For my degree work, i make some reseaches for different bus systems and i've found ethernet a bit different than others: The old 10Base5 and 10Base2 ethernet used only one pair of conductor to communicate the nodes with each other (coaxial cable) and implemented CSMA/CD to avoid/manage transamission collisions. Thats fine. However modern twisted pair ethernet equipments more likely connected as point to point devices with full-duplex capability, where there's no collision, but still implements CSMA/CD.
It is possible to create an ethernet bus line using only one twisted pair? Or this one conductor line connection is possible only for the old coaxial ethernet?