Tsis ntev los no, ib tug phooj ywg tau nug, muaj pes tsawg lub network soj ntsuam lub koob yees duab tuaj yeem hloov tsav?Muaj pes tsawg gigabit keyboards tuaj yeem txuas nrog 2 lab lub koob yees duab network?24 lub taub hau network, kuv puas tuaj yeem siv 24-chaw nres nkoj 100M hloov?xws li teeb meem.Niaj hnub no, cia peb saib qhov kev sib raug zoo ntawm tus naj npawb ntawm cov chaw nres nkoj hloov thiab cov koob yees duab!
1. Xaiv raws li cov cai kwj thiab kom muaj nuj nqis ntawm lub koob yees duab
1. Lub koob yees duab code ntws
Ua ntej xaiv qhov hloov pauv, ua ntej txheeb xyuas seb bandwidth ntau npaum li cas txhua daim duab nyob.
2. Tus naj npawb ntawm lub koob yees duab
3. txhawm rau txheeb xyuas lub peev xwm bandwidth ntawm qhov hloov.Feem ntau siv cov keyboards yog 100M keyboards thiab Gigabit keyboards.Lawv qhov tseeb bandwidth feem ntau tsuas yog 60 ~ 70% ntawm tus nqi theoretical, yog li qhov muaj bandwidth ntawm lawv cov chaw nres nkoj yog kwv yees li 60Mbps lossis 600Mbps.
Piv txwv:
Saib ntawm ib qho kwj raws li hom ntawm IP lub koob yees duab koj siv, thiab tom qab ntawd kwv yees pes tsawg lub koob yees duab tuaj yeem txuas nrog lub hloov pauv.piv txwv:
①1.3 lab: Ib lub koob yees duab 960p nkaus xwb feem ntau yog 4M, nrog 100M hloov, koj tuaj yeem txuas 15 units (15 × 4 = 60M);nrog lub gigabit hloov, koj tuaj yeem txuas 150 (150 × 4 = 600M).
②2 lab: 1080P lub koob yees duab nrog ib qho kwj feem ntau 8M, nrog 100M hloov, koj tuaj yeem txuas 7 units (7 × 8 = 56M);Nrog lub gigabit hloov, koj tuaj yeem txuas 75 units (75 × 8 = 600M) Cov no yog cov khoom siv loj Siv lub koob yees duab H.264 ua piv txwv los piav qhia rau koj, H.265 tuaj yeem ua tau ib nrab.
Nyob rau hauv cov nqe lus ntawm network topology, ib cheeb tsam hauv cheeb tsam network feem ntau yog ob-rau peb-txheej qauv.Qhov kawg uas txuas rau lub koob yees duab yog txheej txheej nkag, thiab 100M hloov feem ntau txaus, tshwj tsis yog tias koj txuas ntau lub koob yees duab mus rau ib qho kev hloov.
Lub aggregation txheej thiab core txheej yuav tsum tau xam raws li pes tsawg dluab hloov aggregates.Cov txheej txheem suav yog raws li hauv qab no: yog tias txuas nrog 960P lub koob yees duab network, feem ntau hauv 15 raws ntawm cov duab, siv 100M hloov;yog tias ntau tshaj 15 channel, siv lub gigabit hloov;Yog tias txuas nrog 1080P lub koob yees duab network, feem ntau nyob rau hauv 8 raws ntawm cov duab, siv 100M hloov, ntau tshaj 8 channel siv Gigabit keyboards.
Thib ob, kev xaiv cov kev xav tau ntawm kev hloov
Lub network saib xyuas muaj peb txheej txheej txheej: txheej txheej txheej, txheej txheej, thiab txheej txheej nkag.
1. Xaiv cov txheej txheej nkag
Qhov xwm txheej 1: Lub koob yees duab code ntws: 4Mbps, 20 lub koob yees duab yog 20 * 4 = 80Mbps.
