Fiber Loopback Cable: Qhov Kev Ntsuas thiab Yuav Xaiv Li Cas

Yog tias koj ua haujlwm nrog optical transceivers, keyboards, lossis fiber ntau kuaj teeb, fiber ntau loopback cable yog ib qho ntawm cov cuab yeej siv tau zoo tshaj plaws uas koj tuaj yeem khaws ntawm tes. Nws tsim txoj hauv kev kaw qhov muag los ntawm kev xa cov teeb liab (Tx) rov qab mus rau qhov tau txais (Rx) sab ntawm tib lub cuab yeej - ua rau nws muaj txiaj ntsig zoo rau kev tshawb xyuas qhov chaw nres nkoj ceev, kev daws teeb meem ntawm transceiver, thiab kev sib cais hauv zos thaum lub sij hawm kuaj xyuas network.

Tab sis cov lus nug tiag tiag feem ntau engineers muaj tsis yog "Dab tsi yog fiber ntau loopback cable?" - nws yog "Dab tsi tuaj yeem ua pov thawj, nws qhov kev txwv yog dab tsi, thiab kuv yuav xaiv qhov tsim nyog rau kuv li cas?" Phau ntawv qhia no suav tag nrho cov no: kev sim ntsuas, kauj ruam-los ntawm- cov txheej txheem cov kauj ruam, cov txheej txheem xaiv, kev ua yuam kev, thiab thaum qhov ntsuas rov qab tsis txaus.
 

Dab tsi yog Fiber Loopback Cable?

Ib lub fiber ntau loopback cable - kuj hu ua lub loopback plug, loopback adapter, los yog fiber ntau loopback module - yog ib tug luv luv fiber optic los ua ke uas txuas cov kis tau tus mob thiab tau txais paths ntawm ib tug optical chaw nres nkoj kom lub teeb liab rov qab mus rau tib lub cuab yeej. Nws tsis yog cov khoom siv cable. Nws lub hom phiaj ib leeg yog kev kuaj mob: tsim lub voj kaw kom koj tuaj yeem tshawb xyuas seb qhov chaw nres nkoj lossis lub transceiver puas ua haujlwm hauv zos, tsis muaj kev vam khom rau cov khoom siv hauv chaw taws teeb lossis cov cabling.

Teb ceev:Ib lub fiber ntau loopback cable yog ib qho khoom siv rau kev soj ntsuam uas xa cov teeb liab kho qhov muag ncaj qha rov qab rau hauv qhov chaw txais khoom ntawm tib lub cuab yeej. Nws yog siv los txheeb xyuas cov transceiver thiab chaw nres nkoj ua haujlwm hauv kev sim hauv zos tswj, pab cov engineers cais seb puas muaj qhov txhaum nyob hauv lub cuab yeej lossis lwm qhov hauv qhov txuas.

Fiber loopback khoom muaj nyob rau hauvtib - homthiabmultimodeversions, thiab nyob rau hauv connector hom xws liLC, SC, thiabMTP/MPO. Qhov ntau yam no ua rau lawv siv tau thoob plaws cov ntaub ntawv chaw, chaw lag luam, thiab chaw kuaj mob qhov chaw sib txawv optics thiab cov kab ke sib txuas sib txuas. Loopback connectors feem ntau ua raws li IEC, TIA / EIA, thiab lwm yam kev lag luam tshwj xeeb ntsig txog fiber ntau optic interconnects.
 

Dab tsi yog Fiber Loopback Cable Tiag tiag?

Ib lub fiber ntau loopback cable pab xyuas seb qhov chaw nres nkoj kho qhov muag lossis transceiver tuaj yeem xa thiab tau txais tau zoo hauv qhov kev sim hauv zos. Hauv cov ntsiab lus siv tau, koj siv nws los xyuas seb qhov chaw nres nkoj puas tuaj, seb qhov optic teb li cas, thiab seb Tx thiab Rx tus cwj pwm zoo li kev noj qab haus huv raws li kev kuaj mob yooj yim.

