SFP transceivers ib hom ua haujlwm ntev

 

Yog tias koj tau sim khiav fiber ntau hla ib lub tsev kawm ntawv lossis nruab nrab ntawm lub tsev ob peb mais sib nrug, koj twb paub tias multimode yuav tsis txiav nws. Lub teeb liab tsuas poob sib nrug. Qhov ntawd yog qhov twg tib homSFP transceiverstuaj rau hauv -thiab ncaj ncees, thaum koj nkag siab tias vim li cas lawv ua haujlwm li lawv ua, nws hloov pauv koj xav li cas txog kev tsim kho network tag nrho.

 

 

Vim Li Cas Ib Hom Mus Ntxiv (The Short Version)

 

Lub hauv paus yog me me. Zoo li, me me tiag tiag - nyob ib ncig ntawm 9 microns. Muab piv rau multimode's 50 lossis 62.5 microns thiab koj pib pom daim duab.

Dab tsi tshwm sim nrog cov tub ntxhais me me yog lub teeb pib taug kev hauv ib txoj kev. Ib hom. Tsis bouncing ib ncig, tsis muaj modal dispersion noj koj lub teeb liab ciaj sia nyob deb. Lub 1310nm laser tua ncaj qha los ntawm thiab ua kom nws txoj kev ncaj ncees rau 10, 20, txawm 80 kilometers nyob ntawm seb dab tsitransceiverkoj ua haujlwm nrog.

Multimode? Zoo heev rau chav server. Txaus ntshai rau ib yam dab tsi dhau los 500 meters los yog li ntawd.

 

Yam Dab Tsi

 

Ntawm no yog qhov uas nws tau nthuav. Ib hom SFP modules feem ntau khiav ntawm 1310nm lossis 1550nm. Ob leeg yog infrared- pom tsis tau rau tib neeg lub qhov muag, pom tseeb -tab sis lawv coj txawv txawv hauv iav.

1310nm uazaum hauv qhov hu ua O-band. Chromatic dispersion yog yuav luag xoom ntawm lub wavelength no, uas zoo li kev lag luam hais lus kom txog thaum koj paub tias nws txhais tau tias koj lub teeb liab pulses tsis kis tawm thiab plooj ua ke nyob deb. Kev sib pauv? Me ntsis siab dua attenuation piv rau 1550nm. Koj tab tom saib roughly 0.35 dB ib kilometer poob.

1 550nmpoob qhov poob daim duab mus txog 0.2 dB / km. Tsawg zog poob txhais tau tias koj tuaj yeem thawb ntxiv -peb hais lus 40km, 80km, txawm 120km nrog cov cuab yeej zoo. Kev ntes yog koj xav tau zoo dua (nyeem: kim dua) lasers. Ib qho EML laser rau daim ntawv thov txuas ntxiv tsis pheej yig.

Feem ntau network engineers kuv tau tham rau default rau 1310nm rau txhua yam hauv qab 10km. Ua kom paub txog kev lag luam. Tsis tas li ntawd, 1550nm pib ua pov thawj nws cov nqi.

 

LR, ER, ZR-Qhov no txhais li cas tiag?

 

Cov tsiaj ntawv cov kua zaub ntawm SFP cov npe mus ncig ua si rau tib neeg mus tas li. Ntawm no yog qhov tawg tsis muaj fluff:

LR (Long Reach):10 kilometers ntawm ib hom fiber ntau. Qhov no yog koj tus neeg ua haujlwm rau kev sib koom ua ke - tsim kev sib txuas, kev sib txuas metro, yam li ntawd. Feem ntau siv 1310nm. Txhua tus neeg muag khoom loj-Cisco, Juniper, HP, thib peb- tog manufacturers- ua cov no.

ER (Ntxiv mus cuag):Push mus rau 40 km. Dhia mus rau 1550nm wavelength thiab siv cov lasers sab nraud hloov pauv hloov ncaj qha. Tus nqi pob yog pom tau.

ZR (Reach Ntev heev):80km ua. Tib 1550nm wavelength tab sis nrog nruj dua kam rau ua thiab zoo dua receivers. Tsis yog tus qauv IEEE tiag tiag, nthuav dav - nws yog ib qho kev sib cog lus kev lag luam. Txawm li cas los xij, kev sib raug zoo yog qhov ruaj khov ntawm cov neeg muag khoom yog tias koj ua raws li MSA- ua raws cov qauv.

Kuj tseem muaj EZR rau 120km thiab dhau mus, tab sis thaum lub sijhawm ntawd koj feem ntau saib DWDM systems thiab optical amplifiers. Sib txawv ballgame nkaus.

