Shamwari dzakawanda dzakadzokorora kubvunza kana magetsi ePoE akagadzikana? Ndeipi tambo yakanakira PoE magetsi ekupa? Nei kamera ichiri kusaratidza kana ichifambiswa nePoE switch? Uye zvichingodaro, izvi zvine hukama nekurasikirwa kwemagetsi kwePOE magetsi, ayo anoregeredzwa nyore mumapurojekiti.
1, Chii chinonzi POE magetsi ekupa
PoE inoreva tekinoroji yekupa magetsi eDC kune mamwe maIP-based terminals (senge IP mafoni, wireless local area network access point APs, network camera, etc.) pasina kugadziridzwa kune iripo Ethernet Cat. 5 cabling zvivakwa.
PoE tekinoroji inogona kuvimbisa kuchengetedzeka kweiyo iripo yakarongeka cabling uku ichiona kushanda kwakajairwa kwemanetwork aripo, kuderedza mutengo.
Iyo yakakwana PoE system inosanganisira zvikamu zviviri: magetsi ekupedzisira mudziyo uye yekugamuchira yekupedzisira mudziyo.
Power Supply Equipment (PSE): Ethernet switch, marouters, hubs, kana mamwe madhizaini ekuchinjisa anotsigira POE kushanda.
Simba rekugamuchira mudziyo (PD): Muchirongwa chekutarisa, inonyanya kuve network kamera (IPC).
2, POE simba rekupa mwero
Iyo yazvino chiyero chepasi rose IEEE802.3bt ine zviviri zvinodiwa:
Rudzi rwekutanga: Chimwe chazvo chinoda kuti PSE iwane simba rekubuda kwe60W, ine simba rinosvika pamudziyo wekugamuchira we51W (sezvinoratidzwa mutafura iri pamusoro, iyi ndiyo data yakaderera), uye kurasikirwa kwesimba kwe9W.
Yechipiri nzira inoda kuti PSE iwane simba rinobuda re90W, rine simba re71W rinosvika kune chigadziro chekugamuchira uye kurasikirwa kwesimba kwe19W.
Kubva pane zvataurwa pamusoro apa, zvinogona kuonekwa kuti sezvo simba rinowedzera, kurasikirwa kwesimba hakusi kuenzana nemagetsi, asi kuwedzera. Saka kurasikirwa kwePSE kunogona kuverengerwa sei mukushandisa zvinoshanda?
3, POE simba rekupa kurasikirwa
Saka ngatitangei kutarisa kuti fizikisi yechikoro chepakati inoverenga sei kurasikirwa kwesimba rewaya.
Mutemo waJoule mutemo unotsanangura quantitatively kutendeuka kwesimba remagetsi mumagetsi ekupisa kuburikidza nekuita ikozvino.
Zviri mukati ndezvokuti: Kupisa kunoitwa neazvino ichipfuura nemu conductor kunoenderana nesimba re quadratic remazuva ano, kuramba kwe conductor, uye nguva yemagetsi. Ndiko kuti, kushandiswa kwevashandi kunogadzirwa panguva yekuverenga maitiro.
Mutemo weJoule's mathematical expression: Q = I ² Rt (inoshanda kune ese maseketi), uko Q ndiko kurasikirwa kwesimba P, ini ndiri iyezvino, R ndiko kuramba, uye t ndiyo nguva.
Mukushandisa kunoshanda, sePSE nePD kushanda panguva imwe chete, kurasikirwa kwakazvimirira pane nguva. Mhedziso ndeyokuti muPOE system, simba rekurasikirwa kwetambo yetiweki yakananga zvakananga kune simba re quadratic yezvino uye zvakananga kuenzana nehukuru hwekupikisa. Zvichitaurwa zviri nyore, kuti tideredze simba rekushandisa retiweki tambo, isu tinofanira kuedza kudzikisa ikozvino kwewaya uye kushorwa kwetambo network zvakanyanya sezvinobvira. Kukosha kwekudzikisa ikozvino kunonyanya kukosha.
Saka ngatitarisei kune chaiwo maparamita epasi rose zviyero:
Muchiyero cheIEEE802.3af, kushorwa kwetambo yetiweki ndeye 20 Ω, inodiwa PSE inobuda voltage ndeye 44V, ikozvino 0.35A, uye simba rekurasikirwa P = 0.35 * 0.35 * 20 = 2.45W.
Saizvozvo, muIEEE802.3at chiyero, kushorwa kwetambo network ndeye 12.5 Ω, iyo inodiwa voltage ndeye 50V, ikozvino iri 0.6A, uye kurasikirwa kwesimba P = 0.6 * 0.6 * 12.5 = 4.5W.
Iko hakuna dambudziko kushandisa iyi nzira yekuverenga kune ese maviri zviyero. Asi kana zvasvika kune IEEE802.3bt chiyero, haigone kuverengwa seizvi. Kana magetsi ari 50V uye simba rekusvika 60W rinoda kuva 1.2A ikozvino, ipapo simba rekurasikirwa ndiP = 1.2 * 1.2 * 12.5 = 18W. Kubvisa kurasikirwa, simba rekusvika kuPD mudziyo i42W chete.
4, Zvikonzero zvekurasikirwa kwesimba muPOE
Saka chikonzero chii chaizvo?
Icho chaicho chinodiwa che51W chinoderedzwa ne9W yemagetsi emagetsi. Saka chii chaizvo chakonzera kukanganisa kwekuverenga.
