nkhani

Mu zida za Efaneti, pomwe PHY chip chilumikizidwa ndi RJ45, chosinthira maukonde nthawi zambiri chimawonjezeredwa.Ena network transformer center tap grounding.Zina zimalumikizidwa ndi magetsi, ndipo mtengo wamagetsi ukhoza kukhala wosiyana, 3.3V, 2.5V, 1.8V.Momwe mungalumikizire kampopi wapakatikati wa thiransifoma (PHY end)?

A. Chifukwa chiyani matepi ena apakati amalumikizidwa ndi magetsi?Ena maziko?

Izi makamaka zimatsimikiziridwa ndi mtundu wa driver wa UTP wa phy chip.Mtundu woyendetsa umagawidwa m'magalimoto oyendetsa magetsi ndi kuyendetsa panopa.Poyendetsa ndi voteji, imalumikizidwa ndi magetsi;poyendetsa ndi panopa, imagwirizanitsidwa ndi capacitor pansi.Chifukwa chake, njira yolumikizira yapampopi yapakati imagwirizana kwambiri ndi mtundu wa phy chip woyendetsa doko la UTP, komanso tsatanetsatane ndi kapangidwe ka chip.

Zindikirani: ngati kampopi wapakati alumikizidwa molakwika, doko la netiweki lidzakhala losakhazikika kapena lotsekedwa.

B. Chifukwa chiyani ma voltages osiyanasiyana amalumikizidwa ndi magetsi?

Izi zimatsimikiziridwa ndi mulingo wa doko la UTP wotchulidwa mu data ya PHY chip yomwe imagwiritsidwa ntchito.Mlingo uyenera kulumikizidwa ndi voteji lolingana, ndiye kuti, ngati 1.8V, kukoka mpaka 1.8V, ngati 3.3V, kukoka mpaka 3.3V.

Kukhudza kwapakati:

1. Popereka njira yobwereza yochepetsera ya phokoso lamtundu wamba pamzere wosiyana, njira yodziwika bwino yamakono ndi yodziwika bwino pa chingwe imachepetsedwa;

2. Perekani voteji ya DC bias kapena gwero lamagetsi kwa ma transceivers ena.

The Integrated RJ45 wamba mode kupondereza akhoza kuchita bwino, ndipo chikoka cha parasitic magawo ndi ochepa;Choncho, ngakhale mtengo ndi wokwera kwambiri, umakhalanso wotchuka kwambiri ndi mainjiniya chifukwa cha kuphatikizika kwake kwakukulu, ntchito yaing'ono ya malo, kuponderezedwa kwamtundu wamba, magawo a parasitic ndi zina zabwino.

3. Kodi ntchito ya network transformer ndi yotani?Kodi sitingatenge?

Mwachidziwitso, imatha kulumikizidwa mwachindunji ndi RJ45 popanda network thiransifoma, ndipo imathanso kugwira ntchito moyenera.Komabe, mtunda wotumizira udzakhala wocheperako, ndipo ukalumikizidwa ndi mawonekedwe osiyanasiyana amtaneti, udzakhalanso ndi zotsatira.Ndipo kusokoneza kwakunja kwa chip kumakhalanso kwakukulu kwambiri.Mukalumikizidwa ndi netiweki thiransifoma, imagwiritsidwa ntchito kwambiri polumikizira mulingo wazizindikiro.1, Limbikitsani chizindikiro, kuti mtunda wotumizira ukhale wautali;chachiwiri, pangani chip kutha ndi kudzipatula kwakunja, kukulitsa luso lodana ndi kusokoneza, ndikuwonjezera chitetezo cha chip (monga mphezi);chachitatu, chikalumikizidwa ndi magawo osiyanasiyana (monga PHY chip ndi 2.5V, PHY chip ndi 3.3V) ya doko la netiweki, sichingakhudze zida za wina ndi mnzake.

Nthawi zambiri, thiransifoma ya netiweki imakhala ndi ntchito zotumizira ma siginecha, kufananiza kwa ma impedance, kukonza mawonekedwe, kuponderezana kwa ma signal komanso kudzipatula kwamagetsi.