Siemens Aktiengesellschaft

Roke Manor Research Limited

Thomas Worster

Wolfgang Fischer

Simon Paul Davis

Andrew Timothy Hayter

Eugen B Wallmeier

Ian B Stewart

An ATM communication system has an ATM switch having a plurality of input ports and a plurality of output ports, each of the input ports being fed from an input port server and each of the output ports being arranged to feed an output port server. The input port servers each have a plurality of buffer stores, one for each of the output ports to which output port data is transmitted through the switch. Each buffer store in the input port servers is arranged to interrogate the output port server with which it communicates by a bandwidth request before the transmission of data. This determines whether output port server data handling capacity is available, whereby ATM switch operation during periods of peak traffic is facilitated. The system includes a queuing arrangement for bandwidth requests received during periods when there is no available bandwidth capacity, the arrangement being such that requests are released in a predetermined order when capacity becomes available.

ATM communication system with interrogation of output port servers for

A modified leaky-bucket method for a message transmission system wherein a message cell stream is asynchronously transmitted, this message cell stream carrying message cells for a plurality of virtual connections with a broad range of possible message cell rates, the message cell rate for every virtual connection is being monitored and limited according to a leaky-bucket method, the shortest allowable, timing between two message cells belonging to the same virtual connection being represented by the quotient of two numbers.

Modified leaky bucket method

An ATM signal processor system for processing ATM data cells which in combination define a data package wherein the last cell of a package is characterized by an identifying code. The cells of different data packages are multiplexed to provide a serial data stream. A server and a buffer store via which the server is fed with the serial data stream are provided. The buffer store has a threshold capacity beyond which cells are discarded. A discarded cell identifier/rejecter serves to identify and store the identity of a data package with which a discarded cell is associated so as to be set thereafter to reject subsequently received cells with the same data package identity until being reset upon receipt of the last cell of the package as indicated by its characteristic identifying code.

ATM signal processors

A method for a transmission line via which message cells of a plurality of virtual connections having separately defined transmission bit rates asynchronously transmitted, wherein, depending on the transmission bit rate declared for a connection and depending on the chronological spacing of message cells belonging to the same connection that are intended for forwarding, a time slot in which a message cell is to be forwarded is identified for every message cell, whereby a message cell--depending on the length of the time slot calculated for it--either is discarded or is stored for forwarding in the respective, calculated or in a following time slot.

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Munich, Germany

Thomas Worster