Oct 10, 2014

What is Wi-Fi and how does it work ? Sinhala post

http://www.aluth.com/2014/01/wifi.html
wifi .ek ish,a, oek .kak isxyf,kau lshjkak fï jákd ,smsh'
wifi .ek fï jákd jev igyk bÈßm;a lf,a ì%;dkHfha n¾lskayeïIh¾ m%foaYfha mdi,a .=rejrfhl=f.a w;aoelSuls'


Tyq lshd isáfha ;u mx;shg jh¾,ia bkag¾fkÜ iïnkaOh ,nd fokakg fhdod .efkk rjqgrh l%shd;aul l, úg ysiroh yd Tlaldrh we;s jk njhs'

tu t,s lsÍu ´iafia ish .fõIKd;aul m%jD;a;s l,dj fufyhjQ BBC lSfõ jhs-*hs iïíOh we;s ,emafgdma mß.Khla wi, me;sfrk ix{dj, ^Signal& n,iïmkaklu cx.u ÿrl:k l=¿kla <. we;s ix{d fuka ;=ka .=Khla njhs'

fï m%jD;a;sh iu. jhs-*hs ;dlaIKh fi!LHhg fydoo keoao hkak .ek ixjdoh biau;= jqfKah' ì%;dkHfha fi!LH wdrlaIl tackaisfha ^Health Protection Agency& iNdm;s Y%Su;a ú,shï iagqj¾Ü lSfõ jhs*hs .ek kej; i,kd ne,Sula wjYH njhs'

ta iu.u ì%;dkHfha cx.u ikaksfõokh iu fi!LH m¾fhaIK wdh;kfha ^ MTHR - Mobile Telecommunications and Health Research & iNdm;s uydpd¾h ,õß pe,sia lSfõ jhs*hs rjqgrhla wi, ;sfnk ix{dj, m%n,;dj rcfha iïu; m%ñ;shg jvd yhish .=khlska ÿ¾j, njhs' tksid jhs*hs j,g ìh úh hq;= ke;s nj Tyqf.a woyihs'


wjika jYfhka ì%;dfkHfha fi!LH wdrlaIl tackaish fï .ek ;Skaÿjla ÿkafkah' Tjqka lSfõ jhs*hs ix{d we;s ;ekl hfula wjqreoaola ;siafia jdä ù isák úg isrerg w;=¿jk lsrK m%udKh iudk jkafka úkdä úiail cx.u ÿrl:k ixjdohl§ isrerg w;=¿jk lsrK m%udKh njhs'

flfia fj;;a uyckhdf.a isf;ys we;s jQ ìh ;=rka lrkakg fï jehu iu;aj ke;'

jhs-*hs ;dlaIKfhka /yeka rys; bkag¾fkÜ iïnkaOh ,nd .kakka úäfhda l%Svd lrkakka jeks fndfyda fokd fï .ek l=;=y,fhka isákafka ta ksidh' jhs-*hs hkq ^Wireless Fidelity& hk iïmQ¾K ku flálr ilid.;a flá fhÿuls' fï fhÿfuka yÿkajkafk /yeka rys; cd,hla ^Wireless Network& yryd f;dr;=re m;=rejd yeÍfï ^úldIKh lsÍfï& m%ñ;shhs'

/yeka rys; cd, yryd f;dr;=re yqjudre jkafka fi,shq,¾ ÿrl;k" rEmjdyskS" f¾äfhda hka;% jeks WmlrKj, fhdod.kakdla fuka f¾äfhda ;rx.j,sks' fufia f¾äfhda ;rx. iïfma%YKh ioyd ;sìh hq;= uQ,sl ´kElï jkafka jh¾,ia rjqgrhls'

fuu rjqgrfha ;sfnk wekagkd u.ska mß.Kl o;a; f¾äfhda ;rx. njg yrjkq ,nhs fï ioyd mß.Klfha ;sìh hq;= wjYH;djh jkafka jhs-*hs wevemagrhls' fuh hQtiaî wevemagrhla ke;skï mSis ldâ tlls'

fï wjYH;djhka iïmQ¾K l< mß.Klhla jhs-*hs cd,hla yryd bkag¾fkÜ iu. iïnkaOùfï§ uQ,sl jYfhka isÿjk l%shdj,s folls' mß.Klfha we;s jh¾,ia wevemagrh u.ska o;a; f¾äfhda ;rx. njg yrjd wekagkdj u.ska tajd iïfma%YKh lrhs'