Power Supply Equipment (PSE): Ethernet switch, marouters, hubs, kana mamwe madhizaini ekuchinjisa anotsigira POE kushanda.
Simba rekugamuchira mudziyo (PD): Muchirongwa chekutarisa, inonyanya kuve network kamera (IPC).
2, POE simba rekupa mwero
Iyo yazvino chiyero chepasi rose IEEE802.3bt ine zviviri zvinodiwa:
Rudzi rwekutanga: Chimwe chazvo chinoda kuti PSE iwane simba rekubuda kwe60W, ine simba rinosvika pamudziyo wekugamuchira we51W (sezvinoratidzwa mutafura iri pamusoro, iyi ndiyo data yakaderera), uye kurasikirwa kwesimba kwe9W.
Yechipiri nzira inoda kuti PSE iwane simba rinobuda re90W, rine simba re71W rinosvika kune chigadziro chekugamuchira uye kurasikirwa kwesimba kwe19W.
Kubva pane zvataurwa pamusoro apa, zvinogona kuonekwa kuti sezvo simba rinowedzera, kurasikirwa kwesimba hakusi kuenzana nemagetsi, asi kuwedzera. Saka kurasikirwa kwePSE kunogona kuverengerwa sei mukushandisa zvinoshanda?
3, POE simba rekupa kurasikirwa
Saka ngatitangei kutarisa kuti fizikisi yechikoro chepakati inoverenga sei kurasikirwa kwesimba rewaya.
Mutemo waJoule mutemo unotsanangura quantitatively kutendeuka kwesimba remagetsi mumagetsi ekupisa kuburikidza nekuita ikozvino.
Zviri mukati ndezvokuti: Kupisa kunoitwa neazvino ichipfuura nemu conductor kunoenderana nesimba re quadratic remazuva ano, kuramba kwe conductor, uye nguva yemagetsi. Ndiko kuti, kushandiswa kwevashandi kunogadzirwa panguva yekuverenga maitiro.
Mutemo weJoule's mathematical expression: Q = I ² Rt (inoshanda kune ese maseketi), uko Q ndiko kurasikirwa kwesimba P, ini ndiri iyezvino, R ndiko kuramba, uye t ndiyo nguva.
Mukushandisa kunoshanda, sePSE nePD kushanda panguva imwe chete, kurasikirwa kwakazvimirira pane nguva. Mhedziso ndeyokuti muPOE system, simba rekurasikirwa kwetambo yetiweki yakananga zvakananga kune simba re quadratic yezvino uye zvakananga kuenzana nehukuru hwekupikisa. Zvichitaurwa zviri nyore, kuti tideredze simba rekushandisa retiweki tambo, isu tinofanira kuedza kudzikisa ikozvino kwewaya uye kushorwa kwetambo network zvakanyanya sezvinobvira. Kukosha kwekudzikisa ikozvino kunonyanya kukosha.
Saka ngatitarisei kune chaiwo maparamita epasi rose zviyero:
Muchiyero cheIEEE802.3af, kushorwa kwetambo yetiweki ndeye 20 Ω, inodiwa PSE inobuda voltage ndeye 44V, ikozvino 0.35A, uye simba rekurasikirwa P = 0.35 * 0.35 * 20 = 2.45W.
Saizvozvo, muIEEE802.3at chiyero, kushorwa kwetambo network ndeye 12.5 Ω, iyo inodiwa voltage ndeye 50V, ikozvino iri 0.6A, uye kurasikirwa kwesimba P = 0.6 * 0.6 * 12.5 = 4.5W.
Iko hakuna dambudziko kushandisa iyi nzira yekuverenga kune ese maviri zviyero. Asi kana zvasvika kune IEEE802.3bt chiyero, haigone kuverengwa seizvi. Kana magetsi ari 50V uye simba rekusvika 60W rinoda kuva 1.2A ikozvino, ipapo simba rekurasikirwa ndiP = 1.2 * 1.2 * 12.5 = 18W. Kubvisa kurasikirwa, simba rekusvika kuPD mudziyo i42W chete.
4, Zvikonzero zvekurasikirwa kwesimba muPOE
Saka chikonzero chii chaizvo?
Icho chaicho chinodiwa che51W chinoderedzwa ne9W yemagetsi emagetsi. Saka chii chaizvo chakonzera kukanganisa kwekuverenga.
Zvinogona kuoneka kuti zvirinani tambo, diki diki kuramba, zvinoenderana neformula Q = I ² Rt, zvinoreva kuti kurasikirwa kwemagetsi panguva yekugadzira magetsi ndiko kushoma, saka ndosaka zvichidikanwa kushandisa tambo. zvakanaka. Inokurudzirwa kushandisa Category 6 tambo seyakachengeteka sarudzo.
Sezvatataura pamusoro, iyo yekurasikirwa kwesimba fomula, Q=I ² Rt, kuti kuderedze kurasikirwa pakati pePSE magetsi emagetsi terminal uye PD yekugamuchira michina, iyo shoma iripo uye kuramba inodiwa kuti iwane kuita kwakanyanya musimba rose. hurongwa hwekugovera.
Tevera CF FIBERLINK kuti udzidze zvakawanda nezve ruzivo rwekuchengetedza !!! Global Service Hotline: 86752-2586485
Nguva yekutumira: May-30-2023