Ntawm no yog qhov kev xeem rov qabua taupaub meej tias:

• Lub transceiver laser yog kis nyob rau hauv nws qhov kev cia siab zog ntau yam.
• Sab tau txais pom cov teeb liab kho qhov muag thiab qhov chaw nres nkoj qhia qhov txuas -txoj cai.
• DOM/DDM nyeem ntawv - suav nrog Tx zog, Rx lub zog, laser bias tam sim no, thiab kub - poob rau hauv qhov chaw pib uas tau teev tseg los ntawm cov chaw tsim khoom transceiver. (Cov kev kuaj mob no yog tus qauv hauv qabSpecification ntawm SFF-8472luam tawm los ntawm SNIA SFF Committee.)

Ntawm no yog qhov kev xeem rov qabua tsis taupov thawj:

• Tias koj tag nrho qhov kawg - mus rau - kawg txoj kev fiber ntau yog teeb meem - dawb.
• Tias cov chaw taws teeb tswj, teeb tsa cabling cog, lossis cov khoom sib txuas hauv cov channel muaj kev noj qab haus huv.
• Tias qhov txuas yuav ua kom raug ntawm tag nrho cov tsheb thauj khoom.

Qhov kev sib txawv no tseem ceeb. Ib qho kev ntsuas rov qab ua tiav tau lees paub qhov chaw nres nkoj hauv zos thiab optic ua haujlwm. Nws tsis validate tag nrho cov channel. Tias yog vim li cas kev ntsuas loopback ua haujlwm zoo tshaj plaws raws li txoj hauv kev sib cais: yog tias lub voj rov qab dhau mus, hloov pauv mus rau cabling, chaw nres nkoj tej thaj chaw deb, lossis kev teeb tsa. Yog tias nws ua tsis tau, qhov teeb meem yuav tshwm sim hauv lub zos optic, chaw nres nkoj, lossis kev teeb tsa.

Fiber Loopback Cable vs Patch Cord vs. Optical Attenuator

Peb cov khoom no tshwm sim hauv cov ntsiab lus ntawm kev ntsuas fiber ntau, tab sis lawv ua haujlwm sib txawv thiab yuav tsum tsis txhob totaub.

A fiber ntau loopback cableyog tsim tshwj xeeb kom rov qab cov teeb liab rau tib lub cuab yeej rau kev sim hauv zos. Afiber ntau thaj qaumyog tsim los txuas cov khoom siv sib cais hauv ib lub network nyob lossis sim. Hauv qee qhov xwm txheej, txoj hlua khi tuaj yeem khoov mus rau hauv lub voj voog ib ntus rau kev sim nrawm, tab sis nws yog qhov tseem ceeb ntawm kev sib txuas cable - tsis yog lub hom phiaj - ua lub voj rov qab module nrog kev tswj tsis tau.

Ibkho qhov muag attenuatordaws qhov teeb meem sib txawv kiag li. Nws txo lub hwj chim kho qhov muag thaum qhov tau txais sab yuav raug teeb liab ntau dhau. Raws li ntau tus neeg muag khoom cov lus qhia, siab - lub zog lossis ntev - ncav cuag optics - xws li cov ntsuas rau 40 km lossis 80 km ib leeg- hom kev txuas - tuaj yeem tso tawm lub zog txaus los ua kom puas lub receiver thaum lub teeb liab rov qab ncaj qha yam tsis muaj kev cuam tshuam. Nyob rau hauv cov ntaub ntawv no, ib tug attenuator yog sivib sablub loopback cable, tsis hloov nws.
 

Ib txoj cai ntawm tus ntiv tes xoo:

• Loopback cable:Siv thaum koj xav tau ceev ceev hauv zos pov thawj ntawm qhov chaw nres nkoj lossis transceiver.
• Patch qaum:Siv thaum koj xav tau txuas cov khoom siv, lossis thaum lub voj voog ib ntus tau txais thiab koj nkag siab txog kev lag luam poob tawm - tawm.
• Attenuator:Siv thaum tau txais lub hwj chim yuav siab dhau rau optic nyob rau hauv kev sim - tshwj xeeb tshaj yog thaum lub sij hawm rov qab ntsuas qhov ntev - mus txog ib qho - hom transceivers.

