 The use of fibre optic cables as far back as the 1970s does not imply that cable companies were using digital methods to transmit signals as is sometimes assumed by the modern viewer, this is a common misunderstanding.Methods were developed and deployed as far back as the 1970s to transmit analog video using frequency division multiplexing via fibre-optic cabling.Digital signaling is a much more modern practice which only began in the early 2000s.