SWITCHING ARCHITECTURES

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    X[JYHMJFK BWHMJYLHY\WLX Xmbrli.Nlnery Brhmjtlhturl

    Xmbrli.Nlijun Brhmjtlhturl

    Xpbhl.Ijvjsjef BrhmjtlhturlHressgbr Xwjthmjfk

    Gbfybf.Gbsli Xwjthmjfk

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    -2*XMBWLI.NLNEWZ BWHMJYLHY\WL \sls hennef pee` ed nlnery te guddlr pbhalts der b``

    jf`lts bfi eut`lts&

    Iub` pert nlnery?

    Slrnjts sjnu`tbfleus rlbi bfi wrjtl eplrbtjefs&

    Wliuhls tml tjnl rlqujrli te plrdern b slt ed eplrbtjefs gymb`d&

    Ehhupjls nerl spbhl tmbf b sjfk`l pert nlnery& Lxbnp`ls?

    HFLYs Srl`uil swjthm&

    Mjtbhmjs smbrli guddlr swjthm&

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    JfputNeiu`l

    Nlnery Heftre``lr

    JfputNeiu`l

    EutputNeiu`l

    EutputNeiu`l

    Hlftrb`

    Nlnery

    N

    \

    ]

    I

    LN

    \

    ]

    2

    F

    2

    F

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    ESLWBYJEFX?

    JFS\Y LFI? Sbhalts dren b`` jf`lts nu`tjp`lxli jfte sjfk`lstrlbn, wrjttlf te iub` pert nlnery&

    E\YS\Y LFI? Sbhalts rlbi eut slqulftjb``y,ilnu`tjp`lxli ef tml gbsjs ed tmljr eutkejfk pert jilftjdjlr&

    NLNEWZ HEFYWE@@LW? Ilhjils tml erilr jf wmjhmpbhalts brl wrjttlf bfi rlbi eut&

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    Bsplhts ed Xmbrli.Nlnery Brhmjtlhturl

    Guddlrjfk?

    Xmbrli guddlrjfk Bpprebhm& Nu`tj.hbstjfk?

    Fet wl`` sujtli der grebihbstjfk%nu`tjhbstjfk iul tehlftrb`jzli bpprebhm&

    Ywe tlhmfjquls tmbt jfherperbtl nu`tjhbstjfk?Hepy Fltweras?/ Nbals nu`tjp`l hepjls ed b nu`tjhbst pbhalt glderl pbhalt

    lftlrs tml swjthm&/ Bdtlr tmjs, lbhm pbhalt trlbtli bs ufjhbst pbhalt&

    / Fe& ed hepjls js lqub` te Fe& ed eut`lts te wmjhm erjkjfb`nu`tjhbst pbhalt wbs ilstjfli mbvjfk ijstjfht `bgl`&

    / Xjnp`jdjls jftlrfb` ilsjkf ed swjthm&/ Henp`jhbtli `ekjh js fllili bt glkjffjfk&

    / \fflhlssbry wbstbkl ed guddlrs bfi jftlrfb` hbpbhjty&

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    Biirlss Guddlrjfk?

    / Jfstlbi ed nbajfk nu`tjp`l hepjls ed pbhalts tmlnsl`vls,nu`tjp`l hepjls ed pbhalt biirlssls brl nbil&

    / [mlf b nu`tjhbst pbhalt brrjvls, b pejftlr lftry js hepjli jflbhm ed `ekjhb` qululs ed ilstjfli eut`lt&

    / Hefsjilrbg`l nlnery sbvli&

    / Xmbrli nlnery smeu`i eplrbtl bt F7 tjnls pert splli&

    / Jd F nu`tjhbst pbhalts brrjvl ilstjfli der b`` tml eut`lts,nlnery nust ie wrjtl F7 eplrbtjefs&

    / Hbf hbusl slvlrl shb`bgj`jty preg`lns&

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    Xhb`bgj`jty?

    Xmbrli nlnery iels fet shb`l vlry wl``&

    Nbjf preg`ln js Nlnery @eea.up tjnl& Der henp`ltl`y fef.g`ehajfk glmbvjer, getm rlbi bfi

    wrjtl nust tbal p`bhl bt F tjnls tml pert splli&

    Der F/F swjthm, mbvjfk

    / `jfas eplrbtjfk bt b splli T,/ Gus wjitm w,

    / Nlnery splli rlqujrli der sjfk`l pert js -7FT%w* Mz

    / Nlnery splli rlqujrli der iub` pert js -FT%w* Mz

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    -7*XMBWLI.NLIJ\N

    BWHMJYLHY\WL

    B grebihbst nlijun js usli te swjthm pbhalts te tmljrilstjfli eut`lts&

    Grebihbstjfk iefl tmreukm Yjnl Ijvjsjefnu`tjp`lxjfk&

    Lxbnp`ls?

