Download Access to B-ISDN via PONs: ATM Communication in Practice by Ulrich Killat (auth.), Ulrich Killat (eds.) PDF

By Ulrich Killat (auth.), Ulrich Killat (eds.)

The improvement of Passive Optical Networks (PONs) and ATM for broadband functions presently offers the forefront of telecommunications study. This edited quantity, collating the services of overseas lecturers and researchers, describes the main complicated verbal exchange structures constructed on a multinational foundation. to begin with providing the advance of ATM and PONs applied sciences, the subsequent is going on describe the improvement of an entry community utilizing those thoughts. Discussions contain a huge diversity of matters from layered architectures, burst mode verbal exchange and synchronisation, to excessive velocity encryption and trial description.

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Extra resources for Access to B-ISDN via PONs: ATM Communication in Practice

Sample text

The buffers are read at a rate determined by the shaping process. Although this process can reduce the clumping, it does so at the expense of delaying the traffic generated by the source; thus, it is a process that can only be tolerated by non-delay-sensitive traffic. 3 ATM Forum vs. ITU Recently, both the ITU and the ATM Forum have been addressing the subject of policing. The policing algorithm used by the ITU (see [1]), ATM FORUM VS. ITU 45 known as the continuous-state leaky bucket algorithm (CSLB), uses two parameters: the peak emission interval T (which is the inverse of the peak cell rate of an ATM connection) and the CDV tolerance tau.

Neural Networks, 1, (1), 122-30, March 1990 [7] Castelli P, Cavallero E and Tonietti A, Policing and call admission problems in ATM networks, ITC-13, 847-852 1991. 6 USAGE PARAMETER CONTROL According to ITU Rec. 371 (see [1]); usage parameter control (UPC) "is the set of actions taken by the network to monitor and control traffic, in terms of traffic offered and validity of the ATM connection at the user access network". In other words, after a connection is accepted by the network using a connection admission control (CAC) procedure, it must be ensured that network resources are protected from malicious or unintentional misbehaviour of the source producing the call, which can affect the quality of service (Q05) of other calls already established in the network.

The Gaussian approximation is a very simple method. However, there are two weak points worth noting. 1. 2. 2 The method assumes a Gaussian distribution for the aggregate traffic; this only makes sense when there is a great number of connections present in the system or when the individual connections follow a Gaussian distribution. e. it is assumed that all connections have the same cell loss requirements. Convolution method The convolution method relies on knowledge of the distributions of the random variables representing the instantaneous rates of the individual connections.

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