Lub fiber ntau loopback cable loops lub xaim (Tx) teeb liab ntawm qhov chaw nres nkoj kho qhov muag ncaj nraim rov qab rau hauv nws qhov txais (Rx) sab, yog li koj tuaj yeem paub meej tias lub transceiver lossis chaw nres nkoj tuaj yeem xa thiab tau txais lub teeb yam tsis muaj chaw taws teeb kawg. Nws yog siv rau transceiver thiab chaw nres nkoj diagnostics, ua ntej- kev xa mus kuaj, kuaj xyuas qhov tseeb, thiab kev tsim hluav taws kub -in. Nws uatsis yoglees paub qhov txuas fiber ntau txuas, thaj vaj huam sib luag, lossis chaw taws teeb optics. Txhawm rau xaiv ib qho kom raug, phim hom txuas (LC, SC, lossis MPO / MTP), hom fiber ntau (ib zaug- hom lossis multimode), polish (UPC lossis APC), wavelength, thiab - rau MPO - fiber ntau suav, polarity, pinout, thiab poj niam txiv neej.
Dab tsi yog Fiber Loopback Cable?
Ib tug fiber ntau loopback cable - kuj muag raws li ib tug fiber optic loopback, loopback module, los yog loopback adapter - yog ib tug luv luv optical sib dhos uas xa rov qab lub teeb liab los ntawm kev xa ib sab ntawm ib tug kho qhov muag interface rov qab mus rau nws txais sab. Nyob rau hauv ib qho kev sib txuas ib txwm, ib lub cuab yeej xa lub teeb rau hauv fiber ntau thiab ib qho khoom siv thib ob tau txais nws. Nyob rau hauv ib qho kev ntsuas rov qab, lub teeb yeej tsis ncav cuag qhov kawg ntawm qhov chaw; lub loopback pub nws ncaj nraim rov qab rau hauv tib qhov chaw nres nkoj lossis module. Qhov ntawd tso cai rau koj kom paub meej tias qhov chaw kho qhov muag hauv zos ua haujlwm ua ntej koj siv sijhawm tshawb nrhiav lwm txoj hauv kev.
Engineers ncav cuag rau lub voj rov qab thaum lawv xav tau kev sim:
- Optical transceivers (SFP, SFP +, SFP28, QSFP +, QSFP28, QSFP-DD, OSFP)
- Hloov, router, thiab kab - daim npav qhov chaw nres nkoj
- Network interface cards thiab server NIC optics
- Cov ntaub ntawv chaw thiab cov khoom siv hauv xov tooj hauv kev teeb tsa lossis kho
- Modules nyob rau hauv lub rooj ntev zaum (lab) los yog qhov chaw kuaj ntau lawm
Nws yog ib txoj kev ceev tshaj plaws los cais ibhauv zostxhaum (transceiver, chaw nres nkoj, los yog configuration) los ntawm ib qho teeb meem nyob rau lwm qhov ntawm qhov txuas.
Yuav Ua Li Cas Fiber Loopback Cable Ua Haujlwm?
Lub tshuab yog ncaj qha: lub rooj sib txoos txuas Tx rau Rx. Thaum koj ntsaws lub voj rov qab rau hauv qhov chaw nres nkoj sib xws, lub teeb kis tau rov qab mus rau hauv txoj kev tau txais, thiab lub cuab yeej kuaj xyuas seb nws puas tau rov qab los ntawm qhov nws xa.
Kev xeem dhau txhais tau hais tias qhov chaw nres nkoj lossis transceiver tuaj yeem xa thiab tau txaisnyob rau hauv qhov kev xeem ntawd. Ib qho kev xeem tsis ua tiav cov ntsiab lus rau lub transceiver, chaw nres nkoj kho vajtse, kev teeb tsa, theem teeb liab, lossis cov xwm txheej txuas.
Qhov tseem ceeb txwv: ib lub voj voog dhau mus uatsis yogua pov thawj qhov txuas sab nraud yog noj qab nyob zoo. Nws validates lub zos interface thiab txoj kev looped nkaus xwb. Yog hais tias lub loopback dhau mus tab sis qhov txuas nyob tseem ua tsis tiav, saib ntawm thaj chaw qaum, thaj vaj huam sib luag, polarity, pob nyiaj siv kho qhov muag, kev huv, chaw taws teeb optics, lossis kev teeb tsa.
