RTP Video-on-Demand Media Stream to provide user interactive features Video-on-Demand) including VoD. The differences are responsible for the complexity Carrying the most promise for the future is of the delivery network. Broadcast TV over delivery of video over multi-service IP networks. IP is primarily a one-way channel, using well This is commonly referred to as IPTV. It is understood multicast protocols. The home delivered as a Triple-Play service to consumers network is responsibe for multicast messages and that includes high speed Internet (HSI) and Voice image display. over IP (VoIP). VoD adds another level of complexity. Requests Video over IP Information Flow for and control of video content are transmitted upstream from the subscriber to the service The major components and data flow in IPTV provider using the Real-Time Streaming Protocol networks consists of media and control flowing (RTSP). Video content is returned to the subscriber between content servers and home networks. via the Real-time Transport Protocol (RTP). The two types of video services delivered are linear broadcast and VoD. Both have IPTV Delivery Challenges dramatically different characteristics that affect Until differentiating services are developed for the networks that handle them. Broadcasts are IP-based video-voice-data networks, IPTV services regularly scheduled programs sent to large will continue to be compared with traditional numbers of subscribers. It is sent efficiently over TV, cable and satellite service. As such, the IP multicast IP routes. delivery network must remain transparent to customers. Customers expect video quality and VoD service delivery exhibits an entirely different service availability to be on par or better to make behavior. Stored videos are sent to the subscriber the switch. With multiple choices available to consumers, there is little tolerance for poor quality and operational problems. A poorly engineered network can lead to substantial customer churn. To successfully deploy IPTV, the following end-user requirements must be addressed: • Video quality – subscribers’ perception of quality must be the same or better than other alternatives • Minimal channel change delay – since on demand. Each subscriber receives their own instant response is expected video flow, which they can control with VCR-like • Assured service delivery and availability controls. for an always-on service.
    • IPTV Testing Requirements Video and voice quality perception is highly sensitive to loss, jitter and delay. These and other Service providers must systematically test and network impairments appear on a TV as choppy verify network devices in each of the video or blocky video, frozen frames and garbled transport architectures, including video content voices as shown on the cover. servers, core and edge routers, access devices, and customer premises equipment. Such testing Quality of service for IPTV delivery networks must provides an understanding of individual device be optimized to minimize jitter and packet loss performance and may determine how much for video over IP streams. impact each has on the overall system. Service Provider Bandwidth management is closely related to the video compression algorithm in use. The standard Video Servers with movies Video Transport video CODEC is MPEG-2, which is showing its for Video-on-Demand; sent with multicast Distribution us IP/UDP/(RTP age; an MPEG-2 stream for an HDTV channel requires more than 15 Mbps of bandwidth. .mpg VOD lib Content Distribution New video encoders are ready to facilitate IPTV Server Farm deployments, including MPEG-4, which halves Broadcast the data rates required to match MPEG-2 quality. Feed Digital Head End – Live Program Channel change performance (CCP) relates to Ads Feed Server Farm how effectively channel change requests are handled. A number of factors affect CCP: • Network multicast – IGMP messages GE/10 GE Broadcast Programs OC12-48ATM x N must make their way upstream from the and Advertisement; Back Office live or pre-recorded; Servers and customer, through multiple levels of routers sent with multicast Service • The set-top box improves the subscriber’s perception by buffering media packets • The frequency of I-frames sent by the content server. I-frames define an entire picture frame and dictate when the new channel can first be displayed. Content Multicas Servers Transport Ne Join Multicast Channel 1 Latency Leave Latency Overlap Channel Change Multicast Channel 3 Latency System-level tests that incorporate more than one Join Leave Channel1 Channel Switch Delay demarcation point in the transport architecture Join Channel 3 are required. In this way, a clear understanding of how well the individual systems play with each Device interoperation must be carefully other is determined. engineered for tight signal integrity. Multi-service networks are busy delivering Voice over IP Finally, the network must be tested end-to- (VoIP) along with mundane Web traffic. In such end. Most standard routing and forwarding networks, strict QoS mechanisms must exist to performance tests should be performed, looking deliver differentiated classes of service. at packet loss or latency under different load conditions. The modern IPTV delivery system is a complex
