OM3 thiab OM4 yog ob qho tib si 50/125µm laser -optimized multimode fibers. OM4 muaj ntau dua modal bandwidth (4700 MHz·km vs 2000 MHz·km) thiab ncav cuag ntev dua. Yog tias koj 10GbE khiav qis dua 300 meters, OM3 ua haujlwm zoo. Npaj 40G lossis 100G txuas uas ncab tshaj 100 meters? OM4 yog tsim nyog rau tus nqi qis.
Txoj Kev Txiav Txim Tiag Tiag
Ua ntej dhia mus rau hauv specs, ntawm no yog cov logic peb taug kev cov neeg siv khoom thaum lawv nug "OM3 lossis OM4?"
- 10GbE, khiav qis dua 300m, nyiaj txiag teeb meem:OM 3. Tsis muaj kev ua tau zoo sib txawv ntawm qhov ceev thiab nyob deb.
- 10GbE, khiav ntawm 300-550m:OM 4. Qhov no yog tib theem ceev uas OM4 qhov kev ncua mus txog qhov tseem ceeb rau 10G.
- 40GbE lossis 100GbE, khiav qis dua 100m:Ob leeg ua haujlwm. OM3 txuag nqi; OM4 ntxiv margin.
- 40GbE lossis 100GbE, khiav 100-150m:OM 4. OM3 yuav tsis ua kom ntseeg tau.
- Txhua daim ntawv thov multimode tshaj 500m:Tsis txhob sib piv OM3 thiab OM4. Koj xav tau ib qho - hom fiber ntau.
Qhov ntawd suav nrog 90% ntawm qhov kev txiav txim siab. Cov seem ntawm tsab xov xwm no piav qhia vim li cas cov kev txiav tawm no muaj nyob thiab qhov twg cov rooj plaub ntug tau yooj yim.
Dab tsi tiag txawv ntawm OM3 thiab OM4
Ob lub fibers sib koom tib yam 50µm core, tib 125µm cladding, tib lub tsho aqua (feem ntau), thiab tib connector compatibility. Lawv tau tsim los rau ISO 11801 cov qauv thiab ua kom zoo rau 850nm VCSEL lasers. Los ntawm sab nraud, lawv zoo tib yam.
Qhov txawv yog nyob rau hauv: nruj npaum li cas lub refractive index gradient tswj thaum lub sij hawm tsim khoom. OM4 qhov kev ua siab ntev dua txo cov kev sib hloov pauv hloov pauv- lub sijhawm sib kis ntawm cov teeb pom kev sib txawv taug kev los ntawm fiber ntau. Tsawg dispersion txhais tau tias zoo dua modal bandwidth (EMB): 4700 MHz ·km rau OM4 piv rau 2000 MHz ·km rau OM3.
Tus lej bandwidth txhais ncaj qha rau hauv kev txhawb nqa nyob deb ntawm qhov muab ceev. Siab dua bandwidth=ntev dua ua ntej teeb liab tsis zoo.
Qhov deb txwv los ntawm kev ceev: Cov lej tseem ceeb
Nov yog qhov uas feem ntau cov ntawv tau sloppy. Lawv yuav qhia rau koj tias "OM3 ua 100m ntawm 100G, OM4 ua 150m" thiab cia nws nyob ntawd. Tab sis 100 Gigabit Ethernet tsis yog ib yam - nws yog ntau lub cev txheej txheem nrog cov kev xav tau fiber ntau sib txawv.
1 Gigabit thiab 10 Gigabit Ethernet
Ntawm 1GbE (1000BASE-SX), OM3 thiab OM4 ncav cuag 1000 meters. Tsis muaj ntsiab lus txawv.
Ntawm 10GbE (10GBASE-SR), qhov sib txawv yuav qhib:
- 3: 300 m
- OM4: 400 meters (tus qauv spec), mus txog 550 meters nrog siab - fiber ntau zoo thiab huv si sib txuas
Feem ntau cov lag luam 10GbE khiav zoo hauv qab 300 meters, yog li OM3 tuav lawv yam tsis muaj teeb meem. 300-400m cheeb tsam yog qhov twg OM4 yeej khwv tau nws qhov ceev ntawm qhov ceev no.
40 Gigabit Ethernet (40GBASE-SR4)
40GbE siv parallel optics: plaub txoj kab 10G kis hla plaub fibers hauv txhua qhov kev taw qhia, xav tau 8-fiberKev sib txuas MTP / MPO.
