Multimode fiber muaj bandwidth txwv. Cov kab hauv cheeb tsam hauv cheeb tsam tam sim no feem ntau yog muaj 90% multimode fiber. Raws li qhov chaw ua haujlwm fiber ntau kho qhov muag cable hloov kho rau tib hom kab hluav taws xob kho cov kab hluav taws xob, peb kuj yuav tsum muab txoj hauv kev hloov pauv txuas ntxiv mus siv cov cuab yeej xaiv fiber ntau kho qhov muag ua kom deb li deb tau. Txawm li cas los xij, yog tias ib hom siv cov khoom siv los ntawm cov khoom siv kho qhov muag muaj ntau hom, muaj qee cov teeb meem kev ua haujlwm. Qhov teeb meem loj tshaj yog Modular Delay Txawv (DMD). Qhov no txhais tau hais tias thaum lub sijhawm nrawm laser laser mem tes ua haujlwm ntawm cov roj fiber ntau, qhov sib txawv ntawm lub sijhawm tshaj tawm ntawm cov qauv sib txawv hauv lub teeb ua rau muaj qhov tseem ceeb ntawm cov mem tes dav.
Yuav kom daws tau qhov teeb meem no, ib hom hloov dua siab tshiab jumper tau tsim los daws qhov Gigabit Ethernet network daim ntawv thov cov qauv uas siv cov khoom siv laser xa. Nyob rau hauv daim ntawv thov daim teb dhau lub hom phiaj tsim ntawm cov khoom siv fiber ntau optic, hom hloov siab jumper yog txoj kev los paub qhov tsav tsheb sib nrug ntawm cov khoom siv. Qhov no ua rau cov neeg siv khoom nce qib kho cov thev naus laus zis tsis muaj kev cuam tshuam cov nqi ntawm kho kom zoo dua cov khoom siv fiber ntau. Ntxiv mus, qhov hloov hloov chaw jumper txhim kho qhov zoo ntawm cov ntaub ntawv teeb liab thaum nce qhov kev sib kis.
Dab tsi yog qhov hloov kho jumper?
Hom hloov dua siab tshiab thaj qaum, tseem hu ua hom hloov dua siab tshiab plug-in kab (MCP), yog ob chav ntau hom thaj ua ke nrog ib ntu me me ntawm ib hom fiber ntau thaum pib kis ntev. Cov kab hluav taws xob tsis zoo no yog tsim los kho cov teeb meem laser tawm thiab tau txais cov kab ua haujlwm kom tau txais txiaj ntsig, kom qhov bandwidth zoo tau ze rau qhov bandwidth uas ntsuas los ntawm kev tshaj tawm emission. MCP tso cai rau lub tshuab xa hluav taws xob laser ua haujlwm ntawm tus lej gigabit thaum siv multimode fiber. Yuav tsis txwv los ntawm qhov sib txawv hauv cov txheej txheem qeeb modulus. Lub ntsiab lus tseem ceeb yog ua kom zoo dua muaj ntau tus qauv nyob hauv fiber ntau, thiab hnyav lub cev hom. Lub cev dhau emission mob heev ua rau muaj siab txaus siab rau hom hom, uas tuaj yeem zam qhov kev ntsuas loj ntawm ib leeg ntawm hom tshuab nrog tib lub zog. Lub laser tuaj yeem tsim ua hom fiber ntau thiab tom qab ntawd txuas nrog ntau hom fiber ntau. Cov phiaj txheej nkag tawm yog tawm-nruab nrab nrog kev hwm rau cov tub ntxhais txoj hlua fiber ntau. Hom no ua tiav lub hom phiaj saum toj no.
Cov lus qhia: Txawv sib txawv yuav tsum muaj 50µm thiab 62.5µm multimode fibers. Cov kws tsim ua haujlwm pom tau tias ib qho kev sib tw ntawm 17 ~ 23µm tuaj yeem ua tiav qhov bandwidth sib npaug rau hom kev ua tau zoo ntawm 62.5µm multimode fiber dhau txaws ua cov qauv. Qhov tawm ntawm 10 ~ 16µm yog qhov zoo dua rau 50µm multimode fiber.