/yeka rys; rjqgrh tu o;a; ,ndf.k tajd mß.Kl o;a; njg wdmiq yrjhs' bkamiq tajd idudkH /yeka Tiafia wka;¾cd,hg iïnkaOflf¾'

fufia bkag¾fkÜ iu. /yekaj,ska iïnkaO jQ rjqgrhl ;sfnk ldurhla ;=, msysgqjkakg mq¿jk' t,suykl msysgqjkakg;a mq¿jka" fldfydu kuq;a fï rjqgrfhka ;rx. iïfma%YKh lrk yd ,nd .kakd n, m%foaYhla ;sfí' fï n, m%foaYfha we;s jhs-*hs iïnkaO;djh ,nd.; yels ;eka fydiaÜfmdÜia ^hotspots& kï fõ' ta lshkafka wevemamrh iys; ,emafgdma tlla /f.k hkafkl= jh¾,ia bkag¾fkÜ iïnkaOh ,nd .kakg kï fujeks jhs-*hs fydiaÜfmdÜ tlg w;=¨‍ úh hq;=h'

jhs-*hs fydÜiafmdÜ tlla isidrd úisÍ me;sÍ ;sfnk f¾äfhda ;rx. cx.u ÿrl:k" fjdalsfgdals" rEmjdysks hka;% hkdÈh yqjudre lrk f¾äfhda ;rx. jqj;a fïjdfha ixLHd;h ta yeugu jvd by,h' ta ksid fïjdg jeä f;dr;=re m%udKhla yqjudre lr.kakg mq¿jk'

jhs-*hs cd,hl§ o;a; yqjudre lrkafka f,dal uÜfuka ;dlaIksl m%ñ;s idok weußldfõ bf,lag%sl,a yd bf,lafg%dksla bxðfkarejkaf.a wdh;kh ^ IEEE - Institute of Electrical and Electronics Engineering & kshuhkag wkqjh' Tjqka ieliQ 802'11 hk cd, m%ñ;sh ^ 802'11 Networking Standard & fuys§ fhod .efka'

fuhska uq,skau bÈßm;a jQfha 802'11b kï m%ñ;shhs' .s.d y¾Üia ^GHz& 2'4l ixLhd; mrdifhka o;a; yqjudre lrk fuys § ;mamrhlg fu.dnhsÜ 11l fõ.fhka f;dr;=re yqjudre lrkakg mq¿jk' 802'11g f,i yÿkajk m%ñ;sh Bg miq wd m%ñ;sh wkqj o .s.dy¾âia 2'4l ixLHd; mrdifhau o;a; iïfma%YKh l,;a tys fõ.h jeäh'
th ;mamrhlg fu.dnhsÜ 54ls'
jhs-*hs cd,hla jev lrk yeá


01& jhs-*hs fydÜiafmdÜ tlla ks¾udKh jk fia f.dvke.s,s j," myka lKqj, yd fjk;a ia:dkj, wekagkd iú lrhs'

02& jhs-*hs cd,hlg fhduq flfrk uQ,sl bkag¾fkÜ iïnkaOh ^ Source Internet connection & we;s fvialafgdma mß.Klh fyda i¾j¾ mß.Klh wekafgkdj iu. /yeka rys;j fyda iys;j iïnkaO flf¾'

03&
oeka iuyr fudnhs,a f*dakaj,g;a mdïfgdma mß.Klj,g;a jhs-*hs ;dlaIKh yÿkd .ekSfï fuj,ï ;sfnk ksid tajd yryd o fï jhs-*hs cd,hg iïnkaO úh yel'

