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1 - ГрандСервис. Телекоммуникационное оборудование

1 - ГрандСервис. Телекоммуникационное оборудование

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Clheujq cnjhjys> yjdst ctnb gthtlfxb lfyys[gjrf tot yt j,tcgtxbdf/n 'aatrnbdyjqgthtlfxb nhfabrf nhflbwbjyyjq ntktajybbbkb cbcntv dbltjdtofybz d htfkmyjvdhtvtyb.D ,jkmibycndt ckexftd jgthfnjhs ghjljk;f/njgbhfnmcz yf cdj/ hfpdbne/ byahfcnherneheSDH#SONET lkz gthtlfxb nhfabrf d ghtltkf[ujhjlcrb[ ctntq !metropolitan area network> MAN@.Ctnb SDH#SONET j,kflf/n hzljv ,tccgjhys[ljcnjbycnd% rj'aabwbtyn ujnjdyjcnb lj 99.999fi&ghfrnbxtcrb gjdctvtcnysq j[dfn d ghtltkf[vtufgjkbcjd b d ukj,fkmyjv vfcinf,t&jgnbvfkmyst [fhfrnthbcnbrb lkz gthtlfxb ujkjcfb nhfabrf ceotcnde/ob[ rhbnbxtcrb df;ys[ghbkj;tybq. Gj 'njq ghbxbyt vyjubt jgthfnjhscdzpb ghbkfuf/n ecbkbz r njve> xnj,s bcgjkmpjdfnmcdj/ byahfcnhernehe SDH#SONET lkz ghjphfxyjqgthtlfxb nhfabrf KDC b ljcnegf r ctnzvgjcnfdobrjd eckeu.C lheujq cnjhjys> yfxfkjcm cjplfybt ujhjlcrb[rjktw Ethernet> jgnbvbpbhjdfyys[ lkz ljcnfdrbdscjrjcrjhjcnys[ lfyys[ rjytxysvgjkmpjdfntkzv. Gjlrk/xtybt gjkmpjdfntktq r 'nbvrjkmwfv jceotcndkztncz d jcyjdyjv gjjgnjdjkjrjyyjq bkb ,tcghjdjlyjq byahfcnhernehtc bynthatqcfvb Fast Ethernet b Gigabit Ethernet yfgkjoflrt gjkmpjdfntkz.Ghjphfxyfz gthtlfxf nhfabrf KDCRjytxyst gjkmpjdfntkb ye;lf/ncz d ghjcnjv>ytljhjujv htitybb lkz gthtlfxb rjhgjhfnbdys[lfyys[ b nhfabrf KDC vt;le hfpkbxysvbvtcnysvb b htubjyfkmysvb jabcfvb gjchtlcndjvdscjrjcrjhjcnyjq ctnb. Jgnbvfkmysv ds[jljv lkzyb[ ,skj ,s j,tcgtxbnm hf,jne dct[ KDC rfrtlbyjq kjrfkmyjq ctnb> yfkj;tyyjq ghjphfxysvj,hfpjv yf ctnm jgthfnjhf cdzpb b bp,fdktyyjq jnckj;yjcnb b ljhjujdbpys ukj,fkmys[ ctntq. Njxyjnfr ;t b jgthfnjhs cdzpb pfbynthtcjdfys dgjcnhjtybb nfrb[ $ukj,fkmys[$ KDC yf jcyjdtcdjtq ceotcnde/otq jgnjdjkjrjyyjq brjfrcbfkmyjq byahfcnhernehs T1#N1>T3#N3 b STM-1#OC-3.Ljcneg r ctnzv gjcnfdobrjd eckeuGjcnfdobrb eckeu Bynthytn !ISP@ b eckeughbkj;tybq !ASP@ ljk;ys eljdktndjhznmnht,jdfybz cdjb[ rjhgjhfnbdys[rkbtynjd gj ekexityb/ j,cke;bdfybz bgjdsityb/ crjhjcnb ljcnegf d Bynthytn.:tcnrfz rjyrehtywbz d 'njq j,kfcnbpfcnfdkztn b[ ,jktt fuhtccbdyj dytlhznmyjdst gfrtns eckeu b hfcibhznmnthhbnjhbfkmysq j[dfn cdjb[ ctntq. D nj;t dhtvz hflb cyb;tybz'rcgkefnfwbjyys[ hfc[jljd b gjdsitybzghb,skmyjcnb> ISP b ASP dsye;ltys ddjphfcnf/otq cntgtyb djpkfufnmgthtlfxe nhfabrf cdjb[ rkbtynjd yfcbcntvs ljcnegf b jgjhyst ctnb>ghbyflkt;fobt lheubv jgthfnjhfvcdzpb. Dj vyjub[ ckexfz[ 'nb ctnbbcgjkmpe/n nt[yjkjub/ SDH#SONET.Fyfkjubxyfz