Lub voj voog rov qab yog lub cuab yeej kuaj lub cev uas xa cov khoom siv hluav taws xob tawm ncaj qha rov qab rau hauv nws tus kheej qhov chaw nres nkoj, tso cai rau cov kws tshaj lij los xyuas seb qhov chaw sib cuam tshuam hauv zos puas tuaj yeem xa thiab tau txais yam tsis muaj kev cia siab rau cov khoom siv nyob deb lossis kev sib txuas hauv network. Hauv fiber ntau optic, Ethernet, thiab serial ib puag ncig, kev ntsuas rov qab yog ib txoj hauv kev ceev tshaj plaws los cais cov chaw nres nkoj xav tias tsis raug lossis transceiver ua txhaum ntawm lwm txoj hauv kev network.
Txawm hais tias koj tab tom daws teeb meem ntawm qhov chaw hloov pauv uas tsis kam tuaj, lees paub lub transceiver tshiab ua ntej muab tso rau hauv kev tsim khoom, lossis khiav kev lees paub hauv cov ntaub ntawv tsim tawm, lub cuab yeej rov qab pab koj teb ib nqe lus nug ua ntej: puas yog kho vajtse hauv zos ua haujlwm?
Loopback Cable yog dab tsi thiab nws ua haujlwm li cas?
Lub loopback cable tsim ib txoj hauv kev kaw ntawm ib qho chaw nres nkoj. Hloov chaw xa cov ntaub ntawv tawm mus rau lwm lub cuab yeej ntawm lub network, cov khoom xa tawm (Tx) yog lub cev txuas rov qab mus rau qhov tau txais (Rx) cov tswv yim ntawm tib lub interface. Cov cuab yeej tseem ceeb tham nrog nws tus kheej.
Qhov no tseem ceeb vim tias nws tshem tawm txhua qhov hloov pauv sab nraud - chaw taws teeb kho vajtse, kev sib txuas ntawm cov khoom siv, kev sib tham nrog kev deb -kawg hloov - thiab cia koj sim ib yam ntawm ib lub sijhawm: qhov chaw nres nkoj hauv zos thiab nws cov kab hluav taws xob cuam tshuam. Yog tias qhov kev ntsuas rov qab dhau mus, qhov chaw nres nkoj qhov xa tawm yooj yim - thiab - tau txais txoj hauv kev ua haujlwm. Yog tias nws ua tsis tiav, koj paub tshawb xyuas cov khoom siv hauv zos - qhov chaw nres nkoj, lub transceiver, lossis lub connector - ua ntej siv sij hawm tracing cables los yog liam qhov deb kawg.
Cisco cov ntaub ntawv ntawm kev daws teeb meem kab sib txuas piav qhia txog txoj hauv kev no raws li tus qauv kev coj ua: khiav ib qho kev ntsuas rov qab ntawm lub zos kawg ua ntej, tom qab ntawd mus sim cov ntu txuas ntxiv ntawm lub voj voog tsuas yog tias cov khoom siv hauv zos kuaj tawm (Cisco: Loopback Tests rau T1 / 56K Kab).
Loopback Cable vs. Loopback Plug vs. Loopback Adapter vs. Loopback Module
Cov ntsiab lus no ua rau muaj kev tsis sib haum xeeb tiag tiag ntawm kev yuav khoom, ib feem vim tias cov neeg muag khoom siv lawv tsis sib haum. Nov yog qhov lawv txawv hauv kev xyaum:
| Lub sij hawm | Hom Form Factor | Common Interfaces | Zoo tshaj rau |
|---|---|---|---|
| Loopback kab | luv cable nrog ob connectors koom nyob rau hauv ib lub voj | Fiber ntau (LC, SC, FC, ST), serial | General -kev sim qhov chaw nres nkoj thiab transceiver |
| Loopback plug | Compact, ib qho -plug | RJ45 (Ethernet), DB-9 / DB-25 (serial) | Ceev Ethernet lossis serial chaw kuaj xyuas |
| Loopback adapter | Ntau yam - tej zaum yuav zoo li lub ntsaws los yog luv luv cable sib dhos | Ntau | Lub sij hawm dav; xyuas kom meej connector compatibility ua ntej yuav |
| Loopback module | Compact, enclosed module uas ntsaws ncaj qha mus rau hauv lub transceiver bay los yog chaw nres nkoj | MPO / MTP, LC, SC (fiber); SFP/QSFP form factor | High -cov khoom siv fiber ntau ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom iav fiber ntau racks |
Lub hauv paus ntsiab lus ntawm kev xeem yog tib yam rau tag nrho plaub: voj Tx rov qab rau Rx thiab xyuas seb qhov chaw nres nkoj teb. Qhov sib txawv yog nyob rau hauv daim ntawv ntawm lub cev, hom connector, thiab zoo npaum li cas cov cuab yeej haum rau koj cov khoom siv tshwj xeeb. Thaum txiav txim, tsom tsawg dua ntawm cov khoom lag luam daim ntawv lo thiab ntau ntxiv rau qhov tseeb interface compatibility - connector style, fiber ntau, thiab polish hom.
