Taking a residential perspective, the primary roles of the telco access network today are to provide switched voice services and Internet access. These are achievable with traditional POTS connectivity. Demand for higher connection rates for Internet access can largely be satisfied using DSL and cable modem technologies. Challenges associated with the network of today include: Cost effectively providing broadband access to subscribers in outlying areas Delivering video services to fend off competition from MSOs Deriving revenue by providing value-added broadband services to end users Allowing subscribers the choice of service providers while maintaining a positive revenue stream for the access provider Meeting regulatory obligations and at the same time retain the incentive to invest in infrastructure
Quality of Service edge to edge across the network Multiple differentiated services sharing single network pipe Revenue expectations attached to different services Ethernet Application layer and network architecture are tightly coupled in IP video Economics in the Core for large scale IP aggregation & transport Bandwidth in the access network To deliver competitive service requires at least 20Mbps 2 HDTV @ 8-12Mbps, 2 SDTV @ 1.5-2Mbps, HSIA @ 3Mbps Operational View of the Network end to end Fault correlation of network events, flow through provisioning Network must reach into the home Necessary to manage applications in the home (STB etc) Support for new generation of consumer electronic devices
Existing DSL networks were deployed to deliver High Speed Internet access services where the initial service bandwidth was in the 1.0-1.5 Mb/s range and has recently increased to 3 Mb/s in some markets. However, consumer demand and competitive pressures are currently leading major ILECs to enhance their access networks to deliver the bandwidth required to support IP Video services. Figure 2‑2 below is representative of the bandwidth requirements for a triple play service. Many considerations must be made when forecasting downstream bandwidth requirements such as the number of SD and HD channels that will need to be supported simultaneously but it is clear that beyond arguments about future video compression performance, bandwidth requirements are increasing by an order of magnitude. It should be noted that the HD channel in 2005 and the second HD channel in 2006 are assumed to be used to support simultaneous PVR recording of HD channels and the watching of 3 SD channels in 2005 and 2 SD and 1 HD channels in 2006. If network based PVR or trickle downloading techniques were offered instead, the 2005 and 2006 bandwidth requirements on the loop could drop below 20 Mb/s.
In today’s world, fixed operators are facing unprecedented challenges to their business. Traditional sources of revenue are under attack. Voice revenues are shrinking in both business and consumer markets. Moreover, subscribers are being lured away with aggressive pricing from emerging providers. Operators are reacting with their own innovative voice bundles, often based on VoIP. Bundling is essential to retaining a high ARPU — with triple play (voice, data, and video) emerging as the winning combination. To further decrease churn, and increase revenues, operators are looking to rapidly add a video component to their service bundle. These new services are viewed as being essential to revenue maintenance and growth. Competition is fierce and the combatants are numerous and varied. Consumers face a dizzying array of choices to satisfy their communications, entertainment and information needs and their loyalty to a single company or service is weakening. But technology is changing quickly, opening up new avenues for differentiation and value. In an effort to expand sources of revenue and enhance customer bonding, traditional telecommunication service providers are leveraging new regulations and enabling technologies to compete head-to-head with cable service providers, but must be in position to bring innovative, differentiated competitive services to market quickly and at minimal cost.
