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Multimedia over DSL

Multimedia over DSL . By Phil Moy. Agenda. DSL Forum Working Text 80 - Multiservice Architecture & Framework Requirements DSL Forum Working Text 81 - Architecture Requirements for the Support of QOS Enabled IP Services BRAS (Broadband Remote Access Server) Packet Processing

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Multimedia over DSL

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  1. Multimedia over DSL By Phil Moy

  2. Agenda • DSL Forum Working Text 80 - Multiservice Architecture & Framework Requirements • DSL Forum Working Text 81 - Architecture Requirements for the Support of QOS Enabled IP Services • BRAS (Broadband Remote Access Server) • Packet Processing • Differentiated Services • Current Industry Trends

  3. BRAS Architecture Overview ATM Central Office Wiring Center PSTN ISPs / Internet Class 5 Voice Gateway ATM or Ethernet L3 Switch /IPSS Applications(eg, VPN) BRAS Video Server Storage ATM DSLAMs Communications Portal RT DSLAMs MTU DSLAMs

  4. WT-080 Multiservice Architecture & Framework Requirements • IP QOS • Guaranteed QOS • ATM CAC (Call Admission Control) • CBR • VBR • RSVP reservation • Bandwidth On Demand, “Turbo Button” • DSL Trained to maximum, allows dynamic control of rate • Many To Many Access • Content Distribution • Caching • IP Multicasting

  5. WT-080 Multiservice Architecture & Framework Requirements (cont) • Bandwidth • ADSL - 8 Mbps up to 10,000 feet • ADSL2 - will provide 8 Mbps with a longer range • ADSL2+ - doubles the bandwidth over ADSL but with half the range • VDSL - 12.96Mbps at 1000 ft, 51.84 Mbps at 4500 ft

  6. WT-081 DSL Evolution - Architecture Requirements for the Support of QOS Enabled IP Services • Many to Many supported by TVR (Transparent Virtual Routing) • QOS - Diffserv • DSCP Marking of IP Header TOS Byte (6 bits) • AF - Assured Forwarding • EF - Expedited Forwarding • BE - Best Effort • Hierarchical Scheduling • Schedule Traffic Downstream taking into account all physical links to subscriber • Fragmentation • Fragment Low Priority Packets to minimize delay/jitter

  7. BRAS: Packet Processing Per VC decision: SAR SAR Cell, PPP frame, PPPoE frame, L2TP frame, Ethernet frame, IP datagram Header AAL2 Mask PPPoE IP Gaming IP Video Relevant Bits • Diff Serv Classification • Best Effort • Expedited Forwarding • Metering • Priority Scheduling Integrated Forwarding/ Scheduling Process . . . Ingress Cells Egress

  8. BRAS: Differentiated Services Video Server DS3 BRAS Switch Aggregation Group 1(IP) ATM WAN DSL CPE Router with NAT, or Ethernet Modem, or IAD DSL Aggregation Group 2 • New gaming service • One VC serves multiple subscribers • ATM QoS thru backbone • Policies determine which subscribers can access service • IP DiffServ CoS mapped to ATM QoS OC-3 Aggregation Group 3 Best effort to Serv Provider 1 Guaranteed to Serv Provider 1 Best effort to Serv Provider 2 Voice over IP

  9. Demo System

  10. Current Industry Trends • BRAS space is new with products developed from Alcatel, Cisco, Copper Mountain, Juniper, and Redback • RFPs for BRAS currently out from ILECs with scheduled roll out as early as 4th quarter 2003 but probably next year

  11. Acknowledgments • Copper Mountain Networks • DSL Forum

  12. Conclusion • BRAS Architecture enables Multimedia over DSL • BRAS allows multimedia over “Dumb” DSLAMs. • Congestion usually only found in the last mile can now be avoided • Turbo Button allows video on demand by dynamically boosting bandwidth up when a user purchases a movie • Diffserv allows high priority multimedia traffic to coexist with low priority web traffic. • Questions?

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