Nezve nhambwe yekupa magetsi yePOE inochinja
Iyo PoE simba rekupa kureba inotarwa neiyo data chiratidzo uye kureba kwekufambisa, uye kureba kwekufambisa kwechiratidzo che data kunotarwa netambo yetiweki.

1. Network tambo zvinodiwa Inodzika iyo impedance yetambo yetiweki, iyo yakareba kureba kwekufambisa, saka chekutanga pane zvese, kunaka kwetambo yetiweki kunofanirwa kuvimbiswa, uye mhando yetambo yetiweki inofanira kutengwa.Inokurudzirwa kushandisa super-category 5 network tambo.Iyo yekufambisa kureba yeakajairwa chikamu 5 tambo data masaini angangoita zana metres.
Sezvo kuine mipimo miviri yePoE: IEEE802.af uye IEEE802.3at zviyero, vane zvinodiwa zvakasiyana zveCat5e network cables, uye musiyano unonyanya kuratidzwa mune yakaenzana impedance.Semuenzaniso, kune 100-mita yeCategory 5e network tambo, iyo yakaenzana impedance yeIEEE802.3at inofanira kunge iri pasi pe12.5 ohms, uye iyo yeIEEE802.3af inofanira kunge iri pasi pe20 ohms.Zvinogona kuoneka kuti idiki iyo yakaenzana impedance iri, kure kure kureba kwekufambisa kuri.

2. PoE mwero
Kuti uve nechokwadi chekufambisa chinhambwe chePoE switch, zvinoenderana nekubuda kwevoltage yePoE magetsi.Inofanira kunge yakakwira sezvinobvira mukati meyero (44-57VDC).Iyo inobuda voltage yePoE switch port inofanirwa kuenderana neIEEE802.3af/pamwero.

Njodzi dzakavanzwa dzeasiri-standard POE switch
Isiri-yakajairwa PoE magetsi inoenderana neyakajairwa PoE magetsi ekupa.Iyo haina PoE control chip mukati, uye hapana nhanho yekuona.Ichapa simba kune IP terminal zvisinei nekuti inotsigira PoE.Kana iyo IP terminal isina PoE magetsi ekupa, ingangoita Pisa pasi network chiteshi.

1. Sarudza zvishoma "zvisiri-standard" PoE
Paunosarudza PoE switch, edza kusarudza yakajairwa, ine zvinotevera zvakanakira:
Iyo magetsi ekupedzisira (PSE) uye iyo yekugamuchira simba yekupedzisira (PD) inogona dynamically kunzwa uye kugadzirisa magetsi ekupa.
Dzivirira zvinobudirira magumo ekugamuchira (kazhinji IPC) kubva pakupiswa nemagetsi kuvhunduka (zvimwe zvinhu zvinosanganisira pfupi dunhu, surge kudzivirira, nezvimwewo).
Inogona kuona nehungwaru kana iyo terminal inotsigira PoE, uye haizopi simba kana ichibatanidza kune isiri-PoE terminal.

Kwete-standard PoE switcheskazhinji havana matanho ekuchengetedza ari pamusoro apa kuitira kuchengetedza mari, saka kune dzimwe njodzi dzekuchengetedza.Nekudaro, hazvireve kuti isiri-yakajairika PoE haigone kushandiswa.Kana iyo voltage yeasina-standard PoE ichienderana nevoltage yechishandiso chine simba, inogona zvakare kushandiswa uye inogona kuderedza mitengo.

2. Usashandise “fake” PoE.Fake PoE zvishandiso zvinongosanganisa simba reDC mune network tambo kuburikidza nePoE musanganiswa.Iwo haagone kupihwa simba neyakajairwa PoE switch, zvikasadaro mudziyo uchapera, saka usashandise fake PoE zvishandiso.Mumashandisirwo einjiniya, hazvingodikanwa chete kusarudza yakajairwa PoE switch, asiwo yakajairwa PoE zviteshi.

Nezve dambudziko rekudonha rekuchinja
Huwandu hwematanho eiyo cascaded switches inosanganisira kuverenga kwebandwidth, muenzaniso wakapfava:
Kana shanduko ine 100Mbps network port inokandwa kusvika pakati, iyo inoshanda bandwidth ndeye 45Mbps (bandwidth utilization ≈ 45%).Kana imwe neimwe switch yakabatana kune yekutarisisa mudziyo ine yakazara bit rate ye15M, iyo inoverengera 15M yebandwidth yeimwe switch, ipapo 45/15≈3, 3 switch inogona cascaded.
Sei kushandiswa kwebandwidth kunenge kuenzana ne45%?Iyo chaiyo Ethernet IP packet header account inosvika makumi maviri neshanu muzana yehuwandu hwetraffic, iyo chaiyo iripo yekubatanidza bandwidth ndeye 75%, uye iyo yakachengetwa bandwidth inoonekwa se30% mune inoshanda maapplication, saka bandwidth chiyero chekushandisa inofungidzirwa kuva 45% .

About switch port identification
1. Kupinda uye uplink ports
Shandura zviteshi zvakakamurwa kuita yekuwana uye uplink ports kusiyanisa zvirinani masevhisi uye kurerutsa kugadzirisa, nekudaro kudoma akasiyana echiteshi.
Kupinda pachiteshi: Sezvinoreva zita, ndiyo interface yakabatana zvakananga kune terminal (IPC, isina waya AP, PC, nezvimwewo)
Uplink port: Chiteshi chakabatana kune aggregation kana core network, kazhinji ine yepamusoro interface rate, haitsigire basa rePoE.