What are the characteristics of data communication compared with telephone communication?

Mainly to transmit the required data, such as our internet network, through network protocols, such as TCPIP protocol, directly send emails, qq chat records and so on.

Telephone communication:

Wired telephone: first, voice is converted into electrical signals, then into numbers by telephone, and then into data communication, which can be spread by means of data communication network.

Wireless telephone: firstly, voice is converted into electrical signal, then modulated into a signal that can be transmitted on the carrier wave, and then communicated with the mobile phone through the base station.

The biggest difference is that wireless communication needs to be modulated to a higher carrier frequency band, and then this signal carrier can spread between the mobile phone and the base station. This band is allocated by the state and needs to be purchased.

If you are not clear, you can email me Gary _ Wang _ 2008 @163.com.