Stochastic Modeling

Download Modeling and Analysis of Computer Communications Networks by Jeremiah F. Hayes (auth.) PDF

By Jeremiah F. Hayes (auth.)

In huge degree the normal hindrance of communications engineers has been the conveyance of voice signs. the main trendy instance is the phone community, within which the innovations used for transmission multiplex­ ing and switching were designed for voice indications. notwithstanding, one of many many results of desktops has been the starting to be quantity of one of these site visitors that flows in networks composed of person terminals, processors, and peripherals. The features of this knowledge site visitors and the linked perfor­ mance necessities are fairly diverse from these of voice site visitors. those modifications, coupled with burgeoning electronic expertise, have engendered a complete new set of techniques to multiplexing and switching this site visitors. the hot innovations are the province of what has been loosely known as desktop communications networks. the topic of this publication is the mathematical modeling and research of desktop communications networks, that's to assert, the multiplexing and switching recommendations which were constructed for facts site visitors. the foundation for plenty of of the versions that we will think about is queueing idea, even though a few different disciplines are drawn on besides. the extent at which this fabric is roofed is that of a first-year graduate path. it's assumed that on the outset the scholar has had an excellent undergraduate direction in likelihood and random techniques of the type which are an increasing number of universal between electric engineering and computing device technology departments.

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Extra info for Modeling and Analysis of Computer Communications Networks

Example text

Transients in switching cause impulse noise. Finally, as in any physical circuit, there is thermal noise. With respect to this last impairment, it turns out that the telephone channel is relatively quiet and the other impairments have a greater effect on performance. The cumulative effect of these impairments has been to limit the speed and performance of voiceband data transmission. In commercial systems, the traditional upper limit on speed has been 9600 bps. The standard of performance is stated as a probability of bit error of 10- 5 • This figure gives an incomplete picture since errors tend to cluster in time and on a subset of poor circuits.

Data Transmission In this section we summarize the techniques that are used to transmit data over both the baseband and the voiceband channels. t In terms of an OSI system of protocols, the techniques used to transmit data are classified in the physical level. " In the case of baseband transmission this is something of a misnomer, since modulation and demodulation are not involved. The proper term for both bands is data set. 1. , the power density spectrum of the signal extends from dc to higher frequencies.

22. A. Joel, Electronic Switching: Central Office Systems of the World, IEEE Press, New York (1976). 23. Digital Switching, Special Issue of IEEE Transactions on Communications, Com. 27(7), July (1979). 24. R. W. Lucky, J. Salz, and E. J. , Principles of Data Communication, McGraw-Hill, New York (1968). 25. W. R. Bennett and J. R. Davy, Data Transmission, McGraw-Hill, New York (1965). 26. J. G. Proakis, Digital Communications, McGraw-Hill, New York (1983). 27. N. Q.

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