10GBASE SFP + Txhawb Kev Sib Tw & Fiber Hom

 

SR Zaj Dab Neeg (thiab Vim Li Cas OM3 / OM4 Qhov Tseem Ceeb)

 

Txhua tus pib nrog10GBASE-SR. Nws yog pheej yig, nws ua haujlwm, thiab 850nm VCSELs tau nyob ib puag ncig mus ib txhis. Tab sis ntawm no yog qhov chaw uas tau nthuav tawm - thiab qhov twg kuv tau pom ntau qhov kev xa tawm yuam kev.

Qhov kev ntsuam xyuas nyob deb koj pom ntawm cov ntaub ntawv xav tias cov xwm txheej zoo meej . 300 meters ntawm OM3, 400 meters ntawm OM4. Tseeb. Tab sis cov lej no yog los ntawm kev tswj hwm ib puag ncig nrog cov fiber ntau tshiab thiab cov khoom sib txuas huv. Lub ntiaj teb tiag? Koj tab tom cuam tshuam nrog thaj chaw uas tsis tau raug ntxuav txij li xyoo 2015, khoov lub vojvoog ua txhaum cai muab zais rau hauv cov tais cable, thiab qhov kev sib txuas ib tus neeg tau ua thaum 2 teev sawv ntxov thaum lub qhov rais saib xyuas.

OM1 thiab OM2 tseem nyob ntawd, los ntawm txoj kev. Cov tsev kawm ntawv qub txeeg qub teg, cov ntaub ntawv qub qub uas tsis tau rov siv dua. Ntawm OM1 (62.5μm core), koj tab tom saib tej zaum 33 meters. OM2 tau txais koj mus rau 82 meters. Tsis zoo. Lub modal bandwidth tsuas yog tsis nyob ntawd-500 MHz ·km rau OM2 piv rau 2000 MHz ·km rau OM3. Qhov sib txawv tseem ceeb heev ntawm 10G speeds qhov twg modal dispersion dhau los ua qhov txwv tsis pub tshaj li qhov txo qis.

 

LR thiab Tib -Mode Transition

10GBASE-LR ua haujlwm ntawm 1310nm dhau ib zaug - hom fiber ntau. Kaum kilometers. Qhov ntawd yog qhov spec. Hauv kev xyaum, nrog cov fiber ntau zoo thiab cov phiaj xwm sib txuas tsim nyog, qee qhov kev xa tawm thawb nws ntxiv -Kuv tus kheej tau lees paub qhov txuas ntawm 12-13km nrog cov npoo txaus, txawm hais tias qhov no tsis muaj kev lav phib xaub thaj chaw thiab tsis yog ib yam uas koj xav sau ua ntaub ntawv.

Kev dhia los ntawm ntau hom mus rau ib leeg - hom sawv cev ntau dua li kev hloov kho nyob deb. Koj tsiv ntawm 50μm lossis 62.5μm cores mus rau 9μm. Kev sib haum xeeb ntawm kev sib haum xeeb thaum lub sij hawm txiav tawm ua qhov tseem ceeb dua. Cov Connectors tseem ceeb dua. Cov hom polish tseem ceeb -PC, UPC, APC txhua tus coj txawv txawv. Rau cov ntawv thov LR, koj feem ntau xav tau UPC txuas; lub tiaj polish ua haujlwm zoo ntawm 1310nm qhov rov qab-kev xav tsis zoo li kev puas tsuaj vim nws dhau los ntawm 1550nm.

Dab tsi tsis muaj leej twg qhia rau koj: cov fiber ntau nws tus kheej yog pheej yig dua ib 'meter' rau ib hom -. Tus nqi sib txawv yog los ntawm cov khoom siv txiav thiab cov transceivers lawv tus kheej. Ib qho SR module khiav tej zaum $30-50 los ntawm cov neeg muab khoom muaj npe thib peb. LR? Triple ntawd, yam tsawg kawg nkaus.

 

ER thiab ZR: Thaum Distance Tau Loj

40 kilometers rau 10GBASE-ER. 80+ kilometers rau ZR. Cov no yog 1550nm optics, thiab lawv yog cov tsiaj nyaum sib txawv kiag li.

Cov peev nyiaj siv hluav taws xob muaj ntau heev -ER feem ntau qhia txog +4 dBm tso tawm lub zog nrog cov neeg txais rhiab heev ntawm -15.8 dBm, muab rau koj kwv yees li 20dB ua haujlwm nrog. ZR thawb qhov no ntxiv nrog ntau dua - lasers muaj zog thiab ntau dua APD receivers. Tab sis nyiaj txiag hwj chim ib leeg tsis qhia tag nrho zaj dab neeg. Ntawm qhov kev ncua deb, chromatic dispersion accumulates. Lub qhov rais 1550nm zaum nyob qhov twg dispersion-hloov fiber ntau yuav tsum daws txhua yam (nws tsis yog, tab sis qhov ntawd yog qhov sib txawv ntawm G.653 thiab vim li cas nws thiaj li tsis siv tam sim no rau DWDM).

Standard G.652 ib leeg- hom muaj chromatic dispersion nyob ib ncig ntawm 17 ps/(nm·km) ntawm 1550nm. Tshaj 80 km, uas ntxiv. ZR optics suav nrog kev them nyiaj hluav taws xob dispersion los daws qhov no, uas yog ib feem ntawm vim li cas lawv raug nqi dab tsi.

Ua siab ncaj? Yog tias koj tab tom saib ZR nyob deb, koj yuav tsum tau soj ntsuam kev sib txuas lus optics lossis DWDM cov kev daws teeb meem. Tus nqi them nqi rau ZR tau poob qis dua piv rau kev nkag- theem sib txuam hauv xyoo tas los no.

