[technology development -25]: integration technology of radio and television network, Internet, telecommunication network and power grid

Preface ：

Radio and television network ： radio and television （Radio and television） It's through radio waves Or wires transmit sound 、 Images 、 Video news dissemination tools . Only broadcast sound , It is called sound broadcasting ; Broadcast images and sounds , Called television broadcasting .

Cable network ：（ Cable TV ,Cable Television, abbreviation CATV） Yes, it is RF cable 、 optical cable 、 Multichannel microwave distribution system （ abbreviation MMDS） Or a combination thereof 、 Distribute and exchange sounds 、 Images And data signal television system

Internet （internet）, Also known as the international network , refer to The Internet A huge network connected with the network , These networks are connected by a common set of protocols , Form a single huge international network logically .

Telecommunication network (telecommunication network)： It is a communication system that constitutes the interconnection of multiple telecommunication systems for multiple users to communicate with each other , It is an important infrastructure for human beings to realize long-distance communication , utilize cable 、 wireless 、 Optical fiber or other Electromagnetic system , delivery 、 Transmit and receive identification 、 written words 、 Images 、 Sound or other signals .

Power grid ： Electric power Various in the system voltage The whole composed of substation and transmission and distribution lines , be called power network . It contains Power transformation 、 Electricity transmission 、 distribution Three units . The task of power network is to transmit and distribute electric energy , change voltage .