10GBASE LR Transceivers Ua tau raws li tus qauv Fiber

 

Vim li cas G.652 Fiber tseem ceeb dua li koj xav

 

Saib, Kuv tau pom ntau qhov kev xa tawm qhov twg ib tus neeg rub txawm tias fiber ntau cable tshwm sim hauv lub tsev khaws khoom. Kev txav tsis zoo. 10 gbase lrtransceivertshwj xeeb yuav tsum muaj tus qauv ib zaug - hom fiber ntau ua raws li ITU-T G.652 cov lus pom zoo. Qhov no tsis yog qhov tsis txaus ntseeg bureaucratic tsis txaus ntseeg - cov yam ntxwv chromatic dispersion ntawm G.652 fiber ncaj qha cuam tshuam cov teeb liab kev ncaj ncees ntawm 10.3125 Gbps kab tus nqi.

G.652 fiber ntau muaj 9/125 μm core / cladding configuration. Cov tub ntxhais txoj kab uas hla nqaim yuam lub teeb kom nthuav tawm hauv ib hom, tshem tawm cov teeb meem sib txawv ncua sij hawm uas plague multimode installation. Koj tab tom saib ze li ntawm 18 ps / (nm·km) chromatic dispersion ntawm 1310nm, uas DFB laser qhov chaw hauv koj 10G LR optical module tuaj yeem ua haujlwm yam tsis tas yuav muaj kev cuam tshuam sab nraud. Sim rub tawm nrog OM3 cable tshaj 300 meters.

Qee tus neeg muag khoom thawb "hwm" fiber ntau xaiv. Cuaj zaug ntawm kaum, tus qauv G.652D tuav txhua yam hauv lub tsev kawm ntawv metro cuam tshuam rau nws.

 

SFF-8431 thiab Lub Cev Txheej Txheem Tes Tes

 

Dab tsi MSA tsis qhia koj: thermal kev ua tau zoo sib txawv ntawm cov tuam ntxhab.

Ib qho kev tsim tsis zoo TO- tuaj yeem ntim cov khoom pov tseg rau hauv lub tshuab ua cua sov hauv txoj hauv kev uas tuaj yeem thawb cov chaw nres nkoj nyob sib ze mus rau thermal throttling. Cov neeg muag khoom raug cai hais txog kev khiav hauj lwm kub ntawm 0℃mus rau 70℃rau kev lag luam-qib units, nrog rau kev lag luam variants xws li SFP-10G-LR-Kuv txuas mus rau -40℃. Qhov sib txuas qhov kub hauv qhov me me qhov muag pom tau tuaj yeem nce siab 30 degrees saum toj ib puag ncig. Thaum tshav kub kub dissipation tsis yog xaiv tau - nws yog qhov sib txawv ntawm kev xa tawm tsib xyoos thiab kev lees paub tom qab kaum yim lub hlis.

 

IEEE 802.3ae: Cov ntaub ntawv Foundation

 

Thaum 802.3ae poob rau xyoo 2002, lub ntiaj teb kev sib txuas lus tseem tab tom qhwv nws lub taub hau ntawm kev xa tawm gigabit. Cov pab pawg ua haujlwm tau tswj hwm qee yam zoo kawg nkaus: lawv txhais cov txheej txheem lub cev sib txawv ntawm 850nm multimode los ntawm 1550nm txuas ntxiv - mus txog ib qho - hom, txhua qhov sib koom ua ke 64b / 66b encoding scheme ntawm PCS txheej.

Clause 49 tuav lub cev coding sublayer. Clause 52 qhia txog PMD cov yam ntxwv rau LR modules. Kev ua tau zoo encoding tau txhim kho zoo dua li 8b / 10b cov phiaj xwm los ntawm gigabit Ethernet- nyiaj siv ua haujlwm poob los ntawm 25% mus rau kwv yees li 3%. Qhov kev ua tau zoo tau nce ib feem piav qhia vim li cas 10G optics tswj cov peev nyiaj tsim nyog txawm hais tias muaj ntau dua bandwidth nce.

