Class Note for EECS 563 with Professor Frost at KU
Class Note for EECS 563 with Professor Frost at KU
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This 12 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at Kansas taught by a professor in Fall. Since its upload, it has received 25 views.
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Date Created: 02/06/15
Communications Networks Landscape and Issues 2 Victor S Frost Dan F Servey Distinguished Professor Electrical Engineering and Computer Science University of Kansas 2291 Irving Hill Dr Lawrence Kansas 66045 Phone 785 8644833 FAX785 8647789 email frosteecs kuedu httpwwwittc kuedu Landscape 1 Outline I Drivers Customer expectations I Drivers Technology lThe Issues in Networking Landscape 2 Communications Landscape I Voice I Data E mail Web Network based applications image I Video Broadcast Video on Demand Video Over the Web I Wired amp wireless I Today gt Separate networks I Rapidly emerging gt An integrated packet network I Triple Play Voice Internet Video Landscape 3 Drivers Customer Expectations I Sense of always connected I Instant response high bandwidth I Ubiquitous connectivity I Multimedia support I Conferencing simultaneous communications with multiple users Landscape 4 Drivers Customer expectations I Mobility support I Personalized information services I Context sensitive information services I Absolutely secure I Cheap Landscape 5 The Value of the Net I Metcalf s Law The value of a network increases as the square of the number of connected users some say nlogn I The value of a network increases as the square of the access bandwidth I The value of a network increases as the square of PC power I Number of connected users bandwidth user and host capabilities are increasing gt Value of the Net T Landscape 6 Drivers Technology Traffic Growth I Sidgemore s Law Internet traffic doubles every three months original over hype Myth I However Internet still growing I Access rates t 1 5 0 gt Modem 50kbs gt CableDSL 1 10 Mbs gt FTTH 100Mbs a h or statistics html aum mmpm su tm mu mmmu I See htt wwwc her so r zu cm mu sass was my Janas snag Jawm 1mm Snume mm M Lunar Internet Sn wzre Cnnsnnlum ltwwwscnmgt Landscape 7 Drivers Technology I Moore s Law gt Processing power doubles every 18 months gt Moore s Law has been true for the past 20 years I Gilder s Law The Law of Telecoms gt Total telecommunications system capacity b s triples every three years Landscape 8 mum m Mm 3 Date of first use Pram Ttltcnm Edhnlm39s Lw 0f BandwidthEEE Sptclxllmylnly 2mm l UMb 294 MM Elhernel Ellvarmzrs K Evlmrnel T HE meLlNE 7 IBM 2 m 2 9 m S a mmcl a mum quot 552 5 h j E 2 95mm N I E mm quot M MU Orbs m h We Have no J 39M quotMilerquot ES EL W J 5EKhs R Wchevradmnmucm F W mm m Alntmm 2am e 3 W m mum Wireless Mobile 3 dzmaa a mg 5 Nomadic Dialup 9a a m Landscape 9 Issues in Networking Campus Example Telephone 15000 Telephones Ellsworth Hall ATampT Landscape 10 Issues in Networking I How many lines do you buy from ATampT I To guarantee every campus phone can always get an outside line N15000 I Too expensive lines cost per month Landscape 11 Issues in Networking I Solution Gamble I Assume gt During the busy hour of the day 10 of the phones makes 2 calls gt The call duration is about 3 min gt The customers will tolerate a 1 in 100 chance of getting a busy signal because all the lines to ATampT are busy Landscape 12 Issues in Networking I Apply basic traffic engineering I Erlang s Blocking Equation l N is about 160 ltlt15000 Issues in Networking Printer Link Speed C bs Example puter Center Youngberg Hall Landscape 14 Issues in Networking I Assume each customer and printer is connected using Ethernet ie at 1 Gbs I How fast does the link between Youngberg and the computer center have to be to guarantee all the customers can use the 1 Gb s I C 55 Gbs I Too expensive Landscape 15 Issues in Networking I Solution Gamble I Assume gt Each host computer breaks up messages into smallish units called packets gt Packets from each customer are sent to a waiting line buffer to wait their turn to use the link gt Packets arriving to a full buffer are discarded gt Discarded packets are retransmitted later I Customer information now experiences gt Delay waiting in line gt Loss Landscape 16 Issues in Networking I Customer performance requirements gt Delay lt 100ms gt Loss lt 10 I Assume customer traffic gt Average packet length 9000 bytes gt Packets are generated at a rate of 2 per second I Using basic queueing theory gt C 86 Mbs ltlt 55 Gbs gt System size gt 7 packets Landscape1 7 Issues in Networking Ping Packet Delay and Loss 60 12 What happens when you lose your gamble m o s 0 See httpaveragemiqnet for current Internet performance data m a Average Ping Delay Miniseconds m o a 2 m uamadsso1 amped Bugd aBeraAv Average Delay Average Loss From The Dark Fiber 0 ya Paradigmquot mmmmmmwwmmggmw GilderTechnologyReporl mg i 2 T3 95 a 4313 VolllN02Feb1997 02022lt 3 m02 Landscape18 Issues in Networking Sharing Implies Resource Control and Management Network provider time scale management Plane gt Management gt Provisioning Call time scale control plane gt Refer back to signaling examples I Customer data time scale userdata plane gt Process information ow at rates Control network resources at time scales ranging from 106 sec to months A full set of protocols often with components in common define a plane Landscape 21 Vumm MMugBmEnL Plnnnmg mmim A mm Tm Sam M mmm I Mww um um I m Wm mm mm News Clinan r w t Wunnmgixmnm mm aumv Fluu andcivacmDeswnmEammumcahamandcamvutev mm M 7mm Meam vaanKauvmann 2mm Landscape 22 11 Issues in Networking Protocols I Protocols are the rules algorithms that govern the interactions between network elements The process of making a telephone call is governed by a protocol refer to signaling example Modems execute this protocol automatically I Protocols must be standardized Landscape 23 Issues in Networking Protocols I Protocols are algorithms ie software sometimes ii39nplemente in hardware I Protocols must run in real time I Peer protocols must be executed at both ends of the connection ie run on geographically distributed network elements I Protocol must work with inaccurate or imperfect knowledge gt Packets are lost due to link error or traffic congestions gt Instantaneous traffic demands are unknown Landscape 24 12 Issues in Networking Protocols are real time distributed systems that must meet Constraints eg Quality of Service given imperfect knowledge Landscape 25 Research Networking Facilities at the University of Kansas Information and Telecommunications Technology Center I 20 Gbs WDM quot i Lightwave System I 397 Fiber Terminal 25 Mbs Wireless System 40 Gbs WDM gt Lightwave System 13
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