25G SFP28 Module Guide: Yuav Ua Li Cas Xaiv Qhov Zoo
Mar 30, 2026| Ib qho 25G SFP28 module yog compact, kub -pluggable optical transceiver uas xa 25 Gigabit Ethernet kev sib txuas ntawm ib txoj kab. Nws qhia tib lub cev daim ntawv tseem ceeb xws li SFP thiab SFP + modules, uas txhais tau hais tias cov nroj tsuag cabling uas twb muaj lawm tuaj yeem rov qab siv dua thaum lub chaw nres nkoj host twb txhawb nqa SFP28 kev ua haujlwm. SFP28 modules yog siv nyob rau hauv cov chaw zov me nyuam, 5G fronthaul networks, cov chaw lag luam hauv tsev kawm ntawv, thiab qib siab -kev ua tau zoo suav nrog qhov twg 10G bandwidth tau dhau los ua lub tog raj kheej tab sis 100G tseem raug nqi- txwv tsis pub ntawm txheej nkag.
SFP28 txhais li cas tiag?
"SFP" stands for Small Form-factor Pluggable - kev lag luam-tus qauv tsim rau kub-swappable network modules uas tau siv rau ntau tshaj nees nkaum xyoo. Qhov "28" yog hais txog qhov hluav taws xob cuam tshuam txog li 28 Gbps. Hauv kev xyaum, cov qauv siv rau 25 Gigabit Ethernet (txhais los ntawm IEEE cov qauv 802.3by thiab 802.3cc) thiab 32G Fiber Channel daim ntawv thov. Vim li cas 28 Gbps es tsis yog 25? Lub peev xwm ntxiv muab lub taub hau rau cov txheej txheem nyiaj siv ua haujlwm, kev kho qhov yuam kev encoding, thiab moos rov qab - cov haujlwm tu vaj tse uas siv bandwidth dhau qhov nominal 25G cov ntaub ntawv tus nqi.
Los ntawm qhov pom ntawm lub cev, SFP28 transceiver zoo ib yam rau cov laus SFP + module. Ob leeg sib koom tib qhov ntev (8.5 × 13.4 × 56.5 mm) thiab siv tib lub 20-pin hluav taws xob txuas. Qhov kev sib raug zoo rov qab no yog qhov laj thawj tseem ceeb vim li cas 25G kev saws me nyuam tau txav nrawm heev hauv cov ntaub ntawv chaw ib puag ncig: cov neeg ua haujlwm hauv lub network tuaj yeem ntsaws SFP28 module rau hauv SFP28-muaj peev xwm chaw nres nkoj ntawm qhov hloov tshiab thiab tam sim ntawd tau txais 2.5 npaug ntawm cov khoom siv uas lawv muaj nrog SFP+ - tsis muaj fiber ntau khiav, tsis muaj khib nyiab reconfiguration xav tau.
SFP28 vs. SFP+: Vim Li Cas Txoj Kev Txhim Kho Qhov Tseem Ceeb
Yog tias koj lub network tseem tab tom khiav 10G SFP + kev sib txuas ntawm cov txheej txheem nkag mus rau server, cov ntaub ntawv hloov kho rau 25G SFP28 yog qhov nyuaj. Txhua qhov chaw nres nkoj SFP28 muab 25 Gbps - 2.5 zaus bandwidth ntau dua li SFP+ - thaum kos duab kwv yees tib lub zog (feem ntau 1.0 W txog 1.5 W nyob ntawm qhov ncav cuag). Raws li ib qho -gigabit hauv paus, uas ua rau SFP28 muaj zog ntau dua -nqi, thiab tus nqi ib gigabit tau poob tsis tu ncua raws li cov khoom ntim tau nce ntxiv.
Rov qab compatibility tsim nyog tshwj xeeb mloog ntawm no. Yog tias koj ntsaws qhov qub SFP + module rau hauv qhov chaw nres nkoj SFP28, qhov chaw nres nkoj yuav cia li qeeb rau 10G thiab ua haujlwm ib txwm. Qhov no ua rau maj mam, kauj ruam-los ntawm- kauj ruam kev tsiv teb tsaws chaw: koj tuaj yeem hloov kho cov neeg rau zaub mov NICs thiab sab saum toj- ntawm- khib hloov mus rau 25G- muaj peev xwm kho vajtse tam sim no, thiab tom qab ntawd hloov pauv hauv SFP28 optics dhau sijhawm raws li koj qhov kev xav tau loj hlob. Qhov kev hloov pauv ntawd muaj txiaj ntsig tshwj xeeb rau cov koom haum khiav haujlwmsib xyaws -SFP ceev transceiver ib puag ncigqhov twg 10G thiab 25G coexist nyob rau tib lub chassis.
