Siemens Aktiengesellschaft

Christian Hinterberger

Michael Horn

Hans-Peter Huth

Christoph Beck

Manfred Lobjinski

Dirk Amandi

Oliver Von Soosten

The interworking of voice information in ATM cells is presently provided according to the standardizations of the ITU in the AAL1 adaption method. Specific properties of the voice information are taken into consideration therein. For interworking and transmission of other information data, further adaption methods such as, for example, the AAL5 method are provided. Here, the specific conditions of voice transmissions are not taken into consideration. In order to be able to implement the interworking and transmission of voice information according to the AAL5 standard as well, the AAL5 header is now inventively co-linked into the AAL5 information part of an ATM cell.

Method for transmitting voice information in ATM cells

In a module for processing ATM cells of a cell flow on virtual channels of a virtual path that is configured for the insertion of OAM-specific cells with an OAM cell generator, a cell filter and processing unit are provided to which the arriving cell stream is supplied. A connection data memory is provided in communication with the cell filter and processing unit. A scan unit is in communication with the connection data memory and to which a controller is allocated. An intermediate buffer has an input connected to the output of the OAM cell generator. A multiplexer is provided to which the output of the cell filter and processing unit as well as the output of the intermediate buffer is supplied.

Module for OAM processing of ATM cells of a cell flux on virtual connections

A method for monitoring at least one bit rate of at least one virtual connection, of a plurality of virtual connections, for which connection cells incoming on a transmission link are checked with respect to their temporal frequency. A temporal, average cell spacing of the incoming connection cells is provided according to an average bit rate of the at least one virtual connection and a bit rate on the transmission link. A central counter is clocked by a central counting clock and a counter value of the central counter is read at each of the incoming connection cells and the counter value that is connection-associated with the at least one virtual connection is stored. A counter value difference is formed from the stored counter value for the incoming connection cell and from the counter value that has been previously stored connection-associated with the at least one virtual connection for a previously arrived connection cell of the same virtual connection. A deviation is calculated of a respectively current cell spacing from the prescribed, average cell spacing for the respectively incoming connection cell using the counter value difference. A monitoring counter value is formed by summing the deviation of the cell spacing. A special handling of the virtual connection is implemented when the monitoring counter value transgress a first threshold value.

Method for monitoring a bit rate of at least one virtual connection

Modular expandable digital switching network in ATM (Asynchronous Transfer Mode) technology for a fast packet-switched transmission of information. The switching network has a J.times.J array of pre-switching modules and a 1.times.J array of final switching modules. The inputs of the switching network are connected to primary inputs of the pre-switching modules, whose outputs are connected to expansion inputs of pre-switching modules in the same column of the subsequent row. The outputs of the pre-switching modules in the final row with index J are connected to the inputs of the final switching modules in the same column, whose outputs are connected to the outputs of the switching network. Thus, a modular expandable switching network in ATM technology can be realized with minimal wiring requirements.

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Holzkirchen, Germany

Christian Hinterberger