    Derl Xystlns BX.]733 swjthm

    FLHs BYEN swjthm

    =

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    JfputNeiu`l

    Jfput

    Neiu`l

    Eutput

    Neiu`l

    EutputNeiu`l

    XwjthmjfkDbgrjh

    2

    F

    Dj`tlrjfk%Guddlrjfk

    Dj`tlrjfk%Guddlrjfk

    :

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    ESLWBYJEFX? JFS\Y NEI\@L?

    Iltlrnjfls tml eutkejfk pert ed pbhalt bs jt brrjvls&

    Yml eutkejfk pert b`efk wjtm etmlr jfdernbtjef `jal nu`tj.hbst jilftjdjlr, pbhalt prjerjty lth& js bttbhmli te tml pbhalt jfdern ed b reutjfk tbk wmjhm js usli der sugslqulftprehlssjfk ed tml pbhalt&

    Sbhalt js tmlf grebihbstli te lbhm eut`lt, usjfk tml

    grebihbstjfk nlijun&

    E\YS\Y NEI\@L?

    Biirlss dj`tlrs ilheil tml eutkejfk pert biirlss ed lbhm

    pbhalt& Jd pbhalt js ilstjfli der tmbt eut`lt, tml pbhalt js hepjli te

    tml eutput guddlr, etmlrwjsl, tml pbhalt js ijshbrili&

    Guddlrli pbhalts brl slrvli bs bfi wmlf tml eutkejfktrbfsnjssjef `jfa js drll&

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    Bsplhts ed Xmbrli.Nlijun Brhmjtlhturl Guddlrjfk?Eutput Guddlrjfk js usli&

    Nust eplrbtl bt F tjnls tml pert splli& Lbhm dj`tlrjfk bfi guddlrjfk neiu`l b`se rlqujrls tmjs splli.up

    dbhter&

    Nu`tj.hbstjfk?Ef`y rlqujrlnlft js tmbt biirlss dj`tlr nust gl hbpbg`l ed

    rlhekfjzjfk b nu`tj.hbst biirlss&Iefl gy Gjt.nbp vlhter -b slt gjt eut`lt herrlspefijfk te tmjs

    gjt nust bhhlpt tml pbhalt*&

    Xhb`bgj`jty? Xplli.up dbhter mbnplrs shb`bgj`jty&Fet Xujtbg`l der `brkl swjthmjfk systlns& Der F/F swjthm, mbvjfk

    / `jfas eplrbtjfk bt b splli T,

    / Gus wjitm w,

    / Nlnery splli rlqujrli js -FT%w* Mz 22

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    -8*XSBHL.IJTJXJEF

    BWHMJYLHY\WL Hressgbr Xwjthmjfk

    Gbfybf.Gbsli Xwjthmjfk

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    -8*-j*HWEXXGBW X[JYHMJFK Hefsjsts ed F/F nbtrjx ed hresspejfts lbhm ed wmjhm hbf ljtmlr

    gl lfbg`li er ijsbg`li&

    [mlf b hresspejft js lfbg`li, b ilijhbtli pbtm js slt gltwllfbf jf`lt bfi bf eut`lt&

    Der preplr dufhtjefjfk ed swjthm, ef`y efl hresspejftherrlspefijfk te bf eutput `jfa hbf gl lfbg`li&

    Gut bf jfput hbf gl hefflhtli te nerl tmbf efl eutput `jfa,prevjili fe etmlr jfput js hefflhtli te tml kjvlf slt edeutputs&

    Hresspejfts hbf gl jnp`lnlftli usjfk trbfsnjssjef kbtls,

    wmjhm hbf lxjst jf twe stbtls? Hress stbtl? fe hefflhtjef js tmlrl gltwllf merjzeftb` bfi vlrtjhb`

    `jfls, j&l&, tml vlrtjhb` jfput js hefflhtli te vlrtjhb` eutput bfisbnl jf hbsl ed merjzeftb`&

    Gbr stbtl? vlrtjhb` jfput js hefflhtli te merjzeftb` eutput bfi

    merjzeftb` jfput js hefflhtli te vlrtjhb` eutput& 28

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    JN

    JN

    JN

    EN

    EN

    E

    N

    Heftre` @ekjh 29

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    Bsplhts ed Hressgbr Xwjthm Brhmjtlhturl Guddlrjfk?

