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Question: Write a short note on ATM?
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Subject: Computer Communication and Telecom Network

Topic: Data link layer Services and Protocols

Difficulty: Medium

cctn(36) • 247 views
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modified 4 weeks ago by gravatar for fallen#30 fallen#300 written 7 weeks ago by gravatar for awari.swati831 awari.swati831120
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Asynchronous transfer mode (ATM) is a switching technique used by telecommunication networks that uses asynchronous time-division multiplexing to encode data into small, fixed-sized cells. This is different from Ethernet or internet, which use variable packet sizes for data or frames.

ATM is the core protocol used over the synchronous optical network (SONET) backbone of the integrated digital services network (ISDN).

The ATM provides data link layer services that run on the OSI's Layer 1 physical links. It functions much like small-packet switched and circuit-switched networks, which makes it ideal for real-rime, low-latency data such as VoIP and video, as well as for high-throughput data traffic like file transfers.

ATM services generally have four different bit rate choices:

Available Bit Rate: Provides a guaranteed minimum capacity but data can be bursted to higher capacities when network traffic is minimal.

Constant Bit Rate: Specifies a fixed bit rate so that data is sent in a steady stream. This is analogous to a leased line.

Unspecified Bit Rate: Doesn’t guarantee any throughput level and is used for applications such as file transfers that can tolerate delays.

Variable Bit Rate (VBR): Provides a specified throughput, but data is not sent evenly. This makes it a popular choice for voice and videoconferencing.

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written 4 weeks ago by gravatar for fallen#30 fallen#300
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