Cov lus qhia teb: Thaum 10G SFP + chaw nres nkoj nyob qis tom qab rov- thaj ua rau thaj, ntxig LC loopback ntawm lub transceiver. Yog tias qhov chaw nres nkoj tuaj txog thiab qhov hloov CLI qhia tau hais tias ib txwm txuas lub xeev thiab lub zog kho qhov muag, lub transceiver thiab chaw nres nkoj hauv zos yuav luag zoo - txav koj cov xim mus rau lub cabling, polarity, thiab tej thaj chaw deb kawg es tsis yog swapping lub module ua ntej.
Fiber Loopback Cable Hom: LC vs SC vs MPO / MTP
Loopbacks raug xaiv los ntawm hom connector, fiber ntau, polish, wavelength, thiab daim ntawv thov. Peb tsev neeg connector npog yuav luag txhua rooj plaub.
| Loopback hom | Hom interfaces | Fiber suav | Kev siv | Cov ntsiab lus tseem ceeb xaiv |
|---|---|---|---|---|
| LC | SFP, SFP +, SFP28, duplex LC ports | 2 (duplex) | Nkag mus / sib sau cov keyboards, cia, 1G txog 25G optics | Fiber hom thiab polish |
| SC | SC duplex ports, media converters, ib co telecom/FTTH | 2 (duplex) | Legacy thiab industrial iav, lab lub rooj zaum | Hom thiab polish; loj ferrule |
| MPO/MTP | QSFP+, QSFP28, QSFP-DD, OSFP parallel optics | 8, 12, 16, 24 | High-cov ntaub ntawv ceev ceev; 40G / 100G / 400G kuaj | Fiber suav, polarity, pinout, poj niam txiv neej |
LC Fiber Loopback Cable
LC loopbacks ua haujlwm me me - daim ntawv - lub ntiaj teb qhov tseem ceeb: SFP, SFP +, SFP28, thiab lwm yam duplex LC chaw nres nkoj ntawm Ethernet keyboards, khaws ntaub, thiab nkag mus rau optics. Lub LC cov hneev taw me me yog vim li cas nws tseem nyob siab - qhov ceev 1G txog 25G cov khoom siv. Yog tias koj sib piv lub loopback rau ib qho chaw nres nkoj, lubLC connectoryog lub duplex interface koj yuav ntsib feem ntau. Paub meej tias ib qho - hom piv rau multimode thiab UPC piv rau APC ua ntej xaj.
SC Fiber Loopback Cable
SC loopbacks haum cov cuab yeej nrog lub SC interface loj dua - media converters, qee qhov kev lag luam thiab kev siv xov tooj cua, thiab cov khoom siv hauv chav kuaj. Vim tias SC lub ntsej muag kawg feem ntau yog lub kaum ntse ntse - polished hauv ib zaug - hom xov tooj, xyuas cov polish kom zoo; mating ib qho chaw nres nkoj APC nrog UPC loopback degrades rov qab poob thiab tuaj yeem tsim cov txiaj ntsig tsis raug. Peb qhia rauSC / APC connectorspiav qhia tias vim li cas lub ntsej muag kawg ntawm lub ntsej muag tseem ceeb rau kev xav txog - cov kab txuas nkag siab.
MPO / MTP Fiber Loopback Cable
MPO thiab MTP loopbacks tuav ntau-fiber, sib npaug -optic interfaces thiab yog tus qauv rau siab-cov ntaub ntawv qhov chaw ntsuas qhov ceev - QSFP+ 40G, QSFP28 100G, thiab QSFP-DD/OSFP ntawm 200G/400G. Tsis zoo li lub duplex LC, MPO loopback yuav tsum phim cov fiber ntau suav, polarity, pinout, poj niam txiv neej, thiab kev taw qhia tseem ceeb. Parallel applications xws li 40GBASE-SR4 thiab 100GBASE-SR4, txhais hauvIEEE 802.3 Ethernet tus qauv, xa mus rau plaub txoj kab (yim fibers) ntawm 12-fiber MPO, yog li lub loopback yuav tsum tau raws nraim txoj kab uas siv module. Xaiv qhov tsis ncaj ncees lawm pinout ua tsis tau qhov kev xeem txawm tias thaum lub transceiver noj qab nyob zoo. Yog tias koj tsis paub meej tias ob tus qauv txuas txuas txuas li cas, saib yuav ua li casMTP thiab MPO connectors txawv.
