iindaba

Kwizixhobo ze-Ethernet, xa i-PHY chip ixhunyiwe kwi-RJ45, i-transformer yenethiwekhi idla ngokudibaniswa.Enye i-network transformer center itephu esezantsi.Ezinye zixhunywe kunikezelo lwamandla, kwaye ixabiso lonikezelo lwamandla lingahluka, 3.3V, 2.5V, 1.8V.Indlela yokudibanisa impompo ephakathi ye-transformer (PHY ekupheleni)?

A. Kutheni ezinye iimpompo eziphakathi ziqhagamshelwe kubonelelo lombane?Isiseko esithile?

Oku kumiselwa ikakhulu ngumqhubi we-UTP uhlobo lwe-phy chip.Uhlobo lokuqhuba luhlulwe kwi-voltage drive kunye nokuqhuba ngoku.Xa uqhuba nge-voltage, idibaniswa nokunikezelwa kwamandla;xa uqhuba ngoku, idibaniswe ne-capacitor emhlabeni.Ngoko ke, indlela yokudibanisa yempompo yeziko inxulumene ngokusondeleyo nohlobo lomqhubi we-UTP we-phy chip, kunye nedatha yedatha kunye noyilo lwereferensi ye-chip.

Qaphela: ukuba itephu ephakathi iqhagamshelwe ngokungachanekanga, i-port yenethiwekhi iya kungazinzi kakhulu okanye ivalwe.

B. Kutheni ii-voltages ezahlukeneyo ziqhagamshelwe kunikezelo lwamandla?

Oku kukwamiselwa yinqanaba lezibuko le-UTP elichazwe kwidatha yechip ye-PHY esetyenzisiweyo.Inqanaba kufuneka liqhagamshelwe kwi-voltage ehambelanayo, oko kukuthi, ukuba i-1.8V, idonsa ukuya kwi-1.8V, ukuba i-3.3V, idonsa ukuya kwi-3.3V.

Umbindi wesiphumo sempompo:

1. Ngokubonelela ngendlela yokubuyisela i-impedance ephantsi yengxolo yemowudi eqhelekileyo kumgca wokuhlukana, imodi eqhelekileyo yangoku kunye ne-voltage mode eqhelekileyo kwikhebula iyancitshiswa;

2. Ukubonelela nge-DC bias voltage okanye umthombo wamandla kwezinye ii-transceivers.

I-RJ45 edibeneyo yokunyanzeliswa kwemodi eqhelekileyo inokwenza ngcono, kwaye impembelelo yeeparameters zeparasitic zincinci;Ngoko ke, nangona ixabiso liphezulu kakhulu, likwadume kakhulu kwiinjineli ngenxa yokuhlanganiswa kwayo okuphezulu, indawo encinci yokusebenza, ukunyanzeliswa kwemowudi eqhelekileyo, iiparamitha zeparasitic kunye nezinye iingenelo.

3. Yintoni umsebenzi we-network transformer?Ngaba asinakuyithatha?

Ngokwethiyori, inokudityaniswa ngokuthe ngqo kwi-RJ45 ngaphandle kwe-transformer yenethiwekhi, kwaye inokusebenza ngokuqhelekileyo.Nangona kunjalo, umgama wothumelo uya kuncitshiswa, kwaye xa uqhagamshelwe kwi-interface yezinga elihlukeneyo lenethiwekhi, kuya kuba nefuthe.Kwaye ukuphazamiseka kwangaphandle kwi-chip nako kukhulu kakhulu.Xa uqhagamshelwe kwi-transformer yenethiwekhi, isetyenziselwa ikakhulu ukudibanisa inqanaba lomqondiso.I-1, Yandisa umqondiso, ukuze umgama wothumelo ube mde;okwesibini, yenza i-chip iphele kunye nokwahlukaniswa kwangaphandle, ukuphucula isakhono sokuchasana nokuphazamiseka, kunye nokwandisa ukhuseleko lwe-chip (njengombane);okwesithathu, xa uqhagamshelwe kumanqanaba ahlukeneyo (njengezinye i-chip ye-PHY yi-2.5V, enye i-chip ye-PHY yi-3.3V) ye-port yenethiwekhi, ayiyi kuchaphazela izixhobo zomnye nomnye.

Ngokubanzi, i-network transformer inemisebenzi yokuhanjiswa komqondiso, ukuthelekisa i-impedance, ukulungiswa kwe-waveform, ukucinezelwa kwe-clutter yesignali kunye nokwahlulwa kwamandla ombane aphezulu.