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Digital Subscriber Line (DSL) Mary L. Pretz-Lawson Assistant Director, Computing Services Carnegie Mellon University 5000 Forbes Avenue Pittsburgh, PA.

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Presentation on theme: "Digital Subscriber Line (DSL) Mary L. Pretz-Lawson Assistant Director, Computing Services Carnegie Mellon University 5000 Forbes Avenue Pittsburgh, PA."— Presentation transcript:

1 Digital Subscriber Line (DSL) Mary L. Pretz-Lawson Assistant Director, Computing Services Carnegie Mellon University 5000 Forbes Avenue Pittsburgh, PA

2 10/11/00Mary L. Pretz-Lawson, Carnegie Mellon 2 Carnegie Mellon Statistics 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

3 10/11/00Mary 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)

4 10/11/00Mary 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

5 10/11/00Mary 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 DSL users today, 575 with Verizon, 25 with North Pittsburgh CMU is ISP with ATM (Verizon) or frame (NPTC) connection to carrier

6 ADSL - Splitting the Bandwidth

7 10/11/00Mary L. Pretz-Lawson, Carnegie Mellon 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

8 10/11/00Mary L. Pretz-Lawson, Carnegie Mellon 8 DSL Monthly Price Ranges in Western Pennsylvania ADSL (incl ISP) –-640K x –1.6M x –7.1M x 190 Install $0-99 Modem $0-250 SDSL (incl ISP) Install $ including modem

9 10/11/00Mary 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

10 10/11/00Mary 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

11 10/11/00Mary 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

12 10/11/00Mary 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)

13 10/11/00Mary 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

14 10/11/00Mary 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

15 10/11/00Mary 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


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