tailieunhanh - Giới thiệu về IP và ATM - Thiết kế và hiệu suất P1

This chapter is intended as a brief introduction to the technologies of the Asynchronous Transfer Mode (ATM) and the Internet Protocol (IP) on the assumption that you will need some background information before proceeding to the chapters on traffic engineering and design. If you already have a good working knowledge you may wish to skip this chapter, because we highlight the fundamental operation as it relates to performance issues rather | 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 PARTI Introductory Topics 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 An Introduction J to the Technologies of IP and ATM the bare necessities This chapter is intended as a brief introduction to the technologies of the Asynchronous Transfer Mode ATM and the Internet Protocol IP on the assumption that you will need some background information before proceeding to the chapters on traffic engineering and design. If you already have a good working knowledge you may wish to skip this chapter because we highlight the fundamental operation as it relates to performance issues rather than describe the technologies and standards in detail. For anyone wanting a deeper insight we refer to for a comprehensive introduction to the narrowband Integrated Services Digital Network ISDN to for a general introduction to ATM including its implications for interworking and evolution and to for next-generation IP. CIRCUIT SWITCHING In traditional analogue circuit switching a call is set-up on the basis that it receives a path from source to destination that is its property for the duration of the call . the whole of the bandwidth of the circuit is available to the calling parties for the whole of the call. In a digital circuit-switched system the whole bit-rate of the line is assigned to a call for only a single time slot per frame. This is called time division multiplexing . During the time period of a frame the transmitting party will generate a fixed number of bits of digital data for example 8 bits to represent 4 AN INTRODUCTION TO THE TECHNOLOGIES OF IP AND ATM the level of an analogue telephony .