U.S. Philips Corporation

Lucent Technologies Inc.

Hans-Georg Keller

Peter Nagel

Wolfgang Kowalk

Karl Honig

A transmission system comprises a plurality of network nodes which for receiving and transmitting packets which contain connection-related status information about the transmission system. A network node comprises at least one evaluation unit which stores status information extracted from a packet in a table. Furthermore, irrespective of the order of the received packets, the evaluation unit determines current, connection-related statuses in a given order for each connection, based upon the statuses also stored in the table and determined thus far, as well as on the received connection-related status information signals.

Transmission system with line status determination independent of

The invention relates to a transmission system for transmitting and detecting the beginning of the frame of a frame synchronized signal, which comprises a first and a second detection circuit (1, 2) and an evaluation circuit (3). The first detection circuit (1) is provided for setting a first detection signal (D1) to a first state upon detection of a first bit sequence located at the beginning of the frame of the signal, and the second detection circuit (2) for setting a second detection signal (D2) to a first state upon detection of a second bit sequence located at a specific frame position of the signal. The evaluation circuit (3) comprises a frame counter (10) which is provided at least during the detection of the beginning of the frame, for resetting the first detection signal (D1) to an initial value after the first state has occurred, and a combining circuit (15) for forming a frame state signal (R) which has a first state only when the first state of the first detection signal (D1) occurs during the initial value, and the first state of the second detection signal (D2) occurs during a specific frame value of the frame counter (10).

Transmission system for transmitting and detecting the beginning of the

The invention relates to an asynchronous time-division multiplex transmission system comprising an interconnection element, which element transmits cells supplied by auxiliary lines (6) and destined for a trunk line (8) at a preset interconnection element transmission rate and which comprises cell filters (7) coupled to each of the auxiliary lines, which filters pass the cells for storage in intersection buffers (15) coupled to each cell filter when the path identification contained in the cells is allocated to the trunk line. An output buffer (17) supplying cells to the trunk line is connected to the outputs of the intersection buffers. The cells are transmitted between the intersection buffers and the output buffer at a temporary transmission rate which is increased relative to the element transmission rate.

Interconnection element for an asynchronous time-division multiplex

An interconnection element for an asynchronous time-division multiplex transmission system which transmits cells supplied by auxiliary lines (14a to 14d) and destined for a trunk line (10). The element comprises cell filters (11a to 11d) coupled each to an auxiliary line. The filters pass the cells to be stored in intersection buffers (12a to 12d) coupled to each cell filter when the path identification is allocated to the trunk line for controlling the reading of the cells from the intersection buffers onto the trunk line the system includes allocation circuit comprises a chain of hierarchically structured allocation elements (13a to 13d) associated each to an intersection buffer and having each its control buffer (17a to 17d). When a cell is stored in the associated intersection buffer each allocation element stores a first status in the associated control buffer and the hierarchically lower allocation element a second status in the associated control buffers. In reverse hierarchical order each allocation element evaluates the associated control buffer and releases, when a first status is available, the allocated intersection buffer for a cell to be read out.

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Nurnberg, Germany

Hans-Georg Keller