    Jfput Guddlrjfk?.

    DJDE qululs bt lbhm jf`lt gut preg`ln ed ME@ g`ehajfkbfi lxtlrfb` g`ehajfk lxjsts&

    ME@ g`ehajfk hbf gl se`vli usjfk 7 bpprebhmls? Hlftrb`jzli heftre``lr?.

    Djfis b nbtrjx hefdjkurbtjef tmbt nbxjnjzls funglr edpbhalts gljfk swjthmli jf b sjfk`l tjnl s`et&

    Yml heftre``lr smeu`i mbvl k`egb` afew`likl ed pbhaltsprlslft jf jfput qululs bfi ilstjfli eut`lt der lbhm pbhalt&

    Henp`jhbtls heftre``lr ilsjkf bfi jfhrlbsls hest ed tml swjthm&

    Ijstrjgutli Heftre``lr?.

    Lbhm eutput nbjftbjfs jts slpbrbtl brgjtlr&

    Brgjtlr jfsplhts pbhalts henjfk dren b`` jfputs bfihmeesls efl ed tmln&

    Heftre` sjkfb` brl slft te efl jf`lt, rlqulstjfk te g`ehatrbfsnjssjef&

    23, tml pbhalt js derwbrili teupplr eutput etmlrwjsl te `ewlr eutput&

    Xjfhl efhl tml pert biirlss js ilhjili, tml pbhalt js butenbtjhb``y reutlite splhjdjh eutput&

    2=

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    2:

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    @jnjtbtjefs?

    Jftlrfb` G`ehajfk

    Lxtlrfb` G`ehajfk

    Fef.rlb`jzbg`l plrnutbtjef

    G`ehajfk Xe`utjefs jf Gbfybf Fltweras?

    Guddlrjfk? Jfput Guddlrjfk

    Eutput Guddlrjfk

    Jftlrfb` Guddlrjfk?

    Jfput Guddlrjfk Eutput Guddlrjfk

    Xmbrli Guddlrjfk

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    Jftlrfb` Guddlrjfk?Efl er twe hefd`jhtjfk pbhalts jf b 7/7 swjthm js b``ewli

    te pbss tmreukm, wmj`l slhefi efl js guddlrli& Jf tml flxt tjnl s`et, der tml guddlrli pbhalt te nevl

    derwbri, ljtmlr tml guddlr bt flxt stbkl smeu`i gl lnptyer guddlrli pbhalt bt flxt stbkl smeu`i nevl derwbri&

    Jd fefl ed tmlsl hefijtjefs me`i, upstrlbn heftre`sjkfb` brl usli te jfdern tml guddlrli pbhalt te stby jfguddlr&

    Il`by

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    Xertjfk?

    Sbhalts brl sertli bhherijfk te tmljr eutput biirlssls&

    Gy jfteiuhjfk b sertlr `jal, Gbthmlr.Gjetefjh sert fltwera,tml fltwera glhenls jftlrfb``y fef.g`ehajfk&

    Nu`tjhbstjfk?

    Ijddjhu`t te jfherperbttl&

    Hepy fltwera hbf gl jftreiuhli& Nlhmbfjsn jfh`uils?

    Hepy Fltweras? Nbals nu`tjp`l hepjls ed nu`tj.hbst pbhalts&

    Ijstrjgutjef Fltwera?Ijstrjgutls pbhalts lvlf`y bhress b`` jfputse

    ed reutjfk fltweras& Gltwllf Hepy bfi ijstrjgutjef fltweras js GKY -Grebihbst bfi

    kreup trbfs`bter* wmjhm trbfs`btls ilstjfbtjef biirlss ed hepjls tebppreprjbtl ilstjfbtjef biirlss&

    Weutjfk fltwera? Derwbris tml pbhalts te bppreprjbtl eutput pert&79

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    Xhb`bgj`jty?

    Ymly hbf gl hefstruhtli dren snb``lr swjthmls&

    Wlku`brjty bfi jftlrhefflhtjef pbttlrf nbal tmljr T@XJjnp`lnlftbtjef preplr&

    Ymreukmput ilplfis ef sjzl ed guddlr& -Ijrlht`yprepertjefb`*&

    7