Hom Loopback Cables los ntawm Interface
Fiber Optic Loopback Cable
Lub fiber ntau loopback cable yog siv los kuaj qhov chaw nres nkoj optical, transceivers, thiab hauv zos fiber ntau txoj hauv kev. Nws feem ntau muaj qhov ntev ntawm fiber ntau nrog ob qho tib si xaus rau tib yamfiber ntau optic connectorvaj tse, routing optical tso zis ncaj qha rov qab mus rau lub tswv yim.
Hom connector hom muaj xws liLC, SC, FC, ST, thiabMPO/MTP. Cov khoom muaj nyob rau hauv ob qho tib sisinglemodethiabmultimodeversions - thiab qhov kev sib txawv no tseem ceeb heev. Singlemode fiber ntau muaj 9 µm core ua haujlwm ntawm 1310 nm lossis 1550 nm wavelengths, thaum multimode fiber siv 50 µm lossis 62.5 µm core ntawm 850 nm lossis 1300 nm. Txuas ib singlemode loopback rau hauv multimode chaw nres nkoj - los yog vice versa - yuav ua tau unreliable tshwm sim los yog ib tug ua tiav xeem tsis ua hauj lwm vim hais tias ntawm lub core loj thiab wavelength mismatch.
Fiber loopback testing yog kev coj ua hauv kev sib tham hauv xov tooj, chaw zov me nyuam, thiab chaw kuaj mob. Nws yog ib qho tseem ceeb tshwj xeeb tshaj yog thaum koj xav tau kom paub meej tias qhov kev hloov kho qhov muag ntawm Tx / Rx txoj kev ua haujlwm ua ntej txuas mus rau qhov txuas ntawm fiber ntau.
RJ45 Ethernet Loopback Plug
Ib qho RJ45 loopback plug yog ib qho khoom siv sib txuas uas txuas cov pins tshwj xeeb ntawm qhov chaw nres nkoj Ethernet - feem ntau txuas pins 1 thiab 3 (Tx+ rau Rx+) thiab pins 2 thiab 6 (Tx– rau Rx–) rau 10/100BASE-T. Rau Gigabit Ethernet, tag nrho plaub khub tau koom nrog, thiab kev xaim yog qhov nyuaj dua.
Hauv kev xyaum, qhov no yog cov cuab yeej koj ncav cuag thaum lub qhov hloov pauv chaw nres nkoj LED yog tsaus lossis amber thiab koj xav txiav txim siab seb qhov chaw nres nkoj nws tus kheej puas tuag ua ntej kuaj lub cable khiav. Nws yog me me kom khaws cia rau hauv ib lub cuab yeej thiab siv sijhawm ob peb feeb los siv. Txawm li cas los xij, RJ45 loopback tsuas yog lees paub qhov chaw nres nkoj hauv zos lub peev xwm los tsim kom muaj lub cev sib txuas teeb liab - nws tsis kuaj cov kab cog ntawm cov khoom siv. Qhov kev sib txawv ntawd tseem ceeb, tshwj xeeb tshaj yog tias koj tab tom sib piv cov txiaj ntsig rov qab mus rau tag nrhoEthernet cablekev soj ntsuam txuas ntxiv.
Serial Loopback Cable (RS-232 / RS-485)
Lub serial loopback plug txuas tus xa cov ntaub ntawv tus pin mus rau qhov tau txais cov ntaub ntawv tus pin ntawm RS -232 lossis RS-485 interface - feem ntau tus pin 2 (TxD) rau tus pin 3 (RxD) ntawm DB-9 connector tom qab TIA-574 pinout. Kev tswj cov teeb liab ntxiv (DTR, DSR, CTS, RTS, DCD) feem ntau yog hla kev sib txuas kom ua tau raws li kev tuav tes (Sealevel: Serial Loopback Adapter Pinouts).
