QSFP, QSFP28 thiab QSFP56 tau sib xyaw tas li vim lawv sib koom tib lub compact, plaub - txoj kab pluggable zoo. Lawv tsis yog, txawm li cas los xij, tib tiam ntawm transceiver. Txoj kev ceev tshaj plaws kom lawv ncaj yog los ntawm Ethernet ceev:QSFP + yog tsim rau 40G, QSFP28 rau 100G, thiab QSFP56 rau 200G.Txhua yam uas ua rau tib neeg mus tom qab - chaw nres nkoj txhawb nqa, kev taw qhia, kev tawg, FEC thiab tus cwj pwm thermal - ua raws li qhov ntawd.
Ib daim ntawv teev npe ua ntej peb pib, vim tias nws ua rau muaj qhov yuam kev tiag tiag. Hauv phau ntawv qhia no, thaum peb sau "QSFP" ntawm nws tus kheej peb txhais tau tias thawj 40G tiam uas kev lag luam feem ntau sau npeQSFP +. Lub ntsiab lus dawb "QSFP" kuj tseem siv xoob rau tag nrho tsev neeg, yog li cov kab uas tsuas yog hais tias "QSFP optic" qhia koj yuav luag tsis muaj dab tsi txog nws qhov ceev. Peb rov qab los rau qhov no hauv ntu tom ntej.
Yog tias koj tab tom txiav txim siab hloov kho lossis yuav optics rau qhov hloov pauv tshwj xeeb, tsis txhob xaiv ntawm cov duab module. QSFP28 module poob huv si rau hauv 40G tawb thiab tseem yuav tsis txuas, vim qhov hloov chaw nres nkoj - tsis yog lub transceiver - txiav txim siab qhov hluav taws xob interface, cov ntaub ntawv tus nqi thiab firmware tus cwj pwm uas qhov txuas tau khiav ntawm.
QSFP + vs QSFP28 vs QSFP56
| Yam ntxwv | QSFP + | QSFP28 | QSFP56 |
|---|---|---|---|
| Hom Ethernet ceev | 40G | 100G | 200G |
| Lane architecture | 4 × 10G | 4 × 25G | 4 × 50G |
| Kev taw qhia (modulation) | NRZ | NRZ | PAM 4 |
| Common optical variants | SR4, LR4 | SR4, DR, FR/CWDM4, PSM4, LR4 | SR4, FR4, LR4, DR 4 |
| Hom connectors | MPO / MTP (SR4), duplex LC (LR4) | MPO/MTP (SR4, PSM4), duplex LC (FR/LR4/DR) | MPO / MTP (SR4, DR4), duplex LC (FR4 / LR4) |
| FEC kev vam meej | Tsis muaj rau 40G NRZ | Tsis muaj lossis xaiv tau ntawm feem ntau NRZ optics | RS- yuav tsum tau FEC (PAM4) |
| Tej yam tawg | 4 × 10G SFP + | 4 × 25G SFP28 | 4 × 50G SFP56 |
| Qhov twg nws haum | Legacy 40G, 10G → 40G migration, labs | 100G nplooj- qaum, 25G server aggregation | 200G txha nraub qaum, 50G neeg rau zaub mov, siab - sib sau ua ke |
| Ib txwm hloov kho txoj kev | → 100G QSFP28 | → 200G QSFP56 los yog 400G QSFP-DD | → 400G QSFP-DD / OSFP |
| Kev txwv loj | Bandwidth qab nthab rau cov ntaub ntom ntom | Tsis yog 200G daws | Xav tau PAM4 ports, RS-FEC thiab thermal headroom |
QSFP vs QSFP +: Puas yog Lawv Ib Leeg?
Qhov no yog lo lus nug uas derails xaj ntau dua li qhov teeb meem kev sib raug zoo. Cov lus teb luv luv:QSFP yog ib tsev neeg; QSFP + yog ib tug tswv cuab ntawm nws.
QSFP stands rau Quad Small Form-factor Pluggable. "Quad" yog plaub - txoj kab tsim uas txhua tiam neeg khaws; dab tsi hloov ntawm ib tiam mus rau lwm tiam yog qhov ceev ntawm txhua txoj kab. QSFP + yog thawj tus tswv cuab dav dav, nqa plaub 10G kab rau 40G Ethernet. Vim tias nws tuaj txog ua ntej, "QSFP" thiab "QSFP +" tau hloov pauv tau hauv cov ntaub ntawv, xaj xaj thiab hloov CLIs, thiab tus cwj pwm ntawd daig txawm tias tom qab 100G thiab 200G tiam tshwm sim.