Cov lus qhia teb: Ua ntej xaj MPO loopback rau 100GBASE-SR4 QSFP28 module, paub meej tias cov suav fiber ntau (8 ntawm 12 fibers siv), poj niam txiv neej (qhov chaw nres nkoj module feem ntau yog khub nrog txiv neej / pinned loopback), polarity, thiab cov ntsiab lus tseem ceeb. Lub voj rov qab nrog poj niam txiv neej tsis ncaj ncees lawm yuav tsis ua phooj ywg, thiab qhov tsis ncaj ncees lawm fiber routing nyeem raws li kev ua tsis tiav ntawm qhov zoo kawg nkaus module.
Tib -Mode vs Multimode Fiber Loopback
Kev sib piv hom fiber ntau yog ib qho ntawm qhov siab tshaj plaws - cov kev xaiv xaiv thaum yuav lub voj voog rov qab, thiab nws taug qab cov optics koj tab tom sim - ib yam li koj yuav phimtib- hom thiab multimode SFP modulesmus rau txoj cai fiber ntau.
| Yam ntxwv | Tib -mode loopback | Multimode loopback |
|---|---|---|
| Fiber ntau | OS 2 | OM3 / OM4 / OM5 |
| Yam wavelength | 1310 nm, 1550 nm | 850nm ua |
| Hom optics | LR, ER, ZR; telecom, metro, ntev - ncav cuag | SR, SR4; data center luv- ncav cuag |
| Connector ceev | Feem ntau APC ntawm telecom SC; LC los yog MPO | Feem ntau UPC; LC los yog MPO |
| Siv nws rau | Tib - hom transceivers nkaus xwb | Multimode transceivers nkaus xwb |
Txoj cai yog luv: ib zaug -mode loopback rau ib zaug -mode optics, multimode loopback rau multimode optics. Tsis txhob muab sib tov tshwj tsis yog ib txoj kev qhia tshwj xeeb hais rau - ib hom kev tsis sib haum ua rau tsis raug lossis ua tsis tiav.
Fiber Loopback Cable vs Loopback Module
"Loopback cable" thiab "loopback module" piav qhia txog tib txoj haujlwm hauv cov pob sib txawv, thiab qhov yog nyob ntawm qhov koj sim.
- Loopback cable:luv fiber sib dhos looping Tx rau Rx. Saj zawg zog thiab yooj yim los xyuas thiab ntxuav; zoo rau lub rooj ntev zaum ua haujlwm thiab txhua qhov chaw koj xav pom txoj kev fiber ntau.
- Loopback module / adapter:compact, self{0}}muaj ntsaws nrog lub voj fiber ntau kaw rau hauv. qis dua -profile thiab nrawm dua los ntxig rau hauv cov vaj huam sib luag ntom ntom; haum rau kev rov ua haujlwm thiab siv cov ntaub ntawv chaw.
Rau cov neeg coob coob racks, lub compact module feem ntau yog nrawm dua; rau kev sim thiab kev tsim cov teeb tsa uas koj rov- txiav lossis tshuaj xyuas ntau zaus, daim ntawv cable yooj yim. Cov kev ua haujlwm zoo ib yam, yog li xaiv los ntawm daim ntawv zoo thiab durability.
Thaum twg Koj Yuav Tsum Siv Fiber Loopback Cable?
Siv lub voj rov qab thaum twg koj xav tau sim qhov kev sib txuas kho qhov muag hauv kev sib cais.
Ua ntej -Kev Ntsuas Kev Ua Haujlwm
Ua ntej txhim kho cov keyboards tshiab, routers, kab ntawv, lossis modules, voj txhua qhov chaw nres nkoj kom paub meej tias nws xa thiab tau txais. Kev ntes qhov chaw nres nkoj tuag ntawm lub rooj ntev zaum yog qhov pheej yig dua li nrhiav tau tom qab lub cuab yeej racked thiab cabled.