- 3: 100 m
- 4: 150 m
100 Gigabit Ethernet: Ob Tsiaj Tsiaj
Qhov no yog qhov tsis meej pem tshwm sim. "100G multimode" tuaj yeem txhais tau ob yam sib txawv:
100GBASE-SR4siv plaub txoj kab ntawm 25Gbps txhua, yuav tsum muaj 8- fiber ntau MPO connector (tib lub cev interface li 40GBASE-SR4). Kev txwv nyob deb:
- ua 3:70m
- Luas 4: 100 m
100GBASE-SR10siv kaum kab ntawm 10Gbps txhua, xav tau 24-fiber MPO connector. Kev txwv nyob deb:
- 3: 100 m
- 4: 150 m
SR4 yog ntau dua nyob rau hauv kev xa tawm tam sim no vim nws siv tsawg dua fiber ntau thiab ua raws li QSFP28 transceiver daim ntawv. SR10 muaj nyob tab sis pom kev txais yuav tsawg. Thaum ib tug neeg hais tias "100G dhau multimode," lawv yuav luag ib txwm txhais tau tias SR4-uas txhais tau tias OM3 maxes tawm ntawm 70 meters, tsis yog 100.
Peb tau pom cov neeg siv khoom spec OM3 rau 100G kev sib txuas yog tias 100-meter ncav cuag, tom qab ntawd nrhiav pom lawv qhov kev khiav 85-meter yuav tsis lees paub. Yog tias koj siv 100GBASE-SR4, kho 70 meters raws li OM3 qab nthab thiab npaj raws li.
Qhov yuam kev peb pom ntau zaus
Cov neeg siv khoom ntxhov siab dhau OM3 vs OM4 thaum qhov teeb meem tiag tiag yog lwm yam nkaus.
Hauv peb qhov kev paub dhau los, qib fiber ntau tsis tshua muaj teeb meem xa mus. Dab tsi ua rau muaj teeb meem:
- MPO polarity tsis sib haum.Txoj Kev A, B, lossis C? Tsis ncaj polarity tua qhov txuas tsis hais hom fiber ntau.
- qias neeg connectors.Lub speck ntawm plua plav ntawm MPO ferrule ua rau poob ntau dua qhov txawv ntawm OM3 thiab OM4 attenuation specs.
- Sib tov hom fiber ntau yuam kev.Ib tug neeg ua rau lub OM3 qaum rau hauv OM4 lub cev, los yog phem dua, txuas 50µm fiber ntau rau legacy 62.5µm OM1 infrastructure. Qhov tseem ceeb tsis sib haum (tsis yog qib) ua rau 3-4 dB poob.
- Transceiver/fiber ceev tsis sib haum.Txuas lub 10G-tsuas yog transceiver rau hauv qhov txuas tsim rau 40G parallel optics, ces xav tsis thoob vim li cas nws tsis ua haujlwm.
Yog tias koj tab tom ua ib qho tshiab, xaiv ib qib fiber ntau thiab ua qauv. OM4 tus nqi ntau dua tab sis tshem tawm qhov kev ntxhov siab nyob deb rau 40G / 100G hloov khoom dua tshiab. Yog tias koj ntxiv rau OM3 cov txheej txheem uas twb muaj lawm, lo nrog OM3 tshwj tsis yog koj paub tseeb tias koj xav tau qhov kev ncav cuag ntxiv -kev sib xyaw ua rau tag nrho txoj hauv kev rau OM3 kev ua tau zoo.
Thaum Yuav Hla Multimode Tag Nrho
Ntawm no yog cov lus qhia peb muab uas tej zaum yuav zoo li counterintuitive rau cov khoom siv fiber ntau: qee zaum cov lus teb tsis yog OM3 lossis OM4. Nws yog ib qho - hom.
