Alcatel N.v.

Michel P De Somer

Bart J Pauwels

Michel A Henrion

Henri A Verhille

A cell resequencing system is provided for a resequencing section (RS) of a telecommunication network through which cells of communications are transmitted. The resequencing section includes cell switching networks (SN2) having inlets (I2l/I2n/I2N) coupled to inputs (S1l/S1n/S1N) and outlets (N2l/N2m/N2M). The cells are subjected to a first variable time delay. The cell resequencing system (C1l/C1n/C1N, CK1; R2l/R2m/R2M, CK2) includes latches (R2l/R2m/R2M) coupled between the outlets (N2l/N2m/N2M) and the outputs (S2l/S2m/S2M) to subject the cells to a second variable time delay chosen for each cell so the sum of the first and second variable time delay is substantially equal to a predetermined constant time value, which determines the size of the latches (R2l/R2m/R2M). The resequencing section (RS) has two inputs (S1l, S1n/S1N) each coupled to a distinct inlet (I2l/I2n/I2 N) via a distinct transmission link (TLl/TLn/TLN). The cells are subjected to at least a fixed transfer delay (TD) during their transfer from the input (S1l/S1n/S1N) to the outlet (N2l/N2m/N2M). The fixed transfer delay forms part of the first variable time delay. The minimum size of the latches (R2l/R2m/R2M) is determined by a difference between a predetermined constant time value and the fixed transfer delay (TD).

Cell resequencing system for a telecommunication network

A telecommunication system for transmitting cells through switching nodes (N1-3) interconnected by groups (LG12, LG23) of transmission links, each node including an asynchronous switching network (SN1-3) which comprises several switch elements. At least one of these switch elements possesses a routing group possibility whereby the cells are distributed over its outlets and so further over the different transmission links of the link group to which the switching network is connected. This distribution is performed in function of a self-routing tag which is derived from external routing data associated with the cell. At the input ports of either each or only the first switching network (SN1) of the system, the external routing data is translated in a self-routing tag which is for instance added to the header of the cell, while at the output ports of each or of only the last switching network (SN3) of the system respectively, the self-routing tag is removed from this header. Some switch elements possess a multicast possibility whereby the cells are transferred to several outlets thereof and thereby to several link groups to which the switching network is connected.

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Kontich, Belgium

Michel P De Somer