Multimedia over DSL By Phil Moy

April 18, 2023 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

April 18, 2023 3

Central Office Wiring Center

BRAS Architecture Overview

ATM

ATM DSLAMs

RT DSLAMs

MTU DSLAMs

Communications Portal

Storage

Applications(eg, VPN)

ISPs / Internet

L3 Switch /IPSS

Voice Gateway

ATM or Ethernet

PSTN

Class 5

BRAS

Video Server

April 18, 2023 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

April 18, 2023 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

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

April 18, 2023 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

April 18, 2023 7

BRAS: Packet Processing

Cells . . .

Cell, PPP frame, PPPoE frame, L2TP frame, Ethernet frame, IP datagram

Header

Per VC decision:

Ingress

Egress

SAR

Mask

Relevant Bits

Integrated Forwarding/ Scheduling Process

Diff Serv Classification Best Effort Expedited Forwarding

Metering Priority Scheduling

SAR

AAL2PPPoE

IP GamingIP Video

April 18, 2023 8

BRAS: Differentiated ServicesDS3

DSL

DSL

OC-3

ATM WAN

BRAS Switch

CPE Router with NAT, or Ethernet

Modem,or IAD

Best effort to Serv Provider 1

Guaranteed to Serv Provider 1

Best effort to Serv Provider 2

Voice over IP

Aggregation Group 3

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

Aggregation Group 1

(IP)

Video Server

April 18, 2023 9

Alcatel ASAM1000

CopperEdgeCE200

Video onDemand

Display #2

OC-3cATM

DS3ATM

Web Browser #3

Set Top Box

NMS

Ethernet

TVRGroup

VantEdgeVE3000

Video Server

Set Top Box

Video onDemand

Display #1

AlcatelADSL CPE

AlcatelADSL CPE

ISP 1

ISP2

CelsianG.Shdsl

CPE

Web Browser #4

OC-3cATM

Web Browser #1

Web Browser #2 LAC#2

LAC#1

SmartbitsAlcatel

ADSL CPE

ATMNetwork

UBR VC

PPPoA

PPPoA

L2TPTunnel #1

PVC

nrtVBR VC

IP

IP nrtVBR VC

PPPoAL2TP

Tunnel #2PPPoAUBR VC

PPPoAPPPoA

UBR VC

PPPoE

ATM Cell Relay

PPPoE

PVC

UBR VC

PVC

UBR VC

Demo System

April 18, 2023 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

April 18, 2023 11

Acknowledgments

Copper Mountain Networks

DSL Forum

April 18, 2023 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?