HDMI+ethernet, ¿Como funciona esto?

Principal
Emotiva UMC-200 + etapa atm mod. EPM1 20W pure class A + etapa atm EPM55 (5x180W) + Oppo BDP105 + iPlus + Vienna Acoustics Mozart Grand (trio frontal) + Linn Komponent 106 (surround) + Linn Afekt (sub) + Panasonic VT20 + Optoma HD25

Despacho
Emotiva Fusion 8100 + etapa atm miniEPM1 (8w pure class A)+ 5xLM3886 multichannel + Mac mini + PMC DB2 (frontales) + Electrovoice EV2 (surround) + Jamo tuneado (sub) + Dell 24"