Scheduling means for data switching apparatus

Details Scheduling means for data switching apparatus Scheduling means for data switching apparatus

H - Electricity

04

L

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

Patent

CA 2319822

Scheduling means is provided for data switching apparatus having a plurality of input ports and a plurality of output ports between which data having one of a predetermined number of priority levels is to be passed. The scheduling means includes a first pipeline stage (10) to which are applied requests for said interconnections from the input ports and operable to satisfy at least some of the requested interconnections. A priority mixer (13) is provided to which are applied those requests for interconnections which were not satisfied by the first pipeline stage together with requests of a different priority level. The priority mixer (13) operates to select which of those requests should be further considered and applied to a second pipeline stage (11). This is operable to satisfy such of those requests as are possible. Further pipeline stages (12) are provided, to which are applied those requests not satisfied by any preceding pipeline stages.

On décrit un dispositif d'ordonnancement destiné à un système de commutation de données présentant plusieurs bornes d'entrée et plusieurs bornes de sortie entre lesquelles doivent être passées des données ayant un niveau de priorité préétabli parmi plusieurs. Le dispositif d'ordonnancement inclut un premier étage pipeline (10) qui reçoit des demandes d'interconnexion depuis les bornes d'entrée et se met en oeuvre pour satisfaire au moins quelques-unes des interconnexions demandées. Un mélangeur de priorités (13) reçoit, en même temps que des demandes d'un niveau de priorité différent, celles des demandes d'interconnexion qui non pas été satisfaites par le premier étage pipeline. Le mélangeur de priorités (13) sélectionne les demandes qui doivent être reprises et adressées à un deuxième étage pipeline (11). Cette procédure permet de satisfaire autant de demandes que possible. On décrit d'autres étages pipelines qui reçoivent les demandes non satisfaites par un étage pipeline précédent.

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