Ib qho kev ceeb toom tseem ceeb uas ntes tau ntau tus engineers tawm ntawm - tus neeg saib xyuas: qhov rov qab sib raug zoo ua haujlwm hauv ib qho kev taw qhia nkaus xwb. SFP28 cov chaw nres nkoj yuav lees txais cov laus SFP + modules thiab sib tham mus rau 10G - tab sis SFP28 modules feem ntau yuav tsis ua haujlwm hauv SFP + chaw nres nkoj qub. Feem ntau SFP + cov chaw nres nkoj cap ntawm 10 Gbps thiab yuav tsis lees txais qhov nrawm nrawm dua. Qee cov keyboards kuj xav kom koj manually teeb qhov chaw nres nkoj ceev ntawm kab hais kom ua ua ntej ntxig rau qhov sib txawv - tus nqi module; hla cov kauj ruam ntawd, thiab koj tuaj yeem siv sijhawm ib teev los daws qhov txuas uas tsuas yog xav tau ib qho CLI hais kom kho.
Kev Ceeb Toom Kev xa tawm - Kev nrawm nrawm-Txoj kev sib thamYog tias koj tab tom npaj ib theem 10G-rau-25G tsiv teb tsaws, txheeb xyuas qhov chaw nres nkoj- theem kev txhawb nqa ceev ntawm txhua tus qauv hloov hauv txoj hauv kev ua ntej xaj SFP28 optics. Nws tsis yog qhov tsis yooj yim rau lub tsev kawm ntawv sib xyaw cov neeg muag khoom kom muaj qee qhov hloov pauv uas nws SFP + cov chaw nres nkoj tsis lees txais 25G modules, thaum lwm tus tswj hwm kev hloov pauv tau zoo. Thaum tsis ntseeg, sim ib qho module hauv lub qhov rais txij nkawm ua ntej xaj hauv ntau.
Hom 25G SFP28 Module thiab Lawv Cov Lus Qhia
Tsis yog tag nrho 25G SFP28 transceivers hloov pauv tau. Txoj cai module rau koj lub network nyob ntawm peb yam: lub teeb liab yuav tsum tau mus deb npaum li cas, hom fiber ntau cable koj twb tau teeb tsa, thiab ib puag ncig ntawm kev xa tawm. Ntawm no yog ib qho kev sib cais ntawm thawj qhov sib txawv, ua raws li ib sab - los ntawm - sab sib piv lub rooj rau kev siv ceev.
25G SFP28 SR (Short Reach)
SR module yog tsim los rau luv -kev sib txuas ntawm qhov deb - mus txog 100 meters. Nws siv 850 nm laser ua ke nrog ntau hom fiber ntau (hom fiber ntau cable feem ntau ua ntej- nruab rau hauv cov ntaub ntawv chaw tsev). Koj yuav xav tau OM3 lossis OM4 qib multimode fiber ntau nrog tus qauv LC duplex connectors. Qhov siab tshaj plaws yog 70 meters ntawm OM3 fiber ntau thiab 100 meters ntawm OM4, yog tias RS-FEC (ib daim ntawv kho qhov yuam kev) tau qhib rau ntawm qhov chaw nres nkoj hloov. Yog tsis muaj FEC enabled, usable deb poob mus rau roughly 30-50 meters nyob ntawm seb qhov xwm ntawm koj fiber.
Qhov no yog lub workhorse module rau kev sib txuas hauv ib lub chaw cov ntaub ntawv - server- mus rau - hloov cov kev sib txuas, kev sib txuas cia hauv kab khib, thiab siab - kev ua tau zoo ntawm kev sib txuas. SR modules yog qhov qis tshaj - tus nqi kho qhov muag SFP28 kev xaiv thiab siv tsawg dua 1.0 W ntawm lub zog txhua qhov, ua rau lawv zoo tagnrho rau siab - kev xa tawm ceev uas muaj ntau tus neeg siv ib qho kev hloov.
25G SFP28 LR (ntev ncav cuag)
LR modules yog tsim rau kev ncua mus txog 10 kilometers. Lawv siv 1310 nm laser thiab xav tau ib qho - hom fiber ntau (OS2 qib) - hom fiber ntau ntau dua li cov SR modules siv. Lub zog noj yog me ntsis siab dua SR, feem ntau ntawm 1.0 thiab 1.5 W rau ib qho module.
