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 2235287

A network (20) of ATM routing switches (21) transmits digital signal cells of a first type requiring integrity of transmission and a second type accepting some loss in transmission, each switch has buffer circuitry (35), a plurality of output ports (30) each having a plurality of queues of cells awaiting output, each output port having control circuitry (40) to provide in an output frame control bits (60, 62) indicating the type of cell, a path identifier and the existence of flow congestion at the routing switch (21) which is outputting the frame, thereby inhibiting transmission of further frames to that location until a frame is received from that location indicating that the congestion is cleared.

Un réseau (20) de commutateurs (21) d'acheminement MTA transmet des cellules de signaux numériques d'un premier type nécessitant l'intégrité de la transmission et d'un deuxième type acceptant une certaine perte de la transmission. Chaque commutateur comporte un circuit tampon (35), une pluralité de ports de sortie (30) qui ont chacun une pluralité de files d'attente de cellules attendant une sortie, chaque port de sortie comprenant un circuit de commande (40) qui génère dans une séquence de sortie des bits de commande (60, 62) qui indiquent le type de cellule, un identification de voie et l'existence d'un encombrement de l'écoulement au niveau du commutateur d'acheminement (21) qui donne la séquence en sortie, ce système empêchant la transmission d'autres séquences jusqu'à cet endroit jusqu'à ce qu'une séquence reçue en provence de cet endroit indique que l'encombrement est terminé.

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