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Data Communications

Data Communications. Asynchronous Transfer Mode and Frame Relay. What is ATM?. A packet switched, connection-oriented service Local area, metro area, and wide area service Can support real-time traffic and non-real-time traffic (data arrives in order, low delay)

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766 views • 62 slides

William Stallings Data and Computer Communications

William Stallings Data and Computer Communications. Chapter 12 Congestion in Data Networks. What Is Congestion?. Congestion occurs when the number of packets being transmitted through the network approaches the packet handling capacity of the network

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480 views • 45 slides

Token Bucket Leaky Bucket

Token Bucket Leaky Bucket. Leaky Bucket. (a) A leaky bucket with water. (b) a leaky bucket with packets. Token Bucket. We want to allow some burstiness. x(t) is the instantaneous sending rate,. Max bits b(u). Slope= average rate. Max burst rate. Interval size u. b(u)= r u +b.

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964 views • 32 slides

ATM service types

CBR (Constant Bit Rate) rt-VBR (Real-time Variable Bit Rate) nrt-VBR (Non real-time Variable Bit Rate) ABR (Available Bit Rate) UBR (Unspecified Bit Rate). ATM service types. ATM service classes. Four Specified QoS classes are defined: Class 1: (CBR) Suitable for Circuit Emulation.

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311 views • 15 slides

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Peak cell rate - PowerPoint PPT Presentation

Data Communications

William Stallings Data and Computer Communications

Token Bucket Leaky Bucket

ATM service types