Kev siv ib txwm muaj xws li kev sib txuas cov tsev sib cais ntawm ib lub tsev kawm ntawv, txuas cov ntaub ntawv chaw nyob thoob plaws hauv cheeb tsam nroog, thiab 5G midhaul (qhov kev sib txuas ntawm nruab nrab thiab faib cov haujlwm hauv network). Qhov 10 km thaj tsam npog feem ntau ntawm kev lag luam thiab cov neeg nqa khoom sib cuam tshuam - qhov chaw nyob deb tsis tas yuav tsum muaj lub teeb liab amplifiers lossis repeaters, uas ua rau tag nrho cov nqi txuas tuaj yeem tswj tau. Tus nqi tseem ceeb-txuag cov lus qhia: yog tias koj qhov kev ncua deb yog 8 km, koj tsis tas yuav 40 km - ntsuas ER module - xaiv qhov kev ncav cuag koj tiag tiag -kev ncua deb hauv ntiaj teb yog ib txoj hauv kev yooj yim los txo cov kev siv nyiaj optics yam tsis muaj kev ntseeg siab.
25G SFP28 ER (Ntxiv mus cuag)
Thaum koj qhov txuas txuas txuas mus rau 40 mais, ER modules yog cov lus teb. Cov no siv lub tshuab xa hluav taws xob muaj zog dua thiab lub tshuab txais ntau dua kom tswj tau cov teeb liab zoo dua ntev fiber ntau khiav. Lawv ua haujlwm ntawm ib qho - hom fiber ntau ntawm 1310 nm thiab siv kwv yees li 1.5–2.0 W. RS-FEC ntawm qhov chaw nres nkoj host yog xav tau rau tag nrho- kev khiav haujlwm deb.
Cov chaw muab kev pabcuam txuas rau thaj chaw sib cais, cov chaw lag luam txuas cov chaw nyob deb nroog, thiab 5G backhaul txuas txuas mus rau thaj chaw deb nroog lossis nyob deb nroog txhua qhov cia siab rau ER optics. Thaum tus nqi ntawm ib qho - qauv yog siab dua LR, lub peev xwm los npog 40 km yam tsis tau ntxiv cov cuab yeej nruab nrab feem ntau ua rau ER qhov kev xaiv pheej yig dua thaum tag nrho cov nqi vaj tse raug txiav txim siab.
25G BiDi SFP28
Cov qauv qauv siv ob txoj hlua fiber ntau - ib qho xa mus, ib qho tau txais. Bidirectional (BiDi) modules txo qhov ntawd mus rau ib qho strand los ntawm kev xa thiab tau txais ntawm qhov sib txawv wavelengths ntawm lub teeb ib txhij. Lawv yuav tsum tau muab tso rau hauv kev sib tw ua ke: ib qho "Hom A" module ntawm ib qho kawg thiab "Type B" module ntawm lwm qhov. Txhua hom siv qhov rov qab ua haujlwm wavelength (piv txwv li, Hom A xa tawm ntawm 1310 nm thiab tau txais ntawm 1490 nm, thaum Hom B ua qhov sib txawv). BiDi SFP28 transceivers feem ntau ncav cuag 10–15 km dhau ib zaug - hom fiber ntau.
BiDi yog qhov tseem ceeb tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej uas cov fiber ntau strand suav raug txwv, vim nws txiav cov fiber ntau hauv ib nrab piv rau cov qauv ob -fiber modules. Qhov no ua rau nws yog qhov kev xaiv nrov rau 5G fronthaul deployments, qhov chaw fiber ntau qhov chaw feem ntau txwv ntawm cov xov tooj ntawm tes thiab cov chaw ua haujlwm hauv baseband. Network neeg ua hauj lwm ntsuam xyuasindustrial -qhov kub thiab txias optical transceiver xaivrau cov xov tooj cua sab nraum zoov feem ntau xaiv BiDi SFP28 modules nrog kev ua haujlwm txuas ntxiv (-40℃txog 85 degree).
BiDi Paired Deployment ReminderKev txiav txim tsis sib haum BiDi khub yog qhov ua yuam kev tsis txaus ntseeg, tshwj xeeb tshaj yog nyob rau hauv loj - teev 5G rollouts qhov twg ntau pua modules xa mus rau ntau lub xov tooj ntawm tes. Txhua qhov txuas yuav tsum muaj ib hom A thiab ib hom B ntawm qhov sib txawv ntawm qhov kawg - yog tias ob qhov kawg tau txais tib hom, qhov txuas yuav tsis ua haujlwm. Ua ntej tshaj tawm ib qho kev txiav txim ntau, qhia tawm txhua qhov txuas qhov kawg thiab muab cov npe A / B qhia meej. Ib qho kev ua yuam kev ntawm daim ntawv xaj ntawm theem xaj yog qhov pheej yig dua los kho dua li xa tus kws tshaj lij.