Yog li thaum koj pom "QSFP" tsis muaj tus lej, kho nws tsis meej thiab daws nws ua ntej koj yuav: 40G QSFP + optic thiab 100G QSFP28 optic zoo tib yam hauv lub tais tab sis tsis hloov pauv hauv qhov chaw nres nkoj. Lub hnab ntawv tshuab, I²C tswj interface thiab SFF-8636 nco daim ntawv qhia tau muab faib thoob plaws QSFP/QSFP28 tsev neeg, uas yog vim li cas ob qho tib si optics tuaj yeem tsis meej pem ntawm qhov pom. Ib daim ntawv qhia ceev uas tuav hauv kev xyaum:
- QSFP +- 40G, plaub 10G NRZ txoj kab.
- QSFP28- 100G, plaub 25G-class NRZ kab.
- QSFP56- 200G, plaub 50G-chav kawm PAM4 kab.
-
Qhov sib txawv ntawm Core: Txoj kab nrawm thiab teeb liab
Tag nrho tsev neeg ntsuas tib txoj kev: khaws plaub txoj kab, thawb ntau me ntsis hauv ib qho. Txhua qib ceev yog txhais los ntawm tusIEEE 802.3 Ethernet qauv, uas yog vim li cas ib qho kev ua raws li optic los ntawm ib tus neeg muag khoom cuam tshuam nrog qhov chaw nres nkoj ua raws los ntawm lwm qhov.
QSFP +: plaub txoj kab 10G (40G)
Ib qho 40G QSFP + SR4 module khiav plaub xa mus thiab plaub txoj kab tau txais kev sib txuas ntau hom fiber ntau, feem ntau raug txiav hauv MPO / MTP connector; ib zaug -mode LR4 variant multiplexes plaub wavelengths mus rau duplex LC khub rau 10 km ncav cuag. QSFP+ tseem khwv tau nws qhov chaw hauv keeb kwm yav dhau los 40G cores, xeem lub rooj zaum thiab tus nqi - qhov sib txuas tseem ceeb. Nws nres ua qhov kev txiav txim siab thaum lub sijhawm koj tus neeg rau zaub mov nkag mus rau 25G lossis 50G, vim tias qhov chaw nres nkoj 40G dhau los ua lub fwj tsis yog qhov optic.
QSFP28: plaub txoj kab 25G (100G)
QSFP28 khaws plaub- txoj kab layout tab sis nce txhua txoj kab mus rau 25G-chav kawm NRZ, uas yog qhov ua rau nws ua haujlwm ntawm 100G nplooj- qaum ntaub. Ib qho chaw QSFP28 ib leeg nqa 100G, thiab ntawm cov keyboards uas nthuav tawm hom nws faib ua plaub 25G SFP28 txuas - qhov kev sib tw huv rau racks tag nrho ntawm 25G servers pub 100G uplinks. Nws cov ecosystem sib sib zog nqus (SR4, DR, FR, CWDM4, PSM4, LR4, ntxiv rau DAC thiab AOC), uas yog ib feem ntawm vim li cas nws thiaj li muaj kev nyab xeeb rau 100G tsim tshiab.
QSFP56: plaub 50G PAM4 txoj kab (200G)
QSFP56 muab ob npaug rau qhov chaw nres nkoj dua rau 200G los ntawm kev khiav plaub txoj kab 50G, thiab kom haum 50G rau hauv txoj kab nws hloov ntawm NRZ mus rau PAM4 teeb liab. NRZ xa ib me ntsis rau ib lub cim siv ob theem; PAM4 xa ob lub cim rau ib lub cim siv plaub theem. Qhov ntawd ntim cov ntaub ntawv ntau dua rau hauv tib qhov baud tus nqi, tab sis plaub theem zaum ze dua ua ke, yog li qhov txuas tsis tshua muaj siab ntev ntawm lub suab nrov, kev xav thiab cov channel marginal. Qhov ua tau zoo yog tias QSFP56 tsis yog "QSFP28 sai dua" - nws yog cov khoom siv hluav taws xob sib txawv, thiab nws cia siab tias qhov chaw nres nkoj, firmware thiab txuas tus khub tsim los rau PAM4.
