What is a computer communication system and what is the difference between a computer network and a

Generally, the computer network is called Ye Zheng to do the business network. A communication network is called a transport network.

Computer network is one of the services of communication network. For example, optical communication networks include SDH, PTN, and OTN. A communication network transmits data on a computer network as a service.

Computer networks tend to dictate requirements for the content of communication between the two parties, such as protocols and models, and are more like resource subnets. The communication network is biased towards the physical solution that realizes the communication between the two parties, as if a road was actually built when the two sides communicated, and it is more like a communication subnet.

Before the mid-60s of the 20th century, the first generation of computer networks was a remote online system centered on a single computer, and the typical application was an airplane booking system composed of a computer and more than 2,000 terminals in the United States, the terminal was a peripheral device of a computer, including a display and keyboard, without CPU and memory.

With the increase in the number of remote terminals, a front-end unit (FEP) has been added in front of the host. At that time, computer networks were defined as "systems that are connected for the purpose of transmitting information, enabling telematics, or further sharing of resources," and such communication systems already had the rudiments of a network.

The difference lies in the difference between the training goals and knowledge abilities.

The training goals are different:

Communication Engineering: Students in this major mainly learn the basic theories, composition principles and design methods of communication systems and communication networks, receive basic training in communication engineering practice, and have the basic ability to engage in the design, development, commissioning and engineering application of modern communication systems and networks.

Computer: This major cultivates students with good scientific literacy and a systematic grasp of the basic theories, basic knowledge and basic skills and methods of computer science and technology, including computer hardware, software and applications. Senior specialized scientific and technological personnel.

Knowledge and ability requirements are different:

Communication Engineering. 1) Master the basic theories and basic knowledge in the field of communication.

2) Master light wave, wireless, multi-** and other communication technologies.

3) Master the analysis and design methods of communication systems and communication networks.

4) Have the basic ability to design, develop, commission, and apply communication systems and communication networks.

5) Understand the basic guidelines, policies and regulations of communication systems and communication network construction.

Computer. 1) Master the basic theories and basic knowledge of computer science and technology.

2) Master the basic methods of analysis and design of computer systems.

3) Have the basic ability to research and develop computer software and hardware.

4) Understand computer-related regulations.

5) Understand the development trends of computer science and technology.

From the point of view of the difficulty of learning, although the computer major and the communication engineering major have a certain degree of difficulty, the learning pressure of communication engineering is often greater, and the difficulty of the professional course of communication engineering is relatively high, which the students of communication engineering will have a deeper experience. In fact, this is also where many people may misunderstand, many people will think that computer science is more difficult to learn than communication engineering, in fact, communication engineering is still relatively difficult to learn.

The study of computer-related majors is often more biased towards software, even for computer science and technology majors, they are often more biased towards software in the setting of professional courses, including operating systems, program design, data structures, algorithm design, compilation principles, etc., so although the amount of knowledge is relatively large, the experimental environment is not difficult to build, and it will be easier to learn.

From the perspective of the current large innovation and entrepreneurship environment, innovation based on technology platforms is also a relatively obvious development trend, as large Internet (technology) companies have opened up their own technology platforms, including cloud computing, big data, Internet of Things, artificial intelligence and other platforms, these technology platforms will gradually build a huge ecosystem.

Traditional industries can complete a lot of industry innovation around these ecosystems, and this process will also require a large number of computer professionals. From this point of view, there will be more employment opportunities if you choose to major in computer science at the moment.

The two basic modes of communication of computers are serial communication and parallel communication.

Serial communication refers to the communication method in which one bit of metadata is transmitted at a time on a computer bus or other data channel, and the above single process is carried out continuously. Serial communication is used for long-distance communication as well as for most computer networks.

Parallel communication is communication on a serial port by simultaneously transmitting several bits of metadata at once. Multi-bit data is transmitted through parallel lines at the same time, so that the data transmission speed is greatly improved, but the length of the parallel transmission line is limited, because the length increases, the interference will increase, and the data will be prone to errors.

The communication system is generally composed of three parts: the transmitter (the source of the signal and the residual cavity of the transmission equipment), the channel receiving equipment (the host and the receiving equipment), and the noise source.

The source is the ** of the information, and its function is to convert the original signal into the corresponding electrical signal, that is, the baseband signal. The function of the transmitting device is to perform various transformations and processing of the baseband signal, such as amplification and modulation.

The channel is the transmission medium for transmitting the signal, and the host is the receiver of the information, corresponding to the source. The function of the receiving device is the opposite of that of the sending device, which processes and transforms the received signal.

A noise source is a concentrated representation of noise in the channel and scattered elsewhere in the communication system.

Computer communication network: It is a system that uses communication equipment and lines to interconnect multiple computer systems with different geographical locations and independent functions, and realizes resource sharing and information transmission in the network with perfect network software (network communication protocol, information exchange mode and network operating system, etc.).

A computer network communication system is: a data communication system.

A data communication system is a combination of computer and communication. In the early 50s of the 20th century, the United States created a semi-automatic ground-based air defense (SAGE) system, which connected long-range radars and other equipment with computers, creating early data communication systems. Subsequently, data communication systems have developed rapidly, going through the evolution of centralized systems, distributed systems, and computer networks.

The centralized data communication system is composed of a first-class computer and a number of remote data terminal equipment, which is centrally processed by the first-class computer, and the system management and control are simple, but the economy and reliability are poor.

With the decentralized setting of the first computer, as well as the emergence of pre-processors, concentrators and intelligent terminals, a distributed data communication system characterized by decentralized communication processing functions and data processing functions has emerged. In the late 60s, a number of independent computer systems were interconnected to achieve the purpose of resource sharing.

a. Electrical signal transmission system.

b. Text communication system.

c. Signal communication system.

d. Data communication system.

1. The computer network communication system is a data communication system, and the data communication system refers to the system that connects the data terminal equipment distributed in remote places with the computer system through data circuits to realize data transmission, exchange, storage and processing.

2. Communication Network System (CNS) Communication Network System: It is the basis of voice, data and image transmission in the building, and is connected to external communication networks (such as public networks, integrated business digital networks, computer Internet, data communication networks and satellite communication networks, etc.) to ensure the smooth flow of information. The CNS should be able to provide effective information services to the owners (managers) of the building or complex and to the various users of the building form.

The CNS should be capable of receiving, storing, processing, exchanging, transmitting, and providing decision-making support for a wide range of information from inside and outside the building or complex. The various services and service interfaces provided by CNS should be able to be embedded and led to each user terminal through the wiring system in the building.