Metropolitan Area Networks by Marco Conti

By Marco Conti

With the continued luck of neighborhood region Networks (IANs), there's an expanding call for to increase their functions in the direction of better info charges and wider components. This, including the development in fiber-optic know-how, has given upward push to the so-called Metropolitan region Networks (MANs). MANs can span a lot better distances than present LAN s, and supply facts premiums at the order of enormous quantities of Megabits/sec (Mbps). The luck of MANs is principally as a result of chance they supply to strengthen new networking items able to delivering high-speed commu­ nications among functions at aggressive costs, which still supply an enough go back at the brands' investments. a significant component in of applicable networking criteria. attaining this objective is the supply Fiber dispensed info Interface (FDDl) and dispensed Queue twin Bus (DQDB) are the 2 common applied sciences for MANs for which business items are already on hand. hence, this ebook focuses almost always on those criteria. these days there are numerous books facing MANs, and those glance usually at FDDI (e.g., [2], [92], [118], [141]). those books concentration totally on the architectures and protocols, while they pay little awareness to consistent with­ formance research. because of the potential of MANs to combine prone, a quantitative research of the standard of carrier (QoS) supplied via those tech­ nologies is a proper factor, and is therefore lined extensive during this book.

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Extra resources for Metropolitan Area Networks

Sample text

V. Ik denotes the generic intervisit length. The service period of Qk is the time interval in which the server is serving packets at Qk during a given cycle. v. SPk denotes the generic service period. 22). L Ak . b K E [C] . k = E [C] . 24) The methodologies presented in this book for the analysis of a polling system assume that the system operates in a steady state. Studying stability criteria for multidimensional Markov chains is very difficult [71]. Stability criteria for polling systems have been derived (without a formal proof) by Kuehn [102].

Chapter 4 outlines recent results on polling systems with limited service disciplines. It includes analytical methods based on the pseudo-conservation law, and two numerical algorithms proposed by Tran-Gia & Raith and Blanc. The power series algorithm developed by Blanc not only provides solutions for this class of models, but can also be applied to study stochastic processes with a Quasi-birth-and-death (QBD) structure. Chapter 5 describes the FDDI standard. The main focus is on the MAC protocol.

13) it is assumed that the queueing system reaches the steady-state condition. 4 also apply in the context of queueing systems. b . 14) In single queue models with c servers and an infinite buffer the condition ( aLI c) < 1 is necessary for system stability [99]. Unless explicitly stated the condition (aLI c) < 1 is assumed to hold. Under this hypothesis a L coincides with the average number of busy servers and (aLI c) is the probability of a server being busy. (aLI c) is commonly referred to as utilization factor and denoted with p.

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