1. Intshayelelo
I-PoE ikwabizwa ngokuba yi-Power over LAN (PoL) okanye i-Active Ethernet, ngamanye amaxesha ibizwa ngokuba yi-Power over Ethernet ngokufutshane. Le yinkcazo yemigangatho yamva nje esebenzisa iintambo zothumelo lwe-Ethernet ezikhoyo zokuhambisa idatha kunye namandla ngexesha elinye, kwaye igcina ukuhambelana neenkqubo ze-Ethernet ezikhoyo kunye nabasebenzisi. Umgangatho we-IEEE 802.3af ngumgangatho omtsha osekelwe kwi-POE ye-Power-over-Ethernet system. Yongeza imigangatho enxulumeneyo yonikezelo lwamandla ngokuthe ngqo ngeentambo zenethiwekhi ngokwesiseko se-IEEE 802.3. Kukwandiswa komgangatho okhoyo we-Ethernet kunye nomgangatho wokuqala wamazwe ngamazwe wokusasazwa kwamandla. umgangatho.
I-IEEE yaqala ukuphuhlisa umgangatho ngo-1999, kwaye abathengisi bokuqala abathatha inxaxheba yayiyi-3Com, Intel, PowerDsine, Nortel, Mitel, kunye ne-National Semiconductor. Nangona kunjalo, ukunqongophala kwalo mgangatho kuthintele ukwandiswa kweemarike. Kuze kube nguJuni ka-2003, i-IEEE yavuma umgangatho we-802.3af, ochaza ngokucacileyo ukufunyanwa kwamandla kunye nokulawula izinto kwiinkqubo ezikude, kunye nokudibanisa.iirotha, utshintsho, kunye nee-hubs kwiifowuni ze-IP, iinkqubo zokhuseleko, kunye neenethiwekhi zendawo ezingenazintambo ngeentambo ze-Ethernet. Indlela yokunikezelwa kwamandla kumanqaku kunye nezinye izixhobo zilawulwa. Uphuhliso lwe-IEEE 802.3af lubandakanya iinzame zeengcali ezininzi zeenkampani, ezivumela ukuba umgangatho uvavanywe ngokupheleleyo.
Amandla aqhelekileyo ngaphezulu kwenkqubo ye-Ethernet. Beka i-Ethernettshintshaizixhobo kwigunjana locingo, kwaye usebenzise hub mid-span kunye hub amandla ukubonelela amandla iperi ejijekileyo LAN. Ekupheleni kwesibini esijijekileyo, ukunikezelwa kwamandla kusetyenziselwa iifowuni zombane, iindawo zokufikelela ezingenazintambo, iikhamera kunye nezinye izixhobo. Ukuthintela ukuphuma kombane, i-UPS ingasetyenziswa.
2 umgaqo
I-standard ye-network cable ye-Category 5 ineeperi ezine zee-twisted pairs, kodwa zimbini kuphela ezisetyenziswa kwi-l0M BASE-T kunye ne-100M BASE-T. IEEE80 2.3af ivumela ukusetyenziswa kabini. Xa i-pin engasebenziyo isetyenziselwa ukunikezelwa kwamandla, izikhonkwane ze-4 kunye ne-5 zixhunyiwe njengepali efanelekileyo, kwaye i-7 kunye ne-8 idibaniswe njengepali engafanelekanga.
Xa i-pin yedatha isetyenziselwa ukunikezelwa kwamandla, unikezelo lwamandla lwe-DC longezwa kwi-midpoint ye-transmission transformer, engachaphazeli ukuhanjiswa kwedatha. Ngale ndlela, isibini 1, 2 kunye nesibini 3, 6 sinokuba nayiphi na i-polarity.
Umgangatho awukuvumeli ukusetyenziswa kwale miqathango mibini ingentla ngexesha elinye. Izixhobo zonikezelo lwamandla i-PSE inokubonelela ngokusetyenziswa enye kuphela, kodwa izixhobo zesicelo sombane iPD kufuneka ikwazi ukuziqhelanisa neemeko zombini ngaxeshanye. Umgangatho umisela ukuba unikezelo lwamandla ludla ngokuba yi-48V, 13W. Kulula kwizixhobo zePD ukubonelela nge-48V ukuya kuguqulo lombane ophantsi, kodwa kwangaxeshanye kufuneka ibe ne-voltage yokhuseleko lwe-insulation ye-1500V.