    • beast. The sub-systems that we’ll look at are: SVHE-specific testing requirements include: • Super Video Head-End • Characterizing the encoders and IP • Video Transport Network converters to ensure video stream quality • Access / Broadband Network • Measurement of the performance of • Infrastructure Components aggregation switches within the SVHE and at the edge of the metro network Common testing requirements for all subsystems and especially the SVHE include: The Video Transport Network includes national • Jitter, latency and loss distribution as video and regional networks that serve to connect the traffic increases. SVHE to the Access Networks. Subscriber Media Flow Testing requirements include: rt and Access Network Customer Premises with • Measurement of raw throughput in the using TP) with access equipment Residential Gateways/ Set Top Box/VoIP Phone/PC delivery of VoD UDP traffic • Measurement of multicast capacity for broadcast TV Local Ring & Servers • Determining QoS enforcement effectiveness QAM/ in forwarding broadcast TV, VoD, VoIP and GE QAM HFC data traffic GW • Measurement of switch-over and routing Access Network convergence time under network failure Cable Co/HFC Home Local Ring The Access/Broadband Network consists of & Servers geographically distributed multi-purpose devices. Etn/ The specific device is directly related to the type GE Switch PON of last-mile network used and include MSANs, DSLAMs, B-RASs, and PON/OLTs. Access Network Telco/ETTH Home Testing requirements include: Local Ring • Ensuring support for maximum subscribers & Servers • Measure VoD performance at various load xDSL levels RT/DSLAM/ • Measure channel change performance OLT/DLC/UBLC • Measure the performance of AAA servers ast Access Network Network Telco/ADSL Home in response to user sign-on requests. • Gauge QoS assurance for triple-play traffic • Determine admission control mechanisms • Quality of Experience (QoE) is measured effectiveness both at the network level and at the • Analyze the subjective quality of video perceptual video level. Infrastructure Components should not be The Super Video Head-End (SVHE) system’s overlooked. Special TV events and network re- takes the video content from multiple sources starts can result in huge numbers of subscribers and processes it for delivery to the IP network. It activities. Each event must be quickly recorded consists of components that convert digital video and serviced. and analog content into IP packets, components that encode the video into MPEG and other Infrastructure components include: encoding formats, VoD servers that hold and • DHCP and AAA services deliver content and middleware components that • DNS servers for name resolution service set-top box requests and billing. • CPE management systems
    • How Can Ixia Help? industry’s leading protocol coverage – all necessary to reveal accurate performance Ixia’s IxLoad is a highly scalable, integrated test benchmarks. Stateful traffic is essential to solution that assesses the performance of triple- validate the performance of next generation play networks and devices. IxLoad emulates Deep Packet Inspection (DPI) devices. DPI IPTV and triple-play subscribers and associated devices are required to optimize QoS at protocols to ensure subscriber Quality of the granular level as QoE intensive video Experience. applications network push bandwidth limits. IxLoad supports the full range of protocols used Ixia’s legendary ease of use continues with in IPTV and triple-play testing: features like One-Touch Automation, extensive • Video – MPEG, IGMP, RTSP analysis tools, and statistical viewers. All • Voice – SIP, MGCP this means test engineers can ramp up with • Data – HTTP, FTP, SMTP and others. IxLoad has a number of powerful features designed specifically for video testing: • Video subscriber emulation • Video server emulation • Quality of Experience (QoE) measurement • Single and Multi-Program Transport Streams • Substantial CODEC support • Extensive statistics • Real-time Video Capture and Playback • Full packet capture and analysis Ixia’s customers enjoy the simplicity of a single platform to emulate true subscriber group modeling with concurrent IPTV, VoIP and high speed Internet traffic. All your Layer 4-7 testing needs are satisfied in a single box – a feature not offered by any other test equipment vendor. All other Ixia less training, less time is required to develop applications run on the very same platform, automation scripts, and more productivity. maximizing your investment. Ixia’s platform and interfaces offer the highest IxLoad is the complete solution for IPTV line-rate stateful traffic at 10G, the highest network testing, addressing all aspects of video number of concurrent connections, and the delivery, along with the voice, user data and
