Kodi kusintha kwa PoE kumapereka bwanji mphamvu ya PoE

Kodi kusintha kwa PoE kumapereka bwanji mphamvu ya PoE? PoE Power Supply Code mwachidule

Mfundo yamagetsi ya PoE ndiyosavuta kwambiri. Zotsatirazi zimatengera kusintha kwa PoE monga chitsanzo kuti afotokoze mwatsatanetsatane mfundo yogwira ntchito ya kusintha kwa PoE, njira yoperekera mphamvu ya PoE ndi mtunda wotumizira.

Momwe PoE Swichi Amagwirira Ntchito

Mukalumikiza chipangizo cholandirira mphamvu ku switch ya PoE, kusintha kwa PoE kudzagwira ntchito motere:

Khwerero 1: Dziwani chida choyendetsedwa (PD). Cholinga chachikulu ndikuwona ngati chipangizo cholumikizidwa ndi chipangizo chenicheni (PD) (kwenikweni, ndicho kuzindikira chipangizo chomwe chingathe kuthandizira mphamvu pa Ethernet standard). Kusintha kwa PoE kudzatulutsa voteji yaing'ono padoko kuti izindikire chipangizo chomaliza cholandira mphamvu, chomwe chimatchedwa kuti voltage pulse discovery. Ngati kukana kogwira mtima kwa mtengo wotchulidwawo kwazindikirika, chipangizo cholumikizidwa ku doko ndicho chipangizo chenicheni cholandirira mphamvu. Tiyenera kuzindikira kuti kusintha kwa PoE ndikusintha kwa PoE, ndipo kusintha kwa PoE kosasinthika kwa single-chip solution sikungawonetse izi popanda chipangizo chowongolera.

Khwerero 2: Gulu la Zida Zamagetsi (PD). Chida Chamagetsi (PD) chikazindikirika, chosinthira cha PoE chimachiyika m'magulu, chimachiyika m'magulu, ndikuwunika kugwiritsa ntchito mphamvu komwe PD imafunikira.

Gawo 3: Yambitsani magetsi. Mulingo ukatsimikiziridwa, chosinthira cha PoE chidzapereka mphamvu ku chipangizo cholandirira kuchokera pamagetsi otsika mpaka mphamvu ya 48V DC itaperekedwa mkati mwa nthawi yosakwana 15μs.

Gawo 4: Yatsani nthawi zonse. Imapereka mphamvu zokhazikika komanso zodalirika za 48V DC pazida zolandirira kuti zigwirizane ndi kugwiritsa ntchito mphamvu kwa zida zolandirira.

Gawo 5: Lumikizani magetsi. Chida cholandirira mphamvu chikalumikizidwa, kugwiritsa ntchito mphamvu kumachulukirachulukira, kuzungulira kwachidule kumachitika, ndipo mphamvu yonse yogwiritsira ntchito mphamvu imapitilira bajeti yamagetsi a PoE switch, kusintha kwa PoE kuyimitsa kupereka mphamvu ku chipangizo cholandirira mphamvu mkati mwa 300-400ms, ndikuyambitsanso magetsi. mayeso. Ikhoza kuteteza bwino chipangizo cholandirira mphamvu ndi kusintha kwa PoE kuteteza kuwonongeka kwa chipangizocho.

PoE power supply mode

Zitha kuwoneka kuchokera pamwambapa kuti mphamvu ya PoE imazindikiridwa kudzera pa chingwe cha netiweki, ndipo chingwe cha netiweki chimapangidwa ndi mapeyala anayi opotoka (8 mawaya apakati). Chifukwa chake, mawaya asanu ndi atatu oyambira mu chingwe cha netiweki ndi ma switch a PoE omwe amapereka deta ndi Sing'anga yotumizira mphamvu. Pakadali pano, chosinthira cha PoE chipereka chida cholandirira chomwe chili ndi mphamvu yofananira ya DC kudzera mumitundu itatu yamagetsi ya PoE: Mode A (End-Span), Mode B (Mid-Span) ndi 4-pair.

