Data signal transmission refers to the process of transmitting data in the form of signals. In this process, the data is first converted into a signal form suitable for transmission, and then sent to the receiving end through transmission media such as cables, optical fibers, wireless, etc. At the receiving end, the signal is restored to its original data form for further processing or use.

Data signal transmission involves many key technologies and concepts, such as modulation/demodulation, encoding/decoding, parallel and serial transmission, synchronous and asynchronous transmission, etc. Modulation/demodulation is the process of converting data signals into analog signals suitable for transmission in a transmission medium or extracting data signals from analog signals. Encoding/decoding is the process of converting data into a specific encoding format or restoring the original data from the encoding format.

In data signal transmission, there are two basic transmission methods: parallel transmission and serial transmission. Parallel transmission is the simultaneous transmission of multiple bits of data (usually a byte or word) through multiple parallel channels. This method has a fast transmission speed, but requires more transmission lines and interfaces. Serial transmission refers to the transmission of data bit by bit through a single channel. Although the transmission speed is relatively slow, serial transmission requires fewer transmission lines and interfaces, resulting in lower costs.

In addition, according to the synchronization method of data signals, data signal transmission can be divided into synchronous transmission and asynchronous transmission. Synchronous transmission refers to the synchronization of the clocks of the sender and receiver, and the transmission of data is carried out at a fixed clock beat. Asynchronous transmission refers to the fact that the clocks of the sender and receiver are independent, and data transmission is defined by specific start and end flags.

In modern communication networks, the speed, distance, and reliability of data signal transmission have been greatly improved. The rapid development of technologies such as fiber optic communication, satellite communication, and mobile communication has provided more options and possibilities for data signal transmission.