25G CWDM thiab DWDM SFP28
Wavelength -division multiplexing (WDM) modules tso cai rau ntau qhov kev ywj pheej 25G los qhia ib khub fiber ntau - zoo tig ib fiber ntau rau hauv ntau lub fibers virtual. CWDM modules siv wavelengths sib nrug 20 nm thiab ncav cuag 10-40 km. DWDM modules ntim cov channel nruj dua, ua kom muaj kev sib txuas ntau dua ntawm tib lub fiber ntau.
Cov qauv no yog qhov tseem ceeb hauv 5G fronthaul tes hauj lwm uas muaj rau lossis ntau dua 25G kev sib txuas yuav tsum tau sib koom ua ke ib qho fiber ntau khiav ntawm lub hauv paus ua haujlwm thiab ntau qhov chaw kav hlau txais xov. Lawv kuj ua hauj lwm hauv metro aggregation scenarios qhov kev txhim kho fiber ntau yog qhov tsis zoo lossis txwv tsis pub kim. Kev nkag siabnetwork transceiver nta xws li wavelength matching thiab modulation schemesNws yog ib qho tseem ceeb thaum qhia txog WDM optics kom tsis txhob cuam tshuam kev ua haujlwm tsis zoo.
Ib qho yuam kev thiab raug nqi ntau nrog WDM kev xa tawm: kev yuav ob lub modules uas tshwm sim tau sib xws ntawm daim ntawv - ob qho tib si - hom, ob qho tib si ntsuas rau tib qhov deb - tsuas yog nrhiav qhov txuas tsis kam tuaj. Tus neeg ua txhaum feem ntau yog qhov tsis sib haum xeeb wavelength (xws li, ib qho module ntawm 1310 nm thiab lwm qhov ntawm 1550 nm). Tshwj tsis yog tias koj txhob txwm siv BiDi thev naus laus zis tsim los rau qhov sib txawv wavelengths, ob qhov kawg ntawm qhov txuas yuav tsum siv tib lub wavelength. Thaum xaj CWDM lossis DWDM optics rau ntau- qhov chaw xa tawm, nco ntsoov xyuas qhov tseeb wavelength assignments ib channel ua ntej tso qhov kev txiav txim.
Wavelength Mismatch - Ib Tiag -Lub Ntiaj Teb Kev Ua Tsis Taus ScenarioQhov teeb meem no yog qhov txaus ntshai tshaj plaws hauv cov koom haum uas tau txais kev kho qhov muag los ntawm cov neeg muag khoom sib txawv raws sijhawm. Ob lub modules tuaj yeem saib zoo ib yam ntawm daim ntawv lo - tib daim ntawv tseem ceeb, tib qhov kev ntsuam xyuas nyob deb, tib hom fiber ntau - thiab tseem tsis kam txuas vim qhov wavelength mismatch faus rau hauv daim ntawv spec. Ua ntej txhua qhov kev txiav txim ntau, rub lub wavelength tiag tiag los ntawm cov ntaub ntawv muag khoom thiab hla - siv ob qhov kawg ntawm txhua qhov txuas tau npaj tseg.
Ceev-Kev sib piv: Yam Module Koj Xav Tau?
| Hom Module | Max nrug | Hom Fiber | Lub wavelength | Hwj chim Draw | Tus nqi txheeb ze | Zoo tshaj rau |
|---|---|---|---|---|---|---|
| SR(Short Reach) | 100 m (OM4) 70 m (OM3) |
Multimode OM3 / AWM 4 |
850nm ua | < 1.0 W | $ qis tshaj | Hauv cov ntaub ntawv chaw - server-rau - hloov, cia, HPC pawg txuas |
| LR(Long Reach) | 10km ua | Tib - hom OS 2 |
1310nm ua | 1.0 – 1.5 W | $$ Mid | Tsev-rau- tsev kawm ntawv txuas, metro DCI, 5G midhaul |
| ER(Extended Reach) | 40km ua | Tib - hom OS 2 |
1310nm ua | 1.5 – 2.0 W | $$$ Siab dua | Ntev -haul campus, carrier inter-chaw ua hauj lwm, 5G backhaul hla nyob deb nroog / suburban spans |
| BiDi(Bidirectional) | 10-15 km | Tib - hom OS 2, single strand |
1270/1330 nm los yog 1310/1490 nm (pair A + B) |
1.0 – 1.5 W | $$ Mid | Fiber- txwv qhov chaw - 5G fronthaul, txwv qhov chaw duct |
| CWDM | 10-40 km | Tib - hom OS 2 |
1271 – 1331 nm (20nm nrug) |
1.0 – 1.5 W | $$$ Siab dua | Multiplexing ob peb 25G raws ntawm ib fiber ntau - 5G fronthaul, metro WDM |
| DWDM | 40 km + | Tib - hom OS 2 |
C-pab (dense spacing) |
1.5 – 2.5 W | $$$$ Siab tshaj | Qhov siab tshaj plaws channel ceev ntawm fiber ntau - cab kuj - qib metro networks |
Yuav Ua Li Cas Nyeem Cov Lus no (Rau Pab Pawg Muag Khoom)Pib nrog ob lo lus nug:
(1) Ob qhov kawg ntawm qhov txuas no nyob deb npaum li cas?Qhov ntawd txiav txim siab koj qhov kev ncua deb thiab nqaim "Module Type" kem.