Adding new triple play services to the service bundle has compelled service providers to re-think their network infrastructure to factor in stringent requirements in terms of high-availability, service flexibility and richness, scale, service reach, as well as network and service manageability. Over the last ten tears the Internet has emerged as a key infrastructure for service innovation, enabling the Internet Protocol (IP) to become the dominant wide area network communication protocol of choice. The natural result of this is that service providers and their customers are looking for ways to optimize cost by migrating existing services and applications onto IP as well. The ultimate goal of Triple Play is to move all current and future services on IP; data, voice and video. The issue is that current IP networks and communication services have been primarily designed to support traditional Internet services and applications, notably web browsing, e-mail and file transfer. These applications generally have modest transport service requirements, generally known as “best effort” service. “Best effort” service means that the network is allowed to discard or delay data packets when congestion occurs as a result of too much traffic on the network. Such loss or delay of packets will generally not be noticed by the user because the application will simply retransmit the packet or simply complete the data transfer a bit later in time. Another characteristic is that network efficiencies can be gained when aggregating traffic from multiple users because not all users are on-line and the average bandwidth demand placed on the network is much lower than the peak bandwidth. While the best effort service works very well for non-real time data transfers, problems occur with real-time applications and services as they have strict requirements on transport delay, jitter and packet loss, bandwidth availability and connection reliability. One example is voice service where packet delay or loss will impair service quality to the point that the connection may be dropped or generally becomes unusable. However, the bandwidth required for voice is relatively low and irregular, meaning that problems can be avoided by reserving some capacity of the network exclusively for voice applications and not allowing this capacity to become exhausted. Support for broadband TV and Video-on-Demand is a whole different story. The most important point is that the average bandwidth required per user for video is easily 50 times higher than what is required for Internet access, and network congestion resulting in a drop in available bandwidth or loss of traffic will in most cases instantly be noticed on the television screen. Also of importance is that during prime time, a large percentage of households are watching television. This calls for an architectural change in terms of the amount of average bandwidth per customer and – in the specific case of broadcast TV services – tools that allow bandwidth efficiency by limiting the number of copies of the same channel (the latter is achieved using a technique called “IP multicast” for traffic replication in the network). Traditional Internet service delivery networks concentrate all subscriber and service control functions in a single device called a BRAS. As this approach makes it a fairly complex and expensive device, the investment needed to increase the capacity of such infrastructure to handle the bandwidth needs of broadband video are significant. In other words, there is a service delivery infrastructure in place designed for high speed internet (web browsing, e-mail, etc.) that was not designed to support the convergence of data, voice and video services on a shared infrastructure.
This service transformation, or “video inflection point,” is driving technology shifts which demands a network transformation. The transition from ATM to Ethernet allows service providers to ride new cost curves enabled by Ethernet technology. This is an important transition that enables cost optimization, especially for bandwidth hungry applications which span millions of subscribers who average 10MBs/, 20MBs, and one day in the future, 100Mbs per household. A second important technology shift we are seeing is that strategic decisions are made to move away from session-based implementations to clientless connectivity models that are better suited to the delivery of media rich services over a broad portfolio of “plug and play” appliances in the household. Such models use proven technologies such as DHCP, and offer added flexibility in terms of allowing service providers to implement services and service policies across the service delivery architecture (for optimizing the right policies where they can scale, or are better implemented – more on this later), a key requirement for services that are dynamic and unpredictable in nature- and deployed in massive scales. A third important technology shift addresses what we refer to as “service reach” – i.e. the ability to deliver rich, always on services at very high speed in an economical way to various geographies through various access methods – copper, fiber, and perhaps in the future wirelessly. Any service provider today must deliver triple play services with at least 20MBps per user with different degrees of depth, using different xPON or xdsl technologies (NOTE: this is not just about bandwidth – but also about very rich service capabilities and policies that must be enabled : example: multicast, security, QoS etc..- we’ll cover this later in the presentation). Over the past couple of years, industry analysts have confirmed and characterized this transformation to a new type of broadband aggregation network. The table on the bottom of this slide appeared in a recent Yankee Group note titled: “IP Video Drives Rapid Evolution of Broadband Aggregation Networks” which characterizes the network transformation needed to support Triple Play. A fundamental difference in the transformed network is the appearance of distributed broadband aggregation routers taking over subscriber and service control functions traditionally located in a centralized BRAS. Essentially this means that leading industry analysts are now independently confirming the need and viability of the key concepts for transforming the network to support triple play services.