Yuav Ua Li Cas Ua Kev Ntsuas Fiber Loopback

Qhov kev ntsuam xyuas zoo rov qab yog ntau dua li ntsaws ib yam dab tsi. Nws pib nrog kev paub txog qhov koj xav kom paub meej thiab xaus nrog kev txhais lus.

Kauj Ruam 1: Txhais lub hom phiaj kev xeem

Ua ntej txuas txhua yam, txiav txim siab seb koj tab tom sim ua pov thawj dab tsi. Puas yog koj kuaj xyuas seb lub transceiver tau txais tshiab puas ua haujlwm ua ntej xa tawm? Kev rho tawm seb qhov txuas txuas puas yog hauv zos lossis chaw taws teeb? Kev lees paub qhov chaw nres nkoj xav tias tom qab hloov kho firmware? Lub hom phiaj cov duab uas ntsuas koj saib thiab koj txhais li cas.

Kauj Ruam 2: Muab lub voj rov qab rau koj lub hardware

Xaiv ib lub loopback cable uas phim lub optic los yog chaw nres nkoj nyob rau hauv kev sim nyob rau hauv peb qhov ntev:connector hom, fiber ntau hom, thiab suav fiber ntau.

• Hom Connector:LC rau feem ntau SFP / SFP + duplex optics, SC hauv qee qhov qub txeeg qub teg lossis PON ib puag ncig, thiab MTP / MPO rau qhov sib npaug - fiber ntau transceivers xws li QSFP + (40G) thiab QSFP28 (100G). Ib qho kev sib txuas tsis sib haum yog qhov thaiv tam sim.
• Fiber hom:Siv ib zaug -mode (OS2, 9/125 µm) loopbacks rau ib zaug -mode optics thiab multimode (OM3/OM4, 50/125 µm) rau multimode optics. Cov qauv tsis sib xws yuav ua rau cov txiaj ntsig tsis ntseeg siab lossis tsis muaj qhov txuas -txhua yam.
• Fiber ntau:Duplex loopbacks ua haujlwm rau tus qauv ob -fiber transceivers. Rau 40G SR4 lossis 100G SR4 parallel optics, koj xav tau ib qhoMTP / MPO loopback modulenrog rau qhov tseeb fiber ntau suav (feem ntau yog 8 lossis 12 fibers) thiab polarity configuration.

Kauj ruam 3: Ntxuav lub ntsej muag kawg thiab txuas lub loopback

Ntxig lub transceiver (yog tias tsis tau teeb tsa), tom qab ntawd txuas lub loopback cable ntawm Tx thiab Rx sab. Ua ntej mating, tshuaj xyuas thiab ntxuav lub connector kawg ntsej muag. Cov kauj ruam no tsis yog xaiv tau. Raws li covIEC 61300-3-35 tus qauv, kev kis kab mob ntawm lub ntsej muag fiber ntau yog ib qho ntawm feem ntau ua rau lub teeb liab degradation thiab ua rau cov txiaj ntsig tsis raug. Txawm tias cov khoom txuas tshiab tawm ntawm lub ntim tuaj yeem nqa cov plua plav lossis cov khoom seem ntawm lub kaus mom tiv thaiv.

Tsis tas li ntawd tsis txhob ntse khoov nyob rau hauv lub loopback fiber. Khoov vojvoog ntau dhau qhia qhov khoov poob uas tuaj yeem cuam tshuam koj cov kev nyeem.

Kauj Ruam 4: Tshawb xyuas qib fais fab ua ntej khiav qhov kev xeem

Yog tias koj tab tom sim ntev - ncav cuag lossis siab - lub hwj chim optics - piv txwv li, ib qho 10GBASE-LR transceiver ntsuas rau 10+ km - xyuas seb Tx tso zis hluav taws xob puas dhau lub receiver lub siab tshaj plaws input zog. Thaum lub teeb liab rov qab nrog qhov poob tsawg, tag nrho Tx zog hits Rx ncaj qha. Rau luv -mus txog multimode optics qhov no feem ntau tsis muaj kev txhawj xeeb, tab sis rau siab -hwj chim ib leeg- hom transceivers nws tuaj yeem overload lossis ua rau lub receiver photodiode puas. Nyob rau hauv cov ntaub ntawv no, ntxig ib qho inline optical attenuator ntawm Tx tso zis thiab Rx input kom coj tau lub hwj chim tau txais nyob rau hauv lub transceiver qhov kev nyab xeeb kev khiav hauj lwm ntau yam.