Serial loopback testing tseem cuam tshuam rau hauv kev lag luam automation, telecom infrastructure, thiab legacy device puag ncig qhov twg RS-232 thiab RS-485 kev sib txuas lus tseem siv tau.
Fiber Loopback Modules rau siab -Density thiab Parallel Optics
Nyob rau hauv siab -qhov chaw kho qhov muag ceev - 40G QSFP+, 100G QSFP28, los yog 400G QSFP-DD setups - ib tug loopback module feem ntau nyiam dua ib tug xoob loopback cable. Cov modules no tau ntim kom haum rau daim ntawv transceiver thiab ntsaws ncaj qha rau hauv qhov chaw nres nkoj, muab kev ntxuav huv thiab kev tiv thaiv zoo dua hauv cov khoom ntim nruj.
MPO/MTP-raws li loopback modulesyog tsim los rau parallel optics kuaj, qhov twg ntau fiber ntau channel kis ib txhij los ntawm ib tug connector. Thaum xaiv ib qho, paub meej tias cov suav fiber ntau (8-fiber, 12-fiber, lossis 24-fiber), hom polarity, thiab seb lub module puas phim koj tus transceiver poj niam txiv neej thiab kev taw qhia tseem ceeb. Kev ua raws li cov qauv xws li TIA / EIA 604-5 (FOCIS-5) rau MPO connectors yog qhov qhia tau zoo ntawm kev tsim khoom zoo.
Thaum twg Koj Yuav Tsum Siv Loopback Cable?
Chaw nres nkoj Fault Isolation
Thaum xav tias qhov chaw nres nkoj hloov pauv tab sis qhov deb - cov cuab yeej kawg thiab cov cabling tsis paub lossis nkag tsis tau, qhov kev ntsuas rov qab ntawm qhov chaw nres nkoj hauv zos yog thawj kauj ruam ntawm kev xav. Yog tias lub voj rov qab dhau mus, koj tuaj yeem hloov koj qhov kev tshawb fawb mus rau cable, thaj vaj huam sib luag, lossis qhov kawg ntawm cov chaw taws teeb. Yog tias nws ua tsis tiav, koj tau lees paub qhov ua txhaum hauv zos yam tsis tau nkim sij hawm ntawm qhov txuas ntxiv.
Transceiver thiab Optics Txais Kev Xeem
Hauv kev kuaj pom fiber ntau - tshwj xeeb tshaj yog thaum cov ntaub ntawv chaw tsim tawm lossis thaum tau txais ib pawg tshiab ntawm SFP/QSFP transceivers - ib qho kev ntsuas rov qab lees paub tias txhua tus transceiver's optical Tx / Rx txoj kev ua haujlwm ua ntej nws mus rau hauv ntau lawm. Qhov no yog sai dua thiab ntau lub hom phiaj ntau dua li tos kom txog thaum lub transceiver raug xa mus rau ntawm qhov txuas nyob kom pom qhov ua tsis tiav. Ib qho fiber ntau loopback matchedtransceiverconnector thiab fiber hom yog qhov tseem ceeb rau qhov kev ua haujlwm no.
Kho thiab Lab Environments
Hauv kev teeb tsa hauv chav kuaj, cov khoom siv loopback tso cai rau cov engineers los ntsuas qhov chaw nres nkoj ua haujlwm yam tsis tas yuav tsum muaj cov cuab yeej sib koom ua ke ntawm lwm qhov kawg. Nyob rau hauv lub qhov rais txij nkawm, ib tug ceev loopback check yuav xyuas tau hais tias ib tug chaw nres nkoj tseem noj qab nyob zoo tom qab ib tug kho vajtse hloov los yog firmware upgrade, ua ntej reconnect nws mus rau lub ntau lawm network.
Serial Port Validation nyob rau hauv Industrial thiab Telecom Chaw
Rau RS-232 lossis RS-485 interfaces ntawm cov tswj kev lag luam, lub davhlau ya nyob twg servers, lossis cov khoom siv hauv xov tooj, lub serial loopback plug pab kom paub meej tias qhov chaw nres nkoj UART thiab cov neeg tsav tsheb circuitry ua haujlwm. Qhov no yog cov txheej txheem kuaj mob ua ntej tshawb xyuas raws tu qauv lossis software teeb meem.
