izindaba

Emishinini ye-Ethernet, lapho i-PHY chip ixhunywe ku-RJ45, i-transformer yenethiwekhi ngokuvamile iyengezwa.Esinye isikhungo se-transformer sithinta phansi.Ezinye zixhunywe kugesi, futhi inani lamandla lingahluka, 3.3V, 2.5V, 1.8V.Ungakuxhuma kanjani umpompi omaphakathi we-transformer (PHY end)?

A. Kungani abanye ompompi abaphakathi bexhunywe kugesi?Isisekelo esithile?

Lokhu kunqunywa ikakhulukazi uhlobo lomshayeli we-UTP we-phy chip.Uhlobo lokushayela luhlukaniswe ngokushayela kwe-voltage kanye nokushayela kwamanje.Uma ushayela nge-voltage, ixhunywe nokunikezwa kwamandla;lapho ushayela nge-current, ixhunywe ne-capacitor emhlabathini.Ngakho-ke, indlela yokuxhuma kampompi ophakathi nendawo ihlobene eduze nohlobo lomshayeli wembobo ye-UTP ye-phy chip, kanye nemininingwane yedatha kanye nomklamo wereferensi we-chip.

Qaphela: uma umpompi ophakathi uxhumeke ngendlela engalungile, imbobo yenethiwekhi izozinza ngokwedlulele noma ivinjwe.

B. Kungani ama-voltage ahlukene exhunywe kugesi?

Lokhu futhi kunqunywa ileveli yembobo ye-UTP ecaciswe kudatha ye-PHY chip esetshenzisiwe.Izinga kufanele lixhunywe ku-voltage ehambisanayo, okungukuthi, uma i-1.8V, idonsela ku-1.8V, uma i-3.3V, idonsele ku-3.3V.

Umthelela wokuthepha ophakathi:

1. Ngokuhlinzeka ngendlela ephansi yokubuya kwe-impedance yomsindo wemodi evamile emgqeni wokuhlukanisa, imodi evamile yamanje kanye nemodi evamile ye-voltage kukhebula iyancishiswa;

2. Nikeza nge-DC echemile kagesi noma umthombo wamandla kwamanye ama-transceivers.

I-RJ45 ehlanganisiwe yokucindezela imodi evamile ingenza kangcono, futhi ithonya lamapharamitha we-parasitic lincane kakhulu;ngakho-ke, nakuba intengo iphakeme kakhulu, ibuye idume kakhulu konjiniyela ngenxa yokuhlanganiswa kwayo okuphezulu, umsebenzi omncane wesikhala, ukucindezelwa kwemodi evamile, imingcele ye-parasitic nezinye izinzuzo.

3. Uyini umsebenzi we-network transformer?Ngeke yini sikuthathe?

Ngokweqile, ingaxhunywa ngokuqondile ku-RJ45 ngaphandle kwe-transformer yenethiwekhi, futhi ingasebenza ngokujwayelekile.Kodwa-ke, ibanga lokudlulisela lizokhawulelwa, futhi uma lixhunywe esixhumi esibonakalayo senethiwekhi yezinga elihlukile, lizoba nomthelela.Futhi ukuphazamiseka kwangaphandle ku-chip nakho kukhulu kakhulu.Uma ixhunywe ku-transformer yenethiwekhi, isetshenziselwa ikakhulukazi ukuhlanganisa izinga lesignali.1, Thuthukisa isignali, ukuze ibanga lokudlulisela libe lide;okwesibili, yenza i-chip iphele kanye nokuhlukaniswa kwangaphandle, ithuthukise ikhono lokulwa nokuphazamiseka, futhi ikhulise ukuvikelwa kwe-chip (njengombani);okwesithathu, uma kuxhunywe kumazinga ahlukene (njengenye i-chip ye-PHY ingu-2.5V, enye i-chip ye-PHY ingu-3.3V) yembobo yenethiwekhi, ngeke ithinte izisetshenziswa zomunye nomunye.

Ngokuvamile, i-network transformer inemisebenzi yokudlulisa isignali, ukufanisa i-impedance, ukulungiswa kwe-waveform, ukucindezelwa kwe-clutter yesignali kanye nokuhlukaniswa kwamandla aphezulu.