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Digital Subscriber Line (DSL)

Digital Subscriber Line (DSL). Mary L. Pretz-Lawson Assistant Director, Computing Services Carnegie Mellon University 5000 Forbes Avenue Pittsburgh, PA 15213 412-268-2642 mlpl@cmu.edu www.cmu.edu/computing/dsl. 4,500 undergrads 2,500 grad students 900 FT faculty 2,000 FT staff

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Digital Subscriber Line (DSL)

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  1. Digital Subscriber Line (DSL) Mary L. Pretz-Lawson Assistant Director, Computing Services Carnegie Mellon University 5000 Forbes Avenue Pittsburgh, PA 15213 412-268-2642 mlpl@cmu.edu www.cmu.edu/computing/dsl

  2. 4,500 undergrads 2,500 grad students 900 FT faculty 2,000 FT staff 66 buildings on 100 acres Excels in engineering, computer science, drama, business 85%+ of students regularly use computers Carnegie Mellon Statistics Mary L. Pretz-Lawson, Carnegie Mellon

  3. Computing & Communications • 8,400 telephone lines with Verizon (Bell Atlantic) Centrex on Nortel DMS switch • 75% IBM Type; 25% Cat 5 cabling • 70% of traffic is IP; 30% is IPX and AppleTalk • Cisco 7500s in bridged network moving to routed network (70% complete) • Installing Gigabit Ethernet backbone using Cisco 6509s with redundant core (70% complete) Mary L. Pretz-Lawson, Carnegie Mellon

  4. Internet Connectivity • Commodity connection • ATM OC3 link via Pittsburgh Supercomputing Center • 45 Mbps total to ATT, SurfNet, Sprint, UUNet • vBNS connection • OC3 link via School of Comp Science • Abilene connection • OC3 link to be upgraded to OC12 link Mary L. Pretz-Lawson, Carnegie Mellon

  5. Carnegie Mellon Remote Access • 300+ v.90 digital modem pool • Early DSL trials starting in 1996 • Production DSL service in April 1999 • 600+ DSL users today, 575 with Verizon, 25 with North Pittsburgh • CMU is ISP with ATM (Verizon) or frame (NPTC) connection to carrier Mary L. Pretz-Lawson, Carnegie Mellon

  6. ADSL - Splitting the Bandwidth

  7. Carnegie Mellon as DSL ISP • Issue CMU IP addresses • Network throughput 6 times faster on CMU DSL vs Verizon DSL • Configure PVCs and router in compliance with Verizon’s network (ARG!) • Computing Services Help Center takes trouble calls Mary L. Pretz-Lawson, Carnegie Mellon

  8. ADSL (incl ISP) -640K x 90K @$40-50 1.6M x 90K @$90-100 7.1M x 680K @$175-190 Install $0-99 Modem $0-250 SDSL (incl ISP) 128K @$55-100 384K @$75-150 768K @$100-175 1.544M @$200-400 Install $200-400 including modem DSL Monthly Price Ranges in Western Pennsylvania Mary L. Pretz-Lawson, Carnegie Mellon

  9. State of DSL in Western PA • Coverage • varies by provider • know your key areas (Squirrel Hill) • Pricing = lower costs in future? YES! • Increased competition and lower cost cable modems • FCC ruling on requiring RBOCs to line share with DSL providers Mary L. Pretz-Lawson, Carnegie Mellon

  10. …State of DSL in Western PA • Target Markets • is provider focusing on consumer or business applications? • Internet surfing vs telecommuting vs research vs remote office requirements • Market Share • usually translates to broadest coverage • doesn’t always translate to best service/support Mary L. Pretz-Lawson, Carnegie Mellon

  11. …State of DSL in Western PA • Ordering/Support • some providers still using phone/FAX ordering • most moving to online, web-based ordering and trouble tickets • Service Level Agreements • rarely available but important service issue • support infrastructures not yet well developed • key area for differentiation between providers Mary L. Pretz-Lawson, Carnegie Mellon

  12. Digital Subscriber Line Futures • Verizon has turned up residential service in most COs • Facility-based providers and resellers offering alternate DSL services • Competitive DSL providers & ILECs forging liaisons (Verizon and Northpoint) Mary L. Pretz-Lawson, Carnegie Mellon

  13. ...Digital Subscriber Line Futures • Standards still evolving (CAP vs DMT modulation scheme) • Splitterless technology with user-installed line filters • DSL over fiber facilities; lower speed DSL-Lite for longer distances • Business-grade SDSL with service level agreements Mary L. Pretz-Lawson, Carnegie Mellon

  14. Carnegie Mellon DSL Futures • New part time DSL Technical Assistant • Outsourcing ISP functions • Local peering with ISPs to minimize hops • VPN to provide CMU IP addresses • ISP takes trouble calls • Conversion to new service model in summer 2001 Mary L. Pretz-Lawson, Carnegie Mellon

  15. Other Broadband Offerings • Wireless local loop access alternatives • Cable modems race with DSL for market share • some areas need cable plant upgrades • Satellite-based DSL services appearing • Fiber to the home coming soon? • CLECs pursuing Voice over DSL to small/medium businesses • 16 voice lines + high speed data = 1 copper pair Mary L. Pretz-Lawson, Carnegie Mellon

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