Network dimensioning & “rules of thumb” indicated in diagram – these mimic what we see in a large scale service rollout. The most apparent change brought by triple play, in particular due to the IPTV component, is the massive increase in bandwidth to be aggregated and transported in the network. Depending on several factors, including the number of subscriber TVs to be served, the volume of HD video, and the amount of VoD, it is not unreasonable to expect a 10 to 100-fold increase in the aggregation bandwidth required in the network. Unlike traditional HSI services, which could benefit from statistical gains, the deterministic nature of voice and television services results in a larger, more constant bandwidth demand on the aggregation network. Additionally, unicast demands from VoD will greatly increase the amount of bandwidth in the network.
Beyond what we’ve discussed so far, there are several key service delivery challenges to overcome in the network transformation to triple play: Providing flexibility and service versatility : The service delivery network must allow operators to incrementally and rapidly introduce new services for many years to come, both for consumer and business markets. The architecture must scale existing and new services to adapt to demands for increased bandwidth and subscriber numbers, improved QoS, and new types of networking functions, without affecting performance or service levels or requiring a network/service re-architecture. Enabling “always on” services : The service delivery network architecture must be comprised of highly-available infrastructure required for new video and audio services to assure service quality from end to end. It must provide millisecond-level service recovery or restoration mechanisms at the path, link, node and network levels, for the control, forwarding and management planes of the infrastructure. In addition, security features across the access, aggregation and edge networks (e.g. for preventing denial of service (DoS) attacks and theft of service) must be present in order to further ensure service continuity and non-stop services. Optimized cost structure : Service providers need to take advantage of the new economics enabled by Ethernet technology, and leverage purpose-built product portfolios and optimized architectures for the delivery of high-SLA voice, video, and high-speed managed data services over their service delivery network. The network must be able to gracefully scale as bandwidth demands and subscriber uptake grow over time. The success of triple play and rich media services depends upon the capability to provide services to any user at any time. This results in the diversification of broadband access technologies, including CO-based DSL (multi-ADSL, including ADSL, ADSL2plus, and VDSL2); fiber to the node (FTTN), fiber to the user (FTTU - Passive optical networking); and eventually, wireless (e.g., WiMAX). Furthermore, the network architecture must be able to accommodate substantial increases in traffic behind the access nodes (as subscriber uptake of Video on Demand takes off, for example) gracefully and cost-effectively. In addition, tools which help minimize operational expense must be available. Integrated Management: While the management challenge actually cuts across all three of the previous items, it is such a critical challenge in triple play service delivery networks that it will be discussed separately here. The evolution of broadband access network usage from simple best effort connectivity for high speed internet (HSI) to full triple play requires operators to examine the entire network architecture, and that the management of the network be integrated end to end. One of the most critical considerations is the approach to subscriber management. The shift of requirements towards QoS awareness, high reliability, high bandwidth and a mix of unicast and multicast traffic places demands on legacy subscriber management architectures that cannot be met cost effectively with HSI-optimized architectures. Traditional Internet service delivery networks concentrate all subscriber and service control functions in a BRAS. These HSI-optimized architectures were not designed to support the bandwidth capacity, Ethernet density, service richness, performance and high-availability characteristics that are an absolute requirement for always-on and always-available triple play service offerings. Nor can they handle the high rate of change associated with new, dynamic, volatile services that are highly unpredictable in nature (large subscriber base, volatile channel change, varying demographics, types of shows, live events, breaking news, etc.). As a BRAS is a fairly complex and expensive device, the investment needed to increase the capacity of such infrastructure to handle the demands of broadband video and triple play (e.g., deploying so-called distributed or next generation BRASes) can be significant.
