What Is Data Terminal Equipment?

Data terminal equipment (data terminal equipment), is the end equipment or end system in the data communication system, referred to as DTE. It can be a data source (the generator of the data), a data sink (the receiver of the data), or both.

Data terminal equipment (data terminal equipment), is the end equipment or end system in the data communication system, referred to as DTE. It can be a data source (the generator of the data), a data sink (the receiver of the data), or both.
Chinese name
Data terminal equipment
Foreign name
dataterminal equipment
Applied discipline
Computer, communication

Data terminal equipment related background

Device, PC or terminal at one or the other end in data transmission.
A data terminal equipment (DTE) is an end node in an X.25 network. DTE is a device on a user network interface that serves as a data source, destination, or both. The DTE is connected to a data network through a DCE device and typically using a clock signal generated by the DCE. DTE includes equipment such as computers, protocol converters, and multiplexers. Data terminal equipment, computer display terminal, is the input and output equipment of computer system. Computer display terminals are produced with the centralized processing mode of the host era, and continue to progress with the development of computing technology, and continue to produce advanced displays.
DTE and data circuit termination equipment (DCE) together form a data station, as shown in Figure 1.
Figure 1 Schematic diagram of the data communication system
DTE can be a host or pre-processor, or a computer terminal with communication functions, such as a smart terminal implemented with a microcomputer. Therefore, DTE has a different meaning from what is called a terminal device in a general computer system. The latter is a peripheral device of the computer system and can be directly connected to the host without the need for remote communication or networking functions. The DTE referred to here is a part of the data communication system. It is used as a data source / sink. , Must also implement the function of data communication according to a certain protocol. Therefore, the two are concepts that belong to two different categories. The data communication functions of DTE include: connection with DCE to realize data transmission and reception; control of data links; network functions corresponding to the connected data network; and efficient data transmission between DTEs at both ends Other functions required by the clearing house. Some of these functions are implemented in hardware, but most of them rely on software, and are generally constructed with a modular structure. DTE can be a single device or a combination of two or more devices.

Data terminal equipment development

The development of the terminal So far, the computing technology has experienced three development periods: the host era, the PC era, and the network computing era. The terminal is compatible with the three stages of the development of computing technology. The application has also experienced character dumb terminals, graphic terminals, and network terminals. These three patterns.

Classification of data terminal equipment terminal

Terminal Equipment
Common client devices fall into two categories: one is a fat client, and the other is a thin client. Then, the devices with more powerful functions based on open industry standard architectures represented by PCs are called "fat clients", and others are classified as "thin clients". The space and scale of the thin client industry is also large, no less than the current scale of the PC.
1. From a technical perspective, the data processing model will move from decentralized to centralized, the user interface will be more humane, and manageability and security will also be greatly improved; meanwhile, communication and information processing methods will also be fully networked and unprecedented. System scalability and cross-platform capabilities. Terminal Equipment
Terminal Equipment
2. In terms of application form, network terminal equipment will not be limited to the traditional desktop application environment. With the diversification of connection methods, it can be used as a desktop device, and can also be used in mobile and portable ways. Terminal devices will be diversified. Product form; In addition, with the expansion of cross-platform capabilities, in order to meet the needs of different system applications, network terminal equipment will also appear with many faces: Unix terminals, Windows terminals, Linux terminals, Web terminals, Java terminals, and so on.
3 From the perspective of application fields, the era of terminal devices in the era of character dumb terminals and graphic terminals can only be used in the window service industry and counter services. Gone are the days when non-counter services such as online banking, online securities, and low-bank counter services will be widely used. Access using terminal equipment
Network terminal equipment. At the same time, the application field of network terminal equipment will also rapidly expand to emerging non-financial industries such as telecommunications, power, taxation, education, and government.

Data terminal equipment difference

DTE is a data terminal device, such as a terminal. It is a broad concept. A PC can also be a terminal. (General DTE equipment commonly used in WAN are: router, terminal host)
DCE is a data communication device, such as a MODEM, a communication device connected to a DTE device. (General DCE equipment commonly used in WAN are: CSU / DSU, WAN switch, MODEM)
The difference between DTE and DCE is that the DCE side provides the clock. DTE does not provide the clock, but it relies on the clock provided by DCE to work, such as between a PC and a MODEM. Data transmission is usually a path through DTE-DCE and then through DCE-DTE. In fact, for a standard serial port, it can usually be judged whether it is DTE or DCE from the appearance, DTE is a needle (commonly known as male), DCE is a hole (commonly known as female), so that the two interfaces can be connected together.
When routers are connected through a serial port, it generally does not matter which end is connected to DCE and which end is connected to DTE. Generally, it is the core layer to do DCE. Some are defaulted. For example, the modem is always DCE. When DCE does not set the clock rate, communication is impossible.
DTE compares DCE with the acronym DCE of Data Communications Equipment, which provides signal conversion and encoding functions between DTE and transmission lines, and is responsible for establishing, maintaining, and releasing link connections, such as modems. DCE equipment is usually connected to DTE, so the pin assignments are reversed, that is, 2 is for receiving and 3 is for sending. The difference between them is that the DCE side provides the clock.
A router is usually a DTE device. Transmission equipment such as modems and GV converters are usually specified as DCE. For example, it is at the edge of the network. It has an S0 port and needs to learn some parameters from another router. At this time, we do not need to configure the "clock rate" on this S0 port, it learns from the other party. At this time, it is DCE, and the other party is DCE. When the router is used as the DCE to provide the clock frequency, it needs to be set up. For the router's back-to-back experiment, two routers are used as the DCE and one is used as the DTE. 64000, or 64000 in timeslots, only 56000 for ordinary dial-up serial ports, set the DTE, DCE, DCE, and DCE clock rates to be consistent. If you cannot determine which router has the DTE end of this cable, which one The router has a DCE end. You can use show controller serial 0 to determine the difference between DTE and DCE. In fact, it is only for the serial port. The router usually connects to the wide area network through the serial port. The serial V.24 port (25 pins) usually stipulates that the DTE uses the second pin as the TXD (transmitting data line). The serial V.35 (34 pins) is the communication interface standard commonly used by routers, but V.35 For transmission of differential signals, sending and receiving are respectively undertaken by two signal lines. The DCE device is usually connected to the router, so the pin assignment is reversed, that is, 2 is for receiving (but also called TXD), and 3 is for sending.

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