Lub hauv paus ntsiab lus ntawm txoj kev ua no yog tias lub kho qhov muag cable yuav tso tawm laser lub teeb rau hauv qhov me me ntawm hom fiber ntau. Lwm qhov kawg ntawm cov hom fiber ntau kho qhov muag tau txuas nrog rau ntau hom ntu ntawm cov kho qhov muag cable thiab tau pab txhawb los ntawm qhov chaw ntawm ntau hom optical fiber ntau. Cov thauj khoom siv uas siv ob qho tib hom thiab ntau hom fiber ntau (xws li 1000BASE-LX / LH, 10GBASE-LX4, thiab 10GBASE-LRM) yuav tsum siv cov kab no. Thaum tso lub laser mus rau ntau hom fiber ntau, lub transceiver tuaj yeem tsim cov teeb liab nyuaj, uas yuav ua rau muaj kev cuam tshuam kev hloov qeeb, uas yuav cuam tshuam loj qhov kev sib kis. MCP tshem cov paib no ntau lub cim thiab daws cov teeb meem sab ntawm tus tau txais. Nov yog duab uas qhia txog MCP thiab cov qauv kev sib txuas ntawm cov khoom sib hloov transceiver. Yog tias tsim nyog, nws tuaj yeem tso nruab nrab ntawm transceiver module thiab ntau hom kho qhov muag cable cov khoom siv.
Qhov xav tau rau kev siv MCP hauv kev siv cov tshuab laser
Gigabit Ethernet
Cov tseev kom muaj rau MCP tsuas yog teev rau 1000BASE-LX / LH transceivers uas siv 1300nm qhov kis tau tus mob thiab tau thov rau ntawm fiber ntau Nws yog txwv tsis pub siv MCP hauv 850nm qhov rai ntawm 1000BASE-SX txuas. Rau 1000BASE-LX / LH daim ntawv thov ntawm FDDI-qib, OM1 thiab OM2 fiber ntau, MCP yog qhov yuav tsum tau ua. Nws yog txwv tsis pub siv MCP ntawm OM3 hu ua" optimized laser fiber ntau" ;. Ceeb toom:
1. Muaj qee kis, cov neeg siv khoom lag luam yuav muaj qhov kev paub zoo tias qhov kev sib txuas ua haujlwm tau zoo ntawm OM1 lossis OM2 fiber ntau saum qib FDDI-qib thiab tsis muaj MCP Txawm li cas los xij, nws yuav tsum raug sau tseg tias qhov no tsis tau lees tias qhov txuas yuav tuaj yeem tswj tau lub xeev zoo hauv ntau qhov kev sib tw, yog li MCP tseem pom zoo.
2. Yog tias MCP tsis siv rau hauv cov ntawv thov uas tsis raug, tej zaum yuav muaj kev phom sij, tshwj xeeb tshaj yog thaum lub jumper cable yog FDDI-chav kawm lossis OM1 hom. Hauv qhov ua piv txwv no, lub hwj chim txuas ncaj qha rau ntawm 62.5µm fiber, uas tej zaum yuav siab li ob peb dBm, thiab cov tau txais ze tshaj plaws yuav saturate. Qhov no yuav ua rau tus lej siab qhov yuam kev ntau dua, txuas oscillations, txuas lub xeev kev tiv thaiv, thiab thaum kawg tsis ua kev puas tsuaj rau lub ntaus ntawv.
3. Thaum tus neeg siv khoom tseem tsis txaus siab siv MCP fiber optic cable, thiab tus neeg siv khoom siv OM3 fiber ntau kho qhov muag cable, thov ntsuas lub hwj chim theem ua ntej ntxig rau cov kab xa hluav taws xob fiber ntau rau hauv cov khoom txais. Thaum ntsuas lub zog tau ntau dua -3dBm, ib 1300nm, 5dB attenuator yuav tsum siv thiab ntsaws rau hauv qhov chaw ntawm lub tshuab hluav taws xob optical transmitter ntawm ob sab ntawm qhov txuas.
4. Rau kev yooj yim, lwm txoj hauv kev yog siv tib hom dhia hauv tib qhov chaw. Tsis muaj qhov teeb meem tsis tseeb ntawm ib hom fiber ntau.
10-Gigabit Ethernet
MCP qhov uas yuav tsum tau tsuas yog muaj kev sib kis ntawm 10GBASE-LX4 thiab 10GBASE-LRM transceivers hauv 1300nm qhov rais thiab lawv cov ntawv thov ntawm multimode optical fibers. Nws yog txwv tsis pub siv MCP hauv 850nm qhov rai ntawm 10GBASE-SR txuas. Rau daim ntawv thov ntawm GBASE-LX4 thiab 10GBASE-LRM ntawm FDDI-qib, OM1 thiab OM2 fiber ntau, MCP yog qhov yuav tsum tau ua. Nws yog txwv tsis pub siv MCP ntawm OM3 hu ua" optimized laser fiber ntau" ;.
