Feem ntau ntawm HDMI interface yog HOM A, nrog qhov dav ntawm 13.9mm thiab tag nrho ntawm 19 pins. Kuj tseem muaj kev sib txuas ua ob hom HOM B interface uas tsis tshua muaj, uas muaj qhov dav ntawm 21.2 hli. HDMI siv 4 txoj kab sib luag TMDS cov paib sib txawv, thiab cov xov tooj sib kis muaj peb kab ntawv xaib thiab ib lub moos channel.
Peb ntawm cov xov tooj sib kis tau siv los xa cov xim liab, ntsuab, thiab xiav cov cim, thiab cov channel thib plaub yog siv los xa lub moos, thiab nws cov sijhawm ua haujlwm yog 1/10 ntawm cov ntaub ntawv tus nqi. TMDS thev naus laus zis siv los ntawm HDMI, cov teeb meem sib txawv tsis sib xws hom bias voltage yog +3.3V, qhov chaw nres nkoj tsis sib xws yog 50 ohms, qhov ntsuas suab nrov nce mus txog 500mV (+2.8V ～ .33.3V), thiab cov viav vias sib txawv ntawm 150mV ～ 800mV.
Ntxiv rau, HDMI tseem muaj DDC (tso tawm cov ntaub ntawv channel) cov ntaub ntawv thiab cov xov tooj moos kom xa cov xov tooj sib txuas lus thiab HDCP (high-bandwidth digital copyright tiv thaiv) teeb liab kis. Lub npav DDC yog tus yuam sij rau HDMI li kev sib raug zoo. Yog tias ib qho khoom siv twg tsis txuas nrog HDMI 1.3, tag nrho cov kab ke yuav cia li txuas rau HDMI 1.2 lossis qis dua los ntawm DDC channel kom paub meej tshaj. DDC muaj num ntau hauv HDMI cov xaim hluav taws xob. Lawv tsis tsuas yog nqa cov ntaub ntawv sib txuas lus sib koom tes, tab sis kuj txuas ntxiv dhau HDCP encryption tuav. Yog tias HDCP sib tau, lub teeb liab digital tuaj ntawm qhov tseem ceeb xav tau txuas ntxiv mus txuas ntxiv.