Qhov ntawd yog hais tias, qhov chaw nres nkoj upload ntawm cov txheej txheem nkag mus yuav tsum tau ua kom tau raws li qhov yuav tsum tau ua ntawm 80Mbps / s.Xav txog qhov sib kis tus nqi tiag tiag ntawm qhov hloov pauv (feem ntau yog 50% ntawm tus nqi nominal, 100M yog li 50M), yog li txheej txheej nkag Qhov hloov yuav tsum xaiv qhov hloov pauv nrog 1000M upload chaw nres nkoj.
Qhov xwm txheej 2: Lub backplane bandwidth ntawm qhov hloov, yog tias koj xaiv 24-chaw nres nkoj hloov nrog ob lub 1000M chaw nres nkoj, tag nrho ntawm 26 chaw nres nkoj, tom qab ntawd cov kev xav tau ntawm lub backplane bandwidth ntawm qhov hloov ntawm txheej nkag yog: (24 * 100M * 2 + 1000 * 2 * 2) / 1000 = 8.8Gbps backplane bandwidth.
Qhov xwm txheej 3: Pob ntawv xa mus rau tus nqi: Cov pob ntawv xa tawm ntawm 1000M chaw nres nkoj yog 1.488Mpps / s, tom qab ntawd tus nqi hloov pauv ntawm kev nkag mus rau txheej yog: (24 * 100M / 1000M + 2) * 1.488 = 6.55Mpps.
Raws li cov xwm txheej saum toj no, thaum 20 720P koob yees duab txuas nrog rau kev hloov pauv, qhov hloov yuav tsum muaj tsawg kawg yog ib qho 1000M upload chaw nres nkoj thiab ntau dua 20 100M nkag mus rau cov chaw nres nkoj kom tau raws li qhov xav tau.
2. Kev xaiv cov txheej txheej sib sau ua ke
Yog tias tag nrho ntawm 5 qhov hloov pauv tau txuas nrog, txhua qhov hloov pauv muaj 20 lub koob yees duab, thiab cov lej kwj yog 4M, tom qab ntawd cov tsheb khiav ntawm txheej txheej yog: 4Mbps * 20 * 5 = 400Mbps, ces qhov chaw nres nkoj ntawm cov txheej txheem sib sau yuav tsum yog saum toj no. 1000 M.
Yog tias 5 IPCs txuas nrog qhov hloov pauv, feem ntau yuav tsum muaj 8-chaw nres nkoj hloov, ces qhov no
Puas yog 8-chaw nres nkoj hloov tau raws li qhov xav tau?Nws tuaj yeem pom los ntawm peb yam hauv qab no:
Backplane bandwidth: tus naj npawb ntawm cov chaw nres nkoj * chaw nres nkoj ceev * 2 = backplane bandwidth, piv txwv li 8 * 100 * 2 = 1.6Gbps.
Pob ntawv pauv tus nqi: tus naj npawb ntawm cov chaw nres nkoj * chaw nres nkoj ceev / 1000 * 1.488Mpps = pob ntawv pauv tus nqi, uas yog, 8 * 100 / 1000 * 1.488 = 1.20Mpps.
Cov pob ntawv pauv tus nqi ntawm qee qhov hloov pauv qee zaum suav tias tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua, yog li nws yog qhov hloov pauv tsis-xaim, uas yooj yim ua rau qeeb thaum tuav cov khoom muaj peev xwm loj.
Cascade chaw nres nkoj bandwidth: IPC kwj * kom muaj nuj nqis = qhov tsawg kawg nkaus bandwidth ntawm qhov chaw nres nkoj upload, piv txwv li 4.*5 = 20Mbps.Nquag, thaum IPC bandwidth tshaj 45Mbps, nws raug nquahu kom siv 1000M cascade chaw nres nkoj.
3. Yuav xaiv qhov hloov pauv li cas
Piv txwv li, muaj ib lub tsev kawm ntawv network nrog ntau dua 500 lub koob yees duab siab thiab cov lej kwj ntawm 3 txog 4 megabytes.Lub network qauv tau muab faib ua txheej txheej txheej txheej txheej txheej txheej txheej.Muab khaws cia rau hauv cov txheej txheem sib sau ua ke, txhua txheej txheej sib sau ua ke rau 170 lub koob yees duab.
