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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

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Presentation Transcript

Agenda
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


Bras architecture overview
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


Wt 080 multiservice architecture framework requirements
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


Wt 080 multiservice architecture framework requirements cont
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


Wt 081 dsl evolution architecture requirements for the support of qos enabled ip services
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


Bras packet processing
BRAS: Packet Processing Support of QOS Enabled IP Services

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


Bras differentiated services
BRAS: Differentiated Services Support of QOS Enabled IP 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


Demo system
Demo System Support of QOS Enabled IP Services


Current industry trends
Current Industry Trends Support of QOS Enabled IP Services

  • 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


Acknowledgments
Acknowledgments Support of QOS Enabled IP Services

  • Copper Mountain Networks

  • DSL Forum


Conclusion
Conclusion Support of QOS Enabled IP Services

  • 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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