Kauj Ruam 5: Khiav kev kuaj mob thiab soj ntsuam cov ntsuas qhov raug

Thaum lub voj kho qhov muag raug kaw, saib xyuas cov cuab yeej kuaj mob. Nyob ntawm koj lub platform, cov cim tseem ceeb suav nrog:

• Link status:Qhov chaw nres nkoj yuav tsum qhia qhov txuas -up. Yog tias qhov txuas LED nyob twj ywm tsaus lossis qhov chaw nres nkoj qhia "down," ib yam dab tsi tsis ncaj ncees lawm nrog lub optic, chaw nres nkoj, lossis rov qab nws tus kheej.
• Tx zog:Yuav tsum nyob rau hauv lub transceiver tus neeg muag khoom qhov kev teev tseg (feem ntau teev nyob rau hauv daim ntawv teev cov transceiver).
• Rx zog:Yuav tsum ntes tau thiab nyob rau hauv lub receiver rhiab heev thiab overload thresholds. Hauv kev teeb tsa lub voj voog rov qab, Rx lub zog feem ntau yuav nyob ze rau Tx lub zog rho tawm lub voj rov qab qhov kev poob.
• Laser bias tam sim no thiab kub:Cov txiaj ntsig txawv txav ntawm no yuav qhia tau tias qhov kev hloov pauv tsis zoo lossis tsis ua haujlwm, txawm tias qhov txuas tau nce.

Cov kev txwv no tuaj yeem siv tau los ntawm transceiver's Digital Diagnostic Monitoring (DDM) interface, raws li tau hais tseg hauv SFF-8472 specification. Feem ntau tswj cov keyboards thiab routers nthuav tawm DDM nyeem los ntawm lawv CLI lossis tswj software.

Kauj Ruam 6: Txhais cov txiaj ntsig thiab cais qhov txhaum

Yog hais tias qhov kev ntsuam xyuas loopback dhau - txuas tuaj, DOM qhov tseem ceeb nyob hauv spec - lub zos optic thiab chaw nres nkoj yuav zoo heev. Tom qab ntawd koj tuaj yeem hloov kho qhov teeb meem mus rau cov kab txuas txuas, deb -kawg ntaus ntawv, lossis kev teeb tsa.

Yog tias qhov kev sim ua tsis tiav, hloov ib qho kev hloov pauv ntawm ib lub sijhawm: sim ib qho paub zoo - zoo transceiver, sim ib lub voj rov qab sib txawv, txheeb xyuas qhov chaw nres nkoj teeb tsa, lossis txav qhov kev sim mus rau lwm qhov chaw nres nkoj ntawm tib lub hloov. Qhov kev tshem tawm cov txheej txheem no yog qhov kev ntsuas loopback muab nws qhov kev kuaj mob tiag tiag.

Tiag -world piv txwv:Tus engineer network tau txais daim pib teeb meem qhia txog SFP + chaw nres nkoj uas yuav tsis tsim qhov txuas ntawm kev hloov pauv ntau lawm. Ua ntej rub cable lossis xa tus kws tshaj lij mus rau qhov chaw nyob deb, lawv ntxig ib qho -hom LC loopback rau hauv qhov chaw nres nkoj xav tias. Qhov chaw nres nkoj qhia qhov txuas -up, thiab DOM nyeem ntawv qhia Tx zog ntawm −2.1 dBm thiab Rx zog ntawm −2.8 dBm - ob qho tib si hauv spec. Qhov kev ntsuas loopback dhau, uas txwv tsis pub lub hauv paus transceiver thiab chaw nres nkoj. Tus engineer tam sim no paub qhov txhaum nyob rau hauv qhov chaw ntawm lub fiber ntau khiav, lub thaj vaj huam sib luag, los yog nyob deb - khoom siv kawg - txuag cov sij hawm kwv yees.
 