cbnefwbz yf,k/lftncz b drhegys[ rjhgjhfwbz[> ghtljcnfdkz/ob[eckeub gthtlfxb lfyys[ cdjbv abkbfkfv.Pflfxf jgthfnjhjd ctntq SDH#SONETcjcnjbn d njv> xnj,s j,tcgtxbnmgthtlfxe 'nb[ cgtwbfkbpbhjdfyys[ nbgjdlfyys[> d njv xbckt cdjb[ cj,cndtyys[lfyys[ vt;le epkfvb ljcnegf b[hfybkbofvb lfyys[> ,tp gjcnhjtybzjnltkmyjq nhfycgjhnyjq ctnb Ethernet.Ghtj,hfpjdfybt vt;le Ethernet bSDH#SONETYfb,jktt ghjcnjt b 'rjyjvbxyjthtitybt lkz gthtlfxb nhfabrf Ethernetgj nhfycgjhnyjq ctnb SDH#SONET cjcnjbnd bcgjkmpjdfybb rjvgfrnys[ghtj,hfpjdfntktq bynthatqcjd. "nbytljhjubt b ghjcnst ecnhjqcndfj,tcgtxbdf/n cjtlbytybt vt;le KDC bctnm/ ljcnegf> d njv xbckt cbcgjkmpjdfybtv dsltktyys[ kbybq. RADghtlkfuftn gjkysq yf,jhghtj,hfpjdfntktq 10#100BaseT Ethernet dSDH#SONET> jn T1#N1 lj T3#N3 bSTM-1#OC-3.Ctnm Ethernet yf $gjcktlytq vbkt$Ctntdst jrjytxyst ecnhjqcndf Ethernetghjbpdjlcndf RAD !E-NTU@ gjpdjkz/njgthfnjhfv jhufybpjdfnm f,jytyncrbqljcneg gj Ethernet. "nbcgtwbfkbpbhjdfyyst> eghfdkztvstecnhjqcndf cke;fn lkz hfpuhfybxtybzctnb gjkmpjdfntkz b ctnb gjcnfdobrfeckeu. Jyb gjllth;bdf/n aeyrwbbeghfdktybz> nfrbt> rfr juhfybxtybtcrjhjcnb gthtlfxb> b jceotcndkz/nlbaathtywbfwb/ eckeu yf jcyjdt ntujdbkb rfcrflbhjdfybz DKDC. Gjllth;rfDKDC gjpdjkztn jgthfnjhfv dsltkznmnhfabr rf;ljuj gjkmpjdfntkz bghtlkfufnm nfrbt eckeub> rfr j,(tlbytybtKDC vt;le hfpkbxysvb rjhgjhfnbdysvbjabcfvb> ljcneg d Bynthytn bpfobotyyst dbhnefkmyst xfcnyst ctnb.Nfrjq gjl[jl hfcibhztn pjye dkbzybzjgthfnjhf gj jgnjdjkjrjyyjqbyahfcnherneht> j,ktuxfz crdjpyjteghfdktybt lbaathtywbbhjdfyysvbeckeufvb dgkjnm lj gkjoflrbgjkmpjdfntkz.Rhjvt njuj> dytlhtybt E-NTU cjplftnnt[ybxtcre/ b 'rjyjvbxtcre/ ,fpe lkzcjplfybz ctntq ljcnegf Ethernet>yfkj;tyys[ yf ceotcnde/oe/byahfcnhernehe SDH/SONET bkb ATM.Hfpdbdf/obtcz cnfylfhns yjdjujgjrjktybz SDH/SONET> nfrbt> rfr GFP>VCAT b LCAS> hfdyj rfr b ceotcnde/obtvt[fybpvs jnj,hf;tybz ATM> gjpdjkz/n'aatrnbdyj gthtlfdfnm nhfabr Ethernetyf jcyjdt nhflbwbjyys[ gkfnajhv cgjvjom/ E-NTU> hfcgjkj;tyys[ yfgkjoflrf[ gjkmpjdfntktq. Cjplfybtgjlj,ys[ ctntq ljcnegf Ethernet lftnytcrjkmrj ghtbveotcnd. 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ByahfcnhernehfSDH ghtljcnfdkztn cfvsq yflt;ysq b,tpjgfcysq cgjcj, gthtlfxbbyajhvfwbb lkz [hfytybz yf ,jkmibthfccnjzybz. Ghtj,hfpjdfntkbFibre Channel d SDH/SONET gjpdjkz/n'rjyjvbxysv b yflt;ysv cgjcj,jvcjtltybnm ldf hfpytctyys[ [hfybkboflfyys[. RAD ghtlkfuftn htitybt FCoSDHyf 155#622 V,bn#c.DDTLTYBT D ETHERNET B HTITYBZ LJCNEGF R {HFYBKBOFV LFYYS{RAD Data Communications 2005 Rfnfkju113

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