Iiparamitha ezi-3
Inkqubo ye-POE epheleleyo iquka iinxalenye ezimbini: izixhobo zokubonelela ngombane (PSE) kunye nezixhobo zokubonelela ngombane (PD). Isixhobo se-PSE sisixhobo esinika amandla kwisixhobo somxhasi we-Ethernet, kwaye ikwangumphathi wayo yonke inkqubo yonikezelo lwamandla e-POE Ethernet. Isixhobo se-PD ngumthwalo we-PSE owamkela amandla, oko kukuthi, isixhobo somthengi wenkqubo ye-POE, njengeefowuni ze-IP, iikhamera zokhuseleko zenethiwekhi, ii-APs, kunye nezinye izixhobo ze-Ethernet ezininzi, ezifana nee-PDA okanye iishaja zefowuni eziphathwayo (enyanisweni, iifowuni ze-intanethi, kunye nezinye izixhobo ze-Ethernet, kunye neefowuni eziphathwayo, kunye neefowuni ze-intanethi, kunye nezixhobo ze-PDA, i-PSE, i-PSE, i-PCE, i-PCE, i-PCE, i-PCE, i-PCE, i-PCE, i-device ye-POE. nawaphi na amandla akadluli i-13W Isixhobo sinokufumana amandla ahambelanayo kwi-socket ye-RJ45). Ezi zimbini zisekelwe kumgangatho we-IEEE 802.3af kunye nokuseka uxhulumaniso ngokusebenzisa uxhulumaniso lwePD, uhlobo lwesixhobo, inqanaba lokusetyenziswa kwamandla kunye nolunye ulwazi lwesixhobo sokufumana amandla, kwaye kwesi siseko, i-PD inikwe amandla yi-PSE nge-Ethernet.
Iimpawu eziphambili zobonelelo lwamandla eeparamitha zenkqubo yonikezelo lwamandla esemgangathweni ye-POE zezi:
1. I-voltage iphakathi kwe-44V kunye ne-57V, enexabiso eliqhelekileyo le-48V.
2. Ubuninzi obuvumelekileyo bangoku yi-550mA, kwaye ubuninzi bokuqalisa ngoku yi-500mA.
3. Umsebenzi oqhelekileyo wangoku ngu-10-350mA, kwaye ukufumanisa ukugqithiswa kwangoku yi-350-500mA.
4. Phantsi kweemeko zokungabikho komthwalo, ubuninzi obufunekayo ngoku yi-5mA.
5. Ukubonelela ngemigangatho emithathu yeemfuno zamandla ombane we-3.84～12.95W kwisixhobo sePD, ubuninzi abudluli kwi-13W. (Qaphela ukuba amanqanaba e-PD 0 kunye ne-4 awaboniswanga kwaye akufanele asetyenziswe.)
4 inkqubo yokusebenza
Xa ulungiselela i-PSE izixhobo ze-terminal zonikezelo lwamandla kwinethiwekhi, inkqubo yokusebenza ye-POE Power phezu kwe-Ethernet iboniswe ngezantsi.
1. Ukufunyanwa
Ekuqaleni, isixhobo se-PSE sikhupha i-voltage encinci kakhulu kwi-port de ibone ukuba uqhagamshelo lwe-terminal terminal sisixhobo sokufumana amandla esixhasa umgangatho we-IEEE 802.3af.
2. Ukuhlelwa kwesixhobo sePD
Xa i-PD yesixhobo sokugqibela sokufumana ifunyenwe, isixhobo se-PSE sinokuhlela isixhobo sePD kwaye sivavanye ukulahleka kwamandla okufunwa sisixhobo sePD.