Yuav Ua Li Cas Xaiv Txoj Cai Fiber Loopback Cable

Xaiv txoj cai loopback cable los ntawm kev sib raug zoo nrog koj cov cuab yeej kho vajtse thiab kev paub txog qhov chaw sim. Ntawm no yog ib daim ntawv teev kev xaiv:

Qee cov lus qhia ntxiv txog kev xaiv:

• Rau siab -qhov ceev 40G thiab 100G ib puag ncig siv QSFP + lossis QSFP28 parallel optics, koj xav tauMTP / MPO loopback module- tsis yog duplex LC loopback. Cov suav fiber ntau (feem ntau 8 rau 40G SR4, 12 rau qee qhov kev teeb tsa 100G) thiab polarity yuav tsum raug, lossis cov transceiver yuav tsis txuas.
• Yog tias koj tsis tu ncua sim ob qho tib si - hom thiab khoom siv multimode, khaws ob hom ntawm tes. Ib qho multimode loopback ntawm ib qho -hom chaw nres nkoj (lossis vice versa) feem ntau yuav tsis muaj qhov txuas, lossis tsis ntseeg DOM nyeem uas tuaj yeem ua rau koj qhov kev kuaj mob yuam kev.
• Rau transceivers ua hauj lwm ntawm qhov sib txawv ceev - 1G, 10G, 25G, 100G - lub loopback nws tus kheej tsis tas yuav tsum tau "rated" rau cov ntaub ntawv tshwj xeeb. Qhov tseem ceeb yog tias hom fiber ntau thiab connector phim lub transceiver. Cov ntaub ntawv tus nqi compatibility yog txiav txim los ntawm optic, tsis yog passive loopback cable.

Thaum Loopback Kev Xeem Tsis Txaus

Kev ntsuam xyuas loopback yog thawj kauj ruam uas muaj zog, tab sis nws muaj ib thaj tsam meej. Paub thaum twg yuav txav mus dhau nws tseem ceeb npaum li kev paub yuav ua li cas khiav ib qho.

Xav txog kev nce mus rau lwm txoj hauv kev sim thaum:

• Koj xav tau qhov kawg -rau- xaus qhov kev sib txuas validation.Lub voj rov qab tsuas yog lees paub tus cwj pwm hauv zos xwb. Txhawm rau txheeb xyuas tag nrho txoj hauv kev fiber ntau - suav nrog cov khoom sib txuas, cov kab sib txuas, thiab cov kab txuas txuas txuas ntxiv - koj xav tau lub sijhawm kho qhov muag -domain reflectometer (OTDR) lossis bi-kev ntsuas kev taw qhia tsis zoo.
• Lub loopback hla tab sis qhov txuas ntau lawm tseem ua tsis tiav.Qhov no feem ntau taw qhia txog qhov teeb meem hauv cov kab ke txuas, ib qho khoom siv qias neeg ntawm lub vaj huam sib luag thaj, qhov tsis zoo, lossis qhov deb - qhov kawg ntawm cov khoom siv. Ib qho OTDR tuaj yeem pab txheeb xyuas qhov chaw ntawm qhov txhaum raws li kev khiav haujlwm fiber ntau.
• Koj xav tias marginal kev ua tau zoo dua li qhov tsis ua haujlwm nyuaj.Kev ntsuas rov qab yog qhov mus / tsis yog - mus kuaj. Nws tsis ntsuas channel- theem tsis xws li tag nrhopoob poobhla tag nrho qhov txuas,rov poobntawm txhua qhov txuas, lossis chromatic / modal dispersion.
• Koj tab tom commissioning ib tug tshiab fiber installation.Ua ntej- kev xa mus kuaj kev lees paub feem ntau yuav tsum tau Tier 1 (kev poob qis) lossis Tier 2 (OTDR) kev sim rau TIA-568.3 lossis cov qauv sib npaug - tsis yog ib qho kev kuaj rov qab ntawm txhua qhov kawg.

Xav txog kev ntsuam xyuas loopback yog txoj hauv kev ceev tshaj plaws los teb cov lus nug nqaim: "Puas yog qhov chaw nres nkoj thiab optic pib ua haujlwm?" Yog tias cov lus teb yog yog thiab koj tseem muaj teeb meem, nws yog lub sijhawm los saib tob rau hauv qhov txuas.