04& ,emafgdma mß.Kl o jhs-*hs ,nd .; yels Wmdx. ^wevemag¾& iu. tk ksid oeka tajdg o fï jhs-*hs cd,hg iïnkaO fjkakg mq¿jk'

802'11 fuys§o fu.dnhsÜ 54l fõ.fhka o;a; yqjudre l< yels Wj;a tys ixLHd; mrdih .s.dy¾Üia 5 ls'


jhs-*hs ;dlaIKfha ;sfnk iqúfYaI;ajh o fu;ek§ lsj yel' tkï jhs-*hs l%ufhka o;a; iïfma%YKh flfrk .s.dy¾âia 2'4 iy 5 hk f¾äfhda ;rx. ixLHd; mrdih ioyd n,m;% ,nd.; hq;= fkdùuhs' fï ksid idudkH f.or fodf¾ jhs-*hs rjqgrhla msysgqjQj;a" Bg;a jvd fikÕlg fiajh .kakg mq¿jka fia k.rhl jhs-*hs wekagkd l=¿Kla bÈ l,;a ixLHd; mrdih fjkqfjka úÿ,s ixfoaY wdh;kj,g nÿ f.úh hq;= ke;'



jhs-*hs ;dlaIKh fhdod f.k bkag¾fkÜ iïnkaOh fyda fjk;a cd, iïnkaO;d fyda ,nd .kakd úg óg wu;r jYfhka ;sfhk jdis o lsysmhls'

01& flan,a fh§fï wjYH;djla ke;s ksid cd,h ia:dms; lsÍu myiqh'

02& fndfyduhla ,emafgdma iu. jhs-*hs wevemag¾ iú fldg ;sîu ksid bkag¾fkÜ iïnkaOh ,nd .ekSug hk uQ,sl úhouo wvqh'

03& jhs-*hs cd,hla ia:dms; fldg mj;ajd f.k hdu wfkla ikaksfõok cd,hkag jvd ,dNodhlh'

04& fï jdisodhl ;;ajhka iys;j jqj;a jhs-*hs ;dlaIKh fhdod .ekSfï hï hï iSudjkao ;sfí' tkï"

05& fï ioyd fhoúh hq;= Yla;sh by, ksid ,emafgdma j, negß ld,h wvqùu yd tys riakh by, hdu isÿfõ'

06& jhs-*hs cd,hla n,mj;ajkafka iSñ; ÿrlgh' .Dyia; jhs-*hs rjqgrhla ksid WmÈk fydÜiafmdÜ tlla wä 150l muK m%foaYhla mqrd n,mj;ajhs' tfiau l=¿Kq wdfY%hka msysgqjk fydÜiafmdÜ tlla jqj;a n, mj;ajkafka wä 300l muK ÿrlgh'

07& jhs-*hs cd,hl ryiH nj wvqh' l=uk jhs-*hs cd,hla fkdñf,a we;s ldg;a myiqfjka iïnkaOúh yels ixLHd; mrdihlska iïfma%YK lghq;a lrk ksid hï cdmhlg msgia;r flfkl= we;=¿ ù f;dr;=re fidhd ne,Su myiqh'

fï ;;ajhka hgf;a jqj;a jhs-*hs ;dlaIKh fydo w;g ÈhqKq lrkakg fkdfhla Wmdh f,dlhd úiska fidhñka isà' k.r jeishka w;rfkdñf,a jh¾,ia bkag¾fkÜ iïnkaOh §u tjekakls' fuys§ uq¿ k.rhu wdjrKh jkfia rjqg¾ moaO;shla msysgqjhs' idudkHfhka ;sfnk rjqgrhlg hdnoj we;s ;j;a rjqgrhla yÿkd.kakg neß jqj;a kd.ßl jhs-*hs cd,hl§ tys we;s yeu rjqgrhlau hdnoj we;s rjqg¾ folla j;a yÿkd.kakg mq¿jkalu ;sfí'

