What are the characteristics of ATM technology?

Characteristics of ATM technology: 1. Using fixed-length short message cells as transmission units, it is conducive to broadband high-speed switching. 2. Support various services at different rates, using optical fiber transmission, without the need for error control and flow control at the data link layer. 3. The lowest layer is connection-oriented transmission, and circuit switching ensures real-time and quality of service.

The keyboard can send codes at any time, depending on the user's input speed, and the internal hardware must be able to receive a typed character at any time. ATM can ideally implement various QoS, and can support both connected services and connectionless services. It is a model of broadband ISDN (B-ISDN) technology.

Characteristics of ATM technology:

1. Using fixed-length short cells as transmission units, it is conducive to broadband high-speed switching.

2. Support various services at different rates and use fiber optic transmission, eliminating the need for error control and flow control at the data link layer.

3. The lowest layer is connection-oriented transmission, and circuit switching ensures real-time and quality of service.

ATM

ATM, as the name suggests, is the asynchronous transmission mode, which is the standard established by the International Telecommunications Union ITU-T. In fact, in the mid-1980s, people had already begun experiments with fast packet switching and established a variety of models with different names. Europe focused on image communications and called the corresponding technology asynchronous time division multiplexing (ATD). The United States focused on High-speed data communications calls the corresponding technology Fast Packet Switching (FPS). After coordinated research, the ITU officially named it AsynchronousTransferMode (ATM) technology in 1988 and recommended it as the information transmission mode of the Broadband Integrated Service Data Network B-ISDN. .

ATM is a transmission mode. In this mode, information is organized into cells. Since each cell containing information from a certain user does not need to appear periodically, this transmission mode is asynchronous. .

ATM cells are fixed-length packets, with a maximum length of 53 bytes and are divided into 2 parts. The first 5 bytes are the header, which mainly completes the addressing function; the last 48 bytes are the information segment, used to load information from different users and different services. All digital information such as voice, data, images, etc. must be cut, encapsulated into uniform format cells, transmitted in the network, and restored to the required format at the receiving end. Because ATM technology simplifies the switching process, removes unnecessary data verification, and adopts an easy-to-process fixed cell format, the ATM switching rate is much higher than traditional data networks, such as x.25, DDN, frame relay, etc.

In addition, for such a high-speed data network, the ATM network adopts some effective business traffic monitoring mechanisms to monitor online user data in real time and minimize the possibility of network congestion. Grant different "privileges" to different services, such as the highest privilege for real-time voice, the highest privilege for correctness of general data file transmission, and the network allocates different network resources to different services, so that different services can achieve "peace" in the network *** place".