Qhov tsawg kawg nkaus cabling nrug tau teev tseg hauv 802.3ae zaum ntawm 2 meters. Zoo li tsis tseem ceeb, tab sis muaj qhov laj thawj kho qhov muag tom qab nws. Ntawm qhov deb heev, tau txais lub hwj chim tuaj yeem tshaj qhov ntsuas qhov ntsuas qhov ntsuas saturation. 10gbase lr transceiver laser tso zis feem ntau ntsuas ntawm -8.2 dBm thiab +0.5 dBm. Txais rhiab heev mus rau -14.4 dBm. Ntawm 3-meter thaj qaum, koj tab tom saib tej zaum 0.5 dB ntawm kev nkag tsis tau-ntau ntawm cov npoo ua ntej koj tsoo qhov -14.4 dBm pem teb, tab sis muaj feem cuam tshuam rau qhov siab kawg yam tsis muaj kev sib txuas tsim nyog.

 

Kev Siv DOM: SFF-8472 hauv Kev Xyaum

 

Digital Optical Monitoring transformed transceiver troubleshooting. SFF-8472 specification lays tawm ob -wire serial interface-tseem ceeb I²C ntawm module tswj tus pins. Koj 10G ntev mus txog transceiver qhia tsib yam tseem ceeb: TX tso zis zog, RX input zog, laser bias tam sim no, mov voltage, thiab kub sab hauv.

Tus nqi tiag - ntiaj teb no? Thaum lub sij hawm metro nplhaib xa tawm tsis ntev los no, DOM kev nyeem ntawv qhia txog qhov tsis ncaj ncees tam sim no ntawm ib qho ua ntej cov tsos mob tshwm sim. Lub laser tau degrading -kev tsis txaus siab them nyiaj tau thawb los ntawm ib txwm 25mA mus rau lub tswb ntsuas ntawm 70mA. Peb hloov lub module thaum lub sij hawm tu ncua es tsis txhob teb rau 2 AM outage call.

Tsis yog txhua tus neeg muag khoom siv DOM sib npaug. Qee qhov qhia txog lub zog kho qhov muag nrog ± 3 dB qhov tseeb; Cov tuam txhab ua tau zoo ua tiav ± 1 dB. Qhov sib txawv tseem ceeb thaum koj tab tom sim cais seb qhov teeb meem kev ua tau zoo los ntawm lub transmitter, receiver, lossis fiber ntau cog. Calibration cov ntaub ntawv nyob rau hauv module EEPROM- pheej yig clones qee zaum nkoj nrog cov txiaj ntsig zoo uas dais me ntsis kev sib raug zoo rau cov khoom siv tiag tiag.

 

 

Cov lus nug Wavelength: Vim li cas 1310nm

 

Kev txiav txim siab engineering tom qab 1310nm xaiv taug qab rov qab mus rau silica fiber cov yam ntxwv attenuation. Tib - hom fiber ntau nthuav tawm ob lub qhov rais kis tau tus mob: kwv yees li 1310nm thiab 1550nm. Ob leeg zaum hauv qis- thaj tsam attenuation, tab sis 1310nm coincides nrog xoom-dispersion wavelength rau tus qauv SMF.

Lub 10GBASE-ER thiab 10GBASE-ZR variants siv 1550nm vim tias ntev mus txog qhov xav tau qis qis qis (ze li 0.2 dB/km piv rau 0.35 dB/km ntawm 1310nm). Kev lag luam koom nrog chromatic dispersion tswj-1550nm kis tau tus mob hla 40km ntawm G.652 fiber ntau khaws cov mem tes dav dav yam tsis muaj kev them nyiaj rau cov txheej txheem.

Rau 10km txuas, lej ua haujlwm tawm hauv 1310nm qhov kev pom zoo. Koj qhov 10gbase lr transceiver module zam kev sib cais- hloov pauv cov kev xav tau ntawm fiber ntau thaum tseem xa cov txiaj ntsig poob. Cov pob txha hauv tsev kawm ntawv, cov chaw cia khoom sib txuas, cov xov tooj cua nkag tau yooj yim- cov ntawv thov no tsis tshua pom tseeb tus nqi them nqi ntawm 1550nm txuas ntxiv - ncav cuag optics.

 

Tswvyim Deployment Scenarios

 

Data center interconnects ntawm cov tsev nyob ib sab. Enterprise tsev kawm ntawv aggregation. Cov no sawv cev rau qhob cij-thiab-butter 10GBASE-LR daim ntawv thov. Txuas qhov kev ncua deb feem ntau poob ntawm 500 meters thiab 5 kilometers -zoo nyob rau hauv spec tab sis dhau ntau qhov kev txwv ntau hom.

