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By Marco Conti

With the ongoing good fortune of neighborhood sector Networks (IANs), there's an expanding call for to increase their services in the direction of greater facts charges and wider parts. This, including the growth in fiber-optic know-how, has given upward thrust to the so-called Metropolitan sector Networks (MANs). MANs can span a lot larger distances than present LAN s, and provide facts charges at the order of countless numbers of Megabits/sec (Mbps). The luck of MANs is especially because of the chance they supply to improve new networking items in a position to delivering high-speed commu­ nications among functions at aggressive costs, which still supply an enough go back at the brands' investments. a significant factor in of applicable networking criteria. reaching this aim is the provision Fiber disbursed information Interface (FDDl) and allotted Queue twin Bus (DQDB) are the 2 typical applied sciences for MANs for which commercial items are already on hand. therefore, this e-book focuses in general on those criteria. these days there are numerous books facing MANs, and those glance ordinarily at FDDI (e.g., [2], [92], [118], [141]). those books concentration totally on the architectures and protocols, while they pay little cognizance to in line with­ formance research. end result of the strength of MANs to combine companies, a quantitative research of the standard of carrier (QoS) supplied via those tech­ nologies is a correct factor, and is hence lined intensive during this book.

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1 is called the service rate. 1 can be defined as the rate at which a server processes packets when the server is busy. This definition is valid for all service time distributions. 1 For some models which come up in the networking environment, it is necessary to make a distinction between different types of packets. For example, the protocol-data-units moving along a connection Metropolitan Area Networks 25 can be classified according to whether or not they carry a user message. If they do not, protocol-data-units are used to control the operation of the connection to which they belong.

In the models belonging to the second class there are periods when packets are present but none of them can be served (vacation models). In the following, if not explicitly stated, the models are assumed without vacation. As stated before, to fully specify these models it is necessary to describe the arrival process, the service process, the number and service rate of the servers, and the order in which packets are served. For queueing models with vacation, it is also necessary to specify the rules which govern when vacation periods begin and end.

The main result can now be stated. 3 If the lAA holds, the fraction of arrivals which see the process in a given state is equal to the fraction of time the process is in that state. , "Poisson Arrivals See Time Averages". , the fraction of time a process spends in a given state. The PASTA property holds both for finite t and for limiting averages. The general proof of PASTA [163] is quite complex and will be omitted. The proof for finite t is presented below, since it is straightforward and highlights the need for the LAA assumption.

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