Get Access to B-ISDN via PONs: ATM Communication in Practice PDF

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

The improvement of Passive Optical Networks (PONs) and ATM for broadband purposes at the moment provides the vanguard of telecommunications examine. This edited quantity, collating the services of overseas lecturers and researchers, describes the main complex verbal exchange platforms built on a multinational foundation. to begin with proposing the improvement of ATM and PONs applied sciences, the following is going on describe the advance of an entry community utilizing those innovations. Discussions comprise a huge variety of concerns from layered architectures, burst mode verbal exchange and synchronisation, to excessive pace encryption and trial description.

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

Sample text

Most cells with special header values are related to management actions. For example, the ATM Forum has assigned special VPI/VCI values to functions like meta-signalling, broadcast signalling, operation and maintenance (OAM) flows. The F4 flows, for example, exhibit a special VCI value and a VPI value identical to that of the virtual path to be controlled. F5 flows are used to control virtual channels. Therefore they have a VPI/VCI field identical to that of the virtual channel to be controlled; the indicator for the F5 flow is then found in the payload type (PT) field.

In the first case, the tagging of a cell consists in setting the CLP bit to 1, thus transforming it into a low priority cell. Two scenarios are possible (see [1]) for deciding on whether to allow a cell (be it low- or high-priority) to pass, to be marked or discarded. , is respecting the agreed traffic contract). Any cells that are 46 USAGE PARAMETER CONTROL found to be non-conforming will be discarded. , the CLP = 0 + 1 stream). , low-priority traffic). The second conformance test will again discard any cells (irrespective of their CLP bit value) that do not respect the agreed traffic contract.

Instead, some problems of call control will be highlighted which are specific to ATM networks and have no counterpart in conventional networks. To understand the problems involved, a quick review will be given of what resource allocation means for an ISDN network. e. the address) of the desired communication partner "B". Usually, one 64 kbit/ s channel is necessary to establish the connection. In the network, routing tables are kept which describe a preferred (and an alternative) way from" A" to "B".

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