 

Tiag -Cov Lus Qhia Txog Kev Teeb Meem Ntiaj Teb

 

Okay, yog li koj tau txais koj 10G LR SFP + modules thiab ob peb mais ntawm ib hom fiber ntau los khiav. Ob peb yam uas tsis muaj leej twg qhia koj ua ntej:

Qhov tsawg kawg nkaus cable nrug tseem ceeb. Zoo li counterintuitive-vim li cas thiaj yuav muajyam tsawg kawg nkaus? Tab sis yog tias koj cov fiber ntau khiav luv dhau (hauv qab 2 meters), lub teeb liab tau txais yuav ua tau dhau lub tshuab ntes. Qee qhov kev teeb tsa xav tau inline attenuators thaum txuas cov cuab yeej hauv tib lub khib ntawm ib hom. Kuv tau pom techs siv sij hawm los daws teeb meem "phem" transceivers uas zoo -tsuas yog lub zog ntau dhau los ntaus tus txais.

Ntxuav koj cov connectors. Ib txwm. Cov plua plav plua plav ntawm LC ferrule tsis quav ntsej tias koj siv $ 300 ntawm lub tshuab xa hluav taws xob. Lub teeb liab degrades ib yam nkaus. IPA cov ntaub so thiab tshuaj ntsuam xyuas tsis yog xaiv tau.

Tsis tas li ntawd -thiab qhov no hlawv kuv ib zaug -tsis txhob sib xyaw APC thiab UPC connectors. Lub kaum sab xis ntawm APC connectors qhia lub teeb sib txawv. Mating lawv nrog UPC tsim qhov sib txawv ntawm huab cua uas tso koj cov peev nyiaj hluav taws xob tam sim ntawd. Cov xim coding muaj tshwm sim vim li cas (ntsuab rau APC, xiav rau UPC), tab sis nyob rau hauv dim server chav yuam kev tshwm sim.

 

 

Digital Diagnostics: Siv tau tiag tiag

 

Niaj hnub SFP modules txhawb qee yam hu ua DDM lossis DOM (Digital Diagnostics Monitoring). Lub transceiver nws tus kheej qhia txog qhov kub thiab txias, muab hluav taws xob, laser bias tam sim no, xa hluav taws xob, thiab tau txais lub zog ntawm lub sijhawm tiag tiag -.

Qhov no tsis yog qhov zoo xwb - rau- muaj. Thaum qhov txuas pib ua yeeb yam tsis zoo, DOM nyeem ntawv qhia koj seb koj puas cuam tshuam nrog lub laser tuag, ib qho khoom siv qias neeg, lossis teeb meem fiber ntau nyob rau hauv txoj kev. Hloov lub zog poob rau lub sijhawm? Laser degradation. Tau txais lub zog poob tam sim ntawd? Ib tug neeg tej zaum kinked cov fiber ntau khiav tshiab cables los ntawm ib tug conduit.

Tus qauv SFF-8472 txhais li cas qhov no ua haujlwm. Feem ntau cov keyboards tswj tau tuaj yeem txheeb xyuas cov txiaj ntsig no los ntawm SNMP lossis lawv CLI. Yog tias koj pawg saib xyuas tsis sau DOM metrics, koj tab tom ya dig muag ntawm kev kho qhov muag.

 

Tus neeg muag khoom xauv-Hauv (lossis Tsis yog)

 

Cisco muag SFPs uas tsuas yog ua haujlwm hauv Cisco iav. Yog li ua Juniper thiab HP. Cov modules xyuas cov neeg muag khoom- tshwj xeeb coding thaum muab tso rau.

Tab sis ntawm no yog qhov khoom: lub hauv paus thev naus laus zis tau tsim los ntawm Multi-Source Agreement (MSA). Thib peb- tog manufacturers tsim cov qauv rau tib qhov tshwj xeeb, tom qab ntawd ua haujlwm rau lawv nrog cov lej muag khoom tsim nyog. Piv txwv li, Lantronix muag modules coded rau Cisco, Juniper, thiab HP compatibility.

Puas yog siv thib peb -tog optics ua rau koj daim ntawv cog lus txhawb nqa? Technically qee tus neeg muag khoom hais tias nws ua. Xyaum, kuv yeej tsis tau pom leej twg tau tsis lees txais kev txhawb nqa vim tias lawv siv cov transceivers sib xws. Koj qhov mileage yuav txawv. Tab sis tus nqi sib txawv-feem ntau 70-80% pheej yig dua OEM-ua rau nws tsim nyog xav txog.

