Flow control for switching

H - Electricity – 04 – L

Patent

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Details

H04L 12/56 (2006.01) H04L 29/02 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2229831

A method and a device for, preferably in ATM-traffic and in a switch (1) with input and output buffers (31-33 and 11-13) and with a so-called "credit based solution" for flow control, using a very short time interval between the requests from the input ports (2-4) to send cells (51) through the switch core (8) to the output ports (5-7) and where the degree of fullness of the output buffers is accurately supervised and taken into the calculations together with the number of cells in the input buffers when determined how many cells should be allowed to be sent to each output port (5-7) during the next time interval. A certain over-allocation of cells to each output port is permitted.

Méthode et dispositif conçus de préférence pour le trafic ATM et pour un commutateur (1) à mémoires tampons d'entrée et de sortie (31-33 et 11-13) avec contrôle de flux selon la « méthode des crédits », et utilisant un intervalle de temps très court entre les demandes des ports d'entrée (2-4) pour l'envoi de cellules (51) par l'intermédiaire du bloc commutateur (8) vers les ports de sortie (5-7), le degré de remplissage des tampons de sortie étant exactement supervisé et pris en compte dans les calculs, conjointement avec le nombre de cellules des tampons d'entrée, au moment de fixer le nombre de cellules transmissibles à chaque port de sortie (5-7) pendant le prochain intervalle de temps. Une certaine suraffectation de cellules à chaque port de sortie est permise.

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