 

LRM: Tus Qauv Tsis Nco Qab

10GBASE-LRM muaj nyob . 220 meters tshaj legacy multimode siv 1310nm. Nws tau tsim los rau FDDI-qib kev teeb tsa- cov tsev qub nrog OM1 fiber ntau uas tsis tuaj yeem hloov pauv kev lag luam.

Kuv tab tom hais txog nws kom tiav. Hauv 15 xyoo ntawm kev tsim network engineering, kuv tau siv LRM raws nraim ob zaug. Ob lub sijhawm hauv tsev kawm ntawv qib siab los ntawm xyoo 1980s qhov twg cov kav dej ua haujlwm tau rub cov fiber ntau txwv tsis pub kim. Cov thev naus laus zis ua haujlwm los ntawm kev them nyiaj hluav taws xob dispersion nyob rau hauv txoj kev tau txais, qhov tseem ceeb ntawm kev tu lub modal mess uas 1310nm kis tau tus mob tsim nyob rau hauv multimode fiber.

Yog tias koj muaj kev xaiv, tsis txhob siv LRM. Tsuas yog pob nyiaj siv rau kev hloov fiber ntau.

 

Link Budget: Lej Tsis Muaj Leej Twg Xav Ua

Ntawm no yog ib qho kev kuaj xyuas qhov tseeb ceev:

Available margin=Tx power − Rx rhiab heev − fiber attenuation − connector losses − splice losses − safe margin

 

Rau ib tug raug LR xa mus tshaj 8km nrog plaub mated connector khub:

 

 

Daim duab 0.35 dB / km yog kev saib xyuas rau niaj hnub OS2 fiber ntau ntawm 1310nm. Qee tus installers hais 0.4 dB / km rau pad lawv cov lej. G.652.D fiber ntau ntsuas ib ncig ntawm 0.32-0.34 dB / km thaum tshiab.

Ntawm 1550nm (ER / ZR thaj chaw), attenuation poob rau kwv yees li 0.22 dB / km. Qhov no yog vim li cas kev ncav cuag ntev dua txawm tias muaj kev sib tw dispersion.

 

 

Kev Siv Ceev (Vim qee zaus koj tsuas xav tau tus lej)

 

 

Compatibility thiab Thib Peb-Cov Lus Nug

Txhua tus neeg muag khoom hloov pauv loj-Cisco, Juniper, Arista, HPE- siv qee hom kev lees paub transceiver. Cisco's yog qhov nruj tshaj plaws; Qee qhov IOS versions yuav tsis lees txais cov chaw nres nkoj uas tsis yog -TAA- ua raws li optics. Juniper nyiam sau cov lus ceeb toom tab sis ua haujlwm. Arista feem ntau tso cai.

Thib peb -Optics ua haujlwm zoo nyob rau hauv feem ntau. Cov tuam txhab xws li Finisar (tam sim no II-VI), Lumentum, thiab ntau yam xim dawb-label manufacturers tsim tib silicon uas xaus rau hauv OEM modules. Tus nqi koj them rau Cisco-branded optics feem ntau yog lub logo thiab kev txhawb nqa.

Qhov ntawd hais tias -thiab qhov no tseem ceeb rau kev xa khoom lag luam- siv thib peb - tog optics feem ntau ua rau cov neeg muag khoom txhawb nqa rau qhov txuas - theem teeb meem. Yog tias koj qhib TAC rooj plaub rau pob ntawv poob thiab lawv pom tias koj tab tom khiav FS.COM transceivers, kev sib tham yuav nyuaj.

DDM (Digital Diagnostic Monitoring) muab lub sijhawm tiag tiag - telemetry tsis hais tus neeg muag khoom. Kub, Tx zog, Rx zog, bias tam sim no, voltage. Txhua niaj hnub SFP + txhawb nws ib SFF-8472. Siv nws. Cov ntaub ntawv qhia rau koj thaum tej yam tsis zoo ua ntej lawv ua tsis tiav.

 

BiDi, CWDM, thiab lwm yam variants

Tsim nyog hais: tsis yog tag nrho 10G SFP + modules yog cov ntsiab lus yooj yim -rau - taw tes. BiDi transceivers siv WDM hauv ib qho fiber ntau strand- feem ntau 1270nm / 1330nm khub rau 10km BiDi-LR daim ntawv thov. Ib nrab koj suav fiber ntau. Pab tau thaum koj khiav qis ntawm cov fiber ntau tsaus nti hauv cov kav dej uas twb muaj lawm.

CWDM thiab DWDM SFP + modules multiplex ntau 10G raws tshaj ib khub fiber ntau. CWDM siv 20nm qhov sib nrug (txog 18 txoj kev xyaum), DWDM siv 0.8nm sib nrug (80+ channels). Cov no tsis yog hloov pauv rau koj tus qauv LR module-lawv yog cov tshuab- theem kev txiav txim siab uas suav nrog cov khoom siv mux/demux, kev npaj wavelength, thiab feem ntau yog kev sib tham ntawm cov neeg muag khoom.

 

Kev xav zaum kawg

Cov kev qhia tshwj xeeb muaj nyob rau vim li cas, tab sis fiber ntau tes hauj lwm tseem ua rau lub cev tawv. Plua plav ntawm qhov kawg ntxiv 0.5dB. A 15mm khoov vojvoog (spec hais tias 30mm) qhia macro- khoov poob koj yuav tsis pom ntawm ib daim ntawv teev cov ntaub ntawv. Uas fusion splice ua nyob rau hauv lub teb yeej tsis heev match Hoobkas pigtails.

Ntsuam xyuas txhua yam. Ntseeg tsis muaj dab tsi. Khaws koj cov khoom siv tu kom ruaj khov.