The introduction of Triple Play services has a major impact on the network, imposing new requirements and new constraints, thereby requiring operators to upgrade their existing infrastructures. Bandwidth-intensive video services create a massive demand for increased throughput and a heightened requirement for Quality of Service (QoS), as well as service and policy scale and performance. To be strategically engaged in the Triple Play transformation process, and to benefit from its opportunities, operators must ensure that their networks can accommodate new demands for content-rich applications and bandwidth- intensive services over the next five to ten years. Operators are in agreement about the ultimate end-to-end networking model to be used for the delivery of services. Evolution to Ethernet in the access and aggregation networks has already started because of its cost-effectiveness and bandwidth efficiency. The goal of the Triple Play service infrastructure is to accommodate high-performance broadcast TV and video-on-demand services, real-time voice/multimedia, and high-bandwidth Internet access services. The fundamental challenge is that these two dimensions of scalability work against each other. In order to be scalable, it is necessary to distribute functionality in the network. However, if unnecessary functionality is too widely distributed, inefficiencies drive up costs. To achieve both scalability and cost-effectiveness, the right functionality must be optimally distributed to meet the service requirements, managing per-user QoS, security and billing scales by pushing queuing, scheduling, accounting and filtering closer to the subscriber. Bandwidth scaling, especially for the second mile, is optimized by performing multicast packet replication throughout the network (access, aggregation and edge nodes). Growth in unicast video-on-demand services is achieved by ensuring that the aggregation node capacity can be scaled to hundreds of gigabit Ethernet ports. Alcatel has capitalized on its operational experience and expertise as a service and solution integrator to develop a new type of Triple Play service infrastructure. Triple Play service delivery architectures must be based on a comprehensive, purpose-built product portfolio that helps operators to flexibly distribute the required intelligence throughout the network. The required intelligence can be activated in each part of the network (access, aggregation or edge) according to the optimal cost and function set required by any given operator.
One of the key advantages of Alcatel’s triple play service delivery architecture is its flexible distribution of the traffic management, filtering, and accounting functions. The distribution of QoS policy and enforcement allows the service provider to implement meaningful per-subscriber service level controls—by shifting the burden of supporting hundreds of thousands of logical interfaces on high-speed edge router ports, to supporting hundreds of interfaces on lower-cost Ethernet distribution ports. Sophisticated QoS feature support on the BSA allows the service provider to deliver truly differentiated IP services (with differentiation based on subscriber, as well as content), which can be scaled cost-effectively. Distributing per-subscriber QoS enforcement to the BSA simplifies the BSR-BSA QoS requirements substantially. From a QoS perspective, the BSR performs service distribution routing based on guarantees required to deliver the service and associated content, and not on individual subscribers. The BSR must simply classify content based on required forwarding class for a given BSA to ensure that each traffic type receives the appropriate treatment toward the BSA. For example, as illustrated, it is possible to have the BSR give preferential treatment to content or services from preferred ISP or application service provider (ASP) partners. In the BSR-to-BSA direction, IP services rely on IP layer classification of traffic from the network to queue traffic appropriately towards the BSA. Under extreme loading, which would be expected to occur under network fault conditions only, lower-priority data services or HSI traffic is compromised in order to protect video and voice traffic. Classification of HSI traffic based on source network address or IEEE 802.1p marking allows the QoS information to be propagated to upstream or downstream nodes by network elements, and may allow preferential treatment to be given to specific ISPs. In the BSA-to-BSR direction, traffic levels are substantially lower. Class-based queuing is used on the BSA network interface to ensure that video control traffic is propagated with minimal delay, and that preferred data and HSI services get better performance for upstream or peering service traffic than the best-effort Internet class of service. Of note is the fact that the IP edge is no longer burdened with enforcing per-subscriber policy for hundreds of thousands of users. This function is now distributed to the BSA, and the per-subscriber policies can be implemented on the interfaces facing the access node. In addition to per-service rate limiting for HSI service, each subscriber’s service traffic must be rate-limited as an aggregate, through a “bundled” service policy. This allows different subscribers to receive different service levels independently and simultaneously. It is also required that the combined bandwidth of all services be scheduled to an overall rate limit, to allow for multicast traffic to be delivered to subscribers further downstream, avoiding further complex queuing and scheduling of traffic in the access node itself.