    • Who is Ixia? Vendors, Service Providers, Governments, and Enterprises use Ixia’s test systems to validate the functionality and reliability of complex IP networks, devices, and applications. Ixia’s powerful and flexible Ixia is a leading provider of performance test systems for IP-based test hardware and applications provide highly accurate emulations infrastructure and services. Ixia is a public company (NASDAQ: of network and application traffic that test IP network devices and XXIA) operating in over 30 countries worldwide. Communications systems to their fullest. Ixia’s test systems utilize a wide range of and entertainment delivery is rapidly moving to an IP infrastructure. industry-standard interfaces, including Ethernet, SONET, and ATM. To achieve “utility grade” quality, this infrastructure must be thoroughly tested. It is Ixia’s vision to accelerate the migration of Ixia distinguishes itself from its competition by remaining 100% communications and entertainment to IP by providing the best focused on developing IP Performance Test Systems, by continuous performance Test Systems in the industry. Network Equipment innovation, and by dedication to customer satisfaction. Ixia’s product line includes: Ixia Worldwide Headquarters 26601 Agoura Rd. Hardware Calabasas, CA 91302 Optixia Chassis – a family of ultra-high density, flexible testing platform used to hold (Toll Free North America) Ixia Load Modules. All chassis contain a high-performance Windows computer system. All Ixia 1.877.367.4942 chassis, old and new, are compatible and may be daisy-chained together in a large scale test. (Outside North America) +1.818.871.1800 Optixia Load Modules – a wide array of interface modules available for use in Optixia (Fax) 818.871.1805 chassis. Load Modules are available for 10/100/1G/10G Ethernet, SONET/POS, ATM, and www.ixiacom.com PoE. Other Ixia Contacts Software Info: info@ixiacom.com IxNetwork – tests complex routing topologies by emulating a wide range of routing Investors: ir@ixiacom.com protocols, along with authentication and broadband encapsulations. Powerful traffic Public Relations: pr@ixiacom.com generation tools for any type of Layer 2/3 testing. Renewals: renewals@ixiacom.com Sales: sales@ixiacom.com IxLoad – tests Layer 4-7 Triple-Play networks and devices through emulation of Internet Support: support@ixiacom.com protocols. Data protocols include HTTP, FTP, SMTP, DHCP, DNS, and AAA services; voice Training: training@ixiacom.com protocols include SIP and MGCP; video protocols include IGMP, MLD, RTSP and MPEG. Ixia USA Sales IxExplorer – provides access to all Ixia hardware functionality. Direct control over Ixia’s Phone: 1.866.355.4942 Email: sales@ixiacom.com powerful stream engines is available to generate and capture any data. Ixia Federal Sales IxAutomate – an automation engine for Ixia tests that includes a wide range of pre-built Phone: 1.703.822.7527 Email: salesfederal@ixiacom.com tests for Layer 2 through 7 testing, including many industry-standard RFC tests. IxAutomate is the perfect tool for regression suite development. Ixia Canada Sales Phone: 1.877.367.4942 Email: salescanada@ixiacom.com Test Conductor - a comprehensive regression harness compatible with key Ixia test tools. Ixia China Sales IxANVL - the industry standard for automated network protocol validation. Test suites are Phone: +86.10.84549199 Email: saleschina@ixiacom.com available for most popular Internet protocols. Ixia Europe, Middle East & Africa Sales IxChariot - simulates real-world applications to predict device and system performance Phone: +44.1628.405750 Email: salesemea@ixiacom.com under realistic load conditions. IxChariot offers thorough network performance assessment and device testing by simulating hundreds of protocols across thousands of network Ixia India Sales endpoints. Phone: +91.80.25633570 Email: salesindia@ixiacom.com IxVPN - an extremely scalable performance analysis solution for validating the performance Ixia Japan Sales of IPSec VPN gateways. IxVPN utilizes Ixia’s purpose-build Load Modules including the Phone: +81.3.5365.4690 Email: salesjapan@ixiacom.com Encryption Load Module (ELM) with dedicated security processors. Ixia Oceana Sales IxVoice - a comprehensive hardware and software test framework that provides unified Phone: 1.818.292.1561Email: salesoceania@ixiacom.com VoIP and PSTN test solutions. With its cost-effective and scalable test libraries it addresses all major VoIP protocols: SIP, SCCP (Skinny), H.323, MGCP, H.248 (MEGACO) as well as TDM Ixia South Korea and analog telephony services. Phone: +82.11.897.1326 Email: salessouthkorea@ixiacom.com 915-1729-01 Rev A September 2007