Qhov Kev Ntsuas Loopback Yuav Ua Li Cas - thiab Tsis Tau - Qhia Koj
Kev nkag siab txog cov ciam teb ntawm ib qho kev ntsuas loopback tiv thaiv kev txhais lus tsis raug.
Ib qho kev ntsuas loopback lees paub:
- Qhov chaw nres nkoj hauv zos tuaj yeem xa thiab tau txais ntawm lub cev txheej.
- Lub transceiver txoj kev kho qhov muag lossis hluav taws xob ua haujlwm tau zoo.
- Lub zos connector thiab interface circuitry tsis zoo lawm.
Ib qho kev ntsuas loopback tsis paub meej:
- Xaus-rau- xaus txuas kev noj qab haus huv ntawm ob lub cuab yeej.
- Tej thaj chaw deb ntaus ntawv functionality los yog configuration.
- Cable cog kev ncaj ncees tshaj qhov chaw nres nkoj hauv zos.
- Siab dua - txheej txheem txheej txheem ua haujlwm (routing, hloov logic, daim ntawv thov tsheb).
- Optical fais fab nyiaj txiag los yogpoob poobhla txoj kev fiber ntau.
Ib qho yuam kev hauv thaj teb: ib qhov chaw nres nkoj dhau qhov kev ntsuas rov qab, thiab tus kws tshaj lij xav tias tag nrho cov txuas tau zoo. Tab sis cov chaw taws teeb transceiver tej zaum yuav raug teeb tsa tsis raug, cov fiber ntau khiav yuav muaj qhov khoov ntau dhau, lossis tuaj yeem muaj qhov tsis sib xws ntawm duplex ntawm qhov kawg. Loopback pass txhais tau hais tias cov khoom siv hauv zos tsis yog qhov teeb meem - nws tsis meej dab tsi dhau qhov ntawd.
Yuav Ua Li Cas Xaiv Txoj Cai Loopback Cable
Xaiv ib lub loopback ntaus ntawv pib nrog lub interface koj yuav tsum tau sim, tsis nrog ib tug khoom catalog. Siv qhov kev txiav txim siab no:
Kauj ruam 1: Qhia qhov chaw nres nkoj thiab txuas
| Hom Chaw nres nkoj | Pom zoo Loopback khoom |
|---|---|
| Ethernet (RJ45) | RJ45 rov qab plug |
| LC Duplex optical chaw nres nkoj | LC fiber ntau loopbackcable los yog module |
| SC duplex optical chaw nres nkoj | SC fiber ntau loopback cable |
| MPO/MTP parallel optics | MPO / MTP loopback module |
| Qauv: RS-232 DB-9 | DB-9 serial loopback plug |
| Qauv: RS-232DB-25 | DB-25 serial loopback plug |
Kauj Ruam 2: Sib phim Fiber Hom thiab Wavelength (Fiber nkaus xwb)
Rau cov khoom siv fiber ntau loopback, koj yuav tsum phim:
- Fiber hom:Singlemode (OS2, 9/125 µm) lossis multimode (OM3/OM4/OM5, 50/125 µm). Kev siv hom tsis ncaj ncees lawm yuav ua rau muaj teeb meem ntau dhau los lossis kev sim ua tsis tiav. Yog xav paub ntxiv txog cov kev faib tawm no, saib peb phau ntawv qhiasinglemode vs multimode SFP transceivers.
- Hom Connector:LC, SC, FC, ST, los yog MPO/MTP - yuav tsum phim qhov chaw nres nkoj.
- Polish hom:UPC (flat) los yog APC (angled) - siv APC loopback ntawm UPC chaw nres nkoj (los yog vice versa) ua rau poob siab thiab tsis ntseeg tau. APC connectors yog txheeb xyuas los ntawm lawv cov ntsuab ferrule.
Kauj Ruam 3: Xav txog Form Factor
Hauv chav kuaj lossis cov cuab yeej hauv teb, ib qho xoob fiber ntau loopback cable ua haujlwm zoo. In a production data center with high-density patch panels, a compact loopback module is easier to insert, less likely to snag adjacent cables, and protects exposed fiber ends. RauMPO breakout cableib puag ncig tshwj xeeb, ib qho keyed module kom tsis txhob muaj qhov tsis meej pem polarity uas tuaj yeem tshwm sim nrog xoob cables.