(2) Dab tsi ntawm fiber ntau cable twb ntsia?Multimode (OM3 / OM4) yog muaj nyob rau hauv cov ntaub ntawv chaw tsev; single-mode (OS2) yog siv rau kev khiav sab nraum zoov ntev dua ntawm cov tsev. Muab ob lo lus teb rau lub rooj, thiab koj yuav muaj koj cov npe luv. Yog tias koj qhov kev ncua deb qis dua 100 m thiab koj muaj ntau hom fiber ntau, SR yuav luag txhua qhov kev xaiv. Yog tias koj tab tom txuas cov tsev sib txawv txog li 10 km sib nrug ntawm ib qho - hom fiber ntau, LR yog tus qauv xaiv. Tsuas yog txav mus rau ER, BiDi, lossis WDM modules thaum nyob deb, fiber ntau tsis txaus, lossis channel ceev tshwj xeeb xav tau.
Cov Ntawv Thov Tseem Ceeb Tsav Tsheb 25G SFP28 Txais
Peb qhov xwm txheej xa mus rau feem ntau ntawm 25G SFP28 xav tau thoob ntiaj teb.
Data center server connectivity (ntse{0}}leaf architecture).Cov ntaub ntawv siv ntau tshaj plaws yog txuas cov servers rau lawv qhov chaw nyob ze. Raws li daim npav network server tau tsiv los ntawm 10G mus rau 25G - kev hloov pauv uas pib nyob ib puag ncig 2018-2019 thiab nrawm dhau los ntawm 2024 - qhov hloov chaw nres nkoj ntsib txhua tus neeg rau zaub mov xav tau qhov sib piv SFP28 module. Ib qho kev hloov pauv hloov pauv nrog 48 SFP28 downlink ports thiab 6 QSFP28 uplink ports aggregates 1.2 Tbps ntawm server bandwidth mus rau 600 Gbps ntawm cov peev txheej sab saud - 2: 1 piv uas ua haujlwm zoo rau feem ntau huab thiab kev lag luam ua haujlwm. Cov koom haum ua haujlwm latency- cov ntawv thov nkag siab zoo li kev lag luam nyiaj txiag lossis qhov tseeb- lub sijhawm tshuaj ntsuam xyuas feem ntau tsom rau 1: 1 piv, uas ua rau siab dua - nrawm nrawm txuas txawm tias txheej txheej nkag mus nyob ntawm 25G. 100G QSFP28 uplinks lawv tus kheej siv plaub txoj kab 25G sab hauv, uas txhais tau hais tias25G SFP28 transceiveryog lub hauv paus tsev thaiv ntawm tag nrho cov ntaub network.
5G fronthaul thiab midhaul.Lub architecture ntawm 5G xov tooj cua tes hauj lwm tsim loj heev thov rau 25G kho qhov muag txuas ntawm centralized ua units thiab tej thaj chaw deb xov tooj cua units ntawm cell yees. 25G SFP28 ntu yog pawg optics tseem ceeb hauv 5G kev ua lag luam hauv 2024, tau tsav los ntawm kev tsim tawm sai ntawm macro hauv paus chaw nres tsheb thoob ntiaj teb. Rau kev xa tawm sab nraum zoov, cov teeb meem tseem ceeb yog ib puag ncig - qhov kub thiab txias hloov pauv, lub sijhawm kom meej meej, thiab kev txwv lub cev ntawm cov chaw taws teeb tswj nrog lub zog thiab qhov chaw txwv. Muaj- ntsuas SFP28 modules (-40℃txog 85 degree) nrog kev txhawb nqa synchronization tau dhau los ua tus qauv rau cov cheeb tsam no. Thaum xa tawm thoob plaws ntau lub xovtooj ntawm tes nrog kev txwv tsis pub muaj fiber ntau, CWDM SFP28 modules tuaj yeem ua ntau yam 25G raws mus rau ib qho strand, txo cov nqi fiber ntau. Xaiv txoj cai transceiver rau kev sib txuas lus ib puag ncig muaj feem ntau dhau mus txog thiab wavelength - kev nkag siabqhov twg txawv transceiver optical fiber ntau ua tau zoo tshaj plawspab tiv thaiv tus nqi xa khoom yuam kev.
