The first ethernet standard specified baseband operation over coaxial cable, which remained the
principal medium until the 1990s when thinner, cheaper twisted pairs came to
dominate the market. The use of coaxial cable for ethernet is still supported by
the standard, but rarely used because coaxial cable is more costly to purchase,
install, and operate for Local Area Networks. Ethernet transmission over coaxial cable continued as consumers
use existing coaxial cable (from cable television or CATV)
installations to carry broadband data into and through the home and office.