Kauj Ruam 4: Txheeb xyuas Lub Hom Phiaj Xeem
Yog tias koj xav tau ceev yog / tsis teb rau seb qhov chaw nres nkoj puas muaj sia nyob, qhov yooj yim loopback ntsaws yog txaus. Yog tias koj tab tom ua haujlwm ntau lawm-qib transceiver validation thiab xav tau qhov tsis tshua muaj qhov tsis zoo thiab paub cov yam ntxwv kho qhov muag, nqis peev hauv qhov zoo- kuaj cov khoom rov qab uas xa nrog ntsuas qhov kev poob qis. Zoo fiber ntau loopback connectors feem ntau raug kuaj rau ANSI/TIA/EIA-455-171 attenuation qauv.
Yuav Siv Li Cas Loopback Cable: Kauj Ruam -los ntawm - Kauj Ruam
1. Txhais qhov koj tab tom sim
Ua ntej koj ntsaws ib yam dab tsi, hais cov lus nug kom meej. "Puas yog qhov hloov chaw nres nkoj SFP + transceiver xa thiab txais?" yog ib nqe lus nug. "Puas yog lub network ua haujlwm?" tsis yog - ib qho kev ntsuas rov qab tsis tuaj yeem teb qhov ntawd.
2. Xaiv qhov Kho Loopback Device
Ua kom haum lub connector, fiber ntau hom, thiab polish hom raws nraim. Yog tias koj tab tom sim LC singlemode chaw nres nkoj, siv LC singlemode loopback - tsis yog LC multimode, thiab tsis yog SC singlemode.
3. Tshawb xyuas thiab ntxig
Rau kev sib txuas ntawm fiber ntau, tshuaj xyuas lub loopback lub ntsej muag kawg ua ntej tso. Cov kab mob sib kis yog ib qho ntawm feem ntau ua rau kev sim tsis raug nyob rau hauv ib puag ncig fiber ntau. Siv qhov ntsuas fiber ntau yog tias muaj, lossis tsawg kawg yog lint - so dawb. Ntxig lub loopback rau hauv lub hom phiaj chaw nres nkoj khov kho tab sis tsis muaj zog ntau dhau.
4. Khiav Diagnostic
Cov lus txib tshwj xeeb nyob ntawm koj lub platform. Ntawm Cisco IOS li, koj tuaj yeem teeb tsarov qab sab nraudnyob rau hauv lub interface thiab ces khiav ib tug ncua ping mus rau lub interface tus IP chaw nyob. Hauv lwm lub platform, tus neeg muag khoom tau tsim ua -hauv kev kuaj mob siv hluav taws xob lossis daim ntawv thov kev sim siab ua haujlwm zoo ib yam. Txheeb xyuas qhov txuas LED xwm txheej ua ntej - ntawm cov cuab yeej siv feem ntau, qhov kev sib txuas zoo txuas rov qab yuav coj qhov chaw nres nkoj txuas lub teeb rau xim ntsuab.
5. Txhais cov ntsiab lus kom zoo
Kev hla txhais tau hais tias qhov chaw nres nkoj hauv zos txoj kev Tx / Rx yog qhov ua haujlwm ntawm lub cev txheej. Qhov tsis ua tiav qhia txog qhov teeb meem kho vajtse hauv zos - qhov chaw nres nkoj, lub transceiver, lossis lub connector. Tab sis tsis txhob dhau - txhais ib qho dhau los: nws tsis ua pov thawj qhov kev siv hluav taws xob kho qhov muag txaus rau kev sib txuas tag nrho, thiab nws tsis lees paub qhov kev teeb tsa, qhov deb -kawg ntaus ntawv, lossis cable cog nyob nruab nrab.
6. Tshem tawm, rov qab, thiab cov ntaub ntawv
Tom qab kev sim, tshem tawm lub loopback ntaus ntawv, reconnect lub ntau lawm cable, thiab sau ntawv dab tsi qhov kev xeem tau pov thawj thiab dab tsi nws tsis tau. Hauv kev saib xyuas kev ua haujlwm, cov ntaub ntawv no tiv thaiv tus kws tshaj lij tom ntej los ntawm rov- sim tib qhov chaw nres nkoj yam tsis tsim nyog.