Kuv khaws ib daim ntawv teev cov ntawv txuas mus rau kev suav nyiaj txiag rau cov xwm txheej sib xws. 6km khiav siv OS2 fiber (0.4 dB / km ntawm 1310nm) nrog plaub LC thaj vaj huam sib luag (0.3 dB ib khub niam txiv) nthuav tawm:

Fiber attenuation: 6 × 0.4=2.4 dB Connector poob: 4 × 0.3=1.2 dB Splice allowance: 0.5 dB Total: 4.1 dB

Tawm tsam 10G LR module lub zog peev ntawm kwv yees li 6.2 dB (transmitter yam tsawg kawg nkaus -8.2 dBm rau receiver rhiab heev -14.4 dBm), koj tuav 2 dB npoo. Tsim nyog rau feem ntau ib puag ncig, tab sis kuv xav kom ze rau 3 dB yog tias cov fiber ntau khiav los ntawm qhov chaw kub thiab txias xws li chaw nres tsheb.

 

Compatibility Realities hauv Multi-Vendor Networks

 

SFP + MSA yuav tsum tau lees tias ntsaws- thiab - ua si sib cuam tshuam. Kev muaj tiag proves messier.

Cisco modules muaj cov ntaub ntawv qhia txog tus kheej uas qee qhov hloov firmware validates ua ntej qhib cov chaw nres nkoj. Thib peb -party 10gbase-lr sfp+ transceivers xav tau cov neeg muag khoom tshwj xeeb coding kom dhau cov tshev no. Generic modules ua haujlwm zoo ntawm cov platforms los ntawm Juniper, Arista, lossis Ubiquiti uas tsis tswj hwm OEM txwv.

Kev ntsuam xyuas tseem ceeb. Reputable lwm manufacturers tuav compatibility labs nrog cov cuab yeej los ntawm cov neeg muag khoom loj. Lawv yuav qhia meej txog cov qauv hloov pauv twg thiab cov kev hloov kho firmware uas lawv tau lees paub- tsis yog thov "Cisco tshaj" yam tsis muaj pov thawj. Tus nqi sib txawv ntawm OEM thiab thib peb - tog tuaj yeem tshaj 80%. Qhov kev khaws nyiaj ntawd tau txais nyiaj ntau ntawm cov khoom lag luam me me, piv txwv tias koj tau txheeb xyuas qhov ua tau zoo ua ntej.

Kuv tus kheej tau khiav FS.COM thiab StarTech modules nrog Cisco-branded optics nyob rau hauv ntau lawm. Functionally zoo tib yam. DOM qhia ua haujlwm. Lub networking hardware tsis tuaj yeem qhia qhov txawv thaum lub sijhawm ua haujlwm ib txwm muaj. Warranty cuam tshuam sib txawv los ntawm cov khoom muag khoom txoj cai.

 

 

Kub thiab Environmental Considerations

 

Txuj kev lag luam -qib SFP + modules qhia 0-70℃kev khiav hauj lwm ntau yam. Muaj kev sib txawv ntawm -40℃txog +85℃. Qhov sib txawv tseem ceeb rau kev xa mus rau tej thaj chaw deb, lub tsev hu xov tooj, lossis kev teeb tsa yam tsis muaj kev tswj hwm huab cua.

Hauv 10G optical transceiver, DFB laser qhov pib tam sim no qhia txog qhov kub thiab txias rhiab heev. Qhov chaw txias txias txo qhov pib tam sim no tab sis tuaj yeem ua rau hom -hopping instabilities. Ib puag ncig kub thawb qhov pib tam sim no siab dua, ua kom cov txheej txheem kev laus sai. Tsis siv neeg fais fab tswj circuits them nyiaj nyob rau hauv kev txwv tsim -dhau li cov kev txwv thiab optical outputs wanders sab nraum specification.

Cov txee sab nraum zoov hauv Arizona lub caij ntuj sov niaj hnub ntaus 50℃sab hauv kub. Yog tsis muaj kev lag luam- ntsuas cov qauv, koj tab tom twv txiaj ntawm transceiver ntev. Tus nqi nce ntxiv rau I-temp qhov chaw-tej zaum $20-30 rau ib qho module-yuav kev txhim kho kev ntseeg tau ntau heev.

 

FCoE thiab raws tu qauv txhawb nqa

 

Nov yog qee yam uas ntes tib neeg: tsis yog tag nrho 10GBASE-LR modules txhawb Fiber Channel hla Ethernet. Cisco SFP-10G-LR-S datasheet qhia meej meej tias FCoE incompatibility. Yog tias koj qhov chaw cia khoom network xav tau FCoE encapsulation, xyuas cov txheej txheem kev txhawb nqa ua ntej yuav khoom.

