TAILIEUCHUNG - Lecture Wireless and mobile computing – Chapter 10: Communication networks

The following will be discussed in this chapter: Circuit switching vs. packet switching, pro and cons of ckt. switching and pkt. switching, classifications of packet switching techniques, datagram and virtual circuit, comparison of the three techniques, combination of circuit switching and packet switching, asynchronous transfer mode introduction, ATM Protocol, ATM QoS mechanisms. | Communication Networks Lecture 10 1 Overview Circuit Switching Vs. Packet Switching Pro and Cons of Ckt. Switching and Pkt. Switching Classifications of Packet Switching Techniques Datagram and Virtual Circuit. Comparison of the three techniques Combination of Circuit Switching and Packet Switching Asynchronous Transfer Mode Introduction ATM Protocol ATM QoS mechanisms 2 Figure Switched network Switched Network 3 Figure Taxonomy of switched networks Switching Technologies 4 CIRCUIT-SWITCHED NETWORKS A circuit-switched network consists of a set of switches connected by physical links. A connection between two stations is a dedicated path made of one or more links. However, each connection uses only one dedicated channel on each link. Each link is normally divided into n channels by using FDM or TDM. 5 Circuit Switching: Multiplexing a Link Time-division Each circuit allocated certain time slots Frequency-division Each circuit allocated certain frequencies time frequency time Communication Path A path is a route for data to travel between two nodes in a network Dynamic path In this case, the path often changes from packet to packet Example: Packet Switching Static path Path is initially established and it remains unchanged for the duration of the communication session Example: Circuit Switching 7 Circuit Switching Network Lahore Karachi Circuit established and maintained for entire duration of communication. Established Circuit Switch 8 8 Defining Characteristics of Circuit Switching Establish (switch) a path (circuit) between two nodes of communication Maintain the circuit for the full duration of communication session 9 Advantages of Circuit Switching Continuity assured in the order of transmission Audio can be transmitted without streaming provided adequate bandwidth is available Otherwise streaming is necessary The overhead is low in switching a circuit 10 Disadvantages of Circuit Switching Inefficient use of the paths that are available within a network This may

• Quản trị mạng
• Mobile computing
• Wireless and mobile computing
• Services data
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• Differential encoding
• Communication networks
• Virtual circuit
• Transmission fundamentals
• Mobile computing transmission fundamentals
• Mobile computing simulations
• Network simulation
• Addressing routing
• Visualization tool
• Signals for conveying information
• Digital data transmission
• Mobile systems
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• Electronic commerce
• Define mobile commerce
• Personal digital assistant
• Wireless mobile computing
• Lecture Mobile applications overview
• Mobile applications overview
• Mobile computing devices
• Mobile applications becoming ubiquitous
• Mobile cloud computing
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• Cloud computing
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• New mobile medical
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• MCC Architecture
• Advantages of MCC
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• Protocol suit
• Network access layer
• Transport layer