Feem ntau yuam kev thiab ceev faj

Piv txwv tias ib qho kev ntsuas loopback validates tag nrho lub network.Tsis yog. Nws yog qhov zoo heev rau kev sib cais hauv zos, tab sis nws tsis qhia koj tsis muaj dab tsi txog kev khiav fiber ntau, cov ntsiab lus nruab nrab nruab nrab, lossis deb - cov khoom siv kawg. Kev kho lub voj voog dhau los ua pov thawj tias "lub network yog qhov zoo" yog qhov kev txhais tsis tseeb tshaj plaws.

Hla txuas txuas tu.Cov ntsej muag qias neeg cuam tshuam rau cov teeb liab zoo thiab tsim DOM nyeem tsis raug. Kev tshawb fawb luam tawm los ntawm NTT Advanced Technology tau pom tias kev sib kis kab mob sib kis rau plaub ntawm tsib qhov ua rau muaj kev cuam tshuam ntawm fiber ntau network. IEC 61300-3-35 tus qauv muab cov ncauj lus kom ntxaws soj ntsuam thiab kev ua kom huv huv - ua raws li lawv ua ntej txhua qhov kev xeem.

Tsis quav ntsej txais lub hwj chim ntawm siab - fais fab optics.Looping ntev -mus txog ib leeg- hom transceiver rov qab rau hauv nws tus kheej yam tsis muaj kev cuam tshuam tuaj yeem thawb tau txais lub zog siab dua tus txais qhov siab tshaj plaws ntawm qhov pib nkag. Qhov no txaus ntshai ua rau lub photodiode puas los yog ua rau lub receiver overload tswb. Nco ntsoov xyuas cov ntaub ntawv transceiver rau qhov siab tshaj plaws Rx input zog thiab muab piv rau qhov xav tau rov qab Rx qib.

Siv hom fiber ntau tsis raug lossis hom connector.Multimode loopback ntawm ib qho -hom chaw nres nkoj - lossis LC loopback ntawm MTP / MPO transceiver - yuav tsis muaj qhov txuas lossis kev nyeem cov khib nyiab. Nco ntsoov xyuas qhov sib tw ua ntej txuas.

Kev liam rau lub cuab yeej thaum lub loopback nws tus kheej yog faulty.Lub vaj huam sib luag puas, tawg sab hauv fiber ntau, lossis khoov ntau dhau ntawm lub voj voog rov qab tuaj yeem tsim qhov kev sim ua tsis tiav uas zoo li cov teeb meem khoom siv. Yog tias qhov chaw nres nkoj ua tsis tau qhov kev ntsuas rov qab, sim ua qhov paub txog -zoo loopback ua ntej rau txim rau lub transceiver lossis chaw nres nkoj.

Qhov twg Fiber Loopback Cables yog qhov tseem ceeb tshaj plaws

Fiber loopback cables pom feem ntau siv hauv cov xwm txheej no:

• Ua ntej- kev sim ua haujlwm rau lub rooj zaum:Xyuas kom tseeb tias cov transceivers tau txais tshiab tau ua haujlwm ua ntej txhim kho lawv hauv cov khoom siv hluav taws xob. Qhov no yog cov qauv kev coj ua hauv cov chaw zov me nyuam cov ntaub ntawv uas tuav cov ntim loj ntawm optics los ntawm ntau tus neeg muag khoom.
• Kev daws teeb meem ntawm Transceiver:Thaum ib qhov txuas mus thiab koj yuav tsum txiav txim siab sai sai seb qhov teeb meem yog qhov chaw kho qhov muag / chaw nres nkoj lossis lwm yam hauv txoj kev.
• Chaw nres nkoj hlawv-hauv thiab tsim nyog:Cov tuam txhab tsim khoom thiab cov chaw kuaj sim siv cov loopback modules thaum lub sij hawm muaj kev ruaj ntseg zoo kom paub meej tias txhua qhov chaw nres nkoj ntawm qhov hloov lossis daim npav router ua haujlwm hauv spec ua ntej xa khoom.
• Kev sib cais ceev ceev hauv ib puag ncig nyob:Thaum tus kws kho mob hauv chaw kho mob xav tau ceev ceev ua ntej- dhau kev kuaj mob ua ntej nce mus rau kev kuaj kab mob los yog xa cov chaw taws teeb - mus ntsib.
• Lab thiab staging ib puag ncig:Qhov twg engineers nquag reconfigure optical links thiab xav tau ib txoj kev txhim khu kev qha los xyuas qhov chaw nres nkoj noj qab haus huv ntawm kev hloov.

