What technology does the x.25 protocol use?

The "x.25" protocol uses packet switching technology; the "x.25" protocol is a computer-oriented data communication network, consisting of basic equipment such as transmission lines, packet switches, remote concentrators, and packet terminals. Adopting a layered architecture, negotiation, control and information transmission of information exchange are carried out between the peer layers of the interface through the communication protocol between the peer layers.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

What technology is used in the x.25 protocol?

Packet switching technology

The X.25 protocol is a widely used protocol. It was proposed by ITU-T and is a computer-oriented data communication network. It consists of basic equipment such as transmission lines, packet switches, remote concentrators and packet terminals.

The X.25 protocol adopts a layered architecture and is divided into three layers from bottom to top: physical layer, data link layer and packet layer, which respectively correspond to the lower three layers of the OSI reference model. Each layer is functionally independent of each other. Each layer accepts the services provided by the next layer and also provides services for the upper layer. Adjacent layers communicate through primitives. Negotiation, control and information transmission of information exchange are carried out between the peer layers of the interface through the communication protocol between the peer layers.

The X.25 protocol is a standardized interface protocol. Any terminal device that wants to access the packet-switched network must meet the protocol's regulations at the interface. There are no more than two types of terminal equipment that need to be connected to the packet switching network: one is a terminal that has X.25 protocol processing capabilities and can be directly connected to the packet switching network, which is called a packet terminal (PT: packet terminal); The other type is a terminal that does not have X.25 protocol processing capabilities and must undergo protocol conversion before it can access the packet switching network. It is called a non-packet terminal (NTP: non-packet terminal).

Brief introduction

The X.25 interface protocol was first proposed in 1976. It was formulated on the basis of the Canadian DATAPAC public packet network related standards. , 1984, 1988 and 1993 and underwent several modifications. It is currently the most widely used packet switching protocol. The X.25 protocol is an interface protocol between data terminal equipment and data circuit terminating equipment (DCE: data circuit terminating equipment). The formulation of this protocol realizes the standardization of the interface protocol, allowing various DTEs to freely connect to various packets Exchange online. As an interface protocol between user equipment and the network, the Business and optional business, etc. The X.25 protocol initially provided virtual circuit and datagram access for DTE to access the packet-switched network. After that, the X.25 protocol canceled the datagram mode.

Features:

The advantages of X.25 are economical, easy to install, high transmission reliability, and suitable for channels with high bit error rates.

The disadvantages of X.25 are that the repeated error checking process is quite time-consuming and lengthens the transmission time, the protocol is complex, the delay is large, the packet length is variable, and the storage management is complex.

The rate of X.25 can be as high as 64K bps (or 64kbit/s).

For more related knowledge, please visit the FAQ column!

The above is the detailed content of What technology does the x.25 protocol use?. For more information, please follow other related articles on the PHP Chinese website!