Ngexesha lokuqalisa kwexesha elilungelelanisiweyo (ngokubanzi ngaphantsi kwe-15μs), isixhobo se-PSE siqalisa ukubonelela ngombane kwisixhobo sePD ukusuka kumbane ophantsi de kube sibonelela ngombane we-48V DC.
4. Unikezelo lwamandla
Inika amandla e-48V DC azinzileyo kwaye athembekileyo kwizixhobo zePD ukuhlangabezana nokusetyenziswa kwamandla kwezixhobo zePD ezingadluli kwi-15.4W.
5. Cima umbane
Ukuba isixhobo sePD sinqanyuliwe kwinethiwekhi, i-PSE iya kukhawuleza (ngokuqhelekileyo ngaphakathi kwe-300-400ms) imise amandla kwisixhobo sePD, kwaye iphinda inkqubo yokufumanisa ukuba i-terminal yentambo ixhunyiwe kwisixhobo sePD.
5 indlela yokubonelela ngombane
Umgangatho we-PoE uchaza iindlela ezimbini zokusebenzisa iintambo zothumelo lwe-Ethernet ukuhambisa amandla eDC kwizixhobo ezihambelana ne-POE:
1.Mid-Span
Sebenzisa iiperi zocingo ezingasetyenziswanga kwintambo ye-Ethernet ukusasaza amandla eDC. Isetyenziswa phakathi kokutshintsha okuqhelekileyo kunye nesixhobo se-terminal yenethiwekhi. Inokubonelela ngamandla kwisixhobo se-terminal yenethiwekhi ngentambo yenethiwekhi. I-Midspan PSE (isixhobo sonikezelo lwamandla esiphakathi) sisixhobo esikhethekileyo solawulo lwamandla, esihlala sidityaniswa kunyetshintsha. It has iijack ezimbini RJ45 ehambelana kwizibuko ngalinye, enye idityaniswe kwitshintshangentambo emfutshane, kwaye enye iqhagamshelwe kwisixhobo esikude.
Isiphelo-Ixesha
Umbane othe ngqo uhanjiswa ngaxeshanye kwingcingo engundoqo esetyenziselwa ukuhanjiswa kwedatha, kwaye ukuhanjiswa kwayo kusebenzisa i-frequency eyahlukileyo ukusuka kwisignali yedatha ye-Ethernet. I-Endpoint PSE ehambelanayo (izixhobo zokubonelela umbane we-terminal) ine-Ethernettshintsha, umzila, hub okanye ezinye izixhobo zokutshintsha inethiwekhi ezixhasa umsebenzi we-POE. Kubonwa kwangaphambili ukuba i-End-Span iya kunyuswa ngokukhawuleza. Oku kungenxa yokuba idatha ye-Ethernet kunye nokuhanjiswa kwamandla kusebenzisa isibini esiqhelekileyo, esiphelisa isidingo sokumisela umgca ozinikeleyo wokuhanjiswa kwamandla okuzimeleyo. Oku kuphela kwe-8-core cables kunye nomgangatho ohambelanayo we-RJ- I-socket ye-45 ibaluleke kakhulu.
6 uphuhliso
I-PowerDsine, umenzi we-chip we-power-over-Ethernet, uya kubamba intlanganiso ye-IEEE ukuze angenise ngokusemthethweni umgangatho we-"high-power-over-Ethernet", oya kuxhasa ukunikezelwa kwamandla kwiilaptops kunye nezinye izixhobo. I-PowerDsine iya kungenisa iphepha elimhlophe, icebisa ukuba igalelo le-802.3af eliqhelekileyo le-48v kunye ne-13w ekhoyo yomda wamandla kufuneka uphindwe kabini. Ukongeza kwiikhompyuter zeencwadana, umgangatho omtsha unokuphinda ubonise ikristale yolwelo kunye neefowuni zevidiyo. Ngo-Oktobha 30, 2009, i-IEEE ikhuphe umgangatho omtsha we-802.3at, ochaza ukuba i-POE inokubonelela ngamandla aphezulu, angaphezu kwe-13W kwaye inokufikelela kwi-30W!