Video and audio services are always-on services that cannot accept unpredictable network recovery timeouts and best-effort QoS implementations. Unpredictable behavior can result in a user perception of poor video quality, and eventually increase customer churn. The triple play service delivery network must therefore be capable of delivering “always ON” service. One of Alcatel’s foremost differentiators is our ability to deliver non-stop routing and non-stop services to reduce the risk of service outages due to node failure. These innovations, enable a 7450 or 7750 to recover in milliseconds from a control failure since the backup control cards are synchronized and ready to take over. In turn, this improves the economics of achieving high-availability as in many cases, it may be impractical (and technically complex) to double up BSAs. Where competitors push a BRAS, such doubling up is even far more expensive. Alcatel’s use of VPLS and MPLS in the architecture also enables rapid restoration around link failures by using fast-reroute. Alcatel’s implementation enables restoration around a link failure in less than 50ms. Highly available platforms: The Alcatel TPSDA provides a highly available infrastructure foundation. Products are designed to exceed the most stringent reliability demands of service providers, with a hardware and software architecture designed for maximum uptime. All Alcatel platforms in the triple-play service delivery architecture are fully redundant platforms with no single point of failure, implementing a real-time, modular operating system that has been proven and production-hardened in most major large-scale broadband deployments worldwide. One of Alcatel’s foremost differentiators is our ability to deliver non-stop routing and non-stop services to reduce the risk of service outages due to node failure. These innovations enable a 7450 or 7750 to recover in milliseconds from a control failure since the backup control cards are synchronized and ready to take over. TPSDA provides these service recovery or restoration mechanisms at the path, link, node and network levels, for both the control, forwarding and management planes of the infrastructure. In addition, Alcatel access nodes (BSAN) come with “5 nines” reliability, redundant controller and network interface card, and uplink redundancy layer 2 and layer 3 protocols like RSTP, 802.3ad and OSPF/RIP. Uncompromised service performance: Alcatel’s TPSDA provides uncompromised performance as the bandwidth or number of consumers is increased, and as new services are deployed on the service delivery architecture. Uncompromised service performance contributes significantly to an enhanced user experience. Secure Infrastructure: Security is a key element in ensuring service continuity or non-stop services. Security enablement across the ISAM family, BSA and BSR nodes provide the service provider with mechanisms that guarantee an assured user experience while containing denial of service (DoS) and theft of service attacks. In addition, the 5750 SSC supports subscriber self-care portals for service subscription and service selection. This a zero-touch self service process that significantly reduces customer care expenses, which also enables the user to exercise direct control over his or her service experience leading to a higher customer satisfaction.
With today’s commodity services, most users feel either under-served or over-charged. While the addition of bandwidth tiers may be an improvement for some, this still doesn’t generate a lot of extra revenues and still fails to address end-user requirements based on application usage. Using the Alcatel 5750 SSC, operators can go one step further in creating a user-centric experience in which personalized service bundles can be created, allowing users to select and adjust their individual service profile based on the specific applications they want to use.