Enterprise tsev kawm ntawv thiab chaw cia khoom network.Cov koom haum sib txuas ntau lub tsev nyob hauv ib lub tsev kawm ntawv feem ntau xav tau 1-10 km kev sib txuas ntawm 25G - ib puag ncig zoo rau SFP28 LR modules dhau ib zaug - hom fiber ntau. Cov chaw khaws cia hauv cheeb tsam yog lwm qhov chaw loj hlob: 32G Fiber Channel, uas siv tib lub SFP28 lub cev sib cuam tshuam, tab tom hloov 16G tus qauv qub nyob rau hauv tag nrho -flash cia ib puag ncig qhov kev xav tau kev ua tau zoo tau dhau los dhau los - tiam kev sib txuas.
Yuav Ua Li Cas Xaiv Txoj Cai 25G SFP28 Module
Xaiv 25G SFP28 transceiver muaj ntau tshaj li qhov sib txawv ntawm tus lej mus rau hom fiber ntau. Ntau qhov kev ua tau zoo txiav txim siab seb tus qauv yuav ua tau zoo hauv koj qhov chaw tshwj xeeb.
Tshawb xyuas lub platform compatibility.SFP28 modules ua raws li kev lag luam- tus qauv dav dav (Qhov Kev Pom Zoo Ntau -Source Agreement, lossis MSA), tab sis qee qhov hloov chaw tsim khoom siv firmware checks uas tsis lees paub cov qauv tsis tshwj xeeb rau lawv lub npe. Reputable thib peb- tog transceiver lwm tus neeg muag khoom qhov kev pab cuam tus neeg muag khoom- cov cim qhia tshwj xeeb thiab cov qauv ntsuas ntawm qhov tseeb hloov kho vajtse ua ntej xa khoom. Qhov kev txiav txim siab ntawm kev yuav cov khoom lag luam qub (OEM) optics thiab thib peb - tog tau optics feem ntau los rau ib qhoKev ntsuam xyuas cov qauv ntawm SFP transceiver hom, tus nqi, thiab tus neeg muag khoom tus txheej txheem validation.
Paub meej tias koj cov nroj tsuag fiber ntau.Ntxig ib qho - hom module (xws li LR) rau hauv qhov txuas uas siv ntau hom fiber ntau yuav tsis ua haujlwm - ob hom fiber ntau nqa lub teeb nyob rau hauv txoj kev sib txawv. Ua ntej xaj optics, txheeb xyuas: (1) hom fiber ntau ntsia (multimode vs. single-mode), (2) hom connector polish (UPC yog tus qauv rau feem ntau SFP28 daim ntawv thov; APC connectors yuav ua teeb meem), thiab (3) tag nrho cov teeb liab poob nyob rau hauv qhov txuas nrog rau connectors thiab splices. Nyob rau ib zaug luv luv - hom khiav, kuj xyuas tias tau txais lub hwj chim yuav tsis pub dhau lub module lub siab tshaj plaws input - teeb liab ntau dhau yuav ua rau lub receiver puas, ib yam li cov teeb liab me dhau ua rau yuam kev.
Sau nyiaj rau FEC cov cai.Feem ntau 25G SFP28 modules xav tau kev kho qhov yuam kev rau pem hauv ntej (FEC) qhib rau ntawm qhov chaw nres nkoj hloov kom ua tiav lawv qhov ntsuas qhov deb. FEC yog qhov yuam kev digital- rov qab ua haujlwm ua rau hauv qhov hloov pauv - xav tias nws yog qhov chaw nyab xeeb uas ntes thiab kho qhov tsis raug xa mus ua ntej lawv cuam tshuam rau koj txoj kev tsheb. Yog tsis muaj FEC, usable ncav cuag poob qis heev. Paub meej tias koj qhov kev hloov pauv txhawb hom FEC xav tau (RS-FEC feem ntau) thiab qhov kawg ntawm qhov txuas tau teeb tsa tib yam.