NRZ vs PAM4: Vim Li Cas Nws Hloov Kho Engineering
Kev dhia mus rau PAM4 yog ib qho laj thawj loj tshaj plaws QSFP56 kev xa tawm tsis ua haujlwm hauv QSFP28 kev xa tawm tsis tau. Nrog NRZ, tus txais tsuas yog txiav txim siab ntawm ob lub xeev, yog li lub qhov muag yog dav thiab cov npoo tau zam txim. Nrog PAM4, tus txais yuav tsum tau cais plaub lub xeev nyob rau hauv tib lub qhov rais voltage, uas shrinks txhua lub qhov muag mus rau kwv yees li ib feem peb ntawm qhov siab thiab ua rau cov kev sib txuas lean nyuaj rau DSP thiab pem hauv ntej kev ua yuam kev.
Tias yog vim li cas FEC nres yog xaiv tau . 50G-ib - txoj kab PAM4 yog tus qauv hauvIEEE 802.3 cd, uas txib RS-FEC rau cov kev sib tshuam no; kev kho qhov yuam kev yog ib feem ntawm qhov txuas tau tsim los kaw, tsis yog lub pob qhov rooj uas koj tuaj yeem tua. Kho qhov txuas 200G raws li qhov system uas lub optic, tus tswv SerDes thiab FEC teeb tsa txhua tus yuav tsum pom zoo.
Ib qho piv txwv teb.Nyob rau hauv ib lub qhov rais txij nkawm, 200G txuas tuaj huv si ntawm ob qho kawg thiab dhau qhov kev xeem ping ceev, yog li nws tau kos npe tawm. Teev tom qab, saib xyuas tus chij nce toj ncej-FEC yuam kev thiab poob qis. Qhov laj thawj yog FEC tsis sib haum: ib sab muaj RS-FEC tau qhib, lwm qhov tau txais qhov profile uas ua rau nws xiam. Qhov txuas "ua haujlwm" tsuas yog ntev txaus los nkaum qhov teeb meem. Qhov kho tsis tseem ceeb; zaj lus qhia yog tias ntawm PAM4 koj paub meej tias hom FECua ntejkoj kaw qhov kev hloov pauv, vim tias qhov txuas uas ci ntsa iab tsis zoo ib yam li qhov txuas uas muaj kev noj qab haus huv.
Compatibility: Koj puas tuaj yeem sib xyaw QSFP +, QSFP28 thiab QSFP56?
Qhov no yog qhov uas feem ntau cov nyiaj tiag yog nkim. Cov modules yog mechanically interchangeable; cov chaw nres nkoj tsis yog. Txoj cai uas piav txog yuav luag txhua rooj plaub yog qhov yooj yim:
Qhov siab dua - qhov chaw nres nkoj ceev feem ntau tuaj yeem tsav qis dua - module ceev, tab sis qis dua - qhov chaw nres nkoj ceev tsis tuaj yeem tsav siab dua - module nrawm tshwj tsis yog tus neeg muag khoom qhia meej meej rau nws.
QSFP + module hauv QSFP28 chaw nres nkoj?
Feem ntau yog - thaum qhov hloov pauv cia koj teeb qhov chaw nres nkoj rau 40G hom. Lub 100G SerDes tuaj yeem teeb tsa mus rau 40G hluav taws xob profile ib QSFP + optic xav tau, uas yog qhov ua rau phased 40G → 100G migrations tswv yim ntawm tib lub kho vajtse. Qhov kev ntes yog tias qhov chaw nres nkoj yuav tsum tshaj tawm qis dua - hom ceev hauv nws cov kev txhawb nqa - cov npe optics; mechanical haum tsis zoo ib yam li hom kev tshaj tawm.
QSFP28 module hauv QSFP + chaw nres nkoj?
Tsis yog. QSFP + chaw nres nkoj tsuas yog muab 40G-chav kawm hluav taws xob interface, thiab tsis muaj txoj hauv kev rau nws mus rau qhov chaw 25G-ib - txoj kab qhia 100G optic xav tau. Lub rooj zaum ntawm module thiab tej zaum yuav txawm nyeem nws EEPROM, tab sis qhov txuas tsis tuaj yeem sib tham txog 100G - tus tswv tsev tsuas yog tsis muaj txoj kab los pub rau nws. Cia siab tias nws pib-kev sib tham los txuas qhov sib txawv yog qhov yuam kev classic: 100G QSFP28 SR4 poob rau hauv 40G- tsuas yog tawb nyob hauv qhov tsaus ntuj txawm tias qhov chaw nres nkoj tau teeb tsa li cas.