Presentation to UCSC Engineering <ul><li>Bryan Wassom – Sr. Account Director </li></ul>
Complete portfolio for complete coverage Flexibility to Migrate over time 5526 AMS Management of all Alcatel Access elements 7330 ISAM Host 7330 ISAM 7330 SEM n GigE n GigE 1 GigE 7450 ESS 7750 BSR Ethernet switch 7300 ASAM 7300 ASAM 7300 ASAM R T1 IMA HDSL4 IMA Office Repeater Bay T1 IMA OC3c DS3 T1IMA 7329 RU 7302 ISAM UD Ubiquitous broadband service offering Ubiquitous broadband service offering ATM based DSLAMS ASAM Complete coverage for High speed internet services today IP based DSLAMS ISAM Horsepower to deliver IPTV services n GigE
Alcatel Solution - End-to-End FTTU Solution 7342 P-OLT 7342 O-Series ONTs NGN voice 7342 B-Series ONTs 7342 M-Series ONTs GigE 10 GigE Class 5 voice Single family homes Small/medium enterprises (SMEs) Multidwelling unit (MDU) with up to 12 LUs <ul><ul><li>Part of Alcatel’s complete, end-to-end solution for triple play </li></ul></ul><ul><ul><li>Full compliance with Full Service Access Network (FSAN) GPON standards </li></ul></ul><ul><ul><li>2.5 Gb/s with 1.25 Gb/s line rate </li></ul></ul><ul><ul><li>Up to 1:64 split </li></ul></ul><ul><ul><li>20 km reach </li></ul></ul>1:64 splitters 20 km 1.25 Gb/s IPTV Internet GR303 IP/MPLS VPLS 5526 AMS 7450 BSA 7750 BSR G6 VG <ul><li>28 dB link loss budget </li></ul><ul><li>GEM encapsulation </li></ul><ul><li>Over 2,300 subscribers per chassis </li></ul>1,550 nm (RF overlay) 2.5 Gb/s
Alcatel’s IP Video Network Access is one part of an Alcatel end-to-end IP video solution 1696 R-OADM 1696 R-OADM 1696 R-OADM 1696 R-OADM 1354 RM-PhM Optical Transport Internet BRAS 7450 ESS National Satellite Feed PSTN 7510 Media Gateway 5020 Softswitch Next-Generation Voice Surveillance Cameras 7330 ISAM FTTN VDSL/ ADSL2+ Modem 802.11x RG HD IP TV Wireless Laptop SD IP TV IP Touch Phone Edge VOD Server 7450 ESS 1692 MSE 1692 MSE 5526 AMS Super Head-End National Distribution Video Head Office Regional Transport Network Video Serving Offices Access Network Consumer Network GE IP Touch Phone ADSL2+ Modem 802.11x RG Satellite Combo SD IP TV PC HD Television 7340 H-ONT 7340 P-OLT Edge VoD Server 7450 ESS Edge VOD Server D-Server VSO 2 VSO 3 VSO 1 7450 ESS GE 802.11x RG SD IP TV IP Touch Phone Metro H-VPLS 7302 ISAM 7750 7750 Alcatel Video Management and Content Servers Local Network Feed MPEG Encoders Voice Application Servers MPEG Encoders National Satellite Feed 7750 D-Server 5620 SAM
Access Products – IP Convergence FTTExchange Back-bone CO X-Connect 7300 ASAM FTTRemote FTTNode FTTCurb/MDU FTTHome DLC MDU SFU ASAM-R 7340 FTTU ISAM One Platform Many Applications Unified Management CO-ISAM = 7302 UD CO Node/Curb ISAM = 7330 FTTN Fiber ISAM = 7342 FTTU 5526 AMS R 5.x +
Projected Downstream Bandwidth per Household (Typical North American IPTV Service) <ul><li>Service mix may vary (e.g., VoIP) or service subsets may be offered </li></ul><ul><li>Second HD channel initially to support concurrent home PVR recording </li></ul><ul><li>Assumes quality of picture competitive with digital satellite/ cable </li></ul>Mb/s HD=High Definition TV SD=Standard Definition TV HSI =High-Speed Internet SD 2005 2006 2007 2008 2009 5 10 15 20 25 MPEG-2 MPEG-4/VC-1 MPEG-4/VC-1 Enhancements MPEG-4/VC-1 Improvements SD SD SD SD HD HD HD HD HD HD HSI HSI HSI HSI HSI HSI SD SD HD HSI 20 – 25 Mb/s Target SD = 2.5 – 3 MB HD = 15 – 19 MB SD = 1.5 – 2 MB HD = 10 – 12 MB SD = < 1.5 MB HD = 8 – 10 MB SD = < 1.5 MB HD = < 7 MB
