Improvements in or relating to an atm switch

Details Improvements in or relating to an atm switch Improvements in or relating to an atm switch

H - Electricity

04

L

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

Patent

CA 2235135

An ATM routing switch for bidirectional transmission of at least two types of cell (61), one type accepting variable bit rate of transmission and a second type accepting some loss of cells in transmission, includes first reserve buffer capacity (160) for cells of the first type, a second reserve buffer capacity (150) for cells of said second type and control circuitry (39, 40, 41) for generating a flow control signal (FCT) if a predetermined threshold for the first buffer capacity (160) is reached by input of cells of said first type, and discarding input cells of said second type if a predetermined threshold for said second buffer capacity (150) has been reached by input of cells of said second type.

Commutation d'acheminement MTA assurant la transmission bidirectionnelle d'au moins deux types de cellule (61), le premier type acceptant un débit binaire variable de transmission et le deuxième type acceptant la perte de quelques cellules pendant la transmission. Le commutateur d'acheminement comprend une première capacité (160) de tampon de réserve pour les cellules du premier type, une deuxième capacité (150) de tampon de réserve pour les cellules du deuxième type et un circuit (39, 40, 41) de commande qui sert à générer un signal de commande d'écoulement (SCE) si un seuil prédéterminé pour la première capacité (160) tampon est atteint par l'entrée de cellules du premier type, et à rejeter l'entrée de cellules du deuxième type si un seuil prédéterminé pour la deuxième capacité (150) de tampon a été atteint par l'entrée de cellules du deuxième type.

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