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					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
     – Differentiated Services

    Current Industry Trends




                                                        September 19, 2012 2
BRAS Architecture Overview
        Central Office Wiring Center

                                                  PSTN

                                 Class 5                              ISPs /
                                                                    Internet
                          Voice Gateway
                                        ATM or
                                       Ethernet

                                                         ATM   L3 Switch
                                                                 /IPSS

                                                                            Applications
                                   BRAS                                     (eg, VPN)
                               Video Server
                                                                           Storage
      ATM DSLAMs


                                                                           Communications
RT DSLAMs                                                                     Portal



      MTU DSLAMs
                                                                   September 19, 2012 3
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
                                                               September 19, 2012 4
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


    Service           TV                  PC
    Broadcast TV      3 to 6 Mbps         300 to 750 kbps
    VOD               2 to 6 Mbps         300 to 750 kbps
    HDTV              12 to 19 Mbps


                                                                    September 19, 2012 5
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



                                                                      September 19, 2012 6
BRAS: Packet Processing
Ingress   Cells                                                        ...

          Per VC decision:
                                                           SAR
          Cell, PPP frame, PPPoE
          frame, L2TP frame, Ethernet         Header
          frame, IP datagram
                                                                       AAL2
          Mask                                                          PPPoE
                                                                          IP Gaming
          Relevant Bits                                                     IP Video



                                           Diff Serv Classification
                                              Best Effort
          Integrated Forwarding/              Expedited Forwarding
          Scheduling Process               Metering
                                           Priority Scheduling

 Egress
                                                                       September 19, 2012 7
 BRAS: Differentiated Services
                          DS3                  BRAS                 Switch

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

          Guaranteed to Serv Provider 1

          Best effort to Serv Provider 2

          Voice over IP

                                                                                   September 19, 2012 8
Demo System
                      PPPoA
          Web Browser #1
                               Alcatel
                                                                                                                Smartbits        Video Server
                              ADSL CPE


                                                                            VantEdge
  Video on                                                            DS3
  Demand                                                                     VE3000
                                                                      ATM
 Display #1                               Alcatel ASAM                                              OC-3c
                            Set Top Box       1000                                                   ATM                                        ISP 1
                                                                      UBR VC


                                                                      UBR VC
                                                                                     LAC
                                                         PPPoA                                                PVC
  Video on                  Set Top Box                                               #1
  Demand                                                                                                      L2TP
                                                           IP                                               Tunnel #1
 Display #2                                                            nrtVBR VC
                                                                                     TVR                       PVC
                                                           IP                        Group                                   ATM
                               Alcatel                                                                        L2TP
                    PPPoA     ADSL CPE                   PPPoA
                                                                       nrtVBR VC
                                                                                                            Tunnel #2       Network
                                                                       UBR VC

                                                                                                               PVC
         Web Browser #2                                                              LAC
                                                                                      #2
                                                             UBR VC

                    PPPoA                 CopperEdge     PPPoA           UBR VC
                               Alcatel      CE200                                  ATM Cell Relay

                              ADSL CPE                   PPPoE
                                                                                                                                                ISP2
         Web Browser #3                                                OC-3c
                      PPPoE                                             ATM
                               Celsian
                               G.Shdsl                                      Ethernet
                                CPE

         Web Browser #4
                                                                                NMS




                                                                                                                                       September 19, 2012 9
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




                                                          September 19, 2012 10
Acknowledgments

   Copper Mountain Networks
   DSL Forum




                               September 19, 2012 11
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?




                                                                         September 19, 2012 12

				
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