Technology Enablers of IPTV <ul><li>Digital Subscriber Line Technology </li></ul><ul><ul><li>ADSL2+ </li></ul></ul><ul><ul><ul><li>Speeds over 20 Mbps possible </li></ul></ul></ul><ul><ul><ul><li>Currently available </li></ul></ul></ul><ul><ul><ul><li>Residential Gateways becoming more available and decreasing in price </li></ul></ul></ul><ul><ul><li>VDSL2 </li></ul></ul><ul><ul><ul><li>Speeds up to 50 Mbps; up to 100 Mbps in Japan </li></ul></ul></ul><ul><ul><ul><li>ITU standard set 27 May 2005 </li></ul></ul></ul><ul><ul><ul><li>Available by YE 2005 (VDSL available now) </li></ul></ul></ul><ul><ul><ul><li>Alcatel VDSL available today, software upgrade to VDSL2 </li></ul></ul></ul>
. . . Driving a Service Transformation . . . Video has transformed the network requirements New services, content types, expectations (always on) Increased competition dictates service innovation/velocity On-Demand High-definition TV FROM TO Interactive Video Phone On-Demand E-Learning On-Demand HDTV
. . . That Demands a Network Transformation Triple play driven technology shifts Fiber in Access (VDSL2, PON) Optimal Cost Structure Plug and Play, Flexibility Service Reach Session-Based to Connectionless ATM to Ethernet Integrated, Flow-Through Subscriber, Network and Service Management Distributed Functions, Policies 1 2 3 Page 3 Source: Network Transformation Process for Triple Play, Yankee Group, 2005 Next-Generation Ethernet and IP-Based Broadband Aggregation IP DSLAMs: Intelligent aggregation with support for multicast; Gigabit Ethernet uplinks; increasingly RT-based Simple, flexible connections: DHCP- based; independent of device; user- based; provisioning cost low Distributed to broadband aggregation routers: Optimized for video and other QoS-sensitive services; highly scalable; 10GigE handoff to IP/MPLS core Highly available network: Little to no tolerance of service interruptions; risk of churn if reliability metrics aren’t met Early and Present Day ATM-Based Broadband Aggregation ATM DSLAMs; Unintelligent Layer 1 aggregation: low-speed ATM uplinks; mostly CO-based Complex, fixed connections: PPP-based; bound to DSL CPE in the home; provisioning cost high Centralized BRAS: Optimized for best- effort Internet access: lack of scalable routing and QoS; typical OC-12 handoff to IP core Lack of network resiliency: Outages tolerated; minimal financial repercussions
Realities and Challenges of Large Triple Play Deployments Unicast video drives bandwidth requirements: VoD, network DVR, ICC etc. 30% VoD/70% BTV up to 70% VoD/30% BTV in 2010 <ul><li>Video subscribers: </li></ul><ul><ul><li>Typically 100 </li></ul></ul><ul><ul><li>30% to 35% video subs </li></ul></ul><ul><li>HSI subscribers: </li></ul><ul><ul><li>200 to 500 </li></ul></ul><ul><ul><li>Typically 300 </li></ul></ul>5 to10 aggregation nodes per service edge router with 50,000 to 100,000 subscribers Scaling unicast video requires 200 to 400 GigE ports and/or up to 20 to 40 10GigE ports Aggregation of 100 to 200 GigE ports and/or 10 to 20 10GigE ports 30 to 50+ access nodes per aggregation node 5,000-10,000 subscribers HSI bandwidth per sub, from 2 million+ in 2005 up to 5 million and beyond in 2010 VoIP 40 kb/s with up to 4 lines per household in 2010 Average 2.5 TVs per household SDTV = 2 Mb/s min. HDTV = 8 Mb/s min. Video traffic from 12 Mb/s (2 SD + 1 HD) to 20 Mb/s (2.5 HD) in 2010 Aggregation Network Access Service Edge Long Haul Network