QSFP56 module hauv QSFP28 chaw nres nkoj?
Tsis yog. QSFP56 xav tau 50G PAM4- txoj kab muaj peev xwm; QSFP28 chaw nres nkoj yog tsim rau 100G NRZ thiab tsis muaj tus nqi ntawm ib txoj kab lossis PAM4 datapath los khiav 200G optic. Tsis muaj qhov teeb tsa software uas hloov 100G NRZ chaw nres nkoj rau hauv 200G PAM4 chaw nres nkoj.
QSFP56 chaw nres nkoj puas tuaj yeem khiav cov qauv qub?
Feem ntau, tab sis tsuas yog los ntawm kev tsim. Ntau 200G platforms nthuav tawm 100G QSFP28 thiab 40G QSFP + hom ntawm tib lub tawb kom cov neeg ua haujlwm tuaj yeem ua qhov kev hloov kho tshiab, tab sis qhov kev ua haujlwm rov qab yog cov cuab yeej ntawm kev hloov ASIC thiab nws cov software, tsis yog ntawm QSFP56 tawb nws tus kheej. Qhov kev ntsuam xyuas yog seb qhov optic tshwm nyob rau hauv tus neeg muag khoom cov npe txhawb rau lub platform thiab hom - yog tias nws tsis yog, xav tias nws tsis muaj kev txhawb nqa.
Breakout Compatibility
Breakout yog qhov thib ob, cais qhov sib txuas ntawm kev tuag, vim nws nyob ntawm hom chaw nres nkojthiablub operating system, tsis yog lub cable. Txhua tiam neeg tawg tawm hauv nws txoj kab ceev:
- QSFP+ - 40G rau 4 × 10G SFP+.
- QSFP28 - 100G rau 4 × 25G SFP28.
- QSFP56 - 200G rau 4 × 50G SFP56.
Cov khoom sib txuas zoo li paub thoob plaws ntau tiam neeg, uas yog qhov tseeb ntawm qhov ntxiab: 40G-rau-4 × 10G sib dhos tsis zoo ib yam li 100G-rau-4 × 25G sib dhos, txawm tias ob qho tib si xaus tib txoj kev. Ib qho kev sib txuas tsis ua haujlwm thaum lub chaw nres nkoj niam txiv tsis tau muab tso rau hauv kev sib cais, thaum OS duab tsis nthuav tawm qhov kev cais tshwj xeeb, lossis thaum qhov kawg tsis tuaj yeem khiav lub hom phiaj txoj kab nqi - thiab qhov txuas uas yog ib nrab ntawm plaub txoj kab yog qhov nyuaj rau kev kuaj mob dua li ib qho uas tsis tau tuaj txog. Ua ntej kev txiav txim, phim lub rooj sib txoos rau qhov chaw nres nkoj ceev thiab paub meej tias lub platform txhawb qhov sib cais. Thaum parallel optics pub lub breakout, sab fiber ntau yog tsim los ntawmMTP / MPO breakout cablessized rau txoj kab suav.
Cabling thiab ncav cuag: SR4, LR4, FR4, DR4, DAC thiab AOC
Lub module tiam tsuas yog ib nrab ntawm kev txiav txim siab; qhov txuas nrug, hom fiber ntau thiab connector yog lwm ib nrab. Kev ncav cuag cov duab hauv qab no yog qhov tseem ceeb uas tau teev tseg los ntawm IEEE 802.3 rau qhov sib txawv - qhov kev ncua deb ib txwm nyob ntawm qib fiber ntau thiab qhov tshwj xeeb optic.
