This chapter is the executive summary for the book: it provides a quick way to find a range of analytical solutions for a variety of design and performance issues relating to IP and ATM traffic problems. If you are already familiar with performance evaluation and want a quick overview of what the book has to offer, then read on. Otherwise, you’ll probably find that it’s best to skip this chapter, and come back to it after you have read the rest of the book – you’ll then be able to use this chapter as a ready reference. . | Introduction to IP and ATM Design Performance With Applications Analysis Software Second Edition. J M Pitts J A Schormans Copyright 2000 John Wiley Sons Ltd ISBNs 0-471-49187-X Hardback 0-470-84166-4 Electronic 2 Traffic Issues and Solutions short circuits short packets This chapter is the executive summary for the book it provides a quick way to find a range of analytical solutions for a variety of design and performance issues relating to IP and ATM traffic problems. If you are already familiar with performance evaluation and want a quick overview of what the book has to offer then read on. Otherwise you ll probably find that it s best to skip this chapter and come back to it after you have read the rest of the book - you ll then be able to use this chapter as a ready reference. DELAY AND LOSS PERFORMANCE In cell- or packet-based networks the fundamental behaviour affecting performance is the queueing experienced by cells packets traversing the buffers within those switches or routers on the path s from source to destination through the network. This queueing behaviour means that cells packets experience variations in the delay through a buffer and also if that delay becomes too large loss. At its simplest a buffer has a fixed service rate a finite capacity for the temporary storage of cells or packets awaiting service and a first-in-first-out FIFO service discipline. Even in this simple case the queueing behaviour depends on the type and mix of traffic being multiplexed through the buffer. So let s first look at the range of source models covered in the book and then we ll summarize the queueing analysis results. 16 TRAFFIC ISSUES AND SOLUTIONS Source models Model negative exponential distribution Use inter-arrival times service times for cells packets bursts flows calls Formula Pr inter-arrival time tg F t 1 e À f Parameters t - time X - rate of arrivals or rate of service Location Chapter 6 page 83 Model geometric distribution Use inter-arrival times service .