tfiau ta yryd uq¿ k.rfhau we;s rjqg¾ ish,a, tlsfklg iu. iïnkaO flf¾ fufia ;ekQ jhs-*hs cd,hlska  ^Mesh Network & jeiS .;a k.rhl ´kEu ;eklg hkafkl=g lsis lrohla ke;sj ish ,emafgdma tflka bkag¾fkÜ iu. iïnkaO fjkakg mq¿jk'

weußldfõ *s,fv,a*shd" fmkais,afõkshd" *af,daßvd"fglaidia" ksõ fhdla hk m%foaYj, fujeks jhs-*hs cd, ^ Municipal Wi-Fi Network & msysgqjd ;sfí' bka *af,dßvdfõ fikaÜ la,jqâys uyckhdg jhs-*hs bkag¾fkÜ ,efnkafka iïmQ¾Kfhkau fkdñf,ah'

fufia jhs-*hs cd,hlska jeiS .sh k.rhl Odjkh jk fudg¾ r; tlsfklg yÿkd.ekSug mq¿jka fia jhs-*hs ;dlaIKh fhdod .ekSfï jevigykla oeka hqfrdamfha l%shd;aulhs' hqfrdamShka ld¾ gQ ld¾ ^ European Car - 2 - Car& f,i kï fldg ;sfnk fï jevigykg odhl;ajh fokafka hqfrdamfha m%Odk fudag¾ r: ksIamdOk iud.ï yd úYaj úoHd, lSmhls' fuyS§ lrkafka jdykj, jhs-*hs moaO;s msysgqjd tajd w;r iïnkaOh we;s lsÍugh' túg fkdfmfkk jx.=jl§ jqj;a tla fudag¾ r:hlg wfkl yÿkd.kakg mq¿jk'

jhs-*hs ;dlaIKfhka ckhd yÿkd.ekSfï l%uhla *ska ,ka;fha bldfyda ^Ekahua& iud.u yÿkajd § ;sfnkjd" fuh jhs-*hs cd,hlska yÿkd.kakg mq¿jka f¾äfhda ge.a tlls' fuu ge.a ^ Battery Powered RFID Tags & j,g .e,fmk jevigykla ÿjk ,emafgdma tllska fyda geí,Ü mSiS tllska tajd yÿkd .kakg mq¿jk' ÈhqKq rg j, ;sfnk mß.Kl moaO;s fhdod .kakd frday,aj, fyÈhkag" fïjd me,e§ frda.Ska oeka isgkafka fld;koehs oek .ekSu fuu.ska myiqh'

fï úÈyg ÈhqKq rgj,a fndfyduhl mdi,a yd úYaj úoHd, jhs-*hs cd,j,ska fmdfydi;ah' tjeks ;ekl isiqka isákafka l=ku ;ekaj," l=uk f,io lshd yÈishl§ fuu.ska .ek .; yel'

ld¾ tflka ld¾ tlg ikaksfõok l%uh


jdykj, fõ.h" .uka lrk ÈYdj hkdÈh oek .ekSug jdykfha jhs-*hs moaO;shla msysgqúh yelsh'

 oeka fï jdykh bÈßfha we;s ;ekl jÈkakg hkjd kï Bg l,ska ta ndOlh yÿkd f.k t,dï yvjd ta nj ßhÿrdg lshhs'jdyk folla uqKg uQk yuqfjkakg l,ska jhs-*hs moaO;s tlsfkldg uqK .eiS bÈßhg jdykhla tk  nj lshhs' fufia f,dl= m%foaYhl fuh me;sß we;s ksid jhs-*hs f.dvla m%fhdackhg .; yel'

,smsh È. jeäùu .ek lK.dgqjk kuq;a ish,a, lshùfuka Tng jeä oekqula ,nd .; yel'

fuu jákd ,smsh ,sõfõ wfYaka pdkl

 
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