H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/28
H04Q 3/00 (2006.01) H04L 12/56 (2006.01)
Patent
CA 2006393
A modular expandable digital single-stage switching network in ATM (Asynchronous Transfer Mode) technology for a fast packet-switched transmission of information, having a pre-switching module, a pre-switching being carried out only with respect to the matrix column, but not with respect to the matrix output, and the number of expansion inputs and the number of first outputs of the pre-switching module being 1/L, namely N, of that of the expansion module. The module contains a single FIFO which can read in 2N packets simultaneously and read out N packets simultaneously and, to avoid so-called packet overtaking, the chronological sequence of packets arriving in each case on one of the n first input lines of a pre-switching module is replaced from case to case by a spatial ordering on the N first output lines of the pre-switching module. A header information filter processes only a part of the header information of the data packets for switching the packets to the respective switching module column. In addition, there are provided for each matrix column a further pre-switching module and a final switching module, which carries out a final switching to the matrix output, the first outputs of said pre-switching modules being connected to the respective inputs of the final switching modules. The final switching modules have no expansion inputs and no expansion outputs. The header information filter of the final switching module processes another part of the header information for the final switching to a matrix output.
Hinterberger Christian
Horn Michael
Lobjinski Manfred
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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