1. Iingqwalasela eziphambili zokukhetha utshintsho lwe-PoE
1. Khetha iswitshi eqhelekileyo yePoE
Kwikholamu yangaphambili ye-PoE, sikhankanye ukuba umbane oqhelekileyo we-PoE wokutshintsha umbane unokubona ngokuzenzekelayo ukuba i-terminal kwinethiwekhi sisixhobo sePD esixhasa umbane we-PoE.
Imveliso ye-PoE engeyiyo eyomgangatho luhlobo lonikezelo lwamandla olomeleleyo lwenethiwekhi yesixhobo sonikezelo lwamandla ombane, olubonelela ngamandla ngokukhawuleza lwakuba lulayitiwe.Ke ngoko, qala uqiniseke ukuba iswitshi oyithengayo sisitshixo esiqhelekileyo se-PoE, ukuze ungatshisi ikhamera yangaphambili.
2. Amandla ezixhobo
Khetha iswitsha yePoE ngokwamandla esixhobo.Ukuba amandla ekhamera yakho yokujonga ingaphantsi kwe-15W, unokukhetha i-PoE switch exhasa umgangatho we-802.3af;ukuba amandla esixhobo sikhulu kune-15W, ngoko kufuneka ukhethe utshintsho lwe-PoE lomgangatho we-802.3;ukuba amandla ekhamera adlula i-60W, kufuneka ukhethe i-802.3 BT ye-switch standard high-power switch, ngaphandle koko amandla ayanele, kwaye izixhobo zangaphambili azikwazi ukuziswa.
3. Inani lamazibuko
Okwangoku, kukho ubukhulu becala 8, 12, 16, kunye namachweba angama-24 kwiPoE switch kwimarike.Indlela yokukhetha kuxhomekeke kwinani kunye namandla eekhamera eziqhagamshelwe ngaphambili ukubala inani elipheleleyo lamandla.Inani lamazibuko anamandla ahlukeneyo anokwabelwa kwaye adityaniswe ngokuhambelana nonikezelo lwamandla lulonke lokutshintsha, kwaye i-10% yamachweba womnatha agcinwe.Qaphela ukuba ukhethe isixhobo se-PoE esinamandla aphumayo angaphezu kwamandla ewonke esixhobo.
Ukongeza kokuhlangabezana neemfuno zamandla, izibuko kufuneka kwakhona lihlangabezane nomgama wonxibelelwano, ngakumbi umgama omde kakhulu (ofana neemitha ezingaphezu kwe-100).Kwaye inemisebenzi yokukhusela umbane, ukhuseleko lwe-electrostatic, anti-interference, ukhuseleko lokhuseleko lolwazi, ukuthintela ukusasazeka kwentsholongwane kunye nokuhlaselwa kwenethiwekhi.
Ukukhethwa kunye nokucwangciswa kweeswitshi ze-PoE
I-PoE itshintsha ngamanani ahlukeneyo amazibuko
4. I-bandwidth yePort
I-bandwidth yePort yisalathisi esisisiseko sobuchwephesha sokutshintsha, esibonisa ukusebenza koqhagamshelo lwenethiwekhi yokutshintsha.Ukutshintsha ikakhulu kunama-bandwidth alandelayo: 10Mbit / s, 100Mbit / s, 1000Mbit / s, 10Gbit / s, njl. Xa ukhetha i-PoE switch, kuyimfuneko ukuba uqale uqikelele ukuhamba kwetrafikhi yeekhamera ezininzi.Xa ubala, kufuneka kubekho umda.Ngokomzekelo, ukutshintshwa kwe-1000M akukwazi ukuqikelelwa ngokupheleleyo.Ngokuqhelekileyo, izinga lokusetyenziswa li malunga ne-60%, malunga ne-600M..
Jonga umlambo omnye ngokwekhamera yenethiwekhi oyisebenzisayo, uze uqikelele ukuba zingaphi iikhamera ezinokuqhagamshelwa kwisitshixo.
Umzekelo, umjelo wekhowudi enye ye-1.3 yezigidi-pixel 960P ikhamera idla ngokuba yi-4M,
Ukuba usebenzisa utshintsho lwe-100M, unokudibanisa iiseti ze-15 (15 × 4 = 60M);
Ngokutshintsha kweGigabit, iiyunithi ze-150 (150 × 4 = 600M) zinokudibaniswa.
Ikhamera ye-2-megapixel 1080P idla ngokuba nomlambo omnye we-8M.
Ngokutshintsha kwe-100M, unokudibanisa iiseti ezi-7 (7 × 8 = 56M);
Ngokutshintsha kwegigabit, iiseti ezingama-75 (75 × 8 = 600M) zinokudityaniswa.
5. I-bandwidth yomqolo
I-backplane bandwidth ibhekisa kubuninzi bedatha enokuthi iphathwe phakathi kweprosesa yojongano lotshintshiselwano okanye ikhadi lojongano kunye nebhasi yedatha.
I-backplane bandwidth imisela amandla okucubungula idatha yokutshintsha.Ukuphakama kwe-backplane ye-backplane, amandla anamandla okucubungula idatha kunye nesantya sotshintshiselwano lwedatha ngokukhawuleza;kungenjalo, isantya utshintshiselwano data sicotha.I-formula yokubala ye-backplane bandwidth yile ilandelayo: I-Bandplane bandwidth = inani lamazibuko × izinga le-port × 2.
Umzekelo wokubala: Ukuba iswitshi inamazibuko angama-24, kwaye isantya sezibuko ngalinye yigigabhithi, ngoko i-backplane bandwidth=24*1000*2/1000=48Gbps.
6. Ireyithi yokuthumela ipakethi
Idatha kwinethiwekhi iqulunqwe ngamapakethi edatha, kwaye ukuqhutyelwa kwepakethi nganye yedatha kudla izibonelelo.Ireyithi yokuthumela (ekwabizwa ngokuba yi-throughput) ibhekisa kwinani leepakethi zedatha ezidlula kwiyunithi nganye yexesha ngaphandle kokulahleka kwepakethi.Ukuba i-throughput incinci kakhulu, iya kuba yi-bottleneck yenethiwekhi kwaye ichaphazele kakubi ukuhanjiswa kwenethiwekhi yonke.
Ifomyula yezinga lokuthunyelwa kwepakethi yile ilandelayo: I-Inputput (Mpps) = Inani le-10 izibuko ze-Gigabit × 14.88 Mpps + Inani lamazibuko e-Gigabit × 1.488 Mpps + Inani le-100 yezibuko ze-Gigabit × 0.1488 Mpps.
Ukuba i-throughput ebaliweyo ingaphantsi kwe-throughput yokutshintsha, ukutshintshela i-wire-speed switching kunokufezekiswa, oko kukuthi, izinga lokutshintsha lifikelela kwisantya sothumelo lwedatha kumgca wothumelo, ngaloo ndlela kuphelisa ibhodlela yokutshintsha ukuya kwinqanaba elikhulu.
Ixesha lokuposa: Jun-09-2022