Published on November 28, 2007
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 ModemsKeeping 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-059Evolving 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!