Hais txog lub hwj chim mov nrug ntawmPOE hloov
PoE fais fab mov nrug yog txiav txim siab los ntawm cov ntaub ntawv teeb liab thiab kev sib kis deb, thiab qhov sib kis ntawm cov ntaub ntawv teeb liab yog txiav txim siab los ntawm lub network cable.

1. Network cable yuav tsum Qhov qis dua impedance ntawm lub network cable, qhov ntev ntawm kev sib kis deb, yog li ua ntej ntawm tag nrho cov, qhov zoo ntawm lub network cable yuav tsum tau guaranteed, thiab qhov zoo ntawm lub network cable yuav tsum tau muas.Nws raug nquahu kom siv super-qeb 5 network cable.Qhov kev ncua deb ntawm qhov zoo tib yam qeb 5 cable cov ntaub ntawv qhia txog 100 meters.
Txij li thaum muaj ob tus qauv PoE: IEEE802.af thiab IEEE802.3at cov qauv, lawv muaj cov kev cai sib txawv rau Cat5e network cables, thiab qhov sib txawv yog feem ntau cuam tshuam rau qhov sib npaug impedance.Piv txwv li, rau 100-meter Category 5e network cable, qhov sib npaug impedance ntawm IEEE802.3at yuav tsum tsawg dua 12.5 ohms, thiab ntawm IEEE802.3af yuav tsum tsawg dua 20 ohms.Nws tuaj yeem pom tias qhov me dua qhov sib npaug impedance yog, qhov deb ntawm qhov kis tau tus mob yog.

2. PoE txuj
Txhawm rau kom ntseeg tau qhov kev sib kis ntawm PoE hloov, nws nyob ntawm qhov tso zis hluav taws xob ntawm PoE fais fab mov.Nws yuav tsum siab npaum li qhov ua tau raws li tus qauv (44-57VDC).Cov zis voltage ntawm PoE hloov chaw nres nkoj yuav tsum ua raws li IEEE802.3af / ntawm tus qauv.

Cov kev phom sij zais ntawm qhov tsis yog tus qauv POE keyboards
Tsis yog-tus qauv PoE fais fab mov yog txheeb ze rau tus qauv PoE fais fab mov.Nws tsis muaj PoE tswj nti sab hauv, thiab tsis muaj cov kauj ruam tshawb nrhiav.Nws yuav muab lub zog rau IP davhlau ya nyob twg txawm tias nws txhawb PoE.Yog hais tias tus IP davhlau ya nyob twg tsis muaj PoE fais fab mov, nws muaj feem yuav Hlawv lub network chaw nres nkoj.

1. Xaiv tsawg dua "tsis yog tus qauv" PoE
Thaum xaiv qhov hloov pauv PoE, sim xaiv tus qauv, uas muaj qhov zoo hauv qab no:
Lub hwj huam mov kawg (PSE) thiab lub zog txais qhov kawg (PD) tuaj yeem nkag siab zoo thiab kho cov khoom siv hluav taws xob.
Tiv thaiv qhov kawg tau txais txiaj ntsig zoo (feem ntau yog IPC) los ntawm kev kub hnyiab los ntawm hluav taws xob (lwm yam xws li luv luv Circuit Court, surge tiv thaiv, thiab lwm yam).
Nws tuaj yeem paub tseeb tias lub davhlau ya nyob twg txhawb nqa PoE, thiab yuav tsis muab lub zog thaum txuas mus rau lub davhlau ya nyob twg uas tsis yog PoE.

Tsis-standard PoE keyboardsfeem ntau tsis muaj qhov ntsuas kev ruaj ntseg saum toj no txhawm rau txuag cov nqi, yog li muaj qee yam kev nyab xeeb.Txawm li cas los xij, nws tsis tau txhais hais tias tsis yog tus qauv PoE siv tsis tau.Thaum qhov hluav taws xob ntawm qhov tsis yog tus qauv PoE phim qhov voltage ntawm cov khoom siv hluav taws xob, nws kuj tuaj yeem siv tau thiab tuaj yeem txo cov nqi.

2. Tsis txhob siv PoE " cuav".Cov khoom siv PoE cuav tsuas yog muab DC lub zog rau hauv lub network cable los ntawm PoE cov khoom sib txuas.Lawv tsis tuaj yeem siv los ntawm tus qauv PoE hloov pauv, txwv tsis pub lub cuab yeej yuav hlawv, yog li tsis txhob siv cov khoom siv PoE cuav.Hauv kev siv engineering, nws tsis yog tsuas yog yuav tsum xaiv cov qauv PoE keyboards, tab sis kuj tseem muaj cov qauv PoE terminals.

Hais txog qhov teeb meem cascading ntawm qhov hloov
Tus naj npawb ntawm cov khaubncaws sab nraud povtseg ntawm cascaded keyboards suav nrog kev suav ntawm bandwidth, piv txwv yooj yim:
Yog tias qhov hloov pauv nrog 100Mbps network chaw nres nkoj yog cascaded mus rau qhov chaw, qhov bandwidth zoo yog 45Mbps (bandwidth siv ≈ 45%).Yog tias txhua qhov hloov pauv tau txuas nrog cov cuab yeej saib xyuas nrog tag nrho tus nqi me ntsis ntawm 15M, uas suav rau 15M ntawm qhov bandwidth ntawm ib qho kev hloov, ces 45/15≈3, 3 keyboards tuaj yeem raug cascaded.
Vim li cas qhov kev siv bandwidth kwv yees li ntawm 45%?Qhov tseeb Ethernet IP pob ntawv header suav txog li 25% ntawm tag nrho cov tsheb khiav, qhov tseeb muaj qhov sib txuas bandwidth yog 75%, thiab qhov tshwj xeeb bandwidth yog suav tias yog 30% hauv cov ntawv thov, yog li kev siv bandwidth kwv yees li 45%. .

Hais txog kev hloov chaw nres nkoj txheeb xyuas
1. Nkag mus thiab uplink ports
Hloov cov chaw nres nkoj tau muab faib rau hauv kev nkag mus thiab cov chaw nres nkoj uplink kom zoo dua qhov kev pabcuam sib txawv thiab ua kom yooj yim txij nkawm, yog li qhia qhov txawv chaw nres nkoj.
Chaw nres nkoj nkag: Raws li lub npe qhia, nws yog qhov sib txuas ncaj qha mus rau lub davhlau ya nyob twg (IPC, wireless AP, PC, thiab lwm yam)
Uplink chaw nres nkoj: Qhov chaw nres nkoj txuas nrog kev sib sau ua ke lossis cov tub ntxhais sib txuas, feem ntau nrog tus nqi sib txuas siab dua, tsis txhawb nqa PoE muaj nuj nqi.