Ib lub hub yog ib qho me me, duab plaub, pheej yig ntaus ntawv uas koom nrog ntau lub network-enabled devices. Lawv feem ntau ua los ntawm cov yas thiab tau txais lub zog los ntawm lub qhov hluav taws xob ntawm phab ntsa.
Lub hom phiaj ntawm lub hub yog tsim ib ntu kev sib txuas uas txhua yam khoom siv tuaj yeem sib txuas lus ncaj qha rau ib leeg.
Txog thaum xyoo 2000s, Ethernet hubs tau siv dav rau kev sib tham hauv tsev vim lawv qhov yooj yim thiab tus nqi qis. Thaum broadband routers tau hloov lawv hauv tsev, hubs tseem ua lub hom phiaj tseem ceeb.
Ethernet hubs txawv ntawm cov hubs ntse siv los tswj cov khoom siv ntse. Kuj tseem muaj npe hu ua USB hubs, uas yog lub hauv paus fais fab strips rau USB li.
Hub Ceev yog dab tsi?
Ethernet hubs sib txawv hauv lawv qhov ceev (network data rate, or bandwidth). Thawj Ethernet hubs tau ntsuas ntawm 10 Mbps xwb, tab sis cov niaj hnub no muaj 100 Mbps kev txhawb nqa thiab feem ntau muab ob qho tib si 10 Mbps thiab 100 Mbps peev xwm (lub npe hu ua dual-ceev lossis 10/100 hubs).
Tus naj npawb ntawm cov chaw nres nkoj Ethernet hub txhawb nqa kuj txawv. 4- thiab 5-chaw nres nkoj Ethernet hubs feem ntau muaj nyob rau hauv tsev network, tab sis 8- thiab 16-chaw nres nkoj hubs tuaj yeem pom hauv qee qhov chaw hauv tsev thiab chaw ua haujlwm me me.
Hubs tuaj yeem txuas rau ib leeg - hu ua daisy chaining - txhawm rau nthuav dav tag nrho cov khoom siv lub hub network tuaj yeem txhawb nqa.
Cov qub Ethernet hubs yog qhov loj me thiab qee zaum nrov vim tias lawv muaj cov kiv cua ua kom txias rau chav tsev. Cov khoom siv hub niaj hnub no tsis muaj suab nrov, me dua, thiab tsim los rau kev txav mus los.
Ethernet hubs ua haujlwm raws li Txheej 1 cov khoom siv hauv OSI qauv.
Passive, Active, thiab ntse Hubs
Peb hom hubs muaj nyob:
- Passive hubs tsis txhob nthuav tawm cov teeb liab hluav taws xob ntawm cov pob khoom tuaj ua ntej tshaj tawm mus rau lub network.
- Active hubs ua kom muaj zog, zoo li tus rov ua dua.
- ntse hubs ntxiv nta ntxiv rau lub chaw nquag uas tseem ceeb tshwj xeeb rau kev lag luam. Ib lub hub ntse yog feem ntau stackable, txhais tau hais tias nws tau tsim nyob rau hauv xws li ib txoj kev uas ntau chav nyob yuav muab tso rau ib sab saum toj ntawm lwm yam kom txuag tau qhov chaw. Intelligent Ethernet hubs feem ntau suav nrog kev tswj chaw taws teeb ntawm SNMP thiab virtual LAN (VLAN) kev txhawb nqa.
Lo lus concentrator yog qee zaum siv thaum xa mus rau lub hub passive, thiab multiport repeater tuaj yeem siv los piav qhia lub hub active.
Yuav Ua Li Cas Nrog Ethernet Hubs
Txhawm rau txuas ib pab pawg ntawm cov khoom siv siv Ethernet hub, ua ntej txuas Ethernet cable rau hauv chav tsev, tom qab ntawd txuas rau lwm qhov kawg ntawm cable mus rau lub cuab yeej network interface card (NIC). Tag nrho cov Ethernet hubs txais RJ-45 connectors ntawm tus qauv Ethernet cables.
Txhawm rau nthuav dav lub network kom haum ntau cov khoom siv, Ethernet hubs tuaj yeem txuas rau ib leeg, hloov pauv, lossis rau routers.
Thaum siv Ethernet Hub
Ib lub hub tuaj yeem muaj txiaj ntsig zoo rau kev hloov pauv lub network tawg ib ntus lossis nthuav dav lub network. Txawm li cas los xij, hubs yuav tsum tsuas yog siv yog tias kev ua haujlwm tsis yog qhov tseem ceeb ntawm lub network.
Hubs txawv ntawm cov keyboards thiab routers nyob rau hauv uas tag nrho cov ntaub ntawv pob khoom uas tuaj txog ntawm lub hub raug xa mus rau txhua qhov chaw nres nkoj tsis hais qhov chaw nres nkoj lub hauv paus pib siv. Qhov laj thawj yog vim li cas lub hub, tsis zoo li lub router lossis hloov, tsis paub lub cuab yeej twg thov cov ntaub ntawv. Lub network tag nrho tuaj yeem ntsib kev ua haujlwm tsis zoo raws li qhov tshwm sim.
Txawm hais tias cov hubs muaj qhov ua tau zoo sib xws, yuav luag tag nrho cov khoom siv hauv Ethernet network siv niaj hnub no siv cov hloov pauv hloov pauv, vim lawv cov txiaj ntsig kev ua tau zoo.