Multimode fiber ntau tshwm sim vim nws pheej yig dua los txiav thiab keeb kwm yuav tsum tsis tshua kim transceivers. Tab sis tus nqi sib txawv ntawd tau nqaim . 10G tib- hom SFP + modules tam sim no raug nqi tsuas yog marginally ntau tshaj qhov sib npaug ntawm ntau hom. Thiab ib leeg - hom muab rau koj:
- Qhov deb tau ntsuas hauv kilometers, tsis yog meters
- Txoj kev txhim kho meej meej rau 25G, 40G, 100G, 400G yam tsis muaj kev txwv deb
- Tsis muaj OM3/OM4/OM5 tsis meej pem-OS2 ib leeg- hom tsuas yog ua haujlwm
Yog tias koj lub tsev - mus rau - lub tsev khiav ntau tshaj 300 meters, lossis yog tias koj tab tom txhim kho lub tsev kawm ntawv tshiab uas yuav tsum tau nyob ntev 15+ xyoo, ib zaug - hom feem ntau ua rau muaj kev nkag siab ntau dua li kev sim ncab ntau hom rau nws qhov kev txwv. Tus nqi siab dua me ntsis ntawm transceiver yuav koj yooj yim uas multimode tsis tuaj yeem phim.
Hais tias, rau cov ntaub ntawv chaw nplooj ntawv - qaum kev sib txuas, neeg rau zaub mov- mus rau - hloov cov kev sib txuas, thiab feem ntau intra- tsev khiav, multimode tseem raug nqi- siv tau thiab siv tau. Tsuas yog tsis txhob yuam nws qhov twg nws tsis haum.
Attenuation: Kev txhawj xeeb thib ob
OM3 fiber ntau qhia qhov siab tshaj plaws attenuation ntawm 3.5 dB / km ntawm 850nm. OM4 txhim kho qhov no mus rau 3.0 dB / km. Qhov sib txawv ntawm 0.5 dB / km suab muaj txiaj ntsig, tab sis ntawm qhov sib txawv ntawm qhov sib txawv (hauv qab 300 meters), nws txhais tau rau feem ntawm ib qho decibel-tsawg dua qhov sib txawv koj yuav pom ntawm cov khoom sib txuas.
Attenuation tseem ceeb dua rau kev sib txuas nyiaj txiag suav nrog hauv marginal installations. Yog tias koj thawb OM3 ze rau nws 300-meter txwv ntawm 10GbE nrog ntau lub ntsiab lus, txhua feem ntawm dB suav. Tab sis rau feem ntau cov qauv xa tawm, qhov bandwidth / nrug qhov sib txawv ntawm OM3 thiab OM4 yog qhov kev txiav txim siab ntau dua li kev txo qis.
Kev txheeb xyuas Fiber hauv cov kev teeb tsa uas twb muaj lawm
Quick version: OM3 thiab OM4 ob qho tib si ib txwm siv lub tsho aqua. Qee cov tuam txhab lag luam tam sim no siv "Erika Violet" (liab ntshav-magenta ntxoov ntxoo) tshwj xeeb rau OM4, tab sis kev saws me nyuam tsis sib haum -tshwj xeeb hauv North America qhov twg ntau ntawm OM4 tseem nkoj hauv aqua.
Yog tias koj yuav tsum txheeb xyuas cov kab ntawv tsis muaj npe: xyuas cov ntawv luam tawm ntawm lub tsho (cov neeg tsim khoom luam tawm hom fiber ntau nyob rau ib ntus), lossis rub cov ntaub ntawv. Kev pom xim ib leeg tsis txhim khu kev qha tshwj tsis yog tias koj paub tus installer ua raws li lub rooj sib tham violet.
Yuav ua li cas txog OM5?
OM5 (wideband multimode fiber) txhawb nqa luv wavelength division multiplexing hla 850-953nm. Nws ua kom muaj kev sib sau ua ke ntau dua los ntawm kev khiav ntau lub wavelengths dhau tib lub fiber ntau-pab tau rau 100G thiab 400G daim ntawv thov siv SWDM optics.
Rau feem ntau tam sim no xa mus, OM5 yog overkill. Nws yog rov qab sib xws nrog OM3 / OM4 ntawm tus qauv 850nm, yog li nws ua haujlwm rau yav tom ntej - pov thawj xaiv yog SWDM loj hlob. Tab sis hnub no, qhov kev txiav txim siab tseem tshuav OM3 vs OM4. Peb tsis thawb OM5 tshwj tsis yog tus neeg siv khoom muaj cov cai SWDM tshwj xeeb.
