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ATM
PRADEEP THOMAS THUNDIYIL
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Introduction
• Circuit Switched.• Cell Based.• Statistical Multiplexed.• Sophisticated QoS.• Virtual Path.• Virtual Connections.
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ATM Service Categories
• The ATM layer supports five service categories:
• Real-time Services1. Constant Bit Rate (CBR)2. real-time Variable Bit Rate (rt-VBR)
• Non-real-time Services3. Non-real-time Variable Bit Rate (nrt-VBR)4. Unspecified Bit Rate (UBR)5. Available Bit Rate (ABR).
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ATM Capacity Allocation
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ATM Layer Diagram
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AAL Layer Service Category
Network Priority Cell Loss
AAL 1 CBR, connection oriented, Circuit Emulation
CBR -1 Low
AAL 2 RT VBR , conn oriented, synchronous (doesn ve SAR)
RT VBR - 2 Med
AAL ¾ NRT ,async, connectless
NRT VBR - 3 Med
AAL 5 Similar to AAL ¾, simplified header
VBR , connection oriented async
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ATM Cell Formation
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Sublayers of AAL
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Cell Header
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Transmission Media
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Virtual Path Switching
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Receiver Modes
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References
• http://www.techfest.com/networking/atm/atmaal.html• campus.murraystate.edu/tsm/tsm241/ATM.ppt• http://www3.rad.com/networks/2005/atmapp/applet.htm