1 Nhanganyaya
PoE inonziwo Simba pamusoro peLAN (PoL) kana Active Ethernet, dzimwe nguva inonzi Simba pamusoro peEthernet kwenguva pfupi. Iyi ndiyo yazvino chiyero dhizaini inoshandisa iripo yakajairwa Ethernet tambo dzekutumira kufambisa data nesimba panguva imwe chete, uye inochengetedza kuenderana neiripo Ethernet masisitimu nevashandisi. Iyo IEEE 802.3af chiyero chiyero chitsva chakavakirwa paPOE yePower-over-Ethernet system. Iyo inowedzera yakabatana zviyero zveyakananga magetsi magetsi kuburikidza netiweki tambo pahwaro hweIEEE 802.3. Iyo yekuwedzera yeiyo iripo Ethernet chiyero uye yekutanga chiyero chepasi rose chekugovera magetsi. standard.
IEEE yakatanga kuvandudza mwero muna 1999, uye vatengesi vekutanga kutora chikamu vaive 3Com, Intel, PowerDsine, Nortel, Mitel, uye National Semiconductor. Nekudaro, kushaikwa kweiyo chiyero kwave kuganhurira kuwedzera kwemusika. Kusvika muna Chikumi 2003, iyo IEEE yakabvumidza iyo 802.3af chiyero, iyo yakanyatsojekesa magetsi ekuona uye kutonga zvinhu mumasisitimu ari kure, uye akabatana.routers, switch, uye hubs kumafoni eIP, masisitimu ekuchengetedza, uye mawaya emunharaunda nharaunda network kuburikidza netambo dzeEthernet. Iyo nzira yekupa magetsi yemapoinzi nemimwe michina inodzorwa. Kuvandudzwa kweIEEE 802.3af kunosanganisira kuedza kwenyanzvi dzakawanda dzekambani, izvo zvinobvumirawo mwero kuti uedzwe zvizere.
Yakajairika simba pamusoro peEthernet system. Isa iyo Ethernetchinjamidziyo muwadhiropu yewaya, uye shandisa hubhu yepakati nepakati ine hubhu yemagetsi kupa simba kune yakamonyoroka peya yeLAN. Pakupera kwemaviri akamonyoroka, simba rekushandisa rinoshandiswa kusimba mafoni, isina waya yekuwana nzvimbo, makamera, uye mamwe madivayiri. Kuti udzivise kudzimwa kwemagetsi, UPS inogona kushandiswa.
2 musimboti
Iyo yakajairwa Chikamu 5 network tambo ine mapeya mana eakamonyoroka maviri, asi maviri chete ndiwo anoshandiswa mul0M BASE-T uye 100M BASE-T. IEEE80 2.3af inobvumira kushandiswa kuviri. Kana pini isina basa ichishandiswa kugovera magetsi, mapini 4 ne5 anobatanidzwa sedanda rakanaka, uye mapini 7 ne8 akabatanidzwa sedanda risina kunaka.
Kana pini yedata ichishandiswa kugovera magetsi, magetsi eDC anowedzerwa pakati peiyo transmission transformer, iyo isingakanganisi kuendesa data. Nenzira iyi, peya 1, 2 uye peya 3, 6 inogona kuva chero polarity.
Chiyero hachibvumire kushandiswa kweaya ari pamusoro apa mamiriro panguva imwe chete. Iyo magetsi ekushandisa PSE inogona kungopa imwe chete kushandiswa, asi magetsi ekushandisa PD inofanirwa kukwanisa kuchinjika kune ese ari maviri mamiriro panguva imwe chete. Chiyero chinotara kuti magetsi anowanzo 48V, 13W. Zviri nyore kumidziyo yePD kupa 48V kune yakaderera voltage kutendeuka, asi panguva imwe chete iyo inofanirwa kuve ine insulation kuchengetedza voltage ye1500V.
3 parameters
Iyo yakazara POE sisitimu inosanganisira zvikamu zviviri: magetsi emagetsi ekushandisa (PSE) uye magetsi ekushandisa (PD). Iyo PSE mudziyo mudziyo unopa simba kuEthernet mutengi mudziyo, uye zvakare ari maneja weiyo yese POE Ethernet magetsi ekupa maitiro. Iyo PD mudziyo iPSE mutoro unogamuchira simba, kureva, mutengi mudziyo wePOE system, senge IP mafoni, network kuchengetedza makamera, APs, uye mamwe akawanda maEthernet madivayiri, akadai sePDA kana nhare mbozha (chaizvoizvo, chero simba risingapfuuri 13W Chigadzirwa chacho chinogona kuwana simba rinoenderana kubva kuRJ45 socket). Iwo maviri akavakirwa paIEEE 802.3af chiyero uye anomisikidza chinongedzo kuburikidza nePD yekubatanidza, rudzi rwechishandiso, chiyero chekushandiswa kwesimba uye mamwe ruzivo rwechigadziro chekugamuchira simba, uye pachikonzero ichi, PD inofambiswa nePSE kuburikidza neEthernet.
