Time signals are important prerequisites for the modern communication society.
Whether in business, industry, administration or research, time
isthe basis for many technical disciplines: in rail traffic, air traffic and shipping as well as in telecommunications networks and mobile radio networks, in radio traffic, in satellite navigation via the GPS system
, indata networks and in computer technology.
In order to have a uniform time reference, highly precise time signals are derived from atomic frequency standards across countries and transmitted via the long-wave transmitter DCF77, via the Internet and the public telephone network.