Txheej txheem cej luam ntawm Hluav Taws Xob Hluav Taws Xob (POE)
POE (Power Over Ethernet) yog hais txog qee qhov IP-based terminals (xws li IP xov tooj, wireless LAN nkag cov ntsiab lus AP, lub koob yees duab network, thiab lwm yam) yam tsis tau hloov pauv Ethernet Cat.5 cov kab hluav taws xob uas twb muaj lawm.Thaum xa cov ntaub ntawv teeb liab, nws muab DC fais fab mov tshuab rau cov khoom siv zoo li no.POE thev naus laus zis tuaj yeem ua kom muaj kev ua haujlwm ib txwm muaj ntawm lub network uas twb muaj lawm thaum ua kom muaj kev nyab xeeb ntawm cov txheej txheem cabling uas twb muaj lawm, thiab txo nqi tsawg.
POE tseem hu ua lub zog siv hluav taws xob raws li thaj chaw hauv cheeb tsam network (POL, Fais fab hla LAN) lossis Active Ethernet (Active Ethernet), qee zaum kuj hu ua Power over Ethernet luv luv.Qhov no yog siv cov qauv Ethernet kis tau tus mob uas twb muaj lawm los xa cov ntaub ntawv thiab cov ntaub ntawv tib lub sijhawm.Cov qauv tshiab thiab cov lus qhia tshwj xeeb ntawm lub zog hluav taws xob, thiab tswj kev sib raug zoo nrog Ethernet systems thiab cov neeg siv tam sim no.IEEE 802.3af tus qauv yog tus qauv tshiab raws li POE ntawm lub zog tshaj-Ethernet system.Nws ntxiv cov qauv cuam tshuam rau kev xa hluav taws xob ncaj qha los ntawm cov xov tooj hauv network raws li IEEE 802.3.Nws yog qhov txuas ntxiv ntawm tus qauv Ethernet uas twb muaj lawm thiab thawj tus qauv thoob ntiaj teb rau kev faib hluav taws xob.txheem.
IEEE tau pib tsim cov qauv hauv xyoo 1999, thiab cov neeg muag khoom koom nrog thawj zaug yog 3Com, Intel, PowerDsine, Nortel, Mitel, thiab National Semiconductor.Txawm li cas los xij, qhov tsis txaus ntawm tus qauv no tau txwv kev nthuav dav ntawm kev lag luam.Txog thaum Lub Rau Hli 2003, IEEE tau pom zoo rau 802.3af tus qauv, uas qhia meej meej txog kev kuaj xyuas hluav taws xob thiab tswj cov teeb meem hauv cov chaw taws teeb, thiab txuas nrog routers, keyboards, thiab hubs rau IP xov tooj, kev ruaj ntseg, thiab wireless hauv cheeb tsam network los ntawm Ethernet cables.Standardize lub hwj chim mov hom ntawm cov khoom xws li cov ntsiab lus.Kev txhim kho ntawm IEEE 802.3af suav nrog kev siv zog ntawm ntau lub tuam txhab cov kws tshaj lij, uas tseem tso cai rau tus qauv kom raug kuaj tag nrho.
POE system muaj pes tsawg leeg thiab cov khoom siv hluav taws xob cov yam ntxwv
POE system suav nrog cov khoom siv hluav taws xob (PSE, Cov Khoom Siv Hluav Taws Xob) thiab cov khoom siv hluav taws xob txais (PD, Cov Khoom Siv Hluav Taws Xob) qhov chaw.Cov cuab yeej PSE yog cov cuab yeej siv hluav taws xob rau ob tus neeg siv khoom siv, thiab nws kuj yog cov cuab yeej siv hluav taws xob rau tag nrho POE.Cov cuab yeej PD yog PSE uas lees txais lub zog, uas yog, tus neeg siv khoom siv ntawm POE system, xws li IP xov tooj, kev ruaj ntseg network, APs, thiab PDAs.) Los yog ntau lwm yam khoom siv xws li xov tooj ntawm tes thiab khoos phis tawj (me me, txhua yam khoom siv uas muaj zog tshaj 13W tuaj yeem tau txais lub zog sib xws los ntawm RJ45 interface).Nws tsis tso siab rau tus qauv IEEE 802.3af los tsim cov ntaub ntawv sib txuas txog cov xwm txheej kev sib txuas, hom ntaus ntawv, thiab qib ntawm cov khoom siv kawg PD, thiab tib lub sijhawm muab lub zog rau PD raws li PSE.
Cov yam ntxwv tseem ceeb ntawm cov khoom siv hluav taws xob tsis zoo ntawm POE tus qauv siv hluav taws xob yog:
◆ Qhov hluav taws xob yog nruab nrab ntawm 44V thiab 57V, nrog tus nqi raug ntawm 48V.
◆ Qhov siab tshaj plaws tam sim no yog 550mA, thiab qhov siab tshaj plaws pib tam sim no yog 500mA.
