How To Implement IPTV Networks


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  • For details, refer to:,2340,en_2649_34223_37529673_1_1_1_1,00.html
  • VLAN Merge refers to the ability of the access device to merge traffic from both the multicast VLAN and a unicast VLAN and deliver it over a common subscriber connection (e.g. a PVC or a VLAN) to the subscriber. VLAN Merge is also referred to more commonly as “MVR” (Multicast VLAN Registration)
  • How To Implement IPTV Networks

    1. 2. IPTV-01: How To Implement IPTV Networks Franchesca Walker Director, Enterprise Solutions Foundry Networks, Inc
    2. 3. Table of Contents <ul><li>IPTV, Multi-Play Service Bundle: Why, What? </li></ul><ul><li>Components of an IPTV Network </li></ul><ul><li>IPTV Network Demands </li></ul><ul><li>Designing An IPTV Capable Network </li></ul><ul><li>Closing Thoughts </li></ul>
    3. 4. © 2006 Foundry Networks, Inc. I P T V , M u l t i -P l a y S e r v i c e B u n d l e : W h y , W h a t ?
    4. 5. Challenges Facing Telcos Today <ul><li>Increasing competition from cable operators </li></ul><ul><li>Voice is close to free </li></ul><ul><li>Need to reduce customer churn </li></ul><ul><li>Develop ways to grab a greater share of the customer wallet </li></ul><ul><li>Cautious capital outlays after the bursting of the bubble </li></ul>9/16/08 One-Bill Summary Customer John Doe A/c # (123)-456-7890 Plans and Services $9.96 Broadband Internet $19.99 Phone Services $15.99 Network Television $40.97 Taxes and Surcharges $12.86 Total Current Charges $99.77
    5. 6. IPTV: A Silver Bullet For Telcos? <ul><li>The good news of high broadband adoption </li></ul><ul><ul><li>>181 million broadband subscribers in OECD countries * </li></ul></ul><ul><li>Value-added services possible through IPTV </li></ul><ul><ul><li>Single bill for consumers </li></ul></ul><ul><li>Extensive data on user viewing habits </li></ul><ul><ul><li>Targeted ad insertion increases appeal to advertisers </li></ul></ul><ul><li>More for less </li></ul><ul><ul><li>Better utilization of installed infrastructure conserves cap-ex and op-ex </li></ul></ul><ul><li>Telco operators have been busy pursuing a FTTx strategy to facilitate higher speeds to the consumer </li></ul>* Source: OECD Broadband Statistics
    6. 7. © 2006 Foundry Networks, Inc. Components of an IPTV Network
    7. 8. Reference Architecture for IPTV Access node (PON OLT, DSLAM) SHE for national content insertion National Network for Content Distribution RHE Legend RHE: Regional Head End SHE: Super Head End RHE Media Server Farm POP Access Ring POP Middleware client-server interaction Interaction with network (E.g. Multicast Join/Leave) Aggregation Ring Access Ring Aggregation Ring BNG BNG
    8. 9. Major Players In The IPTV Market Today Component Vendors Residential Gateway 2Wire, Linksys (Cisco), NetGear, Westell, Amino etc Set-top box Amino, 2Wire, Scientific Atlanta (Cisco), Motorola Broadband Access Node Alcatel-Lucent, Huawei, ECI Telecom, Zhone, Calix, Occam Networks, AFC/Tellabs, Motorola, Siemens, Ericsson … Aggregation Node Foundry, Cisco, Alcatel-Lucent, Juniper, Redback Broadband Network Gateway Cisco, Alcatel-Lucent, Juniper, Redback (Ericsson) Head-end servers Kasenna, Bitband, Broadbus, Arroyo Head-end acquisition systems Harmonic Head-end encoders Optibase, Tut Systems, Skystream, Scientific Atlanta (Cisco) Middleware Microsoft, Myrio (Siemens), Minerva Software, Orca Interactive, Thales, Bitband, proprietary software in large service providers who had an early start DRM Software Irdeto Access, Nagra, Verimatrix, proprietary software. Microsoft MS-TV2 middleware has DRM capabilities embedded in it. Policy Management Software Major players: Tazz Networks, Bridgewater Systems
    9. 10. © 2006 Foundry Networks, Inc. IPTV Network Demands