Iwo makuru emagetsi ekupa hunhu maparamita ePOE akajairwa magetsi emagetsi system ndeaya:
1. Mhepo iri pakati pe44V ne57V, ine kukosha kwe48V.
2. Iyo yakawanda inobvumirwa ikozvino ndeye 550mA, uye yakanyanya kutanga ikozvino 500mA.
3. Iyo yakajairika kushanda ikozvino 10-350mA, uye iyo yakawandisa yekuona ikozvino ndeye 350-500mA.
4. Pasi pemamiriro asina mutoro, iyo yakawanda inodiwa ikozvino 5mA.
5. Ipa matanho matatu emagetsi emagetsi anodiwa e3.84～12.95W yePD midziyo, iyo yakawanda haipfuuri 13W. (Cherechedza kuti PD mazinga 0 uye 4 haana kuratidzwa uye haafanire kushandiswa.)
4 kushanda maitiro
Pakuronga PSE magetsi emagetsi emagetsi emagetsi munetiweki, maitiro ekushanda ePOE Simba pamusoro peEthernet anoratidzwa pazasi.
1. Kuonekwa
Pakutanga, mudziyo wePSE unoburitsa volti diki pachiteshi kusvika yaona kuti kubatana kwetambo terminal mudziyo unogamuchira simba unotsigira IEEE 802.3af standard.
2. PD mudziyo kupatsanura
Kana iyo PD yemuchina wekugashira waonekwa, iyo PSE mudziyo inogona kurongedza iyo PD mudziyo uye kuongorora kurasikirwa kwesimba kunodiwa nePD mudziyo.
Munguva yekutanga yenguva inogadziriswa (kazhinji isingasviki 15μs), mudziyo wePSE unotanga kupa simba kuPD mudziyo kubva pamhepo yakaderera kusvika yapa 48V DC magetsi.
4. Simba rekupa
Inopa yakagadzikana uye yakavimbika 48V DC simba rePD midziyo yekusangana nekushandiswa kwesimba kwePD michina isingapfuure 15.4W.
5. Kudzima
Kana iyo PD dhizaini yakabviswa kubva kune network, iyo PSE ichakurumidza (kazhinji mukati me300-400ms) kumisa simba PD mudziyo, uye dzokorora nzira yekuona kuti ione kana iyo terminal yetambo yakabatana kune PD mudziyo.
5 simba rekupa nzira
Iyo PoE chiyero inotsanangura nzira mbiri dzekushandisa Ethernet tambo dzekutumira kuendesa DC simba kuPOE-inoenderana michina:
1.Mid-Span
Shandisa tambo dzisina kushandiswa dzisina basa muEthernet tambo kutumira DC simba. Inoshandiswa pakati peyakajairwa switch uye network terminal michina. Inogona kupa simba kune network terminal michina kuburikidza netiweki tambo. Midspan PSE (yepakati-span magetsi emagetsi ekushandisa) yakakosha magetsi manejimendi Equipment, inowanzoiswa pamwe chete neiyochinja. Iyo ine maviri maRJ45 jacks anoenderana nechiteshi chimwe nechimwe, imwe yakabatana kune iyochinjanetambo pfupi, uye imwe yacho yakabatana nemudziyo uri kure.
End-Span
Iyo yakananga ikozvino inofambiswa panguva imwe chete pane yakakosha waya inoshandiswa pakufambisa data, uye kutapurirana kwayo kunoshandisa frequency yakasiyana kubva kune Ethernet data chiratidzo. Iyo inoenderana Endpoint PSE (terminal magetsi ekushandisa) ine Ethernetchinja, router, hub kana imwe network inoshandura michina inotsigira basa rePOE. Zvinoonekwa kuti End-Span ichasimudzirwa nekukurumidza. Izvi zvinodaro nekuti iyo Ethernet data uye simba rekufambisa zvinoshandisa vaviri vakafanana, izvo zvinobvisa kukosha kwekumisikidza mutsara wakatsaurirwa wekuzvimiririra kufambisa simba. Iyi ndeye 8-musimboti tambo uye inofananidzira chiyero RJ- Iyo 45 socket inonyanya kukosha.
6 budiriro
PowerDsine, simba-pamusoro-Ethernet chip mugadziri, ichaita musangano weIEEE kuendesa zviri pamutemo "high-simba simba-pamusoro-Ethernet" chiyero, icho chinotsigira magetsi ekushandisa malaptops nemimwe michina. PowerDsine ichaendesa bepa jena, ichikurudzira kuti iyo 802.3af yakajairwa 48v yekupinda uye 13w iripo muganho wemagetsi unofanirwa kupetwa kaviri. Pamusoro pemakomputa emabhuku, iyo nyowani chiyero inogona zvakare simba remvura crystal kuratidza uye vhidhiyo mafoni. Musi wa30 Gumiguru, 2009, IEEE yakabudisa itsva 802.3at standard, iyo inotaura kuti POE inogona kupa simba repamusoro, rinopfuura 13W uye rinogona kusvika 30W!