Network, TV penetration rate is higher and higher in recent years, various new terminal, the new technology emerge in endlessly, people talk about hot spot is also one day become a pattern, this lets beneficiaries as the final we made difficult, what is the cable?What is a terrestrial television?What is the single frequency network?
 
First let us know the Terrestrial Television DTT (Digital Terrestrial Television), buy TV set it is not our home, but a way of TV signal transmission.Television station through signals and TV tower and other facilities, and in the atmosphere by radio transmission signal, households to use the antenna signal, viewing to watch television, it is also called wireless television TV or open.Relative, closed-circuit television (CCTV) refers to the CATV cable, also is the people often say that digital cable TV.The same digital TV by multiple located in different locations in the synchronous state radio transmitters, at the same time, with the same Frequency transmitting the same signal, in order to realize the reliable coverage for a certain service area, is the Single Frequency Network, we said referred to as "SFN (Single Frequency Network).