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Asynchronous Transfer Mode (Atm) Essay

1445 words - 6 pages

Asynchronous Transfer Mode (ATM)
A Case Study

Table of Contents:

Introduction ………………………………… 3
Overview ………………………………… 3
Innovative Aspects ………………………………….. 5
Advantages …………………………………… 6
Disadvantages …………………………………… 6
Conclusion …………………………………… 7

Introduction:
Asynchronous Transfer Mode (ATM) is a high speed network technology which is designed to support both voice and data communications. It was initially developed to ...view middle of the document...

Overview:
The technology allows both public and private ATM networks which gives a seamless and transparent connection from one end user to the other. Each ATM cell contains exactly 53 octets, 5 octets for header 48 octets for data. As a core protocol, ATM is used in Synchronous Optical Networking (SONET)/Synchronous Digital Hierarchy (SDH), which are backbone of Public Switched Telephone Network (PSTN). Internet Service Providers (ISPs) use Asynchronous Transfer Mode on their long-distance private networks. ATMs operate at the Layer 2 (Data Link layer) of the OSI model, over fiber cable or twisted-pair cable (http://www.wanredundancy.com).
The ATM transport hierarchy is shown in the figure below.

The physical layer can be divided into three functional levels:
• Transmission Path Level: This extends between network elements that assemble and disassemble the payload of a transmission system. For end-to-end communication, the payload is end-user information. For user-to-network communication, the payload may be call-control signaling information (call setup and call termination). Cell delineation and header error-control functions are required at the end points of each transmission path.
• Digital Section Level: This refers to the exchanges or signal transfer points in a network that are involved in switching data streams.
• Regenerator Section Level: This is a part of the digital section.

Virtual Channels and Virtual Paths
Logical connections in ATM are referred to as virtual channels. A virtual channel is analogous to a virtual circuit in X.25 or a frame-relay logical connection. It's the basic unit of switching in ATM. A virtual channel is set up between two end users through the network; a variable-rate, full-duplex flow of fixed-size cells is exchanged over the connection. Virtual channels are also used for user/network exchange (control signaling) and network/network exchange (network management and routing).
For ATM, a second sub layer of processing has been introduced that deals with the concept of virtual paths .A virtual path is a bundle of virtual channels that have the same endpoints. Thus, all the cells flowing over all the virtual channels in a single virtual path are switched together. Virtual path can be of three types semi permanent, customer controlled or network controlled ( http://www.informit.com).
The ATM functionality corresponds to the physical layer and the data link layer of the OSI reference model. The reference model is composed of the following planes, which consist of all layers:
• Control-This plane is responsible for generating and managing signaling requests.
• User- This plane is responsible for managing the transfer of data.
• Management-This plane contains two components: -Layer management manages layer-specific functions, such as the detection of failures and protocol problems. -Plane management manages and coordinates functions related to the complete system (Nake, 2013)
ATM is...

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