SolStd08 - CHAPTER 8 Switching Solutions to Odd-Numbered...

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1 CHAPTER 8 Switching Solutions to Odd-Numbered Review Questions and Exercises Review Questions 1. Switching provides a practical solution to the problem of connecting multiple devices in a network. It is more practical than using a bus topology; it is more effi- cient than using a star topology and a central hub. Switches are devices capable of creating temporary connections between two or more devices linked to the switch. 3. There are two approaches to packet switching: datagram approach and virtual- circuit approach . 5. The address field defines the end-to-end (source to destination) addressing. 7. In a space-division switch, the path from one device to another is spatially separate from other paths. The inputs and the outputs are connected using a grid of elec- tronic microswitches. In a time-division switch, the inputs are divided in time using TDM. A control unit sends the input to the correct output device. 9. In multistage switching, blocking refers to times when one input cannot be con- nected to an output because there is no path available between them—all the possi- ble intermediate switches are occupied. One solution to blocking is to increase the number of intermediate switches based on the Clos criteria. Exercises 11. We assume that the setup phase is a two-way communication and the teardown phase is a one-way communication. These two phases are common for all three cases. The delay for these two phases can be calculated as three propagation delays
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This note was uploaded on 09/16/2010 for the course SETAS ETEC301 taught by Professor Multiple during the Winter '09 term at Centennial College.

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SolStd08 - CHAPTER 8 Switching Solutions to Odd-Numbered...

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