Presentation Transcript
Asymmetric Digital Subscriber Line Tutorial: Asymmetric Digital Subscriber Line Tutorial
Tutorial Outline: What Is ADSL ?
How Does It Work ?
Architectural Options
What Can ADSL Do ?
Status of the Technology
The Future Tutorial Outline
Market Status of ADSL Technology: Market Status of ADSL Technology ADSL is the #1 Broadband Choice in the World
ADSL is available in every region of the world
ADSL is capable of providing up to 50 Mbp, and supports voice, video and data. Other forms of DSL can reach even 100 Mbps!
The new DSL network is IP-centric
There is broad equipment interoperability and there are established test specifications for ADSL, ADSL2plus, SHDSL, and VDSL
Finally, ADSL and home networking are a natural fit as DSL effectively supports multiple applications for multiple uses via each DSL connection.
“Evolution of Digital Access”: Voiceband Modem ISDN ADSL FTTH FTTx, VDSL2,
ADSL2plus Enhanced
Copper Hybrid Fibre/Copper Pure Fibre “Evolution of Digital Access”
Today there are various DSL Technology Options: Today there are various DSL Technology Options
Many options: Many options Distance x1000 Feet ADSL2+ VDSL2 Bonded ADSL2+ 2.4 GPON (32-split) EFM Active 100Mbps EFM Active 1Gig
Simple overview of ADSL in the phone network: Simple overview of ADSL in the phone network POTS- Plain Old Telephone Service
ADSL Equipment: Residential Customer ADSL Modem or
Gateway Customer Premises Equipment Central Office Building ADSL Rack of Line Cards Standard Telephone Lines ADSL Equipment
Reach of ADSL: Reach of ADSL Typically ADSL can reach as far as 18 kft from the central office
To extend the reach, service providers have a host of options, outlined in the white paper DSL Anywhere v.2
“Today’s Typical Network” : ADSL: ADSL 1.5 to 8Mbit/s 9.6 to 640kbit/s Broadband
Network Internet Video Servers Live
Broadcast Telephone
Network “Today’s Typical Network” : ADSL
In the home: ADSL Modems Keeping internet traffic from interfering with phone service: ADSL
Modem POTS
Filter Mbit/s kbit/s ADSL
Modem POTS
Filter POTS
Linecard Mbit/s kbit/s Line Exchange End Customer End In the home: ADSL Modems Keeping internet traffic from interfering with phone service
Basic Architecture: CPE
or PC ISP ADSL
Linecard Router Ethernet
Hub/Switch 10 base T
Ethernet 10 base T
Ethernet 10 base T
or
100 base T 45 or 155
Mbit/s ATM or Ethernet ADSL
Remote Basic Architecture
IP Architecture Quality of Service (QoS) Breakthrough!: IP Architecture Quality of Service (QoS) Breakthrough! DSL Forum’s TR-059 specifies IP Routed Network Architecture to support a mix of IP based services including IP Video from an Application Service Provider, by employing DiffServ.
Or IP Transport
Building on TR-059 Evolving Broadband Access: Building on TR-059 Evolving Broadband Access TR-101: Migration to Ethernet Based DSL Aggregation
WT-156: Using GPON Access in the Context of TR-101
Universal Access Network Architecture: Fiber or Copper
Slide15: What can you do with ADSL? Internet Access & File Sharing
Video
Broadcast TV
Video On Demand
Voice over IP via DSL
Teleworking
Online Education & Shopping
Telemedicine
Online Gaming
For most applications speed is not enough- Customers want a Quality Experience: For most applications speed is not enough- Customers want a Quality Experience New! DSL Forum TR-126 : Triple Play Quality of Experience (QoE) Requirements
Compendium of guidelines for QoE dimensions, measurement and provisioning for different applications:
Broadcast TV, VoD, Premium Video
Including Packet Loss Ratio guidelines for SDTV and HDTV
Voice
Best Effort Internet Access & others
What is the DSL Forum doing to help develop the potential of DSL?: What is the DSL Forum doing to help develop the potential of DSL?
Current Activities:
Technical
Testing & Interoperability
Interoperability test plans for VDSL2
Plugfests & ITL program
Operations & Network Management
ADSL2/2plus & VDSL/2 element management
BroadbandHome Technical
CPE requirements & management
TR-069 remote management work & related test events
Architecture
IP Ethernet
Policy Control Framework
Video QoE over DSL Marketing
BroadbandSuite Education Plan
Application Notes for service delivery of key applications, ie IPTV, VoIP, Teleconferencing
TR & Interop messaging
Summit / Best Practices
Executive Summits & industry panels
Ambassador
Global speakers bureau
Marketing Communications
Tradeshows, Conferences, Website, Events & Public Relations Current Activities
What’s Next? New Commercial Applications: What’s Next? New Commercial Applications Alternative access solution for WiFi, WiMAX, Cell Tower backhaul and beyond
Use of DSL to feed WiFi Hotspots: BRAS DSLAM ADSL Modem Temporary
Office DSLAM SHDSL Modem Home & Banks Airport,
Train Terminal,
Hotel, University, Office DSLAM Use of DSL to feed WiFi Hotspots Rule #1 : Make sure the remote DSL router will “auto re-boot”!
VoIP over DSL is also used at these Wi-Fi hotspots
Future Opportunities : WiMax (Broadband Radio) : Future Opportunities : WiMax (Broadband Radio) BRAS Middle Mile
Aggregation
Metronodes
& Core DSLAM DSL modem WiMAX combined with DSL) Internet GW voice GW Base stations
(could be on CO roof) fixed nomadic
Internet
2G & 3G Mobile Backhaul today: 2G & 3G Mobile Backhaul today 3G Node B 3G RNC E1
ATM ATM
Network ATM N x E1
ATM
3G Node B
Use of SHDSL to feed 3G cellular base-stations over ATM DSL: Use of SHDSL to feed 3G cellular base-stations over ATM DSL ATM Network Modem CES i/if Leased Line NT DSLAM CR I/f ATM / Sym DSL Service Management VPN / Billing / SLA Central Office Node B Node B RNC This was easy with ATM DSL networks :
Just use ATM AAL2 for 3G or
ATM AAL1 (TDM circuit emulation) for 2G
BUT – DSL Networks are moving away from
ATM to Ethernet & IP ATM / Sym DSL ATM
Switch Modem CR I/f BTS
Drivers to use DSL for Mobile Backhaul: Drivers to use DSL for Mobile Backhaul Reduce today’s 2G & 3G transmission costs (voice & data)
Potential application for SHDSL & bonded SHDSL to replace n*T1 and n*E1 transport
Focus on up to 4 T1s or E1s per cell site
beyond that radio/microwave backhaul is probably more cost effective
DSL-based solutions must be competitive w.r.t. T1 & E1 leased line costs
Reduce future transmission costs associated with High Speed Downlink Packet Access (HSDPA) data
Possible application for ADSL2plus transport
Reduce future transmission costs associated with High Speed Uplink Packet Access (HSUPA) data
Possible application for ADSL2plus Annex M & bonded ADSL2plus Annex M
Conclusion- the DSL Forum’s Role: Conclusion- the DSL Forum’s Role
Active Liaisons- We don’t work alone: Active Liaisons- We don’t work alone
DSL Forum- Continuous work to enhance DSL: DSL Forum- Continuous work to enhance DSL
Asymmetrical Digital Subscriber Line Introduction Slide Show : Asymmetrical Digital Subscriber Line Introduction Slide Show Thank You for Viewing!