Transceiver thiab Port Diagnostics
Thaum ib qhov txuas yuav tsis tuaj, lub loopback qhia koj sab twg los caum. Yog hais tias qhov chaw nres nkoj hla, qhov txhaum yuav yog sab nraud (fiber, patching, polarity, tej thaj chaw deb kawg, los yog configuration). Yog tias qhov chaw nres nkoj tsis ua haujlwm, qhov txhaum yog hauv zos (transceiver, chaw nres nkoj, lossis nws qhov kev teeb tsa).
Kev tsim khoom thiab hlawv -Nyob rau hauv Kev Xeem
Cov neeg tsim qauv thiab cov chaw sim ntsuas lub voj voog optics thaum lub sijhawm ua haujlwm thiab hlawv- hauv kev sim vim tias lub voj voog rov ua rau Tx- rov qab mus rau -Rx txoj hauv kev yam tsis tau tsim qhov kawg- mus rau-kawg network rau txhua chav. Ib lub voj voog tswj tau cia ib qho kev khiav tsheb khiav tawm tsam nws tus kheej hla qhov kub thiab txias thaum lub sijhawm yuam kev thiab lub zog kho qhov muag tau nkag.
Kev tu thiab kev daws teeb meem
Thaum lub sijhawm tu, rov qab rov qab sai sai - lees paub qhov chaw nres nkoj xav tias - tshwj xeeb tshaj yog thaum tsis muaj qhov kawg thib ob lossis thaum koj xav tau cov lus teb sai.
Yuav Ua Li Cas Khiav Fiber Loopback Test Ib kauj ruam los ntawm kauj ruam
Cov kauj ruam tseeb yog nyob ntawm lub cuab yeej thiab cov software kuaj mob, tab sis kev ntsuas fiber ntau loopback khiav zoo li qhov no.
Kauj ruam 1 - Qhia qhov chaw nres nkoj lossis transceiver
Paub meej tias qhov interface twg yog qhov xav tau thiab sau nws cov connector hom, ceev, fiber ntau hom, thiab wavelength.
Kauj Ruam 2 - Xaiv qhov sib txuam loopback
Match connector hom (LC / SC / MPO / MTP), fiber ntau hom, polish (UPC / APC), wavelength, MPO polarity thiab pinout, thiab seb puas xav tau attenuation.
Kauj Ruam 3 - Tshawb xyuas thiab ntxuav
Cov ntsej muag qias neeg kawg yog qhov ua rau poob siab, xav txog, thiab kev nyeem tsis ruaj khov. Tshawb xyuas thiab ntxuav ua ntej txhua qhov ntxig, thiab khaws cov plua plav plua plav ntawm cov loopbacks tsis siv.
Kauj ruam 4 - Ntxig kom zoo
Zaum lub connector tsis yuam nws. Rau MPO/MTP, txheeb xyuas qhov tseem ceeb taw qhia thiab poj niam txiv neej ua ntej tso.
Kauj ruam 5 - Khiav qhov kev kuaj mob
Siv lub cuab yeej CLI lossis lub network khiav haujlwm, daim ntawv thov xeem, lossis lub tshuab hluav taws xob tsheb. Nyob ntawm lub platform, saib txuas lub xeev, tau txais lub zog kho qhov muag, qhov yuam kev thiab CRC cov txee, rov qab mus los, lossis cov qauv ntawm tus kheej - cov txiaj ntsig kev xeem.
Kauj ruam 6 - Txhais qhov tshwm sim
Yog tias nws dhau mus, txoj hauv zos Tx thiab Rx ua haujlwm nyob rau hauv kev sim. Yog tias nws ua tsis tiav, kos, nyob rau hauv kev txiav txim: transceiver zaum, chaw nres nkoj configuration thiab admin xeev, kawg -lub ntsej muag huv si, connector/mode/polish match, teeb liab theem (overload los yog nyob rau hauv-power), ces lub loopback tus kheej specification.