Ntsuas lub zog thiab thermal txwv.Nyob rau hauv qhov siab - nplooj hloov qhov ntom ntom qhov twg tag nrho 48 SFP28 chaw nres nkoj muaj nyob, qhov sib xyaw ua ke ntawm cov khoom siv ib leeg tuaj yeem ncav cuag 50–70 W. Kev sib xyaw SR thiab LR modules hauv tib qhov hloov ua kom tsis sib xws uas tuaj yeem cuam tshuam cov chaw nyob sib ze. Ib txwm paub tseeb tias koj lub zog siv nyiaj siv hluav taws xob thiab cov qauv tsim kom txias tuaj yeem ua haujlwm ua haujlwm puv ntoob raws li qhov phem tshaj plaws -qhov kub thiab txias ua ntej xa mus rau qhov ntsuas.
Compatibility nrog 100G QSFP28 Los ntawm Breakout
Ib qho ntawm cov qauv siv tau zoo tshaj plaws txuas plaub qhov chaw nres nkoj SFP28 rau ib qho chaw nres nkoj QSFP28 siv qhov tshwj xeeb "breakout" cable. Nov yog qhov nws ua haujlwm li cas: 100G QSFP28 module ua tau muaj plaub txoj kev ywj pheej 25G. Ib txoj kab sib cais cais plaub txoj kab ntawd kom txhua tus txuas mus rau qhov chaw nres nkoj SFP28 cais ntawm qhov hloov pauv qis lossis server. Qhov no tuaj yeem ua tiav nrog ncaj qha - txuas tooj liab breakout cables (rau kev ncua deb li 5 meters), active optical breakout cables (txog 100 meters), los yog ib tug fiber ntau hlua nrog nyias optical modules ntawm txhua kawg. Txoj kev sib cais ua kom siv tau qhov chaw nres nkoj ntawm cov khoom siv hluav taws xob sab saud thiab ua kom yooj yim cabling nyob rau hauv ib puag ncig.
Rau cov koom haum nyob rau hauv nruab nrab ntawm ib tug phased tsiv teb tsaws qhov twg laus 10G keyboards thiab tshiab 100G keyboards coexist, breakout cables yuav ua hauj lwm raws li ib tug choj - tab sis qhov no yog nyob ntawm seb tus qauv hloov thiab firmware koom. Sab 100G khiav ntawm tag nrho 4 × 25G, thiab txhua txoj kab txuas mus rau qhov chaw nres nkoj hauv qab. Txawm hais tias qhov chaw nres nkoj downstream khiav ntawm 10G lossis 25G nyob ntawm qhov kho vajtse. Ib txwm txheeb xyuas qhov kev sib tw sib tw hauv koj cov ntaub ntawv hloov pauv ua ntej xav tias qhov topology no yuav ua haujlwm raws li qhov xav tau.
DAC thiab AOC Lwm Txoj Haujlwm rau Pluggable Optics
Rau kev sib txuas luv heev - nyob rau hauv ib lub racks los yog ntawm cov nyob sib ze racks - koj tsis tas yuav tsum tau kho qhov muag modules ntawm tag nrho cov . 25G SFP28 Direct Attach Copper (DAC) cables yog ua ntej- txiav tooj liab sib dhos uas ntsaws ncaj qha rau hauv SFP28 chaw nres nkoj ntawm ob qho kawg. Passive DAC txhawb nqa txog 3 meters ntawm 25G; Active DAC txuas mus rau kwv yees li 10 meters. Cov no ib qho -cov cables yog tus nqi qis tshaj plaws rau ib qhov txuas, tshem tawm txoj kev pheej hmoo ntawm cov khoom siv kho qhov muag qias neeg, thiab kos lub zog tsawg dua li cov transceivers cais. Active Optical Cables (AOC) txuas qhov sib txawv ntawm DAC thiab pluggable optics, ncav cuag li 100 meters siv fiber ntau tab sis tsis tas koj yuav tsum tau cais transceivers rau txhua qhov kawg. Ob qho kev xaiv sib xyaw ua ke hauv ib puag ncig qhov twgtransceivers ua haujlwm ntau lub luag haujlwmnyob rau hauv cov ntaub ntawv, cia, thiab network tiers.
Cov lus nug nquag
Q: Kuv puas tuaj yeem siv SFP + module hauv SFP28 chaw nres nkoj?