Feem ntau yuam kev hauv Loopback Test
Yuav los ntawm cov khoom npe es tsis txhob txuas cov lus qhia tshwj xeeb.Ib yam khoom uas sau tias "fiber loopback adapter" yuav muaj LC connectors thaum koj xav tau SC, lossis nws yuav yog singlemode thaum koj qhov chaw nres nkoj xav tau ntau hom. Nco ntsoov xyuas qhov tseeb connector hom, fiber ntau hom, thiab polish ua ntej xaj.
Kho lub voj rov qab hla dhau los ua ib daim ntawv hla tag nrho.Qhov no yog qhov kev txhais tsis tseeb tshaj plaws. Ib lub zos loopback lees paub qhov chaw nres nkoj. Nws tsis hais dab tsi txog cable khiav, deb -kawg ntaus ntawv, los yog lubinsertion poob hla lub fiber txuas. Ib txwm ua raws li qhov kawg - mus rau - qhov kawg kev xeem thaum ua kom tiav ib lub voj voog.
Tsis quav ntsej hom fiber ntau thiab polish compatibility.Siv multimode loopback ntawm ib qho chaw nres nkoj singlemode ua rau cov txiaj ntsig tsis muaj nuj nqis. Kev sib xyaw UPC thiab APC polish hom qhia txog kev rov qab siab - kev xav uas tuaj yeem ua rau qee qhov chaw laser puas lossis cov ntaub ntawv xeem tsis raug. Cov ntsiab lus no tseem ceeb tshaj li cov khoom lag luam.
Hla kev soj ntsuam cov connector.Tshwj xeeb tshaj yog nyob rau hauv kev ntsuam xyuas fiber ntau, ib qho hmoov av ntawm ib lub ntsej muag txuas kawg tuaj yeem ua rau cov teeb meem tsis zoo txaus los ua qhov tsis tseeb. Ntxuav thiab tshuaj xyuas ua ntej txhua qhov kev xeem.
Piv txwv tias txhua qhov chaw nres nkoj tsis ua haujlwm yog kho vajtse.Yog tias qhov chaw nres nkoj ua tsis tau qhov kev ntsuas rov qab, kho vajtse yog qhov xav tsis thoob. Tab sis cov kab laum software, qhov chaw nres nkoj tsis muaj teeb meem, lossis qhov teeb meem ntawm transceiver compatibility kuj tuaj yeem ua rau qhov tsis ua tiav. Paub meej cov txiaj ntsig nrog tus thib ob paub- zoo loopback ntaus ntawv ua ntej hloov kho vajtse.
Koj Yuav Tsum Ua Koj Tus Kheej Loopback Cable?
Rau RS yooj yim -232 serial xeem, ua ib lub voj rov qab ntsaws los ntawm qhov seem DB-9 txuas yog ncaj nraim - Sealevel thiab Oracle ob qho tib si luam tawm cov ntawv txheeb xyuas pinout rau DB-9 thiab DB-25 loopback thaiv (Oracle: Loopback Connector Wiring). Ob peb feeb nrog ib tug soldering hlau muab rau koj ib tug functional cuab tam rau lab los yog kawm siv.
Rau cov khoom siv fiber ntau loopback, DIY yog qhov nyuaj dua los ua pov thawj. Fiber connectors yuav tsum tau polishing meej, thiab lub ntsej muag tsis zoo kawg qhiakev poob qis thiab rov qab -relectionuas tuaj yeem ua tsis raug qhov kev xeem. Hauv kev tsim khoom lossis kev lees paub qhov kev ntsuas qhov kev rov ua dua tseem ceeb, lub Hoobkas - kuaj rov qab nrog cov ntaub ntawv poob tshwj xeeb yog qhov kev xaiv zoo dua. Tus nqi sib txawv me me rau qhov kev pheej hmoo ntawm kev siv lub sij hawm poob los ntawm qhov tsis ntseeg DIY loopback.
FAQ
Q: Puas yog lub voj rov qab cable zoo ib yam li cov kab hluav taws xob?
A: Tsis yog. Ib lub patch cable txuas ib lub cuab yeej mus rau lwm qhov, ua qhov txuas ntawm ob qhov chaw nres nkoj. Lub loopback cable xa cov teeb liab los ntawm ib qho chaw nres nkoj cov zis rov qab rau nws tus kheej cov tswv yim rau tus kheej - kuaj. Lawv ua hauj lwm sib txawv kiag li.
Q: Lub voj rov qab cable puas tuaj yeem kuaj fiber ntau optic transceiver?