Kauj ruam 7 - Tshem tawm thiab khaws cia
Rub lub voj rov qab, hloov lub kaus mom plua plav, thiab khaws cia rau hauv cov ntaub ntawv huv si kom tiv thaiv lub ntsej muag kawg.
Common Fiber Loopback Test Failures thiab yuav kho lawv li cas
Feem ntau qhov "ua tsis tau" cov kev ntsuas rov qab yog teeb meem teeb meem, tsis yog cov modules tuag. Ua hauj lwm tej yam yuav ua rau kom.
| Cov tsos mob | Zoo li ua rau | Yuav kuaj lossis ua dab tsi |
|---|---|---|
| Chaw nres nkoj yuav tsis txuas, tsis pom lub teeb | Tsis yog fiber ntau hom lossis polish; module ua tsis taus | Match SM / MM thiab UPC / APC; txheeb xyuas qhov chaw nres nkoj yog admin-enabled |
| Kev xeem MPO ua tsis tiav ntawm qhov paub txog - zoo module | Tsis yog polarity, pinout, los yog poj niam txiv neej | Paub meej tias fiber ntau suav, hom polarity, kev taw qhia tseem ceeb, thiab txiv neej / poj niam |
| Kev poob siab, kev xav, lossis kev nyeem tsis ruaj khov | qias neeg los yog puas kawg lub ntsej muag | Tshawb xyuas thiab ntxuav rau IEC 61300-3-35; rov tshuaj xyuas; hloov yog puas |
| Txuas tab sis CRC lossis me ntsis yuam kev | Receiver overload ntawm lub voj luv luv, lossis marginal optics | Ntxiv txoj cai attenuation; re- ntxuav thiab rov kuaj dua ua ntej rau txim rau lub module |
| Passes loopback, nyob txuas tseem down | Fault yog sab nraud rau lub zos interface | Xyuas thaj qaum, vaj huam sib luag, polarity, optical pob nyiaj siv, thiab tej thaj chaw deb optics |
Cov lus qhia teb: Yog tias lub voj rov qab dhau mus tab sis CRC qhov tsis raug txuas ntxiv ntawm qhov txuas nyob, tsis txhob hloov lub transceiver ua ntej. Tshawb xyuas txoj kev sab nraud fiber ntau thiab tej thaj chaw deb optics - lub loopback twb tau tshem tawm hauv zos interface.
Cov ntsiab lus tseem ceeb los xyuas ua ntej yuav khoom
Lub loopback zoo li tsis tseem ceeb, tab sis qhov tsis ncaj ncees lawm specification ua rau nws tsis muaj txiaj ntsig rau koj qhov kev sim. Txheeb xyuas txhua yam hauv qab no.
| Specification | Yuav ua li cas kom paub meej |
|---|---|
| Hom Connector | LC lossis SC rau duplex; MPO / MTP rau parallel optics |
| Fiber hom | OS2 single-mode vs OM3/OM4/OM5 multimode - match the optics |
| Polish | UPC vs APC (lub kaum sab xis, lub cev ntsuab) - yuav tsum phim qhov chaw nres nkoj |
| Lub wavelength | 850 nm (multimode) los yog 1310/1550 nm (ib zaug-mode) kev khiav hauj lwm qhov rais |
| Insertion thiab rov poob | Haum rau kev kuaj mob; paub meej tias ntawm daim ntawv teev cov ntaub ntawv |
| MPO polarity thiab pinout | Fiber suav, hom polarity, thiab kev taw qhia tseem ceeb |
| Connector poj niam txiv neej (MPO) | Txiv neej/pinned vs poj niam/tsis muaj-pin los ua phooj ywg chaw nres nkoj |
| Attenuation | Tsuas yog cov txheej txheem lossis kev siv nyiaj txiag xav tau nws |
| Vaj tse / form factor | Compact module rau tuab panels; kab rau lub rooj zaum |
Insertion poob thiab rov poob.Cov teeb no yuav ua li cas ntxuav txoj kev looped. Raws li kev siv ua haujlwm, ib qho zoo tib yam -mode loopback feem ntau qhia tias qhov poob qis hauv qab 0.5 dB, nrog kev rov qab poob feem ntau 50 dB lossis zoo dua rau UPC thiab 60 dB lossis zoo dua rau APC - tab sis ib txwm lees paub tiv thaiv cov ntaub ntawv sib dhos thiab koj cov khoom siv. Yog tias cov tswv yim tsis paub, saib yuav ua li casinsertion poob thiab rov poobtxawv.