Cov lus ceeb toom ntawm 10GBASE-LX4:
1. Qee zaum, cov neeg yuav khoom tau muaj qhov kev paub zoo tias qhov kev txuas ua haujlwm tau zoo ntawm OM2 fiber ntau yam tsis muaj MCP. Tab sis yog tias MCP tsis siv rau FDDI-qib lossis OM1 fiber ntau, qhov tshwm sim ntawm kev sib txuas ua haujlwm zoo yog tsawg heev.
2. Thaum cov neeg siv khoom tseem tsis txaus siab siv MCP fiber ntau kho qhov muag ntawm OM2, thiab rau cov neeg siv uas siv OM3 fiber ntau kho qhov muag, nws yog qhov tsim nyog los siv 5dB attenuator ntawm 1300nm thiab muab nws tso rau ntawm qhov chaw xa cov khoom sib txuas ntawm cov khoos phis tawm kho qhov muag. ntawm ob tog ntawm qhov txuas kom tsis txhob muaj saturation, Tej zaum nws yuav ua rau kev sib txuas ntawm oscillation thiab ua rau lub cuab yeej puas.
3. Rau kev yooj yim, lwm txoj hauv kev yog siv tib hom dhia hauv tib qho chaw. Tsis muaj qhov teeb meem tsis tseeb ntawm ib hom fiber ntau. Nws yuav tsum raug sau tseg tias thaum 10GBASE-LX4 cov cuab yeej siv IEEE-ua raws ib hom fiber ntau, qhov kev sib kis yuav ncav cuag ntau dua 10km.
Cov lus ceeb toom ntawm 10GBASE-LRM:
1. Rau cov neeg siv khoom OM3 fiber ntau, MCP yuav tsum tsis txhob siv. Nws raug nquahu kom ntsuas kev ua kom lub zog ua ntej yuav ntxig cov fiber ntau rau hauv cov ntawv sib txuas. Thaum lub zog tau txais kev ntsuas ntsuas ntau tshaj 0.5dBm, 5dB attenuator ntawm 1300nm yuav tsum tau siv thiab ntsia ntawm qhov chaw xa cov khoom ntawm cov qauv kho qhov muag ntawm ob sab ntawm qhov txuas.
2. Rau kev yooj yim, lwm txoj hauv kev yog siv tib hom dhia hauv tib qhov chaw. Tsis muaj qhov teeb meem tsis tseeb ntawm ib hom fiber ntau. Nws yuav tsum raug sau tseg tias qhov sib kis deb ntawm 10GBASE-LRM cov khoom siv tuaj yeem ncav cuag 300 meters thaum siv ib hom fiber ntau.
Cov ntsiab lus kom nco ntsoov thaum nruab MCP
Thaum siv 1000BASE-LX / LH, 10GBASE-LX4, thiab 10GBASE-LRM transceivers nrog cov tsoos 62.5 lossis 50µm multimode fiber, MCP yuav tsum tau nruab ntawm transceiver thiab multimode fiber ntau cable ntawm ob qho kawg ntawm qhov txuas. Rau txhua qhov txuas ntawm FDDI-qib, OM1 thiab OM2 fiber ntau hom, MCP yuav tsum tau, tab sis nws raug txwv tsis pub siv MCP ntawm OM3 thiab cov ntawv thov siv fiber ntau kawg.
Ceeb toom: Nws tsis pom zoo kom siv 1000BASE-LX / LH, 10GBASE-LX4 thiab 10GBASE-LRM transceivers nrog multimode fiber thiab non-patch cables kom ua tiav cov kab txuas luv heev (kaum tawm meters). Qhov tshwm sim ntawm kev ua qhov no yog ua kom nce tus nqi yuam kev me me (BER) thiab ua kom puas cov khoom txais.
MCP raug nruab rau nruab nrab ntawm cov khoom txais hluav taws xob thiab cov khoom xa xov hluav taws xob. Rau txhua lub tshuab nruab, ob qho MCP yuav tsum. Thaum txhim kho lub jumper, ua raws li cov theem hauv qab no:
Kauj Ruam 1: Ntxig rau ib leeg-hom kho qhov muag kab hluav taws xob txuas mus rau hauv lub qhov xa cov kab sib kis;
Kauj Ruam 2: Ntxig rau lwm tus ib nrab ntawm txuas txuas ntxiv mus rau hauv qhov tau txais lub qhov ntawm transceiver;
Kauj Ruam 3: Lwm qhov kawg ntawm tus jumper, ntxig ob lub ntau hom txuas rau hauv kab hlau txuas;
Kauj Ruam 4: Rov ua txoj haujlwm los ntawm Kauj Ruam 1 txog Kauj Ruam 3 kom pom cov transceiver thib ob ntawm lwm qhov kawg ntawm kev sib txuas network.