Cov lus nug nquag

Puas yog fiber ntau loopback cable zoo ib yam li thaj qaum?

Tsis yog. Ib qho fiber ntau loopback cable yog tsim los xa cov teeb liab rov qab mus rau tib lub cuab yeej rau kev sim. Afiber ntau thaj qaumtxuas ob yam khoom siv sib cais hauv lub network. Thaum ib txoj hlua khi tuaj yeem qee zaum khoov rau hauv lub voj voog ib ntus, nws tsis yog tsim los ua ib lub voj voog rov qab thiab tuaj yeem ua kom paub qhov tsis muaj kev cuam tshuam.

Kuv puas tuaj yeem siv lub voj rov qab cable ntawm ib qho - hom optics?

Yog lawm, tab sis koj yuav tsum siv ib zaug xwb -mode loopback (OS2, 9/125 µm). Siv multimode loopback ntawm ib qho -hom transceiver feem ntau yuav ua rau tsis muaj qhov txuas lossis tsis tuaj yeem nyeem. Kuj xyuas seb qhov - hom optic siab npaum li cas - lub hwj chim - yog li ntawd, koj yuav xav tau lub attenuator los tiv thaiv cov neeg txais khoom ntau dhau thaum kuaj.

Kuv puas xav tau lub attenuator rau kev ntsuas kev ntsuas rov qab?

Nws nyob ntawm tus transceiver. Luv- ncav cuag multimode optics (piv txwv li, 10GBASE-SR) feem ntau tsis tas yuav muaj kev cuam tshuam rau kev ntsuas rov qab. Ntev - mus txog ib qho - hom optics (piv txwv li, 10GBASE-LR, 10GBASE-ER) feem ntau tso tawm lub zog txaus uas lub voj voog - rov qab teeb liab tshaj lub receiver qhov siab tshaj plaws input pib. Nyob rau hauv cov ntaub ntawv no, ib tug inline attenuator yog pom zoo kom coj Rx hwj chim nyob rau hauv lub kev nyab xeeb kev khiav hauj lwm ntau yam teev nyob rau hauv lub transceiver datasheet.

Puas yog qhov kev xeem rov qab ua tau zoo ua pov thawj tias tag nrho cov txuas txuas tau zoo?

Tsis yog. Ib qho kev ntsuas rov qab tsuas yog lees paub tias qhov chaw nres nkoj hauv zos thiab transceiver tuaj yeem xa thiab tau txais tau zoo hauv txoj hauv kev kaw. Nws tsis tau lees paub qhov kev teeb tsa fiber ntau cabling, nruab nrab txuas, splices, lossis qhov deb -kawg ntaus ntawv. Txhawm rau kom ua tiav qhov txuas tag nrho, kev sim ntxiv xws li ntsuas qhov poob lossis OTDR tsom xam yuav tsum tau.

DOM / DDM nyeem ntawv dab tsi kuv yuav tsum tau kuaj thaum lub sijhawm ntsuas kev rov qab?

Yam tsawg kawg nkaus, xyuas Tx zog, Rx zog, laser bias tam sim no, thiab module kub. Sib piv txhua tus nqi tawm tsam lub tswb thiab ceeb toom qhov pib uas tau teev tseg hauv daim ntawv teev cov ntaub ntawv transceiver lossis nthuav tawm los ntawm SFF-8472 kev kuaj mob interface. Yog tias Tx hwj chim nyob hauv spec tab sis Rx lub hwj chim yog qhov txawv txav thaum lub sij hawm rov qab, xav tias ib qho kev sib txuas qias neeg, puas loopback fiber ntau, los yog hom fiber ntau tsis sib haum.