A: Nws tuaj yeem txheeb xyuas qhov transceiver hauv zos Tx/Rx optical path - seb lub laser xa mus thiab tus receiver pom cov teeb liab xa rov qab. Qhov no ua rau nws pib tshawb xyuas sai thaum lub sijhawm lees txais transceiver. Txawm li cas los xij, nws tsis kuaj tus transceiver tus cwj pwm hla qhov sib txuas ntawm fiber ntau nrog qhov tseeb, qhov sib txuas, thiab qhov poob ntawm qhov muag.
Q: Kuv puas xav tau qhov sib txawv loopback rau txhua hom chaw nres nkoj?
A: Yog. Ib qho RJ45 loopback plug tsuas yog ua haujlwm ntawm Ethernet ports. Lub loopback fiber ntau yuav tsum phim qhov chaw nres nkoj txuas (LC, SC, MPO / MTP) thiab hom fiber ntau (singlemode lossis multimode). Lub serial loopback plug yog tshwj xeeb rau lub serial connector pinout. Tsis muaj universal loopback ntaus ntawv.
Q: Puas yog loopback cable tib yam li lub network loopback chaw nyob?
A: Tsis yog. Ib lub voj voog rov qab yog ib qho khoom siv lub cev siv rau kev sib tshuam - theem kev kuaj mob. Qhov chaw nyob rov qab (xws li 127.0.0.1 hauv IPv4) yog lub tswv yim software siv los ntawm kev khiav hauj lwm lub network pawg xa tsheb mus rau nws tus kheej yam tsis muaj kev cuam tshuam lub cev. Lawv qhia lo lus "loopback" tab sis ua haujlwm ntawm cov txheej txheem sib txawv kiag li.
Q: Qhov txawv ntawm LC loopback module thiab LC loopback cable yog dab tsi?
A: Ob leeg ua tib qhov kev sim - looping LC Tx rov qab rau Rx. Qhov txawv yog ntim. Lub loopback cable yog luv fiber ntau nrog ob LC connectors. Ib lub voj voog rov qab kaw lub voj fiber ntau hauv lub vaj tsev compact, feem ntau zoo ib yam li SFP module daim foos, uas yooj yim dua los tuav hauv siab -racks ceev thiab tsis tshua muaj kev puas tsuaj rau cov khoom sib txuas.
Q: Kuv puas tuaj yeem siv lub loopback cable los kuaj fiber ntau txuas ntxiv?
A: Tsis yog. Ib lub voj rov qab cable ntsuas qhov chaw nres nkoj hauv zos thiab transceiver - lub teeb liab yeej tsis tawm ntawm qhov cuam tshuam. Txhawm rau kuaj fiber ntau txuas txuas ntxiv, koj xav tau cov cuab yeej xws li qhov pom qhov tsis pom kev pom (VFL), lub sijhawm kho qhov muag -domain reflectometer (OTDR), lossis lub teeb pom kev zoo thiab lub zog ntsuas hluav taws xob.
Xaus
Lub loopback cable yog ib qho kev tsom, ua haujlwm zoo rau ib txoj haujlwm tshwj xeeb: lees paub tias qhov chaw nres nkoj hauv zos lossis transceiver tuaj yeem xa thiab tau txais ntawm lub cev txheej. Nws tsis hloov qhov kawg -rau- kawg txuas kev sim, kev teeb tsa kev siv tau, lossis kev soj ntsuam raws tu qauv - tab sis nws muab koj qhov pib txhim khu kev qha rau kev cais tsis raug.
Tus yuam sij kom tau txais txiaj ntsig tau zoo yog sib piv cov khoom lag luam rov qab rau koj qhov kev sib txuas lus tseeb: txoj cai txuas, txoj cai fiber ntau, thiab hom polish zoo. Rau Ethernet ports, ib qho RJ45 loopback plug yog txhua yam koj xav tau. Raufiber ntau opticib puag ncig, phim lub voj rov qab rau lub transceiver lub connector thiab wavelength. Rau siab - qhov sib npaug ntawm qhov sib npaug, siv qhov yuam sij kom raugMPO / MTP loopback moduleuas haum rau qhov chaw nres nkoj yam tsis muaj qhov tsis meej.
Pib nrog qhov chaw nres nkoj. Sib piv cov khoom. Kuaj ib qho sib txawv ntawm ib lub sijhawm. Qhov ntawd yog li cas kev ntsuas loopback ua haujlwm zoo tshaj plaws.
