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You are here: Home » What is Asynchronous Transfer Mode (ATM)?

By Abhishek Ghosh April 21, 2014 5:39 pm Updated on April 21, 2014

What is Asynchronous Transfer Mode (ATM)?

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Asynchronous Transfer Mode (ATM) is a communication protocol, which is intended for the transmission of voice and video data. The Layer 2 packets are called cells or slots and have a fixed length. This is the Asynchronous Transfer Mode (ATM) we talked about in our article on Internet Exchange Point. In short, Asynchronous Transfer Mode s developed to meet the high demand for transmission capacity for services and applications.

 

Basics About Asynchronous Transfer Mode (ATM)

 

The Asynchronous Transfer Mode was the bet of the traditional telecom industry for broadband communications. It was raised as a tool to build broadband networks (ISDN based on packet switching rather than traditional circuit switching). The deployment of ATM technology has not been as expected by its promoters; ATM is not clear and most appropriate option for current and future networks. ATM has encountered competition from technologies from IT industry, with projects such as VoIP seems to offer the best prospects. Today, ATM is widely used wherever it needs to support at moderate speeds, as in the case of ADSL, although the trend is to replace this technology for other as Ethernet, which is based on data frames. ATM is a core protocol used over the SONET/SDH backbone of the public switched telephone network (PSTN) and Integrated Services Digital Network (ISDN), but its use is declining in favor of all IP.

 

Asynchronous Transfer Mode (ATM) : Architectural Model and Routing

 

The switching of cells is sandwiched between the transmission functions and to adapt the different types of traffic to the switched flows, posing an architectural model of three layers:

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Physical layer : Related to the physical transmission medium, adapted flows, protect header delimits cells and it adapts to the environment.
ATM layer : Performs multiplexing and switching cells.
AAL Layer (ATM Adaptation Layer) : Related to informational flows, flow facilitating the management, connection modes and if necessary, timing reference.

Asynchronous Transfer Mode

ATM provides a connection-oriented service by virtual paths (VP – Virtual Path) and the channels or virtual circuits (VC Virtual Channel). The paths and the virtual channels have the same meaning as virtual channel connections (VCC Virtual Channel Connection) after X.25, indicating the way forwarding to fixed cell.
At the time of establishing communication with a desired quality of service and a destination, searching for the virtual path will follow all the cells. This path does not change for all communication, so if one node goes down communication is lost. When connecting the resources are reserved to guarantee throughout the session for maintaing quality of service to the user.
When a cell arrives at a router, it will change the header according to the table that owns and sends it to the next with a VPI and / or a new VCI.

Tagged With asynchronous transfer mode , atm networking , asynchronous transfer mode ATM , atm network , atm protocol , what is asynchronous transfer mode , windows asynchronous transfer mode nblite

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "What is Asynchronous Transfer Mode (ATM)?," in The Customize Windows, April 21, 2014, January 31, 2023, https://thecustomizewindows.com/2014/04/asynchronous-transfer-mode-atm/.

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