| Tiam | Kev ncav cuag luv (multimode) | Ntev ncav cuag (ib zaug -mode) | Hom connectors |
|---|---|---|---|
| QSFP+ 40G | SR4: mus txog ~ 100 m OM3 / ~ 150 m OM4 | LR4: mus txog 10 km | MPO/MTP (SR4); Duplex LC (LR4) |
| QSFP28 100G | SR4: mus txog ~ 70 m OM3 / ~ 100 m OM4 | DR: ~ 500 m; FR/CWDM4: ~ 2 km; 4 :10km | MPO/MTP (SR4, PSM4); Duplex LC (DR/FR/LR4) |
| QSFP56 200G | SR4: mus txog ~ 100m OM4 | DR4: ~ 500 m; FR4: ~ 2 km; 4 :10km | MPO/MTP (SR4, DR4); Duplex LC (FR4 / LR4) |
Luv - mus txog qhov txuas multimode
Hauv ib kab lossis hla ib chav, SR4 optics hla kev sib txuam multimode yog lub neej ntawd. Tag nrho peb tiam 'SR4 variants khiav ntawm MPO / MTP txiav fiber ntau, yog li cov cabling uas pub rau lawv feem ntau ua los ntawmMPO / MTP thaj cordsnrog rau qhov tseeb polarity thiab txoj kab kev qhia.
Mus txog yog qhov twg multimode tom: txav los ntawm 40G mus rau 100G ntawm tib lub OM3 cabling ua kom luv qhov kev txhawb nqa, thiab 200G tseem nruj dua. Yog tias koj rov siv cov pob tw uas twb muaj lawm, paub meej tias qib fiber ntau tiv thaiv optic tus spec ua ntej koj cog lus - peb lub ntsiab lus ntawmOM3 thiab OM4 nrug txwvnteg tawm qhov twg txhua qib saum toj kawg nkaus.
Tib -mode links
Rau kev tsav tsheb ntev dua, LR4, FR4, DR4, CWDM4 thiab PSM4 npog qhov sib txawv thiab kev lag luam architecture-offs. WDM variants (FR4, LR4, CWDM4) tawg plaub wavelengths mus rau ib tug duplex khub, yog li ntawd lawv txiav nyob rau hauvDuplex LC connectors; sib npaug tib yam -mode variants (DR4, PSM4) khaws cov fibers cais ib txoj kab thiab siv MPO/MTP hloov.
Lub fiber nws tus kheej tseem ceeb npaum li qhov optic nyob deb. Tib - hom nroj tsuag feem ntau yogOS 2 fiberrau sab nraud- tsob nroj thiab ntev lub tsev kawm ntawv khiav, thiab sib piv cov fiber ntau rau cov optic qhov peev xwm ncav cuag yog dab tsi khaws 10 km txuas hauv spec.
DAC thiab AOC txuas
Rau hauv - khib lossis nyob ib sab - khib hops, ncaj qha - txuas tooj liab (DAC) thiab active optical cable (AOC) feem ntau pheej yig dua thiab yooj yim dua cais optics ntxiv rau jumpers. DAC yog qhov qis tshaj - tus nqi kev xaiv rau luv luv tooj liab khiav; AOC yog sib dua thiab ncav cuag deb dua li cov tooj liab passive. Ntawm 50G- toj ib- txoj kab PAM4, ntev tooj liab thiab cov teeb liab zoo tau txais kev zam txim sai, yog li lub DAC passive uas zoo ntawm 25G yuav tsis nyob ntawm 50G - loj tooj liab ntev conservatively ntawm tus nqi siab dua.
Fais fab, FEC thiab Thermal Planning
Txoj kab nrawm dua yuav tsum tau ua cov teeb liab ntau dua, thiab qhov kev ua haujlwm ntawd tshwm sim thaum tshav kub. Raws li cov lus qhia ntxhib, 40G QSFP + optics feem ntau zaum hauv ~ 1.5–3.5 W ntau yam, 100G QSFP28 ncig 3.5–5 W, thiab 200G QSFP56 nquag 5–7 W lossis ntau dua nyob ntawm qhov sib txawv. Koj tsis tas yuav twv: txhua qhov module tshaj tawm nws kos los ntawm qhovSFF-8636 chav kawm fais fabtswj los ntawm SNIA SFF pawg thawj coj, thiab qhov kev hloov pauv tswj cov chav kawm siab tshaj plaws rau ib lub tawb.
Rau -chaw nres nkoj uas suab tsis muaj teeb meem; ntawm scale nws tsis yog. Ib qho 2 W nce rau ib qhov chaw nres nkoj hla 32-chaw nres nkoj 1RU hloov ntxiv roughly 64 W ntawm optical tshav kub rau lub chassis uas twb thermally nruj, thiab ib tug tag nrho cov neeg nyob rau hauv 64-chaw nres nkoj box doubles uas. Qhov ntawd yog qhov txaus los thawb ntug cov chaw nres nkoj dhau los ntawm lawv qhov ntsuas kub yog tias qhov kev taw qhia airflow tsis ncaj ncees lawm lossis cov tawb uas nyob ib sab tseem khiav kub optics.