Kutalika kwa magetsi a PoE

Chifukwa kufala kwa mphamvu ndi maukonde zizindikiro pa chingwe maukonde mosavuta anakhudzidwa kukana ndi capacitance, chifukwa chizindikiro attenuation kapena kusakhazikika magetsi, kufala mtunda wa chingwe maukonde ndi ochepa, ndi pazipita kufala mtunda akhoza kufika mamita 100 okha. Mphamvu ya PoE imazindikiridwa kudzera pa chingwe cha netiweki, kotero kuti mtunda wake wotumizira umakhudzidwa ndi chingwe cha netiweki, ndipo mtunda wotalikirapo kwambiri ndi 100 metres. Komabe, ngati PoE extender igwiritsidwa ntchito, gawo lamagetsi la PoE litha kupitilira mpaka 1219 metres.

Momwe mungathetsere kulephera kwamphamvu kwa PoE?

Mphamvu ya PoE ikalephera, mutha kuthana ndi zinthu zinayi zotsatirazi.

Onani ngati chipangizo cholandirira magetsi chimathandizira magetsi a PoE. Chifukwa si zida zonse zapaintaneti zomwe zitha kuthandizira ukadaulo wamagetsi a PoE, ndikofunikiranso kuyang'ana ngati chipangizocho chimathandizira ukadaulo wamagetsi a PoE musanalumikize chipangizocho ku switch ya PoE. Ngakhale PoE idzazindikira ikagwira ntchito, imatha kuzindikira ndikupereka mphamvu ku chipangizo cholandirira chomwe chimathandizira ukadaulo wamagetsi wa PoE. Ngati chosinthira cha PoE sichipereka mphamvu, zitha kukhala chifukwa cholandila sichingathandizire ukadaulo wamagetsi a PoE.

Chongani ngati mphamvu ya chipangizo cholandirira mphamvu ikuposa mphamvu yayikulu ya posinthira. Mwachitsanzo, chosinthira cha PoE chomwe chimangothandizira muyezo wa IEEE 802.3af (mphamvu yayikulu ya doko lililonse pa switch ndi 15.4W) imalumikizidwa ndi chipangizo cholandirira mphamvu ndi mphamvu ya 16W kapena kupitilira apo. Panthawiyi, mphamvu yolandira mphamvu Chipangizocho chikhoza kuwonongeka chifukwa cha kulephera kwa mphamvu kapena mphamvu yosakhazikika, zomwe zimapangitsa kuti PoE awonongeke.

Onani ngati mphamvu yonse ya zida zonse zolumikizidwa imaposa bajeti yamagetsi ya switch. Mphamvu yonse ya zida zolumikizidwa ikadutsa bajeti yosinthira mphamvu, mphamvu ya PoE imalephera. Mwachitsanzo, 24-port PoE switch ndi bajeti ya mphamvu ya 370W, ngati kusinthako kukugwirizana ndi IEEE 802.3af muyezo, kungathe kulumikiza zipangizo 24 zolandira mphamvu zomwe zimatsatira muyezo womwewo (chifukwa mphamvu ya chipangizo ichi ndi 15.4 W, kulumikiza 24 Mphamvu yonse ya chipangizocho imafika ku 369.6W, yomwe siidzapitirira bajeti ya mphamvu ya kusintha; ngati kusinthaku kumagwirizana ndi IEEE802.3at muyezo, zida 12 zokha zolandirira mphamvu zomwe zimatsata muyezo womwewo zimatha kulumikizidwa (chifukwa mphamvu yamtunduwu ndi 30W, ngati kusinthaku kulumikizidwa 24 kungadutse bajeti yamagetsi, kotero opitilira 12 okha angalumikizidwe).

Onani ngati njira yamagetsi yamagetsi (PSE) ikugwirizana ndi zida zolandirira mphamvu (PD). Mwachitsanzo, chosinthira cha PoE chimagwiritsa ntchito njira A popereka mphamvu, koma cholumikizira cholumikizira magetsi chimangolandira kufalikira kwamagetsi munjira B, chifukwa chake sichikhoza kupereka mphamvu.

Fotokozerani mwachidule

Tekinoloje yamagetsi ya PoE yakhala gawo lofunikira pakusintha kwa digito. Kumvetsetsa mfundo yamagetsi a PoE kudzakuthandizani kuteteza ma switch a PoE ndi zida zolandirira magetsi. Nthawi yomweyo, kumvetsetsa zovuta zolumikizirana ndi PoE switch ndi mayankho zitha kupewa kutumizira ma network a PoE. kuwononga nthawi ndi ndalama zosafunikira.