Cov chaw zov me nyuam, cov chaw lag luam, thiab cov kev ua tau zoo hauv kev ua haujlwm siab xav tau hloov pauv tau thiab txhais tau zoo 50G, 100G, 200G, thiab 400G cables rau kev sib txuas hauv thiab nruab nrab ntawm racks. Nrog rau txoj kev loj hlob ntawm 400G thev naus laus zis, 400G direct-connect cables haum rau luv luv cov ntaub ntawv chaw interconnection tau loj tsim thiab ua lag luam, suav nrog400 G DACthiab 400G AOC.
Tam sim no ntawm kev ua lag luam, 400G DAC thiab 400G AOC feem ntau muaj ob hom ntim: QSFP-DD thiab OSFP, ob qho tib si txais yuav 8 × 50Gb / s PAM4 hluav taws xob hloov kho hom. Ntxiv rau 400G direct-connect cable, muaj 400G DAC high-ceev ceg cables thiab 400G AOC active ceg cables, nrog ib tug 400G connector ntawm ib kawg thiab ob peb connectors ntawm tus nqi qis ntawm lwm yam kawg (rau tag nrho tus nqi. 400 g).
Qhov sib txawv loj tshaj ntawm400 G DACthiab 400G AOC yog nyob rau hauv qhov sib txawv ntawm kev sib kis deb. Qhov kev ncua deb ntawm 400G DAC tuaj yeem txhawb nqa 3m nkaus xwb, thaum qhov kev sib kis ntawm 400G AOC tuaj yeem txhawb nqa 70m (OM3) lossis 100m (OM4). Qhov no yog vim lawv siv cov xov xwm sib txawv. 400G DAC SIV tooj liab cable ua qhov nruab nrab kis tau tus mob, thaum 400G AOC siv fiber ntau optical raws li qhov nruab nrab kis tau tus mob. Tsis tas li ntawd, 400G DAC thiab 400G AOC muaj qhov sib txawv hauv qab no:
• Muaj hom -- Raws li qhov kev lag luam tam sim no, muaj ntau hom 400G DAC, thaum 400G AOC active ceg cable thiab QSFP-DD conversion 4 * 100G QSFP AOC tsis tau nkag mus rau hauv kev ua lag luam rau lub sijhawm tam sim no. Yog li ntawd, 400G DAC tuaj yeem ua tau raws li qhov xav tau kev sib txuas ntxiv.
• Volume thiab hnyav -- Optical fiber yog me thiab sib zog dua tooj liab tub ntxhais, yog li 400G AOC yog me me thiab sib dua 400G DAC. Lub 400G AOC yog ib nrab ntawm qhov loj ntawm 400G DAC, thiab hnyav tsuas yog ib lub hlis twg ntau npaum li cas. Tsis tas li ntawd, lub vojvoog dabtsi yog khoov ntawm 400G AOC tsawg dua 400G DAC.
• Kev muaj peev xwm tiv thaiv kev cuam tshuam -- raws li cov tub ntxhais ntawm 400G AOC yog cov khoom siv kho qhov muag, uas yog cov khoom siv insulating thiab tsis muaj kev cuam tshuam, nws tsis yooj yim rau electromagnetic, xob laim lossis xov tooj cua thaum lub sijhawm xa cov ntaub ntawv; Tab sis 400G DAC cable yog tooj liab tub ntxhais, yuav ua hluav taws xob, thiab yog li ntawd muaj kev cuam tshuam rau xob laim thiab lwm yam cuam tshuam.
• Nqe -- Txij li thaum tus nqi ntawm optical fiber feem ntau yog siab dua li ntawm cov tooj liab cable, tus nqi ntawm 400G AOC feem ntau yog siab dua li ntawm 400G DAC (yuav tsum tau ua ntej: tib theem lossis pob). Yog tias qhov kev sib kis ntawm 400G DAC tuaj yeem ua tau raws li koj qhov kev xav tau hauv network, nws tau qhia tias koj tuaj yeem xaiv 400G DAC ua ntej, uas tuaj yeem txuag tau cov nqi.
Saib rau yav tom ntej
Ob leeg 400G DAC thiab 400G AOC yog cov kev daws teeb meem zoo tshaj plaws rau kev sib txuas hauv lossis nruab nrab ntawm racks, tab sis rau kev sib kis ntau dua 100 meters, nws yog qhov zoo tshaj plaws los siv 400G optical module nrog cov fiber ntau sib xws (xws li MTP{{5} } fiber ntau jumper). Nrog rau kev lag luam thiab teev ntawm 400G Ethernet, 400G QSFP-DD optical module thiab 400G OSFP optical module tau nkag mus rau hauv kev ua lag luam thiab pib ntau lawm.
Lus nug txog400G DAC/AOC
Q: Vim li cas 400G DAC / AOC txais PAM4 kev hloov kho?
A: Piv nrog NRZ kev hloov kho, PAM4 yog cov txheej txheem kev hloov kho tau zoo dua, uas tuaj yeem txhim kho kev siv bandwidth zoo. Nyob rau tib lub baud tus nqi, PAM4 muaj ob zaug qhov hnoos thiab nqus tau ntawm NRZ. Hauv lwm lo lus, PAM4 tuaj yeem ua kom lub network bandwidth tsis ntxiv cov fibers optical ntxiv, yog li txhim kho kev siv bandwidth.
Q: Dab tsi yog cov thev naus laus zis tseem ceeb ntawm 400G DAC / AOC?
A: Cov thev naus laus zis tseem ceeb ntawm 400G DAC / AOC yog PAM4 thiab DSP. Txij li thaum PAM4 muaj kev cuam tshuam rau lub suab nrov dua NRZ, tshwj xeeb tshaj yog nyob rau hauv 400G AOC, DSP tau qhia los them rau qhov tsis txaus ntawm PAM4. Raws li cov txheej txheem digital ceev ceev, DSP tuaj yeem tsis tsuas yog muab lub moos digital rov ua haujlwm (Tshaj tawm los ntawm CDR), tab sis kuj ua haujlwm cuam tshuam kev cuam tshuam kom tshem tawm suab nrov, tsis muaj kab thiab lwm yam cuam tshuam.
