A cell switch and a method for routing cells therethrough

H - Electricity – 04 – L

Patent

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Details

H04L 12/56 (2006.01)

Patent

CA 2163342

A cell switch comprises a plurality of switch ports, each one connected to a number of user terminals, for sending and receiving cells of the user terminals, which cells contain payload and addressing information. A switch core interconnects the switch ports for enabling communication between them. Tagging means are provided in the switch ports for creating, based upon the addressing information of a cell received from a user terminal, a tag belonging to the cell and containing routing information enabling routing of the cell through the switch core. Means are provided for sending tags to the switch core in advance of corresponding cells, one tag for each cell. Scheduling means in the switch core receive the tags sent in advance and create, based upon the routing information included therein, scheduling information regarding sending times of the respective cells from the switch ports for scheduling such that during these sending times the cells can be sent to the destination ports without conflict arising with other cells. The scheduling information is sent to the switch ports of origin of the cells, and the cells are retained in the switch ports until their respective scheduled sending times appear.

Central de commutation intercellulaire comportant une série de ports (2.n) reliés individuellement à plusieurs postes d'abonnés pour y diriger ou en recevoir les messages des cellules des postes d'abonnés, lesdits messages contenant des informations de trafic et d'adressage. Le central (4) interconnecte lesdits ports pour établir des communications entre eux. Les ports du central sont munis de moyens d'identification permettant de créer sur la base de l'information d'adresse d'une cellule (17) reçue d'un poste d'abonné un indicateur (14) propre à la cellule et contenant des informations d'acheminement permettant d'atteindre une cellule par l'intermédiaire du central. Sont également prévus des moyens permettant de faire parvenir des indicateurs au central avant de les envoyer aux cellules à raison d'un indicateur par cellule. Des moyens de synchronisation inclus dans le central reçoivent les indicateurs envoyés en avance et créent sur la base des informations d'acheminement qu'ils contiennent des informations de synchronisation relatives aux temps d'émission entre les ports du central et leurs cellules respectives, afin d'assurer une synchronisation telle que pendant ces temps tout conflit entre cellules soit évité. Les informations de synchronisation sont transmises aux ports (du central) d'origine des cellules et les messages provenant des cellules sont retenues dans les ports du central jusqu'au moment de leur intervalle programmé d'émission.

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