Internet Access, Challenges and Applications
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1 1 Internet Access, Challenges and Applications Henning Schulzrinne Dept. of Computer Science Columbia University New York, New York September, 2000
2 2 Overview New Internet services Structured data Event notification Internet technical challenges Internet access alternatives Internet access devices New Internet applications
3 3 New Internet services streaming services (radio, movie clips?) event notification and presence peer-to-peer object distribution (e.g., Napster) Internet telephony (10% of international long distance) mobility
4 4 Internet challenges address exhaustion! NAT kludges, IPv6 traffic growth: doubling/yearly availability (99.9%! %) wireless and mobile access security for infrastructure and access
5 5 Structured information delivery traditionally, information delivered for presentation ASCII for HTML for web presentation Word, PDF for documents loses meaning of data items screen scraping early attempt: EDI
6 6 XML XML (extended markup language): text description of data objects, marked up with tags XML just describes data, not processes can be delivered via HTTP (web), ,... is text, but not meant to be read by humans verbose, but can be compressed via standard text compression rendered by separate set of rules (XSL)
7 7 XML example <?xml version="1.0" standalone="yes"?> <library> <book> <title>the Grapes of Wrath</title> <author>john Steinbeck</author> <publisher>viking Press</publisher> <pub_year>1939</pub_year> <call_no>pz3.s8195gr6<call_no> </book> </library>
8 8 Event notification notify subscriber when designated events occur example: presence (buddy lists) generalizable to physical measurements, news events, financial data,... currently proprietary (AOL, MSN, Yahoo), presence only on-going work in Internet Engineering Task Force (IETF)
9 9 Consumer Internet access alternatives Modem ISP $20 Cable modem $40 DSL $40+ Wireless $30 + volume or $60 Satellite $20 Business rates depend on local access
10 10 Modem modem speed limited to about 33.6 kb/s upstream and 56 kb/s downstream no major advances in modems on horizon 52% of US households have Internet connectivity
11 11 (A)DSL asymmetric for consumers: e.g., 640 kb/s downstream, 96 kb/s upstream practically, up to 1.5 Mb/s now, can be self-installed probably will largely replace T-1 lines for business (about $250 - $400/month) both DSL and cable modems oversubscribe trunks projected at 7.7m by 2002, 9.6m by 2003 Among the nation s 30,000 central phone offices, 4,300 were equipped for DSL as of the end of September [1999], according to TeleChoice, a consulting firm in Boston.... there were 300,000 residential DSL subscribers and 1.1 million cable modem subscribers at the end of The number of residential DSL subscribers is expected to grow to 900,000 by the end of [actually, total of 1.2M by 6/00, with 12% business]
12 12 DSL varieties Service up (Mb/s) down application Asymmetric DSL (ADSL) residential Symmetric DSL (SDSL) small business High Speed DSL (HDSL) T1 replacement Very High Speed DSL (VDSL) limited distance Universal ADSL G.lite, splitterless Only ADSL and U-ADSL widely available.
13 13 Cable modems standardization in progress (DOCSIS) theory, 30 Mb/s downstream, but shared RoadRunner advertises 1.5 Mb/s downstream, 300 kb/s upstream
14 14 Current wireless data access packet data or modem (circuit) almost no packet data coverage outside metropolitan areas Service max. min. type Ardis packet CDPD 19.2 packet Cellular dial up GSM 9.6 dial up Metricom 33.6 dial up/packet RAM Mobile Data 8.0 packet indoor coverage depends on service expensive: $0.10 to $0.30/kB packet, $0.002/kB circuit also: GSM short message service (SMS), limited to 160 bytes
15 15 Near-term wireless access: Ricochet (Metricom) 128 kb/s IP data, from lamp posts San Diego and Atlanta now Baltimore, Boston, Chicago, Dallas/Ft Worth, Denver, Detroit, Houston, Kansas City, Los Angeles, Miami, Minneapolis, New York City, Philadelphia, Phoenix, San Francisco/San Jose, Salt Lake City, Seattle, St Louis, Washington, D.C. in progress
16 16 WAP (Wireless Access Protocol) average web page contains 18 objects, 3.8 kb each = 68.4 kb, but only 2 kb is text average (mine...):8kb 100-pixel phones separate protocol stack, similar to IP, operates over SMS, GSM,... need to create separate content for WAP, often for each phone usability? interoperability? walled garden see also NTT DoCoMo
17 17 License-free wireless 2.4 GHz spread spectrum ( ISM band ) IEEE b: up to 11 Mb/s, downgrades to 1 Mb/s depending on distance to base station 100 mw power, limited to 100 to 300 ft e.g., WaveLAN (Orinoco), Apple AirPort, Compaq, 3Com,... needs access points ($300) with Ethernet interface e.g., Wayport service in hotels and some airports
18 18 BlueTooth short-range wireless (30 ) inexpensive transmitters: goal of $5 1Mb/sin2.4GHz long-delayed initial products: wire replacements (headset cell phone)
19 19 Vertical Blanking Interval (VBI) and HDTV Use existing TV channels for shared, one-way data distribution VBI: space between TV images, about 150 kb/s VBI used by PBS, but apparently discontinued each channel about 27 Mb/s HDTV legality of HDTV channel use questionable DirecPC satellite: theoretically, 400 kb/s
20 20 Third-Generation wireless (3G) oftenreferredtoasumts operates between 1.8 and 2.1 GHz in flux, with goal of IP to handset multiple standards organizations, such as 3GPP, MWIF, 3GPP2 theoretically, 2 Mb/s, practically <144 kb/s for mobile users very expensive spectrum (UK: $35b) first deployments in 2001?
21 21 Non-PC Internet access PalmPilot (AvantGo), WinCE WAP (limited content) Internet appliances (e.g., i-opener) Internet telephones (e.g., i.picasso, Pingtel)
22 i-opener Internet appliance 22
23 Pingtel Internet phone 23
24 24 Summary add content-based delivery to presentation delivery slow transition to DSL and cable modems wide-area wireless data still mostly hype local wireless data access spreading fast many new ways to access Internet beyond the PC
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