    10. 11. IPTV Network Demands (1 of 3) <ul><li>Need for high bandwidth </li></ul><ul><ul><li>Standard Definition (SDTV) video: </li></ul></ul><ul><ul><ul><li>Requires about 4 Mbps per stream (MPEG-2) </li></ul></ul></ul><ul><ul><li>High Definition (HDTV) video: </li></ul></ul><ul><ul><ul><li>Requires 14-18 Mbps per stream (MPEG-2) </li></ul></ul></ul><ul><li>Importance of latency </li></ul><ul><ul><li>High latency negatively affects user experience directly: </li></ul></ul><ul><ul><ul><li>IPTV involves procedures such as DRM authorization, channel zapping, </li></ul></ul></ul><ul><ul><ul><li>Interactive applications such as VoD, content search under interactive TV / network PVR etc. </li></ul></ul></ul><ul><ul><li>IGMP Join Latency </li></ul></ul>
    11. 12. IPTV Network Demands (2 of 3) <ul><li>Quality of Service </li></ul><ul><ul><li>IPTV co-exists with other services such as high-speed Internet access, VoIP and interactive gaming </li></ul></ul><ul><li>Optimization of channel change time in some middleware by sending a burst of unicast traffic before streaming multicast traffic </li></ul><ul><li>Wire-speed performance without packet loss an absolute requirement </li></ul><ul><li>Resiliency </li></ul><ul><ul><li>Subscriber’s expectations of high availability are table stakes </li></ul></ul><ul><li>High Density </li></ul><ul><ul><li>Trend in access networks: compact platforms close to the subscriber </li></ul></ul>
    12. 13. IPTV Network Demands (3 of 3) <ul><li>Future-proof Infrastructure </li></ul><ul><ul><li>IPTV is expected to accelerate the shift to IPv6 </li></ul></ul><ul><li>Flexibility in Service Delivery Models </li></ul><ul><ul><li>Centralized transport through a BRAS </li></ul></ul><ul><li>Network Infrastructure Security </li></ul><ul><ul><li>Detect and prevent malicious attempts to take over the network </li></ul></ul>
    13. 14. Sequence Of Actions During A Channel Zap Operation <ul><li>Channel zap/channel surfing has an important bearing on user experience when watching IPTV </li></ul>Access + Aggregation Network Multicast stream User changes channel to watch the new channel 1 2 3 IGMP Leave of old channel Digital Rights Management Checks for new channel 4 6a IGMP Join of new channel 5a IGMP Leave Latency Stop multicast of old channel IGMP Join Latency Issue IGMP Join / PIM Join through Network if needed 6b New Multicast stream 7 8 New channel delivered to user TV Set-top box processing delays (e.g. jitter buffer delay, MPEG decoder delay etc) 5b DRM response RHE Media Server Farm
    14. 15. Problem Statement for IPTV Networks <ul><li>How do we economically scale and future-proof aggregation networks to ensure high performance guarantees? </li></ul><ul><ul><li>Many aggregation networks built to date have focused on best-effort service delivery </li></ul></ul><ul><li>What happens if the above is not met? </li></ul><ul><ul><li>Packet loss due to poor router/switch performance has visibly negative effects </li></ul></ul>Example of a pixelized image (Source: Packet Loss Recovery for Streaming Video, http:// )
    15. 16. Designing An IPTV Capable Network
    16. 17. Major Design Considerations: Access Network (1) <ul><li>Access considerations: </li></ul><ul><ul><li>Access technology </li></ul></ul><ul><ul><li>Bandwidth available per home </li></ul></ul><ul><ul><li>Number of TV channels </li></ul></ul><ul><ul><li># of concurrent channels per subscriber </li></ul></ul><ul><ul><li>Bandwidth per service type per subscriber </li></ul></ul><ul><li>Delivery mechanism to the subscriber. Popular choices: </li></ul><ul><ul><li>N PVC:1 VLAN model with different services over a single VLAN </li></ul></ul><ul><ul><li>N PVC:1 VLAN model with unique VLAN per service </li></ul></ul><ul><ul><li>1 PVC:1 VLAN model: Each service of each subscriber mapped to a unique VLAN </li></ul></ul><ul><li>All of the above models assume 1 ATM PVC to the subscriber. </li></ul>
    17. 18. Major Design Considerations: Access Network (2) <ul><li>Subscriber management and encapsulation. 2 most common choices: </li></ul><ul><ul><li>DHCP </li></ul></ul><ul><ul><li>PPPoE for data with IPTV traffic delivered over a separate VLAN. </li></ul></ul><ul><ul><li>Increasing number of IPTV deployments are moving away from PPPoE to DHCP for data service also </li></ul></ul><ul><li>For operators currently using PPPoE, a recommended approach: </li></ul><ul><ul><li>Use of PPPoE for data service only </li></ul></ul><ul><ul><li>Use DHCP for video and voice traffic </li></ul></ul>
