Malunga nonikezelo lwamandla umgama weIiswitshi zePOE
Umgama wokunikezelwa kwamandla e-PoE unqunywe ngumqondiso wedatha kunye nomgama wokudlulisa, kwaye umgama wokuhambisa umqondiso wedatha unqunywe yintambo yenethiwekhi.

1. Iimfuno zentambo yenethiwekhi Ukunciphisa i-impedance ye-network cable, ixesha elide lokuhambisa umgama, ngoko okokuqala, umgangatho wentambo yenethiwekhi kufuneka uqinisekiswe, kwaye umgangatho wentambo yenethiwekhi kufuneka uthengwe.Kucetyiswa ukuba usebenzise i-super-category 5 network cable.Umgama wothumelo lweempawu zedatha ye-cable eqhelekileyo yecandelo le-5 malunga neemitha ezili-100.
Ekubeni kukho imigangatho emibini ye-PoE: i-IEEE802.af kunye ne-IEEE802.3at imigangatho, zineemfuno ezahlukeneyo kwiintambo zenethiwekhi ze-Cat5e, kwaye umahluko ubonakaliswa ngokukodwa kwi-impedance efanayo.Umzekelo, kwi-100-metres ye-network cable ye-100 yeemitha, i-impedance elinganayo ye-IEEE802.3at kufuneka ibe ngaphantsi kwe-12.5 ohms, kwaye leyo ye-IEEE802.3af kufuneka ibe ngaphantsi kwe-20 ohms.Inokubonwa ukuba incinci i-impedance elinganayo, umgama wothumelo ungaphezulu.

2. Umgangatho wePoE
Ukuqinisekisa umgama wothumelo lwe-PoE switch, kuxhomekeke kumbane wokuphuma kombane we-PoE.Kufuneka ibe phezulu kangangoko kunokwenzeka ngaphakathi komgangatho (44-57VDC).Umbane wemveliso ye-PoE switch port kufuneka ihambelane ne-IEEE802.3af/kwimigangatho.

Iingozi ezifihliweyo zokutshintsha okungeyomgangatho we-POE
Ubonelelo lwamandla lwe-PoE olungekho mgangathweni lunxulumene nonikezelo lombane oluqhelekileyo lwe-PoE.Ayinayo i-chip yokulawula ye-PoE ngaphakathi, kwaye akukho nyathelo lokufumanisa.Iza kunika amandla kwi-terminal ye-IP kungakhathaliseki ukuba ixhasa i-PoE.Ukuba i-terminal ye-IP ayinalo unikezelo lwamandla lwe-PoE, kunokwenzeka ukuba Tshisa izibuko lenethiwekhi.

1. Khetha iPoE encinci “engeyo-standard”
Xa ukhetha utshintsho lwe-PoE, zama ukukhetha umgangatho, onezi nzuzo zilandelayo:
Ukuphela konikezelo lwamandla (PSE) kunye nesiphelo sokufumana amandla (PD) sinokuziva ngokuguquguqukayo kunye nokulungelelanisa umbane wokubonelela.
Ukukhusela ngokufanelekileyo ukuphela kokufumana (ngokuqhelekileyo i-IPC) ekutshisweni kukutshitshiswa kombane (ezinye iinkalo ziquka isiphaluka esifutshane, ukukhuselwa kokunyuka, njl.).
Iyakwazi ukubona ngobulumko ukuba i-terminal iyayixhasa i-PoE, kwaye ayiyi kunika amandla xa idibanisa kwi-terminal engeyiyo ye-PoE.

Ayi-iiswitshi ezisemgangathweni zePoEngokuqhelekileyo abanawo la manyathelo okhuseleko angasentla ukuze kugcinwe iindleko, ngoko kukho imingcipheko ethile yokhuseleko.Nangona kunjalo, oko akuthethi ukuba i-PoE engekho mgangathweni ayinakusetyenziswa.Xa i-voltage ye-PoE engeyiyo i-standard ihambelana ne-voltage yesixhobo esinamandla, ingasetyenziselwa kwaye inokunciphisa iindleko.

2. Musa ukusebenzisa iPoE “yomgunyathi”.Izixhobo zePoE zobuxoki zidibanisa kuphela amandla eDC kwintambo yothungelwano ngomdibanisi wePoE.Abanakunikwa amandla ngokutshintsha okuqhelekileyo kwe-PoE, ngaphandle koko isixhobo siya kutshisa, ngoko ungasebenzisi izixhobo ze-PoE zobuxoki.Kwizicelo zobunjineli, akuyimfuneko kuphela ukukhetha ukutshintshwa kwe-PoE eqhelekileyo, kodwa kunye neeterminals ze-PoE eziqhelekileyo.

Malunga nengxaki ye-cascading yokutshintsha
Inani leeleya zokutshintsha okutshintshileyo kubandakanya ukubalwa kwe-bandwidth, umzekelo olula:
Ukuba i-switch ene-100Mbps network port i-cascade ukuya kwiziko, i-bandwidth esebenzayo yi-45Mbps (ukusetyenziswa kwe-bandwidth ≈ 45%).Ukuba utshintsho ngalunye luqhagamshelwe kwisixhobo sokubeka iliso kunye nesantya se-bit esipheleleyo se-15M, esenza i-15M ye-bandwidth ye-switch eyodwa, emva koko i-45 / 15≈3, i-3 itshintshela i-cascade.
Kutheni ukusetyenziswa kwe-bandwidth kuphantse kulingana nama-45%?I-Ethernet IP ye-packet ye-header ye-header yangempela malunga ne-25% ye-traffic iyonke, eyona nto ikhoyo i-bandwidth yekhonkco yi-75%, kwaye i-bandwidth egciniweyo ithathwa njenge-30% kwizicelo eziphathekayo, ngoko izinga lokusetyenziswa kwe-bandwidth liqikelelwa ukuba liyi-45% .

Malunga nokuchongwa kwezibuko lokutshintsha
1. Ukufikelela kunye ne-uplink port
Amazibuko okutshintsha ahlulahlulwe abe ngamazibuko okufikelela kunye ne-uplink ukwahlula ngcono iinkonzo nokwenza lula ulondolozo, ngaloo ndlela kuchazwa iindima zezibuko ezahlukeneyo.
Izibuko lokufikelela: Njengoko igama lisitsho, lujongano oluqhagamshelwe ngokuthe ngqo kwi-terminal (IPC, i-wireless AP, iPC, njl.njl.)
I-Uplink port: I-port exhunywe kwi-aggregation okanye i-core network, ngokuqhelekileyo kunye nesantya esiphezulu sojongano, ayixhasi umsebenzi we-PoE.