Cov teeb meem ntsib: yuav ua li cas xaiv cov khoom, qhov txawv ntawm 100M thiab 1000M, dab tsi yog vim li cas cuam tshuam rau kev sib kis ntawm cov duab hauv lub network, thiab dab tsi cuam tshuam nrog kev hloov pauv ...
1. Backplane bandwidth
2 npaug ntawm qhov muaj peev xwm ntawm txhua qhov chaw nres nkoj x tus naj npawb ntawm cov chaw nres nkoj yuav tsum tsawg dua li qhov nominal backplane bandwidth, ua kom tag nrho-duplex tsis thaiv cov hlau-ceev hloov pauv, ua pov thawj tias qhov hloov pauv muaj cov xwm txheej los ua kom cov ntaub ntawv hloov pauv kev ua tau zoo.
Piv txwv li: ib qho kev hloov uas tuaj yeem muab tau txog 48 Gigabit chaw nres nkoj, nws lub peev xwm tag nrho yuav tsum ncav cuag 48 × 1G × 2 = 96Gbps, kom ntseeg tau tias thaum txhua qhov chaw nres nkoj nyob hauv tag nrho duplex, nws tuaj yeem muab tsis thaiv cov xaim ceev pob ntawv hloov. .
2. Pob ntawv xa tawm tus nqi
Tag nrho configuration packet forwarding rate (Mbps) = tus naj npawb ntawm tag nrho configured GE ports × 1.488Mpps + tus naj npawb ntawm tag nrho configured 100M ports × 0.1488Mpps, thiab theoretical throughput ntawm ib lub gigabit chaw nres nkoj thaum lub pob ntawv ntev yog 64.8 bytes pps
Piv txwv li, yog tias qhov hloov pauv tuaj yeem muab tau txog 24 gigabit chaw nres nkoj thiab cov ntawv thov xa tawm tus nqi tsawg dua 35.71 Mpps (24 x 1.488Mpps = 35.71), ces nws tsim nyog xav tias qhov hloov pauv tau tsim nrog cov ntaub thaiv.
Feem ntau, ib qho kev hloov pauv nrog lub dav hlau rov qab txaus bandwidth thiab pob ntawv xa mus rau tus nqi yog qhov tsim nyog hloov.
Ib qho kev hloov pauv nrog lub dav hlau rov qab loj thiab qhov kev sib tw me me, ntxiv rau kev tuav lub peev xwm los txhim kho thiab nthuav dav, muaj teeb meem nrog software efficiency / dedicated chip Circuit Court tsim;ib tug hloov nrog ib tug kuj me me backplane thiab kuj loj throughput muaj ib tug kuj siab zuag qhia tag nrho kev ua tau zoo.
Lub koob yees duab code kwj cuam tshuam rau qhov pom tseeb, uas feem ntau yog qhov code kwj teeb tsa ntawm kev sib kis video (xws li kev nkag mus thiab kev txiav txim siab ntawm kev xa thiab txais cov khoom siv encoding, thiab lwm yam), uas yog kev ua haujlwm ntawm lub koob yees duab pem hauv ntej thiab muaj tsis muaj dab tsi ua nrog lub network.
Feem ntau cov neeg siv xav tias qhov tseeb tsis yog siab, thiab lub tswv yim hais tias nws yog tshwm sim los ntawm lub network yog qhov tseeb ntawm kev nkag siab yuam kev.