Ib qho piv txwv teb.Ib qhov ntom ntom saum toj kawg nkaus - ntawm - khib hloov tau populated nrog siab - lub zog ntev - ncav cuag optics hauv txhua qhov chaw nres nkoj. Cov kev sib txuas tau noj qab nyob zoo, tab sis nyob rau hauv ib hnub lub chassis tau kaw lub tswb ntsuas kub ntawm lub tawb ze tshaj qhov sov - cua tso pa. Tsis muaj ib yam dab tsi tsis zoo - cov khib nyiab airflow thiab qhov hloov pauv ntawm -chaw nres nkoj thermal peev tsuas yog tsis tau npaj rau qhov sib xyaw ntawm optic. Cov ntawv teev lus tau rov qab los rau spec tom qab hloov lub siab - lub hwj chim optics deb ntawm lub ces kaum kub thiab kho airflow kev taw qhia. Bandwidth tau npaj; kub tsis tau.
Ua ntej xa QSFP56 los yog siab -lub zog ntev- mus txog QSFP28, npaj nyob ib ncig ntawm lub module fais fab chav kawm qhov hloov pauv tso cai, cov kev taw qhia airflow (pem hauv ntej- rau-rov qab thiab rov qab- rau- pem hauv ntej), tus neeg muag khoom qhov kub thiab txias, qhov ntsuas kub nyob hauv DOM nyeem, muaj zog txawm tias nyob sib ze {8} cov chaw nres nkoj txias muaj peev xwm. Thiab vim tias PAM4 txuas yog nyob ntawm RS-FEC kom kaw, kho FEC hom rau ob qho kawg ua ntej lub qhov rais hloov pauv tsis yog thaum lub sijhawm nws.
Xaiv los ntawm Scenario
Tsis yog ib qho generic "xaiv qhov ceev tshaj plaws," phim qhov optic rau qhov xwm txheej. Cov lus hauv qab no suav nrog cov rooj plaub uas tuaj ntau zaus.
| Scenario | Pom zoo tiam | Vim li cas |
|---|---|---|
| Tuav ib qho qub txeeg qub teg 40G core | QSFP + | Ports yog 40G; kev khiav tsheb tsis pom zoo 100G rov tsim dua. |
| 25G servers pub 100G uplinks | QSFP28 | Ntxuav 100G-rau-4 × 25G breakout thiab qhov tob tshaj plaws optic ecosystem. |
| 50G servers pub 200G qaum | QSFP56 | 200G ib qhov chaw nres nkoj nrog 4 × 50G breakout matched rau 50G nkag. |
| Siab -density 1RU aggregation | QSFP28 los yog QSFP56 | Nyob ntawm seb tus txha nraub qaum xav tau 100G lossis 200G - thiab nyob rau hauv lub taub hau thermal. |
| Cov peev nyiaj- hloov kho qhov tseem ceeb nce ntxiv | QSFP28 | Mature pricing, broad switch support, low deployment risk. |
| Cov ntaub tshiab nrog 400G txoj hauv kev | Ntsuas QSFP-DD | Lub 200G optic tej zaum yuav luv luv -cov kauj ruam nyob yog tias 400G yuav tshwm sim. |
QSFP28 vs QSFP56: txoj kev hloov kho tshiab twg ua rau kev nkag siab?
Nyob ntawm QSFP28 thaum lub network sib koom ua ke 100G, cov txheej txheem neeg rau zaub mov yog 25G, thiab qhov tseem ceeb yog tus nqi paub tab thiab pheej hmoo tsawg. Txav mus rau QSFP56 thaum txheej txheej nkag yog tiag tiag 50G lossis tus txha nraub qaum yog congested ntawm 100G thiab lub platform, cabling thiab FEC txoj kev npaj yog tag nrho PAM4-npaj. Cov lus nug txiav txim tsis yog "yog 200G sai dua" - nws pom tseeb yog - tab sis "puas ntxiv ntawm qhov txuas txhawb PAM4 hnub no, thiab yuav 200G tseem yuav yog qib zoo hauv ob xyoos, lossis yuav tsum cov peev nyiaj mus rau 400G."