    18. 19. Ma jor Design Considerations: Aggregation Network (1) <ul><li>Aggregation choices: </li></ul><ul><ul><li>Access-Aggregation Network interface </li></ul></ul><ul><ul><li>Layer 2 or Layer 3 network? </li></ul></ul><ul><ul><li>Layout of the network </li></ul></ul><ul><ul><li>Location of video content </li></ul></ul><ul><li>Bandwidth needs: </li></ul><ul><ul><li>Number of broadcast/premium TV channels to be offered over the network </li></ul></ul><ul><ul><li>Amount of unicast-based services expected in the network </li></ul></ul><ul><ul><li>Using oversubscribed equipment not a good idea </li></ul></ul>
    19. 20. Major Design Considerations: Aggregation Network (2) <ul><li>Expected viewer habits: </li></ul><ul><ul><li>Are some channels heavily watched? If yes, always have these channels delivered to the access node </li></ul></ul><ul><ul><li>Premium channels requested on demand </li></ul></ul><ul><li>Desired resiliency: </li></ul><ul><ul><li>Fast SONET-like (sub-50 millisecond) resiliency? </li></ul></ul><ul><ul><li>Are redundant links to access node desired? </li></ul></ul><ul><ul><li>Multicast redundancy </li></ul></ul><ul><li>Security: </li></ul><ul><ul><li>Prevent subscribers from “sourcing” multicast traffic </li></ul></ul><ul><ul><li>Encryption of transported video traffic </li></ul></ul><ul><ul><li>Ensure that Denial of Service (DoS) guards are in place in aggregation network </li></ul></ul>
    20. 21. Design 1: IPTV Network Design Layer 2 Aggregation Network With Ring Topology Aggregation network Subscribers BNG Access device (e.g. DSLAM, PON OLT etc) Broadband Network Gateway BNG
    21. 22. Design 2: IPTV Network Design Layer 3 Aggregation Network Aggregation network Video source RP1 RP2 Subscribers Subscribers R1 R2 R3 R4 Note: Topology of the aggregation network may be any generic mesh Switch1 Switch2 Switch4 Switch3
    22. 23. Design 3: IPTV Network Design Multicast Overlay On Top of MPLS Network Aggregation network Video source RP1 RP2 Subscribers Subscribers R1 R2 R3 R4 Note: Topology of the aggregation network may be any generic mesh Switch1 2 4 3
    23. 24. Design 4: IPTV Network Design Multicast Distribution Using VPLS VPLS In The Aggregation network Video source R2 R3 Subscribers Subscribers R1 R6 R5 R4 Note: Topology of the aggregation network may be any generic mesh End-points of the VPLS All routers R1 .. R6 are part of a common VPLS instance
    24. 25. PIM-SSM and IGMPv3: Why Source Specific Multicast? <ul><li>Challenges with Any Source Multicast (ASM): </li></ul><ul><ul><li>Poor access control in “traditional” Any Source Multicast (ASM) model </li></ul></ul><ul><ul><li>Inefficient handling of well-known sources </li></ul></ul><ul><ul><li>Limited multicast address space and address allocation </li></ul></ul>
    25. 26. How to Implement IPTV Networks <ul><li>Closing Thoughts </li></ul>
    26. 27. Explosive Subscriber Growth in IPTV <ul><li>Explosive world-wide subscriber growth in this segment in the coming years </li></ul><ul><li>2008 is the year the hockey stick effect takes shape! </li></ul>Source: Infonetics Research, “ IPTV Equipment, Services and Subscribers Market Share and Forecast”, October 2006
    27. 28. Tremendous Growth Potential World-wide! <ul><li>Demand for world-wide edge routing and switching equipment for IPTV expected to grow 34% this year and 20+% over the next 2 years </li></ul>Source: Infonetics Research, “ IPTV Equipment, Services and Subscribers Market Share and Forecast”, October 2006
    28. 29. What to look for in an IPTV Solution <ul><li>Guaranteed wire-speed performance independent of packet size </li></ul><ul><li>Advanced QoS architecture required for multi-play services </li></ul><ul><li>Low latency architecture assures better user experience </li></ul><ul><li>High Availability Architecture that minimizes service downtime </li></ul><ul><li>High Density solutions available in a variety of cost optimal configurations </li></ul><ul><li>Future-proof infrastructure with readiness for 100-GbE </li></ul><ul><ul><li>The only IPTV aggregation platform with true 100-GbE readiness today </li></ul></ul><ul><li>High infrastructure security </li></ul>
    29. 30. How to Implement IPTV Networks <ul><li>Thank you </li></ul>