Challenges in Triple Play Service Delivery <ul><ul><li>Providing service flexibility/versatility </li></ul></ul><ul><ul><ul><li>Distributed quality of service </li></ul></ul></ul><ul><ul><ul><li>Distributed policies and services for optimization </li></ul></ul></ul><ul><ul><li>Enabling “Always On” services </li></ul></ul><ul><ul><ul><li>High availability infrastructure </li></ul></ul></ul><ul><ul><ul><li>Distributed security </li></ul></ul></ul><ul><ul><li>Optimizing the cost structure </li></ul></ul><ul><ul><ul><li>Scaling the bandwidth </li></ul></ul></ul><ul><ul><ul><li>Extending service reach </li></ul></ul></ul><ul><ul><ul><li>Operational efficiency </li></ul></ul></ul><ul><ul><li>Integrated management </li></ul></ul>Page 11
Building a Triple Play Service Delivery Architecture <ul><li>Requirements </li></ul><ul><ul><li>Video service drives architectural changes </li></ul></ul><ul><ul><ul><li>Capacity, subscriber density, critical nature of quality of service (QoS), multicast </li></ul></ul></ul><ul><ul><li>Getting both subscriber scale and bandwidth capacity is critical </li></ul></ul><ul><ul><ul><li>Subscriber density and port capacity do not usually scale well together </li></ul></ul></ul><ul><ul><ul><li>Service and per-subscriber policies are also required to scale </li></ul></ul></ul><ul><li>Solution </li></ul><ul><ul><li>Distribute the relevant functions to optimize the design for scalability </li></ul></ul><ul><ul><ul><li>Controlling per-user QoS scales by moving queuing, scheduling and accounting closer to the subscriber </li></ul></ul></ul><ul><ul><ul><li>Bandwidth is optimized by performing multicast packet replication throughout the network </li></ul></ul></ul><ul><ul><ul><li>Video-on-demand (VoD) scales by ensuring nodes support up to hundreds of GigE ports </li></ul></ul></ul>
Distributing QoS Policy Enforcement in TPSDA <ul><li>Per-subscriber QoS scales </li></ul><ul><ul><li>Moves it closer to the subscriber in the service aggregation </li></ul></ul><ul><li>Queuing per-service-per-subscriber is essential </li></ul><ul><ul><li>Enforce subscriber’s access rate for HSI service </li></ul></ul><ul><ul><li>Prioritize traffic types and applications </li></ul></ul><ul><ul><li>Requires robust queuing structure </li></ul></ul><ul><li>Hierarchical QoS (H-QoS) ensures customer isolation on shared “second mile” </li></ul>VoIP GigE Video HSI GigE HSI VLAN Gold Bronze ON-NET VoIP VLAN Video VLAN VLAN PER SUB BSA IP BSR BSAN Per-service priority/delay/loss Content differentiation in HSI Per-sub rate-limited HSI Per-sub QoS policy Per-service priority/delay/loss
Enabling “Always On” Services with TPSDA BSR BSA BSAN Secure, resilient VPLS infrastructure 7450 ESS 7750 SR Non-stop routing mechanisms ensure millisecond recovery times for switchover from primary to secondary route processor for non-stop service delivery Non-stop VPLS service provides millisecond service recovery for link, path, and node failures Purpose-built Alcatel portfolio exceeds stringent high-availability requirements for Triple Play services and offers optimal system characteristics with no single point of failure VRRP 5750 SSC Highly available, integrated subscriber and services control ISAM Family OMSN 1850 TSS Non-Stop Access
Mass Customization and Service Personalization Commodity Internet Service TV, VoD Gaming Real-time video/voice Legal download Parental control, firewall On-demand bandwidth Peer-to-peer control E-mail, browsing Personalized Service Bundles boost Tiered Services $ $$$