A: Yog. SFP28 cov chaw nres nkoj rov qab tau tshaj SFP + modules, tab sis qhov txuas yuav ua haujlwm ntawm 10G es tsis yog 25G. Qhov no muaj txiaj ntsig zoo thaum lub sijhawm tsiv teb tsaws theem tab sis yuav tsum tau kho raws li kev npaj ib ntus. Khiav SFP+ hauv SFP28 cov chaw nres nkoj ntev -lub sij hawm txhais tau tias koj them rau 25G- muaj peev xwm hloov kho vajtse yam tsis siv nws lub peev xwm. Yog tias koj tab tom siv 10G hnub no, xav txog kev yuav SFP28- muaj peev xwm hloov pauv tau li cas - koj zam lub forklift hloov kho dua tshiab tom qab thaum ua haujlwm xav tau 25G, thiab tus nqi them rau SFP28-npaj kho vajtse tau dhau los ua qhov tsis zoo.
Q: Qhov siab tshaj plaws nyob deb li cas ntawm 25G SFP28 module tuaj yeem ncav cuag?
A: Qhov ntev tshaj plaws - ncav cuag tus qauv 25G SFP28 module yog ER variant, uas txhawb nqa txog li 40 km dhau ib zaug - hom fiber ntau nrog RS-FEC enabled. Qee tus neeg muag khoom muab cov kev sib txuas txuas ntxiv DWDM uas tuaj yeem ncav cuag qhov zoo sib xws lossis ntau dua, txawm hais tias cov no feem ntau yog siv hauv cov cab kuj - qib metro WDM daim ntawv thov ntau dua li cov chaw lag luam cov ntaub ntawv.
Q: Puas yog 25G SFP28 modules los ntawm cov tuam txhab sib txawv ua haujlwm ua ke?
A: Kev sib koom ua haujlwm feem ntau ua tiav thaum kho qhov muag tshwj xeeb (wavelength, hwj chim theem, txais rhiab heev), host compatibility, EEPROM coding, thiab FEC chaw yog tag nrho ua ke. IEEE 802.3 thiab SFF-8402/SFF-8472 MSA tus qauv txhais cov yam ntxwv kho qhov muag, uas muab lub hauv paus rau tus ntoo khaub lig- neeg muag khoom sib xws. Kev sib xyaw cov npe ntawm ib qhov txuas yog ib qho kev coj ua hauv ntau - chaw muag khoom network ib puag ncig - tab sis nws tsis tau lees tias ua haujlwm tawm ntawm lub thawv. Firmware-level vendor locks, EEPROM coding mismatches, thiab FEC configuration sib txawv tuaj yeem tiv thaiv kev sib txuas los ntawm kev tuaj txog txawm tias cov optics lawv tus kheej yog technically haum. Kev soj ntsuam sib xyaw-cov neeg muag khoom txuas ua ntej cog lus rau kev tsim khoom yog ib txwm ua tau zoo.
Q: Puas yog FEC xav tau rau txhua qhov kev sib txuas 25G SFP28?
A: FEC tau txais kev pom zoo zoo thiab yuav tsum muaj txiaj ntsig zoo rau kev ua haujlwm puv - nrug ntawm feem ntau 25G SFP28 module hom. RS-FEC (Reed-Solomon Forward Error Correction) yog qhov yuav tsum tau muaj tshaj plaws, tshwj xeeb tshaj yog rau SR txuas tshaj 50 meters thiab tag nrho LR / ER txuas. Yog tsis muaj FEC, qhov kev ua tau zoo nyob deb thiab me ntsis yuam kev tus nqi kev ua tau zoo degrade ntau. Nco ntsoov xyuas FEC kev sib raug zoo ntawm ob lub chaw nres nkoj ua ntej xa mus.
Q: Ua li cas 25G SFP28 haum rau 100G network architecture?
A: Hauv qaum-nplooj cov ntaub ntawv chaw tsim qauv, 25G SFP28 modules muab kev nkag mus rau- txheej bandwidth los ntawm servers mus rau nplooj ntawv hloov. Cov nplooj hloov pauv tom qab ntawd siv 100G QSFP28 uplinks rau txheej txha nraub qaum, nrog rau txhua qhov txuas 100G nqa plaub 25G kab hauv. Qhov no 25G-rau-100G hierarchy yog qhov tseem ceeb hauv kev tsim kho hauv huab thiab cov chaw lag luam cov ntaub ntawv tsim los yog rov kho dua txij li xyoo 2020, thiab nws ntsuas ib txwm mus rau 400G kab laug sab txuas raws li kev xav tau tsheb loj hlob. Tib cov nroj tsuag fiber ntau thiab khib layouts uas txhawb 25G SFP28 neeg rau zaub mov txuas txuas ntxiv yuav ua haujlwm raws li qib kev nkag mus txawm tias kev sib sau ua ke bandwidth sib npaug - uas ua rau 25G ruaj khov mus sij hawm ntev ntawm cov txheej txheem nkag.