Thaum tsis xaiv QSFP56
Hla QSFP56 yog tias koj cov chaw nres nkoj tsis txhawb 50G PAM4, yog tias tus neeg rau zaub mov nkag mus tseem yog 10G lossis 25G (lub 200G uplink yuav zaum tsis muaj), yog tias lub khib tsis tuaj yeem nqus qhov ntxiv rau -chaw nres nkoj cua sov, lossis yog tias koj daim ntawv qhia kev dhia mus rau 400G sai sai uas 200G dhau los ua ib qho kev sib tw. Kev yuav 200G optic rau qhov chaw nres nkoj uas tsis tuaj yeem khiav PAM4 yog qhov kim tshaj plaws ntawm cov duab{12}} yuam kev.
QSFP56 vs QSFP-DD
Yog tias koj tab tom tsim cov ntaub tshiab nrog txoj hauv kev meej rau 400G, QSFP-DD yog qhov tsim nyog hnyav rau QSFP56. QSFP-DD ntxiv ib kab thib ob ntawm txoj kab hluav taws xob (yim tsis yog plaub) thiab yog cov qauv zoo sib xws rau 400G, thaum tseem muaj peev xwm tuav qis dua -kev ceev optics ntawm ntau lub platform. Nws tsis yog qhov poob qis - hloov pauv rau txhua qhov kev siv QSFP56, txawm hais tias - qhov kev xaiv hloov pauv ntawm koj lub platform hloov, txoj kev npaj tawm, pob nyiaj siv kho qhov muag thiab bandwidth roadmap. PebQSFP-DD technical overviewtaug kev los ntawm qhov chaw uas nws haum rau plaub - tiam neeg.
Dab tsi los txheeb xyuas ntawm Hloov Cov Ntaub Ntawv
Feem ntau qhov txuas- ua tsis tiav yog txiav txim siab ntawm daim ntawv teev cov ntaub ntawv, tsis nyob hauv khib. Ua ntej koj tsa ib daim ntawv xaj, nyeem cov ntaub ntawv hauv lub platform rau cov ntsiab lus no:
- Qhov ib -chaw nres nkoj ceev hom lub tawb yeej txhawb nqa (40G / 100G / 200G), tsis yog hom txuas xwb.
- Kev txhawb nqa -optics lossis compatibility matrix rau lub platform thiab software tso tawm.
- Qhov twg breakout faib cov duab OS nthuav tawm ntawm qhov chaw nres nkoj (4 × 10G, 4 × 25G, 4 × 50G).
- Qhov siab tshaj plaws module fais fab chav kawm ib lub tawb, thiab ib qho kev txwv thaum muaj cov chaw nres nkoj nyob sib ze.
- Lub neej ntawd thiab configurable FEC hom rau txhua qhov ceev.
- Cov kev taw qhia airflow ntawm lub chassis thiab nws cov ntsuas kub ua haujlwm.
Feem ntau yuam kev kom zam
Qhov tsib uas rov tshwm sim feem ntau: yuav qhov optic ceev tshaj plaws yam tsis tau kuaj xyuas qhov chaw nres nkoj qhov kev txhawb nqa hom; Piv txwv tias mechanical haum sib npaug ntawm hluav taws xob compatibility; reusing ib tug breakout cable los ntawm lwm tiam; tawm hauv FEC mismatched ntawm PAM4 txuas; thiab npaj bandwidth thaum tsis nco qab qhov cua sov uas siab dua -kev ceev optics ntxiv rau qhov hloov ceev. Txhua tus yog pheej yig kom tsis txhob ntawm daim ntawv thiab kim kom caum thaum lub iav racked.
FAQ
Q: Puas yog QSFP zoo ib yam li QSFP +?
A: Tsis yog raws nraim - QSFP npe plaub- txoj kab tsev neeg, thaum QSFP+ tshwj xeeb yog 40G tiam. Vim tias QSFP + ua ntej, cov ntsiab lus tau siv sib hloov, yog li "QSFP optic" cov kab khoom yuav tsum tau daws kom nrawm ua ntej yuav khoom.
Q: Puas yog QSFP28 rov qab sib haum nrog QSFP +?
