Compounds. There are more carbon compounds than there are compounds of all other elements combined. The study of carbon compounds, both natural and synthetic, is called organic chemistry. Plastics, foods, textiles, and many other common substances contain carbon.
backplane is the shared capacity between interfaces on a switch switch fabric is also the shared capacity between interfaces on a switch and can also be the shared capacity between interfaces on multiple switches using some sort of interconnect, typically vendor specific.
When the forwarding capabilities of a backplane or switching fabric are greater then the sum of speeds of all ports (counted twice one for tx and one rx direction) we call the switching fabric non blocking: traffic between a pair of ports is not influenced by what traffic is exchanged on all other ports.