Polish (UPC vs APC).Angled (APC) thiab tiaj (UPC) lub ntsej muag kawg tsis hloov pauv tau; mating lawv mismatches kev sib txuas ob qho tib si mechanically thiab optically. Ua raws li cov cuab yeej siv.
Attenuation thiab receiver zog.Ntawm cov voj voog luv luv, xa hluav taws xob tuaj yeem tsaws nyob ze lossis siab dua tus neeg txais lub siab tshaj plaws cov tswv yim, thiab qee cov ntawv teev cov ntaub ntawv sau tseg tias kev txo qis yuav tsum tau lav rau kev ua haujlwm - ib qho taw tes Cisco ua rau nws40GBASE QSFP modules. Siv lub ntsuas hluav taws xob ruaj khov rau qhov ntsuas qhov ntsuas qhov ntsuas thaum cov ntaub ntawv lossis koj cov peev nyiaj siv hluav taws xob hu rau nws; txwv tsis pub tus qauv loopback zoo.
Xaus -lub ntsej muag zoo.Cov txiaj ntsig ntseeg tau nyob ntawm qhov huv, hauv -spec ferrules. Ib tug zoo loopback yuav tsum tau soj ntsuam rauIEC 61300-3-35: Cov, tus qauv thoob ntiaj teb rau fiber ntau -optic connector kawg- lub ntsej muag huv si, nrog ntsuas ntsuas thiab rov qab poob thiab, rau MPO, txheeb xyuas polarity thiab pinout.
Yuav Ua Li Cas Xaiv Fiber Loopback Cable
Muab qhov kev txiav txim raws li kev txiav txim:
- Txuas- LC lossis SC rau duplex ports; MPO/MTP rau QSFP-chav kawm parallel optics.
- Hom- single-mode rau ib leeg-mode optics, multimode rau multimode optics.
- Polish- phim UPC lossis APC rau qhov chaw nres nkoj.
- Lub wavelength- paub meej tias lub voj rov qab npog lub qhov rais ua haujlwm.
- MPO cov ntsiab lus- suav fiber ntau, polarity, pinout, poj niam txiv neej, thiab kev taw qhia tseem ceeb.
- Attenuation- tsuas yog cov txheej txheem lossis nyiaj siv hluav taws xob xav tau.
- Form factor- compact module rau tuab racks; kab rau lub rooj zaum.
Ua ntej koj xaj, sib sau ua ke: cov khoom siv, hom ntawv transceiver, chaw nres nkoj txuas, hom fiber ntau, wavelength, polish, cable-vim-module nyiam, MPO fiber ntau suav / poj niam txiv neej / polarity / pinout, ntxig thiab xa rov qab yuav tsum tau poob, kev xav tau kev xav tau, thiab kev sim ib puag ncig (lab, Hoobkas, cov ntaub ntawv chaw, lossis thaj chaw). Muab cov npe no tso cai rau tus neeg muag khoom paub meej txog qhov yog thawj zaug - koj tuaj yeem ua tauxa cov kev cai no rau kev pom zooes tsis muaj kev pheej hmoo rau kev txiav txim tsis sib haum. Rau siab - qhov ceev 40G / 100G / 400G ua haujlwm, kuj lees paub qhov sib xwsMPO / MTP kabyog li lub loopback thiab nyob txuas qhia tib lub tswvyim polarity.
FAQ
Q: Lub hom phiaj ntawm fiber ntau loopback cable yog dab tsi?
A: Nws loops qhov chaw nres nkoj kho qhov muag xa cov teeb liab rov qab mus rau nws sab tau txais yog li koj tuaj yeem txheeb xyuas qhov chaw nres nkoj lossis transceiver xa thiab tau txais kom raug - yam tsis tas yuav siv lub chaw taws teeb.
Q: Cov fiber ntau loopback kuaj tau lees paub tag nrho cov fiber ntau txuas?
