Honghuang, I am engaged in science and technology in the Wuzu

After the operating system research was completed, Fang Hao handed over the mess to others, there is too much content to develop and mature, and what is needed is the precipitation of time.

Regarding the development of the operating system, the modern earth also took decades to develop the underlying logic, and the operating system did not develop rapidly until the C language matured.

According to Fang Hao’s estimates, it will take a decade or two of technology accumulation to develop a language similar to C, and then develop a real operating system.

Fang Hao naturally can’t accompany them for twenty years, which is a very fortunate errand, and even if the operating system is researched, it is not so simple to popularize it.

Because of the system problems of Redstone City, the current Redstone City is still a tribal division of labor system, and has not yet formed a mature society.

Because of laziness, Fang Hao’s mind moved to network research, how to let two computers communicate on the network, which is a very important research.

As we all know, the network technology on the modern earth has developed very maturely, and a lot of technology has been produced around network communication, which is the accumulation of those experts, and millions of researchers in the whole world are studying communication technology.

Fang Hao doesn’t know much about communication technology, but he can be the founder of the communication industry as a pioneer.

Like the operating system, develop an initial model for everyone, and then let others study according to the principles of the initial model, and gradually develop the communication industry.

Modern communication theory was proposed by Claude Elwood Shannon, an American mathematician and founder of information theory.

Claude Shannon’s contribution is based on information theory based on Shannon’s three theorems, and the status of information theory in the electronics industry is like the status of Newtonian mechanical systems in classical physics, mobile Internet, various software and even artificial intelligence, all based on Shannon’s information theory.

Shannon’s three theorems illustrate the laws of communication.

Shannon’s first theorem: variable-length undistorted source coding theorem.

Shannon’s second theorem: the coding theorem for noisy channels.

Shannon’s third theorem: the lossy source coding theorem.

Because of its importance, Fang Hao had to copy Claude Shannon’s theory, use mathematics to derive information theory, and then publish it in the journal of Redstone City to promote the development of information science.

But there was another problem, he also had to publish papers in the field of mathematics so that others could understand it.

In other words, how Claude Shannon proposed information theory is a tortuous process, so Fang Hao’s research process is also tortuous, and his head is as big as a fight.

The study of network communication simply means to correspond the “true” and “false” of Boolean algebra and the “on” and “off” of circuit systems, and express them with 1 and 0, and then use Boolean algebra to analyze and optimize switching circuits, which is information theory.

In essence, it is a discipline that links circuits and mathematics, studying the generation, acquisition, transformation, transmission, storage, processing, identification and utilization of information, studying channel capacity, message coding and modulation, noise and filtering theory, etc., semantic information, effective information and fuzzy information.

Special information theory focuses on coding theory, mainly studying information system models, information measurement, information capacity, coding theory and noise theory.

Generalized information theory is the modern information science of the earth, mainly studying computer processing, such as text processing, image recognition, machine learning theory and its various applications.

No matter how it is defined, it is inseparable from the problem of how to get two computers to exchange data, this simple problem does not need to use the Shannon theorem.

Fang Hao began to think.

How to communicate inside a computer, Redstone City has figured out the mechanism inside, and it is no longer a problem.

But how the two computers communicate, although Redstone City has begun to study and carry out many experiments, but the progress is slow and the effect is not ideal.

Combined with the principle of network communication on the earth, he began to think about how to carry out network communication, the method of network communication is the network protocol, but unfortunately Fang Hao does not know the specific content of the network protocol, only remembers that there are seven layers.

These seven layers are the application layer, presentation layer, session layer, transport layer, network layer, data link layer, physical layer, each layer has its own functions, and the seven layers constitute a complete network protocol.

Each layer needs the support of the next layer, and the physical layer is the lowest part, which is also the simplest layer.

The easiest design should be the physical layer, that is, a hardware connection, and there will be a wireless transceiver module as the physical layer in the future, but the physical layer of today’s primitive level computer is naturally a wire, which can send and receive 0, 1 information.

For example, adding a 5V voltage means 1, and ground means 0, in other words, the physical layer is a data line connected and then adding a power supply to it.

Fang Hao quickly designed, drew two computers on paper, connected a wire to the two computers, and then connected this wire to a 5V power supply, and then added a discharge switch to it.

“Xiao Mo, this is a computer network framework, you go and let the semiconductor laboratory make this, you also go to join the research team, this project is very important, you go and do a good job of data collection.” After drawing the design drawing, writing the principle description, and designing the requirements, Fang Hao gave this document to his assistant.

“Good! I’ll go right away. Xiao Mo didn’t talk nonsense and took the documents and left.

In fact, if you want to design it according to this document, you need a lot of work to do, such as how to use the switch to control this power supply, how to use the switch to discharge this line.

The switch naturally can not be controlled by hand, can only use the chip to control, and the power supply on and off, the power switch and the grounded switch is also ordered, if the switch sequence is wrong, it will cause the power supply to be directly grounded, resulting in the power supply burning.

These functions naturally need to be added to the two computers, so that their physical layers can be connected with a single wire.