Ib tug network hub. hauv paus ntsiab lus ntawm cov lag luam

Network hub, txwv tsis pub lub npe hu ua ib tug hub - xws li ib tug uas combines ntau Ethernet-pab kiag li lawm rau ib tus hluas network ya. Devices kev cob cog rua rau lub hub ntawm fiber optic los yog coaxial cables. Nws yog siv rau lub hom phiaj no thiab Twisted Khub. Lub hauv paus ntsiab lus ntawm cov lag luam yog yooj yim hub: nws multiplies tag nrho cov tau txais cov ntaub ntawv packets thiab xa lawv mus rau tag nrho kev cob cog rua ports.

Hub network, raws li zoo li lwm hom concentrators, nws muaj nws qhov zoo yam ntxwv. Ua ntej, qhov kev kawm thiab tus nqi nyob rau hauv lub xov tooj ntawm hub ports. Qhov ntau Ethernet-kev cob cog rua pab kiag li lawm rau nws, tus zoo dua qhov kev ua tau zoo thiab tus nqi ntawm cov concentrator. Feem ntau, lub hub yog txawm peem rau nrog ib tug txawm tooj ntawm slots, uas nws tus xov tooj yog hom twg los ntawm plaub mus rau 24, tab sis ib txhia hom muaj tsib outputs. Cov nab npawb ntawm cov ports yuav muab ntau zog los ntawm combining ob peb cascaded hubs. Rau xws li ib tug kev twb kev txuas nyob rau hauv txhua lub hub muaj ib tug tshwj xeeb connector.

Nws muaj ib tug hub thiab lwm tseem ceeb cov yam ntxwv - cov kev ceev ntawm luam thiab hloov cov ntaub ntawv packets. Ib txhia hubs muaj peev xwm thiab zmenyat nws ceev nyob rau hauv lub chav kaum rau ib puas megabits ib ob. Nyob rau hauv xws li, nws yog hloov nyob rau hauv ob txoj kev: yog txiav los yog manually ntawm ib tug mus. Nyob rau hauv no set ceev siv rau tag nrho cov active ports. Txawv hubs thiab network xov xwm hom. Feem ntau, qhov no luag hauj lwm mus rau ib tug fiber optic cable los yog cov khub, tab sis muaj hubs uas txhawb thiab lwm yam kev xov xwm. Muaj kuj hubs rau mixed hom, xws li txhawb "hybrid" lub twisted officers mus rau lub coaxial cable.

Lub hauv paus ntsiab lus ntawm cov lag luam yog heev imperfect hubs. Ib tug cov ntaub ntawv tuaj rau lawv tuaj los ntawm ib tug channel, lub network hub rau tag nrho cov ntawv luam tseg raws kev cob cog rua thereto, uas zoo heev thiaj li muaj cov kev ceev ntawm lub Internet vim hais tias tag nrho cov Web pab kiag li lawm yog kev cob cog rua rau ib tug network ntawm ib qho channel. Yog hais tias ob packets yog theej ib txhij, kev sib tsoo tej zaum yuav tshwm sim, i.e. kev sib tsoo tib yam Pib ntsais koj teeb nyob rau hauv uas ib txhia cov ntaub ntawv no yuav ploj. Ib txhia hom hubs muaj kev tiv thaiv los ntawm ntau ntau collisions. Raws li ib tug txoj cai, lawv yog raws li nyob rau hauv cov khub. Yog hais tias nws yog ua tau cais tawm ib zaug xwb tsis ua hauj lwm ntaus ntawv, thaum lub sij hawm hub yog kev cob cog rua ntawm coaxial cable, disables tag nrho ya tam sim ntawd.

Nws muaj feem xyuam rau lub hauv paus ntsiab lus ntawm cov lag luam ntawm hub thiab nyob rau cov ntaub ntawv kev ruaj ntseg. Yog hais tias lub computer yog ib feem ntawm ib lub zos cheeb tsam network, ib tug system ntawm cov ntaub ntawv packets ncav rau tag nrho cov lwm yam ntshav. Vim li no, tag nrho cov tus kheej tej chaw ntawm kev tes hauj lwm, blogs, passwords, forums, thiab lwm yam ntaub ntawv tus kheej tej zaum yuav ua paub rau tag nrho cov mej zeej ntawm lub network. Vim li no, USB-AC Hub yog nce hloov los ntawm lub network hub los yog hloov. Qhov no ntaus ntawv tau txais lub erroneous title ntawm "Ntse Hub", distinguishes ntawm ib tug MAC chaw nyob muaj nyob rau hauv lub computer network thiab xa cov ntaub ntawv tsuas rau ib tug neeg xaiv qhov chaw nres nkoj. Tej pob khoom li kis tau los ntawm ib tug tsis, uas tiv thaiv qhov tshwm sim ntawm collisions, overload, thiab to ntawm cov ntaub ntawv kab. Ua tsaug rau cov ntseeg thiab cov uas tsis muaj nqi, cov keyboards yog nce siv nyob rau hauv lub tsev systems, thaum lub hubs yog yuav luag tsis rau cov muag khoom.