Tsuas yog xyuas kom txhua yam koj yuav yog MSA- ua raws. Tsis muaj - lub npe modules los ntawm cov neeg xa khoom random tau ua rau mob taub hau xws li me me (DOM nyeem tsis raug) mus rau qhov loj (ua tiav qhov txuas tsis ua haujlwm hauv qab thauj khoom).

 

Kev ntsuas kub tseem ceeb tshaj qhov koj xav

 

Tus qauv coj mus muag transceivers ua haujlwm ntawm 0℃txog 70 degree. Qhov ntawd yog qhov zoo rau huab cua- tswj cov chaw khaws ntaub ntawv.

Muaj lossis hardened transceivers txuas ntxiv mus rau -40℃txog 85℃. Yog tias koj cov khoom siv nyob rau hauv ib qho chaw sab nraum zoov, lub Hoobkas hauv pem teb, lossis txhua qhov chaw uas tsis muaj HVAC ntseeg tau, cov no tsis xaiv tau. Tus nqi hwm yog tiag tiag-qee zaum 50% ntau dua-tab sis yog li yog tus nqi ntawm qhov chaw mus ntsib los hloov cov qauv uas tuag hauv qhov cua sov.

Transition Networks thiab Lantronix ob leeg muab kev lag luam - ntsuas ib hom transceivers. Cov specs saib zoo ib yam rau kev lag luam variants txwv tsis pub; nws yog tiag tiag txog kev xaiv cov khoom thiab kev sim ntawm qhov kub thiab txias.

 

Ceev Spec Reference

 

Tsis mus ua txuj tias qhov no yog tag nrho, tab sis rau kev siv ceev ntawm 10G ib hom modules:

Hom	Lub wavelength	Nyob deb	Fiber ntau	Kev siv yam
10GBASE-LR	1310nm ua	10km ua	9/125μm SMF	Campus, metro
10GBASE-ER	1 550nm	40km ua	9/125μm SMF	Metro, lub regional
10GBASE-ZR	1 550nm	80km ua	9/125μm SMF	Ntev -haul

Txhua tus siv LC duplex connectors. Txhua tus xav tau ib hom fiber ntau-tsis txhob sim patching cov no nrog txiv kab ntxwv multimode cables.

 

 

Ib Lo Lus ntawm BiDi Transceivers

 

Bidirectional SFPs (BiDi los yog WDM) siv ib qho fiber ntau strand tsis yog ib khub. Lawv kis ntawm ib lub wavelength thiab tau txais ntawm lwm qhov -feem ntau 1310nm / 1490nm lossis 1270nm / 1330nm ua ke. Ib tug multiplexer nyob rau hauv lub transceiver nws tus kheej tuav lub split.

Ib nrab koj suav fiber ntau. Doubles tus nqi ib transceiver, roughly. Txawm hais tias nws ua rau kev txiav txim siab nyob ntawm seb koj puas muaj fiber ntau - txwv lossis pob nyiaj - txwv. Hauv brownfield deployments nrog cov uas twb muaj lawm -strand khiav, BiDi yog qee zaum tsuas yog kev xaiv uas tsis cuam tshuam nrog rub cov kab tshiab.

 

Kev xav zaum kawg

 

Ib hom SFP transceivers tsis nyuaj thaum koj nkag siab txog lub hauv paus physics. Cov tub ntxhais me, ib txoj kev teeb pom kev zoo, infrared wavelengths xaiv tshwj xeeb rau cov yam ntxwv attenuation ntawm iav fiber. Tus so tsuas yog engineering variations nyob ib ncig ntawm cov hauv paus.

Rau feem ntau cov lag luam xa tawm, 10GBASE-LR ua haujlwm qhov kev ncua deb tau zoo kawg nkaus. Metro thiab regional networks thawb mus rau ER thiab ZR thaj chaw. Thiab yog hais tias ib tug neeg hais kom koj ncua 120 kilometers ... zoo, koj yuav xav pib tshawb fawb DWDM cov cuab yeej thiab kho qhov muag amplification, vim hais tias koj twb outgrown dab tsi ib tug transceiver muaj peev xwm ua tau.

Tau txais txoj cai hauv paus-cov khoom txuas huv si, hom fiber ntau, qhov kub thiab txias- cov qauv tsim nyog- thiab cov khoom no tsuas yog ua haujlwm xwb. Qee lub sij hawm rau ib xyoo caum ncaj tsis kov lawv.

Uas, ncaj ncees, yog qhov zoo network infrastructure yuav tsum ua.