◆ Qhov nruab nrab ua hauj lwm tam sim no yog 10 ~ 350mA, thiab lub overload tam sim no yog 350 ~ 500mA.
◆ Nyob rau hauv qhov tsis muaj kev thauj khoom, qhov siab tshaj plaws tam sim no yog 5mA.
◆ Muab tsib theem ntawm kev thov hluav taws xob los ntawm 3.84 txog 12.95W rau cov khoom siv PD, nrog qhov siab tshaj plaws tsis pub tshaj 13W.
Cov txheej txheem ua haujlwm ntawm POE fais fab mov
Thaum floating PSE fais fab mov davhlau ya nyob twg cov cuab yeej hauv lub network, cov txheej txheem ua haujlwm ntawm POE fais fab mov yog raws li hauv qab no.
◆ Kev Tshawb Fawb: Thaum pib, qhov hluav taws xob tso tawm los ntawm PSE ntaus ntawv ntawm qhov chaw nres nkoj kom txog thaum nws pom tias cov ntaub ntawv davhlau ya nyob twg txuas yog lub tshuab txais hluav taws xob uas txhawb nqa tus qauv IEEE 802.3af.
◆ Kev faib cov cuab yeej PD: Tom qab kuaj pom lub tshuab txais hluav taws xob PD, cov cuab yeej PSE tuaj yeem faib cov khoom siv PD thiab ntsuas cov khoom siv hluav taws xob uas xav tau los ntawm PD.
◆ Pib fais fab mov: Thaum lub sij hawm configurable (feem ntau tsawg tshaj li 15μs) pib lub hwj chim mov, lub PSE ntaus ntawv pib muab lub hwj chim rau lub PD ntaus ntawv los ntawm ib tug tsawg voltage mus txog rau thaum nws muab ib tug 48V fais fab mov.
◆ Fais fab mov: Muab qhov ruaj khov thiab txhim khu kev qha 48V dynamic tshaj-voltage rau PD cov cuab yeej kom tau raws li lub hwj chim overtime ntawm PD cov cuab yeej uas tsis pub tshaj 15.4W.
◆ Fais fab tuag: Yog tias lub cuab yeej PD raug txiav tawm ntawm lub network, PSE yuav sai sai (feem ntau nyob rau hauv 30-400ms) nres lub zog ntawm PD, thiab rov ua cov txheej txheem tshawb nrhiav kom paub seb cov ntaub ntawv davhlau ya nyob twg txuas nrog PD ntaus ntawv.
Thaum txuas ib qho khoom siv network rau PSE, PSE yuav tsum xub kuaj pom tias lub cuab yeej tsis yog PD kom ntseeg tau tias nws tsis muab tam sim no rau cov khoom siv uas tsis ua raws li tus qauv POE, uas yuav ua rau muaj kev puas tsuaj.Nws tuaj yeem pom tau los ntawm kev nrhiav qhov me me ntawm qhov hluav taws xob tam sim no los xyuas seb qhov kev ncua deb puas muaj cov yam ntxwv uas ua tau raws li qhov yuav tsum tau ua.Tsuas yog thaum kuaj pom tau tuaj yeem muab tag nrho 48V voltage, tam sim no tseem muaj, thiab cov khoom siv luv luv luv yuav muaj qhov yuam kev..Raws li kev txuas ntxiv PD ntawm cov txheej txheem tshawb pom, nws tseem tuaj yeem faib cov hom khoom siv hluav taws xob uas xav tau PSE, thiab muab PSE los muab lub zog ua haujlwm tau zoo.PSE pib muab lub zog.Nws tseem yuav saib xyuas PD cov tswv yim tam sim no.Thaum PD tam sim no noj poob qis dua tus nqi qis, xws li thaum lub cuab yeej tsis txuas lossis ntsib lub zog siv ntau dhau ntawm cov khoom siv PD, luv luv Circuit Court, lossis cov khoom siv hluav taws xob ntau tshaj qhov PSE, PSE yuav rhuav tshem cov khoom siv hluav taws xob thiab pib tshawb nrhiav. txheej txheem dua.
Cov cuab yeej siv hluav taws xob kuj tuaj yeem muab nrog lub peev xwm ua haujlwm, piv txwv li, daim ntawv thov kev sib txuas lus yooj yim (SNMP).Kev ua haujlwm tuaj yeem muab cov haujlwm xws li kev rov ua haujlwm rov qab thiab kev tswj xyuas rov qab.
Nws tuaj yeem kawm txog hom kev sib kis ntawm POE.Muaj ob qhov teeb meem tseem ceeb uas yuav tsum xav txog hauv cov txheej txheem ntawm kev muab, uas yog kev txheeb xyuas cov khoom siv PD, thiab lwm yam yog lub peev xwm ntawm UPS hauv qhov system.