A: Tsis yog. Nws validates lub zos interface thiab txoj kev looped nkaus xwb. Kev lees paub cov kab txuas txuas yuav tsum tau kuaj pom qhov poob (OLTS), thiab nrhiav qhov tsis raug raws li kev khiav yuav tsum muaj OTDR.
Q: Qhov txawv ntawm LC thiab MPO loopback yog dab tsi?
A: LC loopbacks pab duplex ports xws li SFP / SFP + / SFP28. MPO loopbacks pab ntau-fiber parallel optics xws li QSFP+/QSFP28 thiab siab dua, thiab xav tau cov fiber ntau suav, polarity, pinout, thiab poj niam txiv neej.
Q: Kuv puas yuav tsum xaiv ib qho -hom lossis multimode loopback?
A: Sib piv cov optics: ib zaug -mode loopback rau ib zaug -mode transceivers, multimode loopback rau multimode transceivers.
Q: Kuv puas tuaj yeem siv multimode loopback ntawm ib qho -mode transceiver?
A: Tsis yog, tshwj tsis yog cov txheej txheem tshwj xeeb tso cai rau nws. Cov tub ntxhais qhov loj me thiab wavelengths sib txawv, yog li qhov tsis sib haum xeeb ua rau muaj kev nkag siab yuam kev lossis ua tsis tiav.
Q: Kuv puas xav tau UPC lossis APC loopback?
A: Sib phim qhov chaw nres nkoj polish. APC (angled, ntsuab) yog ib qho ntawm kev xav txog -sensitive single-mode telecom; UPC muaj ntau yam hauv kev sib txuas lus cov ntaub ntawv. Mating UPC rau APC mismatches kev sib txuas.
Q: Dab tsi yog qhov txawv ntawm fiber ntau loopback cable thiab ib lub loopback module?
A: Same Tx-to-Rx function, txawv pob. Lub cable yog ib lub voj voog hloov tau yooj yim; ib qho module yog lub kaw lus kaw ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom.
Q: Puas yog fiber ntau loopback cables yuav tsum tau ua - nyob rau hauv attenuation, thiab ntau npaum li cas?
A: Tsuas yog thaum cov txheej txheem lossis kev siv nyiaj kho qhov muag xav tau nws - feem ntau kom xa lub zog qis dua tus neeg txais kev nkag siab tshaj plaws ntawm lub voj voog luv. Loj qhov attenuation rau lub module's datasheet input range ntau dua li twv.
Q: Vim li cas kuv qhov kev xeem MPO loopback ua tsis tau txawm tias lub transceiver zoo?
A: Feem ntau polarity, pinout, poj niam los txiv neej, lossis kev taw qhia tseem ceeb - lossis lub ntsej muag qias neeg. Paub meej tias MPO routing phim lub module thiab rov- tshuaj xyuas lub ferrule ua ntej xav tias qhov optics.
Ntsiab Cai
Lub fiber ntau loopback cable yog ib qho ceev, tsawg -nqi txoj hauv kev los cais lub zos kho qhov muag interface rau transceiver diagnostics, ua ntej - xa mus kuaj, lab validation, thiab hlawv -in. Nws lees paub tias qhov chaw nres nkoj puas tuaj yeem xa thiab tau txais, tab sis nws tsis lees paub qhov txuas sab nraud, yog li ua ke nrog OLTS lossis OTDR thaum koj xav tau cov txiaj ntsig txuas tag nrho. Yuav kom zoo ib yam, phim hom connector, fiber ntau hom, polish, thiab wavelength; rau MPO/MTP, kuj kaw cov fiber ntau suav, polarity, pinout, thiab poj niam txiv neej. Hais kom huv si, IEC- tau tshuaj xyuas lub ntsej muag kawg thiab txheeb xyuas qhov ntxig thiab rov qab poob, thiab ntxiv kev txo qis tsuas yog thaum tus neeg txais cov lus tawm tswv yim hu rau nws. Tau txais cov ntsiab lus kom raug thiab lub voj rov qab yuav txiav lub sijhawm daws teeb meem thiab khaws cov chaw nres nkoj tsis raug ntawm koj lub network nyob.