A: Nws tuaj yeem ua tau, hauv ib qho kev coj. QSFP28 (100G) chaw nres nkoj feem ntau tuaj yeem raug teeb tsa rau 40G kom lees txais QSFP + module, uas yog qhov kev hloov kho tshiab ua haujlwm li cas. Qhov thim rov qab tsis yog: QSFP + chaw nres nkoj tsis tuaj yeem khiav QSFP28 module, vim nws tsis muaj 25G-rau- txoj kab hluav taws xob cuam tshuam.
Q: Kuv puas tuaj yeem siv QSFP56 module hauv QSFP28 chaw nres nkoj?
A: Tsis yog QSFP56 xav tau 50G PAM4 txoj kab, thiab QSFP28 chaw nres nkoj muab 100G NRZ kab. Tsis muaj kev teeb tsa uas hloov 100G NRZ chaw nres nkoj rau hauv 200G PAM4 chaw nres nkoj; txoj kev lawv tus kheej txawv.
Q: Qhov txawv ntawm QSFP28 thiab QSFP -DD yog dab tsi?
A: QSFP28 yog plaub- txoj kab 100G daim ntawv foos. QSFP-DD ("ob chav ceev") ntxiv ib kab thib ob rau yim txoj kab hluav taws xob thiab yog 400G daim ntawv zoo sib xws, thaum tseem hosting qeeb optics ntawm ntau lub platform. QSFP-DD yog qhov kev nce qib thaum koj xav tau 400G, tsis zoo li-rau-zoo li sib pauv rau 100G.
Q: Puas yog QSFP56 ib txwm xav tau PAM4?
A: Rau nws haiv neeg 200G kev ua haujlwm, yog - 200G QSFP56 yog tsim rau plaub 50G PAM4 kab thiab RS-FEC uas PAM4 nyob ntawm. Yog tias QSFP56-chaw nres nkoj muaj peev xwm tau teeb tsa mus rau 100G lossis 40G hom rau qhov qub optic, qhov txuas qis qis tuaj yeem khiav NRZ, tab sis qhov ntawd yog qhov chaw nres nkoj ua haujlwm raws li cov tiam dhau los, tsis yog QSFP56 optic khiav yam tsis muaj PAM4.
Q: Puas yog QSFP28 thiab QSFP56 xav tau cov kab sib txawv?
A: Rau kev tawg thiab DAC / AOC, yog - cov no tau sib phim rau txoj kab nrawm (4 × 25G vs 4 × 50G), yog li lawv tsis hloov pauv. Rau cov txheej txheem fiber ntau, SR4 ntawm ob tiam siv MPO / MTP thiab WDM ib leeg - hom variants siv duplex LC, tab sis qhov kev txhawb nqa ncav cuag thiab qib fiber ntau sib txawv, yog li paub meej tias optic tus spec tiv thaiv cov cabling.
Q: Puas yog QSFP28 tseem tsim nyog xa tawm?
A: Yog, thiab rau feem ntau 100G tsim nws tseem yog lub neej ntawd. 25G-server-rau-100G-uplink qauv yog paub tab, kev txhawb nqa dav thiab tsis tshua muaj kev pheej hmoo, thiab optic ecosystem yog qhov tob tshaj plaws ntawm peb. QSFP56 khwv tau nws cov nqi tsuas yog thaum koj muaj qhov yuav tsum tau 200G tiag tiag thiab txoj hauv kev npaj PAM4 los nqa nws.
Ntsiab Cai
QSFP+, QSFP28 thiab QSFP56 qhia plaub lub hnab ntawv - txoj kab tab sis ua haujlwm peb theem sib txawv: 40G, 100G thiab 200G, nrog QSFP56 hla mus rau PAM4 thaj chaw. Xaiv los ntawm qhov chaw nres nkoj hloov mus rau sab nraud, tsis yog los ntawm optic sab hauv - paub meej tias qhov kev txhawb nqa ceev, daim ntawv teev npe optic, kev them nyiaj yug breakout, fiber ntau thiab connector, ncav cuag, FEC thiab thermal pob nyiaj ua ntej koj yuav. Rau 100G hnub no, QSFP28 tseem yog qhov ua tau zoo; QSFP+ tseem suav nrog 40G keeb kwm; thiab QSFP56 yog txoj cai hu rau tiag tiag 200G ceev, tab sis tsuas yog thaum tag nrho cov txuas - chaw nres nkoj, optic, cable, FEC thiab cua txias - yog engineered rau nws.