Standard 10GbE framing txawv ntawm FC primitive sequences. Modules optimized tshwj xeeb rau Ethernet tej zaum yuav tsis ua raws li cov qauv sib txawv ntawm cov tsheb sib txawv thiab lub sijhawm yuav tsum tau ua ntawm cov txheej txheem khaws cia. Qhov no tsis muaj teeb meem tsawg dua hauv cov kev sib txuas IP ntshiab, tseem ceeb hauv cov ntaub ntawv chaw sib koom ua ke.

 

Txuas kev ncaj ncees thiab ntsis yuam kev tus nqi

 

IEEE 802.3ae qhia 10^-12 BER raws li kev ua haujlwm hauv pem teb. Niaj hnub no 10gbase lr transceiver kev ua haujlwm niaj hnub ua tiav zoo dua-10^-15 tsis yog qhov txawv ntawm cov xwm txheej zoo. Kev ua yuam kev ntawm qib no ua rau Ethernet zoo lossless rau cov hom phiaj siv tau.

Qhov twg koj pom BER degradation: qias neeg fiber ntau connectors (tshuaj xyuas ua ntej txhua qhov ntxig), tshaj khoov vojvoog, tsis zoo splices, los yog transmitter aging. Ib tus ntiv tes nkaus xwb ntawm LC ferrule tuaj yeem ua rau 0.5-1.0 dB poob ntxiv. Sib npaug hla ntau txoj hauv kev thiab mam li nco dheev koj cov peev nyiaj txuas ploj mus.

Kuv khaws IPA cov ntaub so hauv txhua lub cuab yeej. Tsib vib nas this ntawm kev sib txuas tu tiv thaiv cov sij hawm ntawm kev daws teeb meem.

 

Ordering thiab Specification Reference

 

Thaum muab 10G LR optical modules, cov kev txwv no yuav tsum tshwm sim ntawm koj daim ntawv teev npe:

IEEE 802.3ae 10GBASE-LR ua raws

SFF-8431 mechanical / hluav taws xob ua raws

SFF-8472 DOM kev txhawb nqa (Rev 12.0 lossis tom qab nyiam dua)

Kev khiav hauj lwm qhov kub thiab txias

Fais fab kis: -8.2 rau +0.5 dBm yam tsawg kawg nkaus spec

Txais rhiab heev: -14.4 dBm lossis zoo dua

Wavelength: 1260-1355nm (1310nm nominal)

Connector: Duplex LC / UPC

Qhov sib txawv ntawm cov neeg txais kev xav ntawm cov neeg tsim khoom tuaj yeem hla ntau dB. Hwm modules yuav muab -17 dBm rhiab heev, txuas cov tswv yim txuas mus deb tshaj qhov nominal 10km specification. Seb qhov tseem ceeb yog nyob ntawm koj cov nroj tsuag fiber ntau.

 

Kev soj ntsuam zaum kawg

 

Lub 10GBASE-LR transceiver nyob rau hauv ib qho kev paub tab technology niche. Kaum tsib xyoos ntawm kev ua kom zoo tshaj plaws tau tsim cov qauv tsim nyog, pheej yig los ntawm ntau qhov chaw tsim nyog. Kev ua raws li cov qauv ua kom muaj kev sib cuam tshuam; Digital Optical Monitoring muab kev pom; thermal engineering txiav txim siab lub neej.

Dab tsi ua rau kuv xav tsis thoob: ntau npaum li cas cov neeg siv khoom siv tsis tau cov peev txheej fiber ntau uas twb muaj lawm. Ib qho -hom nroj tsuag txhawb nqa 10G-LR hnub no tuaj yeem nqa 25G-LR lossis txawm tias 100G-DR cov teeb liab nrog kev hloov pauv hloov tsim nyog. Fiber nws tus kheej outlass ntau tiam khoom siv. Kev nqis peev hauv kev txhim kho kev ua tau zoo- kev tswj cov kab hluav taws xob kom zoo, cov ntaub ntawv poob splice, kev txheeb xyuas qhov huv ntawm cov khoom sib txuas{11}} them cov nyiaj faib tawm thoob plaws kaum xyoo- ntxiv rau cov txheej txheem kev ua neej nyob.

Xaiv cov transceivers uas phim koj cov kev xav tau tiag tiag. Txheeb xyuas thib peb- tog sib raug zoo ua ntej xa mus. Saib xyuas DOM tsis muaj. Ntxuav koj cov connectors. Tus so loj saib xyuas nws tus kheej.