1. Mfundo zazikuluzikulu za kusankha kosintha kwa PoE
1. Sankhani chosinthira cha PoE chokhazikika
M'gawo la PoE lapitalo, tidanena kuti chosinthira chamagetsi cha PoE chimatha kudziwa ngati cholumikizira pa netiweki ndi chipangizo cha PD chomwe chimathandizira magetsi a PoE.
Chogulitsa chosavomerezeka cha PoE ndi chida champhamvu chamagetsi chamtundu wa network cable power supply, chomwe chimapereka mphamvu chikangoyatsidwa.Chifukwa chake, choyamba onetsetsani kuti chosinthira chomwe mumagula ndi chosinthira cha PoE, kuti musawotche kamera yakutsogolo.
2. Mphamvu zamagetsi
Sankhani chosinthira cha PoE malinga ndi mphamvu ya chipangizocho.Ngati mphamvu ya kamera yanu yowunikira ili yochepera 15W, mutha kusankha chosinthira cha PoE chomwe chimathandizira muyezo wa 802.3af;ngati mphamvu ya chipangizocho ndi yaikulu kuposa 15W, ndiye kuti muyenera kusankha kusintha kwa PoE kwa 802.3at;ngati mphamvu ya kamera iposa 60W, muyenera kusankha 802.3 BT yosinthika yamphamvu kwambiri, apo ayi mphamvuyo sikwanira, ndipo zida zam'tsogolo sizingabweretsedwe.
3. Chiwerengero cha madoko
Pakadali pano, pali madoko 8, 12, 16, ndi 24 pa switch ya PoE pamsika.Momwe mungasankhire zimatengera kuchuluka ndi mphamvu zamakamera olumikizidwa kutsogolo kuwerengera kuchuluka kwa mphamvu.Chiwerengero cha madoko omwe ali ndi mphamvu zosiyanasiyana amatha kugawidwa ndikuphatikizidwa molingana ndi mphamvu zonse zosinthira, ndipo 10% ya madoko a netiweki amasungidwa.Samalani kusankha chipangizo cha PoE chomwe mphamvu zake zotulutsa zimakhala zazikulu kuposa mphamvu zonse za chipangizocho.
Kuphatikiza pakukwaniritsa zofunikira zamagetsi, doko liyeneranso kukwaniritsa mtunda wolumikizana, makamaka mtunda wautali kwambiri (monga wopitilira 100 metres).Ndipo ili ndi ntchito zoteteza mphezi, chitetezo cha electrostatic, anti-interference, chitetezo chazidziwitso, kupewa kufalikira kwa ma virus ndi kuwukira kwa maukonde.
Kusankhidwa ndi kasinthidwe ka ma switch a PoE
PoE imasintha ndi ma doko osiyanasiyana
4. Port bandwidth
Port bandwidth ndiye chizindikiro choyambirira chaukadaulo chosinthira, kuwonetsa momwe ma network amagwirira ntchito.Kusintha makamaka kumakhala ndi ma bandwidths otsatirawa: 10Mbit / s, 100Mbit / s, 1000Mbit / s, 10Gbit / s, etc. Posankha kusintha kwa PoE, m'pofunika kuti muyambe kulingalira za kayendedwe ka makamera angapo.Powerengera, payenera kukhala malire.Mwachitsanzo, kusintha kwa 1000M sikungaganizidwe mokwanira.Nthawi zambiri, kuchuluka kwa magwiritsidwe ndi pafupifupi 60%, komwe kuli pafupifupi 600M..
Yang'anani pamtsinje umodzi molingana ndi kamera ya netiweki yomwe mumagwiritsa ntchito, ndiyeno muyerekeze makamera angati omwe angalumikizidwe ndi switch.
Mwachitsanzo, makina amodzi a kamera ya 960P ya 1.3 miliyoni nthawi zambiri amakhala 4M,
Ngati mugwiritsa ntchito kusintha kwa 100M, mutha kulumikiza ma seti 15 (15 × 4 = 60M);
Ndi kusintha kwa Gigabit, mayunitsi 150 (150 × 4 = 600M) akhoza kulumikizidwa.
Kamera ya 2-megapixel 1080P nthawi zambiri imakhala ndi mtsinje umodzi wa 8M.
Ndi 100M lophimba, mukhoza kulumikiza 7 akanema (7 × 8 = 56M);
Ndi gigabit switch, 75 seti (75 × 8 = 600M) akhoza kulumikizidwa.
5. Backplane bandwidth
Backplane bandwidth imatanthawuza kuchuluka kwa deta yomwe imatha kuyendetsedwa pakati pa purosesa yosinthira mawonekedwe kapena khadi yolumikizira ndi basi ya data.
Bandiwidth yakumbuyo imatsimikizira kuthekera kwakusintha kwa data.Kukwera kwa bandiwifi ya backplane, kumapangitsanso mphamvu yokonza deta komanso kuthamanga kwachangu;apo ayi, ndi pang'onopang'ono kusinthana deta liwiro.Njira yowerengera ya bandwidth ya backplane ili motere: Backplane bandwidth = kuchuluka kwa madoko × kuchuluka kwa doko × 2.
Chitsanzo chowerengera: Ngati switch ili ndi madoko 24, ndipo liwiro la doko lililonse ndi gigabit, ndiye bandwidth yakumbuyo = 24*1000*2/1000=48Gbps.
6. Kutumiza kwa paketi
Deta mu netiweki imapangidwa ndi mapaketi a data, ndipo kukonza kwa paketi iliyonse ya data kumawononga zinthu.Mtengo wotumizira (wotchedwanso throughput) umatanthawuza kuchuluka kwa mapaketi a data omwe amadutsa pagawo la nthawi popanda kutayika kwa paketi.Ngati zotulutsazo ndizochepa kwambiri, zimakhala zolepheretsa maukonde ndikusokoneza kufalikira kwa netiweki yonse.
Fomula ya mlingo wotumizira paketi ili motere: Kudutsa (Mpps) = Chiwerengero cha madoko 10 a Gigabit × 14.88 Mpps + Nambala ya madoko a Gigabit × 1.488 Mpps + Nambala ya madoko 100 a Gigabit × 0.1488 Mpps.
Ngati mawerengedwe owerengeka ndi ocheperapo kusiyana ndi kusintha kwa kusintha, kusintha kwa waya-liwiro kungatheke, ndiko kuti, kusinthasintha kumafika pa liwiro la kutumiza deta pa mzere wotumizira, potero kuchotsa botolo la kusintha kwakukulu.
Nthawi yotumiza: Jun-09-2022