Tus nqi tiag
OM4 hais kom tus nqi them nqi tshaj OM3, tab sis qhov sib txawv tsis zoo rau cov hlua khi thiab cov rooj sib tham luv luv - qee zaum tsuas yog ob peb feem pua ntawm qhov sib txawv. Tus nqi tshaj yog pom tau ntau dua ntawm cov kab ntev ntev thiab loj - xaj kom muaj nuj nqis.
Qhov twg cov nqi suav tau nthuav dav: yog OM4 qhov kev ncua ntev tshem tawm qhov xav tau rau qhov nruab nrab ntawm cov khoom faib los yog tso cai sib sau ua ke ob chav khoom siv rau hauv ib qho, tus nqi them cable them rau nws tus kheej ntau zaus. Piv txwv li, yog tias tag nrho koj cov kev khiav hauj lwm haum zoo nyob rau hauv OM3 txwv, them nyiaj ntxiv rau qhov tsis muaj peev xwm siv tsis tau.
Peb feem ntau pom zoo: cov ntaub ntawv tshiab tsim cov qauv ntawm OM4; OM3 infrastructure nyob twj ywm OM3 tshwj tsis yog tias qhov txuas tshwj xeeb xav tau ntev dua; pob nyiaj siv- txwv tsis pub tej yaam num nrog sub-100m khiav tuaj yeem xaiv OM3 yam xyuam xim.
Qhov project tiag tiag Scenario Peb tau ua haujlwm dhau los
Qee qhov piv txwv los ntawm cov neeg siv khoom sib tham tiag tiag uas qhia txog qhov no ua li cas:
Scenario 1: Warehouse network upgrade.Lub tuam txhab logistics xav tau los txuas tshiab 10GbE hloov pauv thoob plaws 180,000 sq ft faib chaw. Qhov siab tshaj plaws: 140 meters. Lawv tus neeg cog lus tau hais OM4 "rau yav tom ntej- pov thawj." Peb coj: OM3 tuav 10GbE ntawm 300 meters yooj yim. Tshwj tsis yog lawv tab tom npaj 40G / 100G hauv 5 xyoo tom ntej (lawv tsis yog), OM4 ntxiv tus nqi yam tsis tau txais txiaj ntsig. Lawv tau mus nrog OM3 thiab txuag 12% ntawm kev xa xov.
Scenario 2: Cov ntaub ntawv chaw nplooj ntawv - qaum ntaub.Tus kws kho mob colocation tsim tawm cov pods tshiab nrog 100GBASE-SR4 nruab nrab ntawm qaum thiab nplooj hloov. Qhov nruab nrab khiav: 65 meters, ntev tshaj plaws: 95 meters. Lawv pib spec'd OM3 piv txwv li "100 meter" txwv lawv tau pom hauv ntau cov ntawv. Teeb meem: 100GBASE-SR4 ntawm OM3 maxes tawm ntawm 70 meters. Lawv qhov kev khiav 95-meter yuav tsis lees paub. Hloov mus rau OM4 (100-meter txwv rau SR4), daws teeb meem.
Scenario 3: Kev hloov cov pob txha hauv tsev kawm ntawv.Lub tsev kawm ntawv hloov kev laus OM1 infrastructure ntawm cov tsev. Qee qhov kev khiav tau tshaj 400 meters. Lawv nug txog OM4 kom ua kom muaj ntau qhov kev ncua deb. Peb cov lus qhia: ntawm 400+ meters, koj tab tom sib ntaus sib tua multimode physics. Tib -hom OS2 fiber ntau tus nqi me ntsis ntxiv rau cov transceivers tab sis muab lawv kilometer- nplai ncav cuag thiab 20- xyoo txhim kho txoj hauv kev. Lawv mus ib zaug -hom rau inter- kev sib txuas hauv tsev, khaws ntau hom rau kev faib tawm hauv tsev.
Cov piv txwv no qhia cov xov xwm sib xws: cov lus teb yog nyob ntawm qhov yuav tsum tau muaj nyob deb thiab muaj tseeb hloov kho raws sijhawm, tsis yog qhov theoretical "dab tsi yog" scenarios.
Connector thiab Termination Notes
Ob leeg OM3 thiab OM4 siv tib yam kev txiav tawm kho vajtse.LC connectorsdominate niaj hnub kev teeb tsa rau kev sib txuas duplex;MTP / MPO connectorskov parallel optics rau 40G thiab 100G. Factory-tso tseg cov rooj sib tham muab kev ua haujlwm tsis tu ncua ntau dua li kev txiav tawm ntawm thaj chaw- yog tias koj siv siab - txuas nrawm, ua ntej- txiav tawmOM4 MTP lub cev thiab tawg cablestxo qhov sib txawv ntawm kev teeb tsa.
Ib qho lus ceeb toom: rau 40G / 100G parallel optics, txheeb xyuas MPO polarity hom (Txoj Kev A, B, lossis C) qhov sib tw ntawm lub cev cables thiab khoom siv. Polarity yuam kev ua rau kev sib txuas tsis ua haujlwm uas tsis muaj dab tsi cuam tshuam nrog qib fiber ntau.
Cov lus nug nquag
Q: Kuv puas tuaj yeem sib xyaw OM3 thiab OM4 hauv tib qhov txuas?
A: Yog, lawv lub cev sib xws (tib yam 50µm core). Tab sis qhov txuas ua tau zoo ntawm OM3 specifications -koj tau txais OM3 nyob deb txwv tsis hais ntau npaum li cas OM4 nyob rau hauv txoj kev. Ib qho OM3 thaj qaum nyob rau hauv ib qho kev txwv tag nrho -OM4 khiav txwv tag nrho.
Q: Kuv 100G Txuas yog 90 Meters. OM3 lossis OM4?
A: Yog tias nws yog 100GBASE-SR4 (qhov ib txwm muaj), OM3 tsuas yog txhawb nqa 70 meters. Koj xav tau OM4. Yog tias koj siv 100GBASE-SR10, OM3 nce mus txog 100 meters-tab sis SR10 tsis tshua muaj. Xav tias SR4 tshwj tsis yog koj paub lwm yam.
Q: Kuv Puas Yuav Hloov Ua Haujlwm OM3 Infrastructure Nrog OM4?
A: Feem ntau tsis yog. Yog tias OM3 ua tau raws li koj qhov kev xav tau tam sim no thiab kev ncua deb, hloov pauv ntxiv tus nqi yam tsis muaj txiaj ntsig. Xav txog OM4 rau kev ntxiv tshiab lossis thaum hloov kho kom nrawm dua qhov twg OM3 txwv tsis pub dhau.
Q: Tus nqi sib txawv yog dab tsi?
A: Rau patch cords: tsawg, feem ntau qis dua 10%. Rau lub cev cables: OM4 khiav roughly 15-30% siab dua nyob ntawm qhov ntev thiab fiber ntau suav. Qhov feem pua tseem ceeb tsawg dua seb puas muaj peev xwm ncav cuag tau muaj txiaj ntsig zoo rau koj qhov kev xa tawm.
Q: Puas yog OM4 Yuav Tsum Tau Txais Cov Transceivers sib txawv?
A: Tsis yog. Transceivers tsis paub lossis tsis quav ntsej txog qib fiber ntau- lawv xa thiab tau txais 850nm lub teeb txawm li cas los xij. Hom fiber ntau txiav txim siab seb lub teeb mus deb npaum li cas, tsis yog qhov transceiver koj siv.
Kab hauv qab
OM3 tseem yog ib qho kev xaiv zoo rau 10GbE kev xa tawm hauv 300 meters- uas suav nrog feem ntau ntawm cov lag luam LAN xwm txheej. OM4 ua pov thawj nws tus nqi zoo thaum koj tab tom xa 40G / 100G txuas, thaum khiav dhau OM3 qhov kev txwv deb, lossis thaum koj xav tau lub taub hau rau kev hloov kho ceev yav tom ntej yam tsis tau rov ua dua.
Qhov yuam kev loj tshaj yog tsis xaiv qhov tsis ncaj ncees lawm qib. Lawv tab tom yuam kev multimode qhov twg ib zaug - hom ua rau muaj kev nkag siab ntau dua, sib xyaw cov fiber ntau tsis sib xws, lossis saib MPO polarity hauv kev xa mus rau optics. Tau txais cov cai ntawd, thiab qhov kev txiav txim siab OM3/OM4 ua ncaj nraim.
Xav tau kev pab speccing fiber ntau rau ib qhov project tshwj xeeb? Peb pab neeg ua haujlwm tuaj yeem tshuaj xyuas koj qhov kev ncua deb thiab pom zoo kom muaj kev sib xyaw ua ke ntawmmultimode fiber ntau hom, connector configurations, thiab lub cev / thaj sib dhos.