Raws li cov ntaub ntawv saum toj no, xam:
Kwj: 4Mbps
Nkag mus: 24 * 4 = 96Mbps <1000Mbps <4435.2Mbps
Aggregation: 170 * 4 = 680Mbps <1000Mbps <4435.2Mbps
3. Nkag mus
Lub ntsiab kev txiav txim siab yog qhov txuas bandwidth ntawm kev nkag mus thiab kev sib sau ua ke, uas yog, lub peev xwm uplink ntawm qhov hloov pauv yuav tsum muaj ntau dua li cov koob yees duab uas tuaj yeem haum rau tib lub sijhawm * tus lej lej.Nyob rau hauv txoj kev no, tsis muaj teeb meem nrog lub sijhawm tiag tiag video kaw, tab sis yog tias tus neeg siv saib cov yees duab hauv lub sijhawm tiag tiag, qhov bandwidth no yuav tsum tau muab coj los xav.Lub bandwidth nyob ntawm txhua tus neeg siv los saib cov yeeb yaj kiab yog 4M.Thaum ib tus neeg saib, qhov bandwidth ntawm cov koob yees duab * tus nqi me ntsis * (1 + N) yuav tsum tau, uas yog, 24 * 4 * (1 + 1) = 128M.
4. Aggregation hloov
Lub aggregation txheej yuav tsum tau ua cov 3-4M kwj (170 * 4M = 680M) ntawm 170 lub koob yees duab tib lub sij hawm, uas txhais tau hais tias lub aggregation txheej hloov yuav tsum tau txhawb ib txhij xa mus rau ntau tshaj 680M ntawm switching muaj peev xwm.Feem ntau, qhov chaw cia yog txuas nrog rau kev sib sau ua ke, yog li cov ntaub ntawv kaw cia tau xa mus rau ntawm cov xov hlau ceev.Txawm li cas los xij, xav txog qhov bandwidth ntawm kev saib thiab saib xyuas lub sijhawm tiag tiag, txhua qhov kev sib txuas nyob hauv 4M, thiab qhov txuas 1000M tuaj yeem txhawb nqa 250 lub koob yees duab kom debugged thiab hu.Txhua qhov kev nkag mus tau txuas nrog 24 lub koob yees duab, 250/24, uas txhais tau hais tias lub network tuaj yeem tiv taus qhov siab ntawm 10 tus neeg siv saib txhua lub koob yees duab nyob rau tib lub sijhawm.
5. Core hloov
Cov tub ntxhais hloov pauv yuav tsum xav txog qhov hloov pauv muaj peev xwm thiab qhov sib txuas bandwidth rau kev sib sau ua ke.Vim tias qhov chaw khaws cia tau muab tso rau ntawm cov txheej txheem sib sau ua ke, cov tub ntxhais hloov pauv tsis muaj lub siab ntawm kev kaw cov yeeb yaj kiab, uas yog, nws tsuas yog yuav tsum xav txog seb muaj pes tsawg tus neeg saib pes tsawg tus channel ntawm video tib lub sijhawm.
Piv txwv tias nyob rau hauv rooj plaub no, muaj 10 tus neeg saib xyuas tib lub sijhawm, txhua tus neeg saib 16 cov yeeb yaj kiab, uas yog, kev sib pauv peev xwm yuav tsum muaj ntau dua.
Luas = 10 x 16 = 640 m.
6. Hloov xaiv tsom xam
Thaum xaiv cov keyboards rau kev soj ntsuam video hauv ib cheeb tsam hauv cheeb tsam network, xaiv cov txheej txheem nkag thiab cov txheej txheem sib sau ua ke feem ntau tsuas yog xav txog qhov tseem ceeb ntawm kev hloov peev xwm, vim tias cov neeg siv feem ntau txuas thiab tau txais cov yeeb yaj kiab los ntawm cov keyboards tseem ceeb.Tsis tas li ntawd, txij li lub siab tseem ceeb nyob rau ntawm cov keyboards ntawm cov txheej txheem sib sau ua ke, nws tsis yog tsuas yog lub luag haujlwm rau kev saib xyuas cov tsheb thauj mus los, tab sis kuj yog lub siab ntawm kev saib thiab hu xov tooj saib xyuas hauv lub sijhawm tiag tiag, yog li nws tseem ceeb heev uas yuav tsum xaiv qhov tsim nyog aggregation. hloov.
Post lub sij hawm: Mar-17-2022