A system that gives rise to rapidinternetaccess through cables, optic fibres or satellites using electromagneticwaves with a range of frequencies.
The signals transmitted can be either analogue or digital.
These frequencies can be divided into separate bands, where each band carries a separatechannel of data
Multiplexing
light is made of different wavelengths. Worked out how to use this to our advantage by sending different wavelengths of light down the same individual optical fibre
This is called ‘multiplexing’